Thrift-RPC client in Flume

Get RpcClient from RpcClientFactory with Reflection programming

Message or Event definition in Flum

public interface Event {

  /**
   * Returns a map of name-value pairs describing the data stored in the body.
   */
  public Map<String, String> getHeaders();

  /**
   * Set the event headers
   * @param headers Map of headers to replace the current headers.
   */
  public void setHeaders(Map<String, String> headers);

  /**
   * Returns the raw byte array of the data contained in this event.
   */
  public byte[] getBody();

  /**
   * Sets the raw byte array of the data contained in this event.
   * @param body The data.
   */
  public void setBody(byte[] body);

}

/**
 * Factory class to construct Flume {@link RPCClient} implementations.
 */
public class RpcClientFactory {

  @SuppressWarnings("unchecked")
  public static RpcClient getInstance(Properties properties)
      throws FlumeException {
    String type = null;
    type = properties.getProperty(
        RpcClientConfigurationConstants.CONFIG_CLIENT_TYPE);
    if (type == null || type.isEmpty()) {
      type = ClientType.DEFAULT.getClientClassName();
    }
    Class<? extends AbstractRpcClient> clazz;
    AbstractRpcClient client;
    try {
      String clientClassType = type;
      ClientType clientType = null;
      try {
        clientType = ClientType.valueOf(type.toUpperCase(Locale.ENGLISH));
      } catch (IllegalArgumentException e) {
        clientType = ClientType.OTHER;
      }
      if (!clientType.equals(ClientType.OTHER)) {
        clientClassType = clientType.getClientClassName();
      }
      clazz =
          (Class<? extends AbstractRpcClient>) Class.forName(clientClassType);
    } catch (ClassNotFoundException e) {
      throw new FlumeException("No such client!", e);
    }

    try {
      client = clazz.newInstance();
    } catch (InstantiationException e) {
      throw new FlumeException("Cannot instantiate client. " +
          "Exception follows:", e);
    } catch (IllegalAccessException e) {
      throw new FlumeException("Cannot instantiate client. " +
          "Exception follows:", e);
    }
    client.configure(properties);
    return client;

  }

  public static RpcClient getThriftInstance(String hostname, Integer port, Integer batchSize) {
    if (hostname == null) {
      throw new NullPointerException("hostname must not be null");
    }
    if (port == null) {
      throw new NullPointerException("port must not be null");
    }
    if (batchSize == null) {
      throw new NullPointerException("batchSize must not be null");
    }

    Properties props = new Properties();
    props.setProperty(RpcClientConfigurationConstants.CONFIG_HOSTS, "h1");
    props.setProperty(RpcClientConfigurationConstants.CONFIG_HOSTS_PREFIX + "h1",
        hostname + ":" + port.intValue());
    props.setProperty(RpcClientConfigurationConstants.CONFIG_BATCH_SIZE, batchSize.toString());
    ThriftRpcClient client = new ThriftRpcClient();
    client.configure(props);
    return client;
  }

  public static RpcClient getThriftInstance(String hostname, Integer port) {
    return getThriftInstance(hostname, port, RpcClientConfigurationConstants
      .DEFAULT_BATCH_SIZE);
  }

  public static RpcClient getThriftInstance(Properties props) {
    props.setProperty(RpcClientConfigurationConstants.CONFIG_CLIENT_TYPE,
                      ClientType.THRIFT.clientClassName);
    return getInstance(props);
  }

  public static enum ClientType {
    OTHER(null),
    DEFAULT(NettyAvroRpcClient.class.getCanonicalName()),
    DEFAULT_FAILOVER(FailoverRpcClient.class.getCanonicalName()),
    DEFAULT_LOADBALANCE(LoadBalancingRpcClient.class.getCanonicalName()),
    THRIFT(ThriftRpcClient.class.getCanonicalName());

    private final String clientClassName;

    private ClientType(String className) {
      this.clientClassName = className;
    }

    protected String getClientClassName() {
      return this.clientClassName;
    }

  }
}

Define ThriftRpcClient implementing RpcClient

public class ThriftRpcClient extends AbstractRpcClient {
  private ConnectionPoolManager connectionManager;
  private final ExecutorService callTimeoutPool;
  private final AtomicLong threadCounter;
  private final Random random = new Random();
  private String protocol;

  private boolean enableSsl;
  private String truststore;
  private String truststorePassword;
  private String truststoreType;
  private final List<String> excludeProtocols = new LinkedList<String>();

  public ThriftRpcClient() {
    stateLock = new ReentrantLock(true);
    connState = State.INIT;
    threadCounter = new AtomicLong(0);
    callTimeoutPool = Executors.newCachedThreadPool(new ThreadFactory() {
      @Override
      public Thread newThread(Runnable r) {
        Thread t = new Thread(r);
        t.setName("Flume Thrift RPC thread - " + String.valueOf(threadCounter.incrementAndGet()));
        return t;
      }
    });
  }

  @Override
  public void append(Event event) throws EventDeliveryException {
    ClientWrapper client = null;
    boolean destroyedClient = false;
    try {
      if (!isActive()) {
        throw new EventDeliveryException("Client was closed due to error. " +
            "Please create a new client");
      }
      client = connectionManager.checkout();
      final ThriftFlumeEvent thriftEvent = new ThriftFlumeEvent(event.getHeaders(), ByteBuffer.wrap(event.getBody()));
      doAppend(client, thriftEvent).get(requestTimeout, TimeUnit.MILLISECONDS);
    } catch (Throwable e) {
      if (e instanceof ExecutionException) {
        Throwable cause = e.getCause();
        if (cause instanceof EventDeliveryException) {
          throw (EventDeliveryException) cause;
        } else if (cause instanceof TimeoutException) {
          throw new EventDeliveryException("Append call timeout", cause);
        }
      }
      destroyedClient = true;
      // If destroy throws, we still don't want to reuse the client, so mark it
      // as destroyed before we actually do.
      if (client != null) {
        connectionManager.destroy(client);
      }
      if (e instanceof Error) {
        throw (Error) e;
      } else if (e instanceof RuntimeException) {
        throw (RuntimeException) e;
      }
      throw new EventDeliveryException("Failed to send event. ", e);
    } finally {
      if (client != null && !destroyedClient) {
        connectionManager.checkIn(client);
      }
    }
  }

  private Future<Void> doAppend(final ClientWrapper client,
                                final ThriftFlumeEvent e) throws Exception {

    return callTimeoutPool.submit(new Callable<Void>() {
      @Override
      public Void call() throws Exception {
        Status status = client.client.append(e);
        if (status != Status.OK) {
          throw new EventDeliveryException("Failed to deliver events. Server " +
              "returned status : " + status.name());
        }
        return null;
      }
    });
  }

  private Future<Void> doAppendBatch(final ClientWrapper client,
                                     final List<ThriftFlumeEvent> e) throws Exception {
    return callTimeoutPool.submit(new Callable<Void>() {
      @Override
      public Void call() throws Exception {
        Status status = client.client.appendBatch(e);
        if (status != Status.OK) {
          throw new EventDeliveryException("Failed to deliver events. Server " +
              "returned status : " + status.name());
        }
        return null;
      }
    });
  }

