XxlJobConfig

执行器端通过XxlJobConfig类作为xxl-job的启动入口。通过注解@bean的initMethod的方法来启动xxl-job。

/**
 * xxl-job config
 *
 * @author xuxueli 2017-04-28
 */
@Configuration
public class XxlJobConfig {

    @Bean(initMethod = "start", destroyMethod = "destroy")
    public XxlJobSpringExecutor xxlJobExecutor() {
        logger.info(">>>>>>>>>>> xxl-job config init.");
        XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
        xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
        xxlJobSpringExecutor.setAppName(appName);
        xxlJobSpringExecutor.setIp(ip);
        xxlJobSpringExecutor.setPort(port);
        xxlJobSpringExecutor.setAccessToken(accessToken);
        xxlJobSpringExecutor.setLogPath(logPath);
        xxlJobSpringExecutor.setLogRetentionDays(logRetentionDays);

        return xxlJobSpringExecutor;
    }

}

XxlJobSpringExecutor

XxlJobSpringExecutor的start()方法，首先初始化执行器端的所有执行器，再调用XxlJobExecutor的start()方法。

public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationContextAware
{
    @Override
    public void start() throws Exception {

        // init JobHandler Repository
        initJobHandlerRepository(applicationContext);

        // refresh GlueFactory
        GlueFactory.refreshInstance(1);


        // super start
        super.start();
    }

由于XxlJobSpringExecutor实现了ApplicationContextAware接口，在Spring启动时，会调用setApplicationContext()方法，设置ApplicationContext，用于访问spring bean。

initJobHandlerRepository方法获取所有应用了@JobHandler注解的JobHandler，并注册。

    private void initJobHandlerRepository(ApplicationContext applicationContext){
        if (applicationContext == null) {
            return;
        }

        // init job handler action
        Map<String, Object> serviceBeanMap = applicationContext.getBeansWithAnnotation(JobHandler.class);

        if (serviceBeanMap!=null && serviceBeanMap.size()>0) {
            for (Object serviceBean : serviceBeanMap.values()) {
                if (serviceBean instanceof IJobHandler){
                    String name = serviceBean.getClass().getAnnotation(JobHandler.class).value();
                    IJobHandler handler = (IJobHandler) serviceBean;
                    if (loadJobHandler(name) != null) {
                        throw new RuntimeException("xxl-job jobhandler["+ name +"] naming conflicts.");
                    }
                    registJobHandler(name, handler);
                }
            }
        }
    }

XxlJobExecutor

XxlJobExecutor的start()方法

    public void start() throws Exception {

        // init logpath
        XxlJobFileAppender.initLogPath(logPath);

        // init invoker, admin-client
        initAdminBizList(adminAddresses, accessToken);


        //开启日志清理线程
        JobLogFileCleanThread.getInstance().start(logRetentionDays);

        // 初始化触发器回调线程(用RPC回调调度中心接口)
        TriggerCallbackThread.getInstance().start();

        //初始化Rpc服务
        port = port>0?port: NetUtil.findAvailablePort(9999);
        ip = (ip!=null&&ip.trim().length()>0)?ip: IpUtil.getIp();
        initRpcProvider(ip, port, appName, accessToken);
    }

初始化RPC服务

    private void initRpcProvider(String ip, int port, String appName, String accessToken) throws Exception {

        // init, provider factory
        String address = IpUtil.getIpPort(ip, port);
        Map<String, String> serviceRegistryParam = new HashMap<String, String>();
        serviceRegistryParam.put("appName", appName);
        serviceRegistryParam.put("address", address);

        xxlRpcProviderFactory = new XxlRpcProviderFactory();
//初始化
        xxlRpcProviderFactory.initConfig(NetEnum.NETTY_HTTP, Serializer.SerializeEnum.HESSIAN.getSerializer(), ip, port, accessToken, ExecutorServiceRegistry.class, serviceRegistryParam);

        // add services
        xxlRpcProviderFactory.addService(ExecutorBiz.class.getName(), null, new ExecutorBizImpl());

        // start
        xxlRpcProviderFactory.start();

    }

Rpc服务启动

  • 构造server。
  • 设置started回调，stoped回调。
  • start server。

	public void start() throws Exception {
		// 启动服务
		serviceAddress = IpUtil.getIpPort(this.ip, port);
		server = netType.serverClass.newInstance();
		server.setStartedCallback(new BaseCallback() {		// serviceRegistry started
			@Override
			public void run() throws Exception {
				// start registry
				if (serviceRegistryClass != null) {
					serviceRegistry = serviceRegistryClass.newInstance();
					serviceRegistry.start(serviceRegistryParam);
					if (serviceData.size() > 0) {
						serviceRegistry.registry(serviceData.keySet(), serviceAddress);
					}
				}
			}
		});
		server.setStopedCallback(new BaseCallback() {		// serviceRegistry stoped
			@Override
			public void run() {
				// stop registry
				if (serviceRegistry != null) {
					if (serviceData.size() > 0) {
						serviceRegistry.remove(serviceData.keySet(), serviceAddress);
					}
					serviceRegistry.stop();
					serviceRegistry = null;
				}
			}
		});
		server.start(this);
	}

提供了几种server：

public enum NetEnum {


	/**
	 * netty tcp server
	 */
	NETTY(NettyServer.class, NettyClient.class),

	/**
	 * netty http server (servlet no server, ServletServerHandler)
	 */
	NETTY_HTTP(NettyHttpServer.class, NettyHttpClient.class),

	/**
	 * mina tcp server
	 */
	MINA(MinaServer.class, MinaClient.class),

	/**
	 * jetty http server
	 */
	JETTY(JettyServer .class, JettyClient .class);

	public final Class<? extends Server> serverClass;
	public final Class<? extends Client> clientClass;

	NetEnum(Class<? extends Server> serverClass, Class<? extends Client> clientClass) {
		this.serverClass = serverClass;
		this.clientClass = clientClass;
	}


}

NettyHttpServer

NettyHttpServer使用Netty作为底层通信框架。注册了4个handler：

  • IdleStateHandler
  • HttpServerCodec
  • HttpObjectAggregator
  • NettyHttpServerHandler
 public void start(final XxlRpcProviderFactory xxlRpcProviderFactory) throws Exception {

        thread = new Thread(new Runnable() {

            @Override
            public void run() {

                // param
                final ThreadPoolExecutor serverHandlerPool = ThreadPoolUtil.makeServerThreadPool(NettyHttpServer.class.getSimpleName());
                EventLoopGroup bossGroup = new NioEventLoopGroup();
                EventLoopGroup workerGroup = new NioEventLoopGroup();

                try {
                    // start server
                    ServerBootstrap bootstrap = new ServerBootstrap();
                    bootstrap.group(bossGroup, workerGroup)
                            .channel(NioServerSocketChannel.class)
                            .childHandler(new ChannelInitializer<SocketChannel>() {
                                @Override
                                public void initChannel(SocketChannel channel) throws Exception {
                                    channel.pipeline()
                                            .addLast(new IdleStateHandler(0, 0, 10, TimeUnit.MINUTES))
                                            .addLast(new HttpServerCodec())
                                            .addLast(new HttpObjectAggregator(5 * 1024 * 1024))  // merge request & reponse to FULL
                                            .addLast(new NettyHttpServerHandler(xxlRpcProviderFactory, serverHandlerPool));
                                }
                            })
                            .childOption(ChannelOption.SO_KEEPALIVE, true);

                    // bind
                    ChannelFuture future = bootstrap.bind(xxlRpcProviderFactory.getPort()).sync();

                    logger.info(">>>>>>>>>>> xxl-rpc remoting server start success, nettype = {}, port = {}", NettyHttpServer.class.getName(), xxlRpcProviderFactory.getPort());
                    onStarted();

                    // wait util stop
                    future.channel().closeFuture().sync();

                } catch (InterruptedException e) {
                    if (e instanceof InterruptedException) {
                        logger.info(">>>>>>>>>>> xxl-rpc remoting server stop.");
                    } else {
                        logger.error(">>>>>>>>>>> xxl-rpc remoting server error.", e);
                    }
                } finally {

                    // stop
                    try {
                        serverHandlerPool.shutdown();	// shutdownNow
                    } catch (Exception e) {
                        logger.error(e.getMessage(), e);
                    }
                    try {
                        workerGroup.shutdownGracefully();
                        bossGroup.shutdownGracefully();
                    } catch (Exception e) {
                        logger.error(e.getMessage(), e);
                    }
                }

            }

        });
        thread.setDaemon(true);	// daemon, service jvm, user thread leave >>> daemon leave >>> jvm leave
        thread.start();
    }

其中NettyHttpServerHandler为xxl-rpc实现的消息处理方法。反序列化请求，处理消息，再序列化响应。以上步骤都由XxlRpcProviderFactory处理。

                // request deserialize
                XxlRpcRequest xxlRpcRequest = (XxlRpcRequest) xxlRpcProviderFactory.getSerializer().deserialize(requestBytes, XxlRpcRequest.class);
                requestId = xxlRpcRequest.getRequestId();

                // invoke + response
                XxlRpcResponse xxlRpcResponse = xxlRpcProviderFactory.invokeService(xxlRpcRequest);

                // response serialize
                byte[] responseBytes = xxlRpcProviderFactory.getSerializer().serialize(xxlRpcResponse);

                // response-write
                writeResponse(ctx, keepAlive, responseBytes);

启动server之后，会触发onStart()事件，通过serviceRegistryClass注册服务。

		server.setStartedCallback(new BaseCallback() {		// serviceRegistry started
			@Override
			public void run() throws Exception {
				// start registry
				if (serviceRegistryClass != null) {
					serviceRegistry = serviceRegistryClass.newInstance();
					serviceRegistry.start(serviceRegistryParam);
					if (serviceData.size() > 0) {
                        //注册服务。
						serviceRegistry.registry(serviceData.keySet(), serviceAddress);
					}
				}
			}
		});

serviceRegistryClass启动一个线程，向Admin（可以是多个管理端）注册服务。


        registryThread = new Thread(new Runnable() {
            @Override
            public void run() {

                // 注册，此处为守护线程，一直不退出。
                while (!toStop) {
                    try {
                        RegistryParam registryParam = new RegistryParam(RegistryConfig.RegistType.EXECUTOR.name(), appName, address);
                        for (AdminBiz adminBiz: XxlJobExecutor.getAdminBizList()) {
                            try {
                                ReturnT<String> registryResult = adminBiz.registry(registryParam);
                                if (registryResult!=null && ReturnT.SUCCESS_CODE == registryResult.getCode()) {
                                    registryResult = ReturnT.SUCCESS;
                                    logger.debug(">>>>>>>>>>> xxl-job registry success, registryParam:{}, registryResult:{}", new Object[]{registryParam, registryResult});
//注册一个AdminBiz就跳出？？看不明白。
                                    break;
                                } else {
                                    logger.info(">>>>>>>>>>> xxl-job registry fail, registryParam:{}, registryResult:{}", new Object[]{registryParam, registryResult});
                                }
                            } catch (Exception e) {
                                logger.info(">>>>>>>>>>> xxl-job registry error, registryParam:{}", registryParam, e);
                            }

                        }
                    } catch (Exception e) {
                        if (!toStop) {
                            logger.error(e.getMessage(), e);
                        }

                    }

                    try {
                        if (!toStop) {
                            //每30秒注册一次，心跳。
                            TimeUnit.SECONDS.sleep(RegistryConfig.BEAT_TIMEOUT);
                        }
                    } catch (InterruptedException e) {
                        if (!toStop) {
                            logger.warn(">>>>>>>>>>> xxl-job, executor registry thread interrupted, error msg:{}", e.getMessage());
                        }
                    }
                }

                //线程停止时，取消注册。
                try {
                    RegistryParam registryParam = new RegistryParam(RegistryConfig.RegistType.EXECUTOR.name(), appName, address);
                    for (AdminBiz adminBiz: XxlJobExecutor.getAdminBizList()) {
                        try {
                            ReturnT<String> registryResult = adminBiz.registryRemove(registryParam);
                            if (registryResult!=null && ReturnT.SUCCESS_CODE == registryResult.getCode()) {
                                registryResult = ReturnT.SUCCESS;
                                logger.info(">>>>>>>>>>> xxl-job registry-remove success, registryParam:{}, registryResult:{}", new Object[]{registryParam, registryResult});
                                break;
                            } else {
                                logger.info(">>>>>>>>>>> xxl-job registry-remove fail, registryParam:{}, registryResult:{}", new Object[]{registryParam, registryResult});
                            }
                        } catch (Exception e) {
                            if (!toStop) {
                                logger.info(">>>>>>>>>>> xxl-job registry-remove error, registryParam:{}", registryParam, e);
                            }

                        }

                    }
                } catch (Exception e) {
                    if (!toStop) {
                        logger.error(e.getMessage(), e);
                    }
                }
                logger.info(">>>>>>>>>>> xxl-job, executor registry thread destory.");

            }
        });

向Admin注册Job，使用AdminBiz的代理实现类，向Admin服务器发送方法。


                    AdminBiz adminBiz = (AdminBiz) new XxlRpcReferenceBean(
                            NetEnