zookeeper 监听事件 PathChildrenCacheListener

zookeeper 监听事件 PathChildrenCacheListener

PathChildrenCacheListener一次父节点注册，监听每次子节点操作，不监听自身和查询。

1.测试类：

package com.qy.learn.zk.curator;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.cache.PathChildrenCache;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
import org.apache.curator.framework.recipes.cache.PathChildrenCache.StartMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author 七脉
 * 描述：利用父节点，监听子节点的事件，每次都会触发
 */
public class PathChildrenCacheTest {

    private static final Logger log = LoggerFactory.getLogger(PathChildrenCacheTest.class);

    public static void main(String[] args) throws Exception {

        //获取curator客户端
        CuratorFramework client = MyCuratorClient.client();
        //开启客户端
        client.start();

        //cacheData if true, node contents are cached in addition to the stat
        PathChildrenCache pathChildrenCache = new PathChildrenCache(client, "/father",true);
        //StartMode.BUILD_INITIAL_CACHE同步初始化缓存数据
        pathChildrenCache.start(StartMode.BUILD_INITIAL_CACHE);

        //添加节点监听事件,PathChildrenCacheListener每次都会触发
        pathChildrenCache.getListenable().addListener(new PathChildrenCacheListener() {

            @Override
            public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
                log.info("接收到PathChildrenCacheListener监听事件，节点：{}，事件类型：{}", event.getData().getPath(), event.getType());
            }
        });

        //测试事件
        MyCuratorClient.create(client, "/father/me", "me");
        MyCuratorClient.update(client, "/father/me", "me2");
        MyCuratorClient.query(client, "/father/me");//查询不会触发
        MyCuratorClient.delete(client, "/father/me");

        //睡眠等待监听事件触发
        Thread.sleep(15000);

        pathChildrenCache.close();
        client.close();
    }
}

2.pom文件：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
    </parent>

    <groupId>com.qy.learn</groupId>
    <artifactId>qy-learn-zk-curator</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
        <maven.test.skip>true</maven.test.skip>
        <java.version>1.8</java.version>
        <spring.boot.version>2.0.1.RELEASE</spring.boot.version>
        <qy.code.version>0.0.1-SNAPSHOT</qy.code.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <!-- 不使用springboot默认log -->
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.12</version>
            <!-- 排除冲突jar -->
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>4.1.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.1.0</version>
        </dependency>

    </dependencies>

    <repositories>
        <repository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <build>
        <plugins>
            <!-- 要将源码放上去，需要加入这个插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-source-plugin</artifactId>
                <configuration>
                    <attach>true</attach>
                </configuration>
                <executions>
                    <execution>
                        <phase>compile</phase>
                        <goals>
                            <goal>jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

源码：https://pan.baidu.com/s/1WxW0NU6p7oAiK9O3Vtq-Hg