笔者使用websocket进行通信,服务器异步返回.websocket服务器又异步调用其他websocket,也是异步访问. 由于无法预测服务器调用第三方websocket什么时候调用结束,使用了CountDownLatch. 每次报错都如下: java.lang.reflect.InvocationTargetException: null at sun.reflect.GeneratedMethodAccessor419.invoke(Unknown Source) at sun.refle…
报错 java.lang.NoClassDefFoundError: io/netty/channel/AbstractChannel$AbstractUnsafe$ at io.netty.channel.AbstractChannel$AbstractUnsafe.deregister(AbstractChannel.java:) at io.netty.channel.AbstractChannel$AbstractUnsafe.fireChannelInactiveAndDeregist…
并发框架分类 1. Executor相关类 Interfaces. Executor is a simple standardized interface for defining custom thread-like subsystems, including thread pools, asynchronous I/O, and lightweight task frameworks. Depending on which concrete Executor class is being u…
newFixedThreadPool 创建一个固定大小的线程池. shutdown():用于关闭启动线程,如果不调用该语句,jvm不会关闭. awaitTermination():用于等待子线程结束,再继续执行下面的代码.该例中我设置一直等着子线程结束. Java代码 收藏代码 public class Test { public static void main(String[] args) throws IOException, InterruptedException { Executor…
摘自: www.uml-diagrams.org Here we provide several UML class diagrams for the Java™ 7 java.util.concurrent package. Several java.util.concurrent.* packages introduced with version 5.0 of the Java platform added high-level concurrency features to the Ja…
一.简介 Exchanger是自jdk1.5起开始提供的工具套件,一般用于两个工作线程之间交换数据.在本文中我将采取由浅入深的方式来介绍分析这个工具类.首先我们来看看官方的api文档中的叙述: A synchronization point at which threads can pair and swap elements within pairs. Each thread presents some object on entry to the exchange method, mat…