  @Override
  public boolean isActive() {
    stateLock.lock();
    try {
      return (connState == State.READY);
    } finally {
      stateLock.unlock();
    }
  }
  /**
   * Wrapper around a client and transport, so we can clean up when this
   * client gets closed.
   */
  private class ClientWrapper {
    public final ThriftSourceProtocol.Client client;
    public final TTransport transport;
    private final int hashCode;

    public ClientWrapper() throws Exception {
      TSocket tsocket;
      if (enableSsl) {
        // JDK6's factory doesn't appear to pass the protocol onto the Socket
        // properly so we have to do some magic to make sure that happens.
        // Not an issue in JDK7 Lifted from thrift-0.9.1 to make the SSLContext
        SSLContext sslContext = createSSLContext(truststore, truststorePassword,
            truststoreType);

        // Create the factory from it
        SSLSocketFactory sslSockFactory = sslContext.getSocketFactory();

        // Create the TSocket from that
        tsocket = createSSLSocket(
            sslSockFactory, hostname, port, 120000, excludeProtocols);
      } else {
        tsocket = new TSocket(hostname, port);
      }

      transport = getTransport(tsocket);

      // The transport is already open for SSL as part of TSSLTransportFactory.getClientSocket
      if (!transport.isOpen()) {
        transport.open();
      }
      if (protocol.equals(BINARY_PROTOCOL)) {
        LOGGER.info("Using TBinaryProtocol");
        client = new ThriftSourceProtocol.Client(new TBinaryProtocol(transport));
      } else {
        LOGGER.info("Using TCompactProtocol");
        client = new ThriftSourceProtocol.Client(new TCompactProtocol(transport));
      }
      // Not a great hash code, but since this class is immutable and there
      // is at most one instance of the components of this class,
      // this works fine [If the objects are equal, hash code is the same]
      hashCode = random.nextInt();
    }

    public boolean equals(Object o) {
      if (o == null) {
        return false;
      }
      // Since there is only one wrapper with any given client,
      // direct comparison is good enough.
      if (this == o) {
        return true;
      }
      return false;
    }

    public int hashCode() {
      return hashCode;
    }
  }

  private class ConnectionPoolManager {
    private final Queue<ClientWrapper> availableClients;
    private final Set<ClientWrapper> checkedOutClients;
    private final int maxPoolSize;
    private int currentPoolSize;
    private final Lock poolLock;
    private final Condition availableClientsCondition;

    public ConnectionPoolManager(int poolSize) {
      this.maxPoolSize = poolSize;
      availableClients = new LinkedList<ClientWrapper>();
      checkedOutClients = new HashSet<ClientWrapper>();
      poolLock = new ReentrantLock();
      availableClientsCondition = poolLock.newCondition();
      currentPoolSize = 0;
    }

    public ClientWrapper checkout() throws Exception {

      ClientWrapper ret = null;
      poolLock.lock();
      try {
        if (availableClients.isEmpty() && currentPoolSize < maxPoolSize) {
          ret = new ClientWrapper();
          currentPoolSize++;
          checkedOutClients.add(ret);
          return ret;
        }
        while (availableClients.isEmpty()) {
          availableClientsCondition.await();
        }
        ret = availableClients.poll();
        checkedOutClients.add(ret);
      } finally {
        poolLock.unlock();
      }
      return ret;
    }

    public void checkIn(ClientWrapper client) {
      poolLock.lock();
      try {
        availableClients.add(client);
        checkedOutClients.remove(client);
        availableClientsCondition.signal();
      } finally {
        poolLock.unlock();
      }
    }

    public void destroy(ClientWrapper client) {
      poolLock.lock();
      try {
        checkedOutClients.remove(client);
        currentPoolSize--;
      } finally {
        poolLock.unlock();
      }
      client.transport.close();
    }

    public void closeAll() {
      poolLock.lock();
      try {
        for (ClientWrapper c : availableClients) {
          c.transport.close();
          currentPoolSize--;
        }
        for (ClientWrapper c : checkedOutClients) {
          c.transport.close();
          currentPoolSize--;
        }
      } finally {
        poolLock.unlock();
      }
    }
  }
  private static SSLContext createSSLContext(String truststore,
                                             String truststorePassword,
                                             String truststoreType) throws FlumeException {
    SSLContext ctx;
    try {
      ctx = SSLContext.getInstance("TLS");
      TrustManagerFactory tmf;
      tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
      KeyStore ts = null;
      if (truststore != null && truststoreType != null) {
        ts = KeyStore.getInstance(truststoreType);
        ts.load(new FileInputStream(truststore), truststorePassword.toCharArray());
        tmf.init(ts);
      }

      tmf.init(ts);
      ctx.init(null, tmf.getTrustManagers(), null);

    } catch (Exception e) {
      throw new FlumeException("Error creating the transport", e);
    }
    return ctx;
  }
  private static TSocket createSSLSocket(SSLSocketFactory factory, String host,
                                         int port, int timeout, List<String> excludeProtocols)
      throws FlumeException {
    try {
      SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
      socket.setSoTimeout(timeout);

      List<String> enabledProtocols = new ArrayList<String>();
      for (String protocol : socket.getEnabledProtocols()) {
        if (!excludeProtocols.contains(protocol)) {
          enabledProtocols.add(protocol);
        }
      }
      socket.setEnabledProtocols(enabledProtocols.toArray(new String[0]));
      return new TSocket(socket);
    } catch (Exception e) {
      throw new FlumeException("Could not connect to " + host + " on port " + port, e);
    }
  }
}

Now we look at ThriftSourceProtocol

public static class Client extends org.apache.thrift.TServiceClient implements Iface {
    public static class Factory implements org.apache.thrift.TServiceClientFactory<Client> {
      public Factory() {}
      public Client getClient(org.apache.thrift.protocol.TProtocol prot) {
        return new Client(prot);
      }
      public Client getClient(org.apache.thrift.protocol.TProtocol iprot, org.apache.thrift.protocol.TProtocol oprot) {
        return new Client(iprot, oprot);
      }
    }
}

public static class AsyncClient extends org.apache.thrift.async.TAsyncClient implements AsyncIface {
    public static class Factory implements org.apache.thrift.async.TAsyncClientFactory<AsyncClient> {
      private org.apache.thrift.async.TAsyncClientManager clientManager;
      private org.apache.thrift.protocol.TProtocolFactory protocolFactory;
      public Factory(org.apache.thrift.async.TAsyncClientManager clientManager, org.apache.thrift.protocol.TProtocolFactory protocolFactory) {
        this.clientManager = clientManager;
        this.protocolFactory = protocolFactory;
      }
      public AsyncClient getAsyncClient(org.apache.thrift.transport.TNonblockingTransport transport) {
        return new AsyncClient(protocolFactory, clientManager, transport);
      }
    }
  ..................................
}

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
/**
 * Autogenerated by Thrift Compiler (0.7.0)
 *
 * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
 */
package org.apache.flume.thrift;

import org.apache.commons.lang.builder.HashCodeBuilder;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.EnumMap;
import java.util.Set;
import java.util.HashSet;
import java.util.EnumSet;
import java.util.Collections;
import java.util.BitSet;
import java.nio.ByteBuffer;
import java.util.Arrays;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ThriftSourceProtocol {

  public interface Iface {

    public Status append(ThriftFlumeEvent event) throws org.apache.thrift.TException;

    public Status appendBatch(List<ThriftFlumeEvent> events) throws org.apache.thrift.TException;

  }

  public interface AsyncIface {

    public void append(ThriftFlumeEvent event, org.apache.thrift.async.AsyncMethodCallback<AsyncClient.append_call> resultHandler) throws org.apache.thrift.TException;

    public void appendBatch(List<ThriftFlumeEvent> events, org.apache.thrift.async.AsyncMethodCallback<AsyncClient.appendBatch_call> resultHandler) throws org.apache.thrift.TException;

  }

  public static class Client extends org.apache.thrift.TServiceClient implements Iface {
    public static class Factory implements org.apache.thrift.TServiceClientFactory<Client> {
      public Factory() {}
      public Client getClient(org.apache.thrift.protocol.TProtocol prot) {
        return new Client(prot);
      }
      public Client getClient(org.apache.thrift.protocol.TProtocol iprot, org.apache.thrift.protocol.TProtocol oprot) {
        return new Client(iprot, oprot);
      }
    }

    public Client(org.apache.thrift.protocol.TProtocol prot)
    {
      super(prot, prot);
    }

    public Client(org.apache.thrift.protocol.TProtocol iprot, org.apache.thrift.protocol.TProtocol oprot) {
      super(iprot, oprot);
    }

    public Status append(ThriftFlumeEvent event) throws org.apache.thrift.TException
    {
      send_append(event);
      return recv_append();
    }

    public void send_append(ThriftFlumeEvent event) throws org.apache.thrift.TException
    {
      append_args args = new append_args();
      args.setEvent(event);
      sendBase("append", args);
    }

    public Status recv_append() throws org.apache.thrift.TException
    {
      append_result result = new append_result();
      receiveBase(result, "append");
      if (result.isSetSuccess()) {
        return result.success;
      }
      throw new org.apache.thrift.TApplicationException(org.apache.thrift.TApplicationException.MISSING_RESULT, "append failed: unknown result");
    }

    public Status appendBatch(List<ThriftFlumeEvent> events) throws org.apache.thrift.TException
    {
      send_appendBatch(events);
      return recv_appendBatch();
    }

    public void send_appendBatch(List<ThriftFlumeEvent> events) throws org.apache.thrift.TException
    {
      appendBatch_args args = new appendBatch_args();
      args.setEvents(events);
      sendBase("appendBatch", args);
    }

    public Status recv_appendBatch() throws org.apache.thrift.TException
    {
      appendBatch_result result = new appendBatch_result();
      receiveBase(result, "appendBatch");
      if (result.isSetSuccess()) {
        return result.success;
      }
      throw new org.apache.thrift.TApplicationException(org.apache.thrift.TApplicationException.MISSING_RESULT, "appendBatch failed: unknown result");
    }

  }
  public static class AsyncClient extends org.apache.thrift.async.TAsyncClient implements AsyncIface {
    public static class Factory implements org.apache.thrift.async.TAsyncClientFactory<AsyncClient> {
      private org.apache.thrift.async.TAsyncClientManager clientManager;
      private org.apache.thrift.protocol.TProtocolFactory protocolFactory;
      public Factory(org.apache.thrift.async.TAsyncClientManager clientManager, org.apache.thrift.protocol.TProtocolFactory protocolFactory) {
        this.clientManager = clientManager;
        this.protocolFactory = protocolFactory;
      }
      public AsyncClient getAsyncClient(org.apache.thrift.transport.TNonblockingTransport transport) {
        return new AsyncClient(protocolFactory, clientManager, transport);
      }
    }

    public AsyncClient(org.apache.thrift.protocol.TProtocolFactory protocolFactory, org.apache.thrift.async.TAsyncClientManager clientManager, org.apache.thrift.transport.TNonblockingTransport transport) {
      super(protocolFactory, clientManager, transport);
    }

    public void append(ThriftFlumeEvent event, org.apache.thrift.async.AsyncMethodCallback<append_call> resultHandler) throws org.apache.thrift.TException {
      checkReady();
      append_call method_call = new append_call(event, resultHandler, this, ___protocolFactory, ___transport);
      this.___currentMethod = method_call;
      ___manager.call(method_call);
    }

    public static class append_call extends org.apache.thrift.async.TAsyncMethodCall {
      private ThriftFlumeEvent event;
      public append_call(ThriftFlumeEvent event, org.apache.thrift.async.AsyncMethodCallback<append_call> resultHandler, org.apache.thrift.async.TAsyncClient client, org.apache.thrift.protocol.TProtocolFactory protocolFactory, org.apache.thrift.transport.TNonblockingTransport transport) throws org.apache.thrift.TException {
        super(client, protocolFactory, transport, resultHandler, false);
        this.event = event;
      }

      public void write_args(org.apache.thrift.protocol.TProtocol prot) throws org.apache.thrift.TException {
        prot.writeMessageBegin(new org.apache.thrift.protocol.TMessage("append", org.apache.thrift.protocol.TMessageType.CALL, 0));
        append_args args = new append_args();
        args.setEvent(event);
        args.write(prot);
        prot.writeMessageEnd();
      }

      public Status getResult() throws org.apache.thrift.TException {
        if (getState() != org.apache.thrift.async.TAsyncMethodCall.State.RESPONSE_READ) {
          throw new IllegalStateException("Method call not finished!");
        }
        org.apache.thrift.transport.TMemoryInputTransport memoryTransport = new org.apache.thrift.transport.TMemoryInputTransport(getFrameBuffer().array());
        org.apache.thrift.protocol.TProtocol prot = client.getProtocolFactory().getProtocol(memoryTransport);
        return (new Client(prot)).recv_append();
      }
    }

    public void appendBatch(List<ThriftFlumeEvent> events, org.apache.thrift.async.AsyncMethodCallback<appendBatch_call> resultHandler) throws org.apache.thrift.TException {
      checkReady();
      appendBatch_call method_call = new appendBatch_call(events, resultHandler, this, ___protocolFactory, ___transport);
      this.___currentMethod = method_call;
      ___manager.call(method_call);
    }

    public static class appendBatch_call extends org.apache.thrift.async.TAsyncMethodCall {
      private List<ThriftFlumeEvent> events;
      public appendBatch_call(List<ThriftFlumeEvent> events, org.apache.thrift.async.AsyncMethodCallback<appendBatch_call> resultHandler, org.apache.thrift.async.TAsyncClient client, org.apache.thrift.protocol.TProtocolFactory protocolFactory, org.apache.thrift.transport.TNonblockingTransport transport) throws org.apache.thrift.TException {
        super(client, protocolFactory, transport, resultHandler, false);
        this.events = events;
      }

      public void write_args(org.apache.thrift.protocol.TProtocol prot) throws org.apache.thrift.TException {
        prot.writeMessageBegin(new org.apache.thrift.protocol.TMessage("appendBatch", org.apache.thrift.protocol.TMessageType.CALL, 0));
        appendBatch_args args = new appendBatch_args();
        args.setEvents(events);
        args.write(prot);
        prot.writeMessageEnd();
      }

      public Status getResult() throws org.apache.thrift.TException {
        if (getState() != org.apache.thrift.async.TAsyncMethodCall.State.RESPONSE_READ) {
          throw new IllegalStateException("Method call not finished!");
        }
        org.apache.thrift.transport.TMemoryInputTransport memoryTransport = new org.apache.thrift.transport.TMemoryInputTransport(getFrameBuffer().array());
        org.apache.thrift.protocol.TProtocol prot = client.getProtocolFactory().getProtocol(memoryTransport);
        return (new Client(prot)).recv_appendBatch();
      }
    }

  }

  public static class Processor<I extends Iface> extends org.apache.thrift.TBaseProcessor implements org.apache.thrift.TProcessor {
    private static final Logger LOGGER = LoggerFactory.getLogger(Processor.class.getName());
    public Processor(I iface) {
      super(iface, getProcessMap(new HashMap<String, org.apache.thrift.ProcessFunction<I, ? extends org.apache.thrift.TBase>>()));
    }

    protected Processor(I iface, Map<String,  org.apache.thrift.ProcessFunction<I, ? extends  org.apache.thrift.TBase>> processMap) {
      super(iface, getProcessMap(processMap));
    }

    private static <I extends Iface> Map<String,  org.apache.thrift.ProcessFunction<I, ? extends  org.apache.thrift.TBase>> getProcessMap(Map<String,  org.apache.thrift.ProcessFunction<I, ? extends  org.apache.thrift.TBase>> processMap) {
      processMap.put("append", new append());
      processMap.put("appendBatch", new appendBatch());
      return processMap;
    }

    private static class append<I extends Iface> extends org.apache.thrift.ProcessFunction<I, append_args> {
      public append() {
        super("append");
      }

      public append_args getEmptyArgsInstance() {
        return new append_args();
      }

      public append_result getResult(I iface, append_args args) throws org
          .apache.thrift.TException {
        append_result result = new append_result();
        result.success = iface.append(args.event);
        return result;
      }

      protected boolean isOneway() {
        return false;
      }
    }

    private static class appendBatch<I extends Iface> extends org.apache.thrift.ProcessFunction<I, appendBatch_args> {
      public appendBatch() {
        super("appendBatch");
      }

      public appendBatch_args getEmptyArgsInstance() {
        return new appendBatch_args();
      }

      public appendBatch_result getResult(I iface, appendBatch_args args)
          throws org.apache.thrift.TException {
        appendBatch_result result = new appendBatch_result();
        result.success = iface.appendBatch(args.events);
        return result;
      }

      protected boolean isOneway() {
        return false;
      }
    }

  }

  public static class append_args implements org.apache.thrift.TBase<append_args, append_args._Fields>, java.io.Serializable, Cloneable   {
    private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("append_args");

    private static final org.apache.thrift.protocol.TField EVENT_FIELD_DESC = new org.apache.thrift.protocol.TField("event", org.apache.thrift.protocol.TType.STRUCT, (short)1);

    public ThriftFlumeEvent event; // required

    /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
    public enum _Fields implements org.apache.thrift.TFieldIdEnum {
      EVENT((short)1, "event");

      private static final Map<String, _Fields> byName = new HashMap<String, _Fields>();

      static {
        for (_Fields field : EnumSet.allOf(_Fields.class)) {
          byName.put(field.getFieldName(), field);
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, or null if its not found.
       */
      public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 1: // EVENT
            return EVENT;
          default:
            return null;
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, throwing an exception
       * if it is not found.
       */
      public static _Fields findByThriftIdOrThrow(int fieldId) {
        _Fields fields = findByThriftId(fieldId);
        if (fields == null) throw new IllegalArgumentException("Field " + fieldId + " doesn't exist!");
        return fields;
      }

      /**
       * Find the _Fields constant that matches name, or null if its not found.
       */
      public static _Fields findByName(String name) {
        return byName.get(name);
      }

      private final short _thriftId;
      private final String _fieldName;

      _Fields(short thriftId, String fieldName) {
        _thriftId = thriftId;
        _fieldName = fieldName;
      }

      public short getThriftFieldId() {
        return _thriftId;
      }

      public String getFieldName() {
        return _fieldName;
      }
    }

    // isset id assignments

    public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
    static {
      Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
      tmpMap.put(_Fields.EVENT, new org.apache.thrift.meta_data.FieldMetaData("event", org.apache.thrift.TFieldRequirementType.DEFAULT,
          new org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT, ThriftFlumeEvent.class)));
      metaDataMap = Collections.unmodifiableMap(tmpMap);
      org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(append_args.class, metaDataMap);
    }

    public append_args() {
    }

    public append_args(
      ThriftFlumeEvent event)
    {
      this();
      this.event = event;
    }

    /**
     * Performs a deep copy on <i>other</i>.
     */
    public append_args(append_args other) {
      if (other.isSetEvent()) {
        this.event = new ThriftFlumeEvent(other.event);
      }
    }

    public append_args deepCopy() {
      return new append_args(this);
    }

    @Override
    public void clear() {
      this.event = null;
    }

    public ThriftFlumeEvent getEvent() {
      return this.event;
    }

    public append_args setEvent(ThriftFlumeEvent event) {
      this.event = event;
      return this;
    }

    public void unsetEvent() {
      this.event = null;
    }

    /** Returns true if field event is set (has been assigned a value) and false otherwise */
    public boolean isSetEvent() {
      return this.event != null;
    }

    public void setEventIsSet(boolean value) {
      if (!value) {
        this.event = null;
      }
    }

    public void setFieldValue(_Fields field, Object value) {
      switch (field) {
      case EVENT:
        if (value == null) {
          unsetEvent();
        } else {
          setEvent((ThriftFlumeEvent)value);
        }
        break;

      }
    }

    public Object getFieldValue(_Fields field) {
      switch (field) {
      case EVENT:
        return getEvent();

      }
      throw new IllegalStateException();
    }

    /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
    public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }

      switch (field) {
      case EVENT:
        return isSetEvent();
      }
      throw new IllegalStateException();
    }

    @Override
    public boolean equals(Object that) {
      if (that == null)
        return false;
      if (that instanceof append_args)
        return this.equals((append_args)that);
      return false;
    }

    public boolean equals(append_args that) {
      if (that == null)
        return false;

      boolean this_present_event = true && this.isSetEvent();
      boolean that_present_event = true && that.isSetEvent();
      if (this_present_event || that_present_event) {
        if (!(this_present_event && that_present_event))
          return false;
        if (!this.event.equals(that.event))
          return false;
      }

      return true;
    }

    @Override
    public int hashCode() {
      HashCodeBuilder builder = new HashCodeBuilder();

      boolean present_event = true && (isSetEvent());
      builder.append(present_event);
      if (present_event)
        builder.append(event);

      return builder.toHashCode();
    }

    public int compareTo(append_args other) {
      if (!getClass().equals(other.getClass())) {
        return getClass().getName().compareTo(other.getClass().getName());
      }

      int lastComparison = 0;
      append_args typedOther = (append_args)other;

      lastComparison = Boolean.valueOf(isSetEvent()).compareTo(typedOther.isSetEvent());
      if (lastComparison != 0) {
        return lastComparison;
      }
      if (isSetEvent()) {
        lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.event, typedOther.event);
        if (lastComparison != 0) {
          return lastComparison;
        }
      }
      return 0;
    }

    public _Fields fieldForId(int fieldId) {
      return _Fields.findByThriftId(fieldId);
    }

    public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
      org.apache.thrift.protocol.TField field;
      iprot.readStructBegin();
      while (true)
      {
        field = iprot.readFieldBegin();
        if (field.type == org.apache.thrift.protocol.TType.STOP) {
          break;
        }
        switch (field.id) {
          case 1: // EVENT
            if (field.type == org.apache.thrift.protocol.TType.STRUCT) {
              this.event = new ThriftFlumeEvent();
              this.event.read(iprot);
            } else {
              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
            }
            break;
          default:
            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
        }
        iprot.readFieldEnd();
      }
      iprot.readStructEnd();

      // check for required fields of primitive type, which can't be checked in the validate method
      validate();
    }

    public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
      validate();

      oprot.writeStructBegin(STRUCT_DESC);
      if (this.event != null) {
        oprot.writeFieldBegin(EVENT_FIELD_DESC);
        this.event.write(oprot);
        oprot.writeFieldEnd();
      }
      oprot.writeFieldStop();
      oprot.writeStructEnd();
    }

    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder("append_args(");
      boolean first = true;

      sb.append("event:");
      if (this.event == null) {
        sb.append("null");
      } else {
        sb.append(this.event);
      }
      first = false;
      sb.append(")");
      return sb.toString();
    }

    public void validate() throws org.apache.thrift.TException {
      // check for required fields
    }

    private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
      try {
        write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

    private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, ClassNotFoundException {
      try {
        read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

  }

  public static class append_result implements org.apache.thrift.TBase<append_result, append_result._Fields>, java.io.Serializable, Cloneable   {
    private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("append_result");

    private static final org.apache.thrift.protocol.TField SUCCESS_FIELD_DESC = new org.apache.thrift.protocol.TField("success", org.apache.thrift.protocol.TType.I32, (short)0);

    /**
     *
     * @see Status
     */
    public Status success; // required

    /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
    public enum _Fields implements org.apache.thrift.TFieldIdEnum {
      /**
       *
       * @see Status
       */
      SUCCESS((short)0, "success");

      private static final Map<String, _Fields> byName = new HashMap<String, _Fields>();

      static {
        for (_Fields field : EnumSet.allOf(_Fields.class)) {
          byName.put(field.getFieldName(), field);
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, or null if its not found.
       */
      public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 0: // SUCCESS
            return SUCCESS;
          default:
            return null;
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, throwing an exception
       * if it is not found.
       */
      public static _Fields findByThriftIdOrThrow(int fieldId) {
        _Fields fields = findByThriftId(fieldId);
        if (fields == null) throw new IllegalArgumentException("Field " + fieldId + " doesn't exist!");
        return fields;
      }

      /**
       * Find the _Fields constant that matches name, or null if its not found.
       */
      public static _Fields findByName(String name) {
        return byName.get(name);
      }

      private final short _thriftId;
      private final String _fieldName;

      _Fields(short thriftId, String fieldName) {
        _thriftId = thriftId;
        _fieldName = fieldName;
      }

      public short getThriftFieldId() {
        return _thriftId;
      }

      public String getFieldName() {
        return _fieldName;
      }
    }

    // isset id assignments

    public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
    static {
      Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
      tmpMap.put(_Fields.SUCCESS, new org.apache.thrift.meta_data.FieldMetaData("success", org.apache.thrift.TFieldRequirementType.DEFAULT,
          new org.apache.thrift.meta_data.EnumMetaData(org.apache.thrift.protocol.TType.ENUM, Status.class)));
      metaDataMap = Collections.unmodifiableMap(tmpMap);
      org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(append_result.class, metaDataMap);
    }

    public append_result() {
    }

    public append_result(
      Status success)
    {
      this();
      this.success = success;
    }

    /**
     * Performs a deep copy on <i>other</i>.
     */
    public append_result(append_result other) {
      if (other.isSetSuccess()) {
        this.success = other.success;
      }
    }

    public append_result deepCopy() {
      return new append_result(this);
    }

    @Override
    public void clear() {
      this.success = null;
    }

    /**
     *
     * @see Status
     */
    public Status getSuccess() {
      return this.success;
    }

    /**
     *
     * @see Status
     */
    public append_result setSuccess(Status success) {
      this.success = success;
      return this;
    }

    public void unsetSuccess() {
      this.success = null;
    }

    /** Returns true if field success is set (has been assigned a value) and false otherwise */
    public boolean isSetSuccess() {
      return this.success != null;
    }

    public void setSuccessIsSet(boolean value) {
      if (!value) {
        this.success = null;
      }
    }

    public void setFieldValue(_Fields field, Object value) {
      switch (field) {
      case SUCCESS:
        if (value == null) {
          unsetSuccess();
        } else {
          setSuccess((Status)value);
        }
        break;

      }
    }

    public Object getFieldValue(_Fields field) {
      switch (field) {
      case SUCCESS:
        return getSuccess();

      }
      throw new IllegalStateException();
    }

    /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
    public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }

      switch (field) {
      case SUCCESS:
        return isSetSuccess();
      }
      throw new IllegalStateException();
    }

    @Override
    public boolean equals(Object that) {
      if (that == null)
        return false;
      if (that instanceof append_result)
        return this.equals((append_result)that);
      return false;
    }

    public boolean equals(append_result that) {
      if (that == null)
        return false;

      boolean this_present_success = true && this.isSetSuccess();
      boolean that_present_success = true && that.isSetSuccess();
      if (this_present_success || that_present_success) {
        if (!(this_present_success && that_present_success))
          return false;
        if (!this.success.equals(that.success))
          return false;
      }

      return true;
    }

    @Override
    public int hashCode() {
      HashCodeBuilder builder = new HashCodeBuilder();

      boolean present_success = true && (isSetSuccess());
      builder.append(present_success);
      if (present_success)
        builder.append(success.getValue());

      return builder.toHashCode();
    }

    public int compareTo(append_result other) {
      if (!getClass().equals(other.getClass())) {
        return getClass().getName().compareTo(other.getClass().getName());
      }

      int lastComparison = 0;
      append_result typedOther = (append_result)other;

      lastComparison = Boolean.valueOf(isSetSuccess()).compareTo(typedOther.isSetSuccess());
      if (lastComparison != 0) {
        return lastComparison;
      }
      if (isSetSuccess()) {
        lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.success, typedOther.success);
        if (lastComparison != 0) {
          return lastComparison;
        }
      }
      return 0;
    }

    public _Fields fieldForId(int fieldId) {
      return _Fields.findByThriftId(fieldId);
    }

    public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
      org.apache.thrift.protocol.TField field;
      iprot.readStructBegin();
      while (true)
      {
        field = iprot.readFieldBegin();
        if (field.type == org.apache.thrift.protocol.TType.STOP) {
          break;
        }
        switch (field.id) {
          case 0: // SUCCESS
            if (field.type == org.apache.thrift.protocol.TType.I32) {
              this.success = Status.findByValue(iprot.readI32());
            } else {
              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
            }
            break;
          default:
            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
        }
        iprot.readFieldEnd();
      }
      iprot.readStructEnd();

      // check for required fields of primitive type, which can't be checked in the validate method
      validate();
    }

    public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
      oprot.writeStructBegin(STRUCT_DESC);

      if (this.isSetSuccess()) {
        oprot.writeFieldBegin(SUCCESS_FIELD_DESC);
        oprot.writeI32(this.success.getValue());
        oprot.writeFieldEnd();
      }
      oprot.writeFieldStop();
      oprot.writeStructEnd();
    }

    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder("append_result(");
      boolean first = true;

      sb.append("success:");
      if (this.success == null) {
        sb.append("null");
      } else {
        sb.append(this.success);
      }
      first = false;
      sb.append(")");
      return sb.toString();
    }

    public void validate() throws org.apache.thrift.TException {
      // check for required fields
    }

    private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
      try {
        write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

    private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, ClassNotFoundException {
      try {
        read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

  }

  public static class appendBatch_args implements org.apache.thrift.TBase<appendBatch_args, appendBatch_args._Fields>, java.io.Serializable, Cloneable   {
    private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("appendBatch_args");

    private static final org.apache.thrift.protocol.TField EVENTS_FIELD_DESC = new org.apache.thrift.protocol.TField("events", org.apache.thrift.protocol.TType.LIST, (short)1);

    public List<ThriftFlumeEvent> events; // required

    /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
    public enum _Fields implements org.apache.thrift.TFieldIdEnum {
      EVENTS((short)1, "events");

      private static final Map<String, _Fields> byName = new HashMap<String, _Fields>();

      static {
        for (_Fields field : EnumSet.allOf(_Fields.class)) {
          byName.put(field.getFieldName(), field);
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, or null if its not found.
       */
      public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 1: // EVENTS
            return EVENTS;
          default:
            return null;
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, throwing an exception
       * if it is not found.
       */
      public static _Fields findByThriftIdOrThrow(int fieldId) {
        _Fields fields = findByThriftId(fieldId);
        if (fields == null) throw new IllegalArgumentException("Field " + fieldId + " doesn't exist!");
        return fields;
      }

      /**
       * Find the _Fields constant that matches name, or null if its not found.
       */
      public static _Fields findByName(String name) {
        return byName.get(name);
      }

      private final short _thriftId;
      private final String _fieldName;

      _Fields(short thriftId, String fieldName) {
        _thriftId = thriftId;
        _fieldName = fieldName;
      }

      public short getThriftFieldId() {
        return _thriftId;
      }

      public String getFieldName() {
        return _fieldName;
      }
    }

    // isset id assignments

    public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
    static {
      Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
      tmpMap.put(_Fields.EVENTS, new org.apache.thrift.meta_data.FieldMetaData("events", org.apache.thrift.TFieldRequirementType.DEFAULT,
          new org.apache.thrift.meta_data.ListMetaData(org.apache.thrift.protocol.TType.LIST,
              new org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT, ThriftFlumeEvent.class))));
      metaDataMap = Collections.unmodifiableMap(tmpMap);
      org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(appendBatch_args.class, metaDataMap);
    }

    public appendBatch_args() {
    }

    public appendBatch_args(
      List<ThriftFlumeEvent> events)
    {
      this();
      this.events = events;
    }

    /**
     * Performs a deep copy on <i>other</i>.
     */
    public appendBatch_args(appendBatch_args other) {
      if (other.isSetEvents()) {
        List<ThriftFlumeEvent> __this__events = new ArrayList<ThriftFlumeEvent>();
        for (ThriftFlumeEvent other_element : other.events) {
          __this__events.add(new ThriftFlumeEvent(other_element));
        }
        this.events = __this__events;
      }
    }

    public appendBatch_args deepCopy() {
      return new appendBatch_args(this);
    }

    @Override
    public void clear() {
      this.events = null;
    }

    public int getEventsSize() {
      return (this.events == null) ? 0 : this.events.size();
    }

    public java.util.Iterator<ThriftFlumeEvent> getEventsIterator() {
      return (this.events == null) ? null : this.events.iterator();
    }

    public void addToEvents(ThriftFlumeEvent elem) {
      if (this.events == null) {
        this.events = new ArrayList<ThriftFlumeEvent>();
      }
      this.events.add(elem);
    }

    public List<ThriftFlumeEvent> getEvents() {
      return this.events;
    }

    public appendBatch_args setEvents(List<ThriftFlumeEvent> events) {
      this.events = events;
      return this;
    }

    public void unsetEvents() {
      this.events = null;
    }

    /** Returns true if field events is set (has been assigned a value) and false otherwise */
    public boolean isSetEvents() {
      return this.events != null;
    }

    public void setEventsIsSet(boolean value) {
      if (!value) {
        this.events = null;
      }
    }

    public void setFieldValue(_Fields field, Object value) {
      switch (field) {
      case EVENTS:
        if (value == null) {
          unsetEvents();
        } else {
          setEvents((List<ThriftFlumeEvent>)value);
        }
        break;

      }
    }

    public Object getFieldValue(_Fields field) {
      switch (field) {
      case EVENTS:
        return getEvents();

      }
      throw new IllegalStateException();
    }

    /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
    public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }

      switch (field) {
      case EVENTS:
        return isSetEvents();
      }
      throw new IllegalStateException();
    }

    @Override
    public boolean equals(Object that) {
      if (that == null)
        return false;
      if (that instanceof appendBatch_args)
        return this.equals((appendBatch_args)that);
      return false;
    }

    public boolean equals(appendBatch_args that) {
      if (that == null)
        return false;

      boolean this_present_events = true && this.isSetEvents();
      boolean that_present_events = true && that.isSetEvents();
      if (this_present_events || that_present_events) {
        if (!(this_present_events && that_present_events))
          return false;
        if (!this.events.equals(that.events))
          return false;
      }

      return true;
    }

    @Override
    public int hashCode() {
      HashCodeBuilder builder = new HashCodeBuilder();

      boolean present_events = true && (isSetEvents());
      builder.append(present_events);
      if (present_events)
        builder.append(events);

      return builder.toHashCode();
    }

    public int compareTo(appendBatch_args other) {
      if (!getClass().equals(other.getClass())) {
        return getClass().getName().compareTo(other.getClass().getName());
      }

      int lastComparison = 0;
      appendBatch_args typedOther = (appendBatch_args)other;

      lastComparison = Boolean.valueOf(isSetEvents()).compareTo(typedOther.isSetEvents());
      if (lastComparison != 0) {
        return lastComparison;
      }
      if (isSetEvents()) {
        lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.events, typedOther.events);
        if (lastComparison != 0) {
          return lastComparison;
        }
      }
      return 0;
    }

    public _Fields fieldForId(int fieldId) {
      return _Fields.findByThriftId(fieldId);
    }

    public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
      org.apache.thrift.protocol.TField field;
      iprot.readStructBegin();
      while (true)
      {
        field = iprot.readFieldBegin();
        if (field.type == org.apache.thrift.protocol.TType.STOP) {
          break;
        }
        switch (field.id) {
          case 1: // EVENTS
            if (field.type == org.apache.thrift.protocol.TType.LIST) {
              {
                org.apache.thrift.protocol.TList _list5 = iprot.readListBegin();
                this.events = new ArrayList<ThriftFlumeEvent>(_list5.size);
                for (int _i6 = 0; _i6 < _list5.size; ++_i6)
                {
                  ThriftFlumeEvent _elem7; // required
                  _elem7 = new ThriftFlumeEvent();
                  _elem7.read(iprot);
                  this.events.add(_elem7);
                }
                iprot.readListEnd();
              }
            } else {
              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
            }
            break;
          default:
            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
        }
        iprot.readFieldEnd();
      }
      iprot.readStructEnd();

      // check for required fields of primitive type, which can't be checked in the validate method
      validate();
    }

    public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
      validate();

      oprot.writeStructBegin(STRUCT_DESC);
      if (this.events != null) {
        oprot.writeFieldBegin(EVENTS_FIELD_DESC);
        {
          oprot.writeListBegin(new org.apache.thrift.protocol.TList(org.apache.thrift.protocol.TType.STRUCT, this.events.size()));
          for (ThriftFlumeEvent _iter8 : this.events)
          {
            _iter8.write(oprot);
          }
          oprot.writeListEnd();
        }
        oprot.writeFieldEnd();
      }
      oprot.writeFieldStop();
      oprot.writeStructEnd();
    }

    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder("appendBatch_args(");
      boolean first = true;

      sb.append("events:");
      if (this.events == null) {
        sb.append("null");
      } else {
        sb.append(this.events);
      }
      first = false;
      sb.append(")");
      return sb.toString();
    }

    public void validate() throws org.apache.thrift.TException {
      // check for required fields
    }

    private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
      try {
        write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

    private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, ClassNotFoundException {
      try {
        read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

  }

  public static class appendBatch_result implements org.apache.thrift.TBase<appendBatch_result, appendBatch_result._Fields>, java.io.Serializable, Cloneable   {
    private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new org.apache.thrift.protocol.TStruct("appendBatch_result");

    private static final org.apache.thrift.protocol.TField SUCCESS_FIELD_DESC = new org.apache.thrift.protocol.TField("success", org.apache.thrift.protocol.TType.I32, (short)0);

    /**
     *
     * @see Status
     */
    public Status success; // required

    /** The set of fields this struct contains, along with convenience methods for finding and manipulating them. */
    public enum _Fields implements org.apache.thrift.TFieldIdEnum {
      /**
       *
       * @see Status
       */
      SUCCESS((short)0, "success");

      private static final Map<String, _Fields> byName = new HashMap<String, _Fields>();

      static {
        for (_Fields field : EnumSet.allOf(_Fields.class)) {
          byName.put(field.getFieldName(), field);
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, or null if its not found.
       */
      public static _Fields findByThriftId(int fieldId) {
        switch(fieldId) {
          case 0: // SUCCESS
            return SUCCESS;
          default:
            return null;
        }
      }

      /**
       * Find the _Fields constant that matches fieldId, throwing an exception
       * if it is not found.
       */
      public static _Fields findByThriftIdOrThrow(int fieldId) {
        _Fields fields = findByThriftId(fieldId);
        if (fields == null) throw new IllegalArgumentException("Field " + fieldId + " doesn't exist!");
        return fields;
      }

      /**
       * Find the _Fields constant that matches name, or null if its not found.
       */
      public static _Fields findByName(String name) {
        return byName.get(name);
      }

      private final short _thriftId;
      private final String _fieldName;

      _Fields(short thriftId, String fieldName) {
        _thriftId = thriftId;
        _fieldName = fieldName;
      }

      public short getThriftFieldId() {
        return _thriftId;
      }

      public String getFieldName() {
        return _fieldName;
      }
    }

    // isset id assignments

    public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> metaDataMap;
    static {
      Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
      tmpMap.put(_Fields.SUCCESS, new org.apache.thrift.meta_data.FieldMetaData("success", org.apache.thrift.TFieldRequirementType.DEFAULT,
          new org.apache.thrift.meta_data.EnumMetaData(org.apache.thrift.protocol.TType.ENUM, Status.class)));
      metaDataMap = Collections.unmodifiableMap(tmpMap);
      org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(appendBatch_result.class, metaDataMap);
    }

    public appendBatch_result() {
    }

    public appendBatch_result(
      Status success)
    {
      this();
      this.success = success;
    }

    /**
     * Performs a deep copy on <i>other</i>.
     */
    public appendBatch_result(appendBatch_result other) {
      if (other.isSetSuccess()) {
        this.success = other.success;
      }
    }

    public appendBatch_result deepCopy() {
      return new appendBatch_result(this);
    }

    @Override
    public void clear() {
      this.success = null;
    }

    /**
     *
     * @see Status
     */
    public Status getSuccess() {
      return this.success;
    }

    /**
     *
     * @see Status
     */
    public appendBatch_result setSuccess(Status success) {
      this.success = success;
      return this;
    }

    public void unsetSuccess() {
      this.success = null;
    }

    /** Returns true if field success is set (has been assigned a value) and false otherwise */
    public boolean isSetSuccess() {
      return this.success != null;
    }

    public void setSuccessIsSet(boolean value) {
      if (!value) {
        this.success = null;
      }
    }

    public void setFieldValue(_Fields field, Object value) {
      switch (field) {
      case SUCCESS:
        if (value == null) {
          unsetSuccess();
        } else {
          setSuccess((Status)value);
        }
        break;

      }
    }

    public Object getFieldValue(_Fields field) {
      switch (field) {
      case SUCCESS:
        return getSuccess();

      }
      throw new IllegalStateException();
    }

    /** Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise */
    public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }

      switch (field) {
      case SUCCESS:
        return isSetSuccess();
      }
      throw new IllegalStateException();
    }

    @Override
    public boolean equals(Object that) {
      if (that == null)
        return false;
      if (that instanceof appendBatch_result)
        return this.equals((appendBatch_result)that);
      return false;
    }

    public boolean equals(appendBatch_result that) {
      if (that == null)
        return false;

      boolean this_present_success = true && this.isSetSuccess();
      boolean that_present_success = true && that.isSetSuccess();
      if (this_present_success || that_present_success) {
        if (!(this_present_success && that_present_success))
          return false;
        if (!this.success.equals(that.success))
          return false;
      }

      return true;
    }

    @Override
    public int hashCode() {
      HashCodeBuilder builder = new HashCodeBuilder();

      boolean present_success = true && (isSetSuccess());
      builder.append(present_success);
      if (present_success)
        builder.append(success.getValue());

      return builder.toHashCode();
    }

    public int compareTo(appendBatch_result other) {
      if (!getClass().equals(other.getClass())) {
        return getClass().getName().compareTo(other.getClass().getName());
      }

      int lastComparison = 0;
      appendBatch_result typedOther = (appendBatch_result)other;

      lastComparison = Boolean.valueOf(isSetSuccess()).compareTo(typedOther.isSetSuccess());
      if (lastComparison != 0) {
        return lastComparison;
      }
      if (isSetSuccess()) {
        lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.success, typedOther.success);
        if (lastComparison != 0) {
          return lastComparison;
        }
      }
      return 0;
    }

    public _Fields fieldForId(int fieldId) {
      return _Fields.findByThriftId(fieldId);
    }

    public void read(org.apache.thrift.protocol.TProtocol iprot) throws org.apache.thrift.TException {
      org.apache.thrift.protocol.TField field;
      iprot.readStructBegin();
      while (true)
      {
        field = iprot.readFieldBegin();
        if (field.type == org.apache.thrift.protocol.TType.STOP) {
          break;
        }
        switch (field.id) {
          case 0: // SUCCESS
            if (field.type == org.apache.thrift.protocol.TType.I32) {
              this.success = Status.findByValue(iprot.readI32());
            } else {
              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
            }
            break;
          default:
            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, field.type);
        }
        iprot.readFieldEnd();
      }
      iprot.readStructEnd();

      // check for required fields of primitive type, which can't be checked in the validate method
      validate();
    }

    public void write(org.apache.thrift.protocol.TProtocol oprot) throws org.apache.thrift.TException {
      oprot.writeStructBegin(STRUCT_DESC);

      if (this.isSetSuccess()) {
        oprot.writeFieldBegin(SUCCESS_FIELD_DESC);
        oprot.writeI32(this.success.getValue());
        oprot.writeFieldEnd();
      }
      oprot.writeFieldStop();
      oprot.writeStructEnd();
    }

    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder("appendBatch_result(");
      boolean first = true;

      sb.append("success:");
      if (this.success == null) {
        sb.append("null");
      } else {
        sb.append(this.success);
      }
      first = false;
      sb.append(")");
      return sb.toString();
    }

    public void validate() throws org.apache.thrift.TException {
      // check for required fields
    }

    private void writeObject(java.io.ObjectOutputStream out) throws java.io.IOException {
      try {
        write(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(out)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

    private void readObject(java.io.ObjectInputStream in) throws java.io.IOException, ClassNotFoundException {
      try {
        read(new org.apache.thrift.protocol.TCompactProtocol(new org.apache.thrift.transport.TIOStreamTransport(in)));
      } catch (org.apache.thrift.TException te) {
        throw new java.io.IOException(te);
      }
    }

  }

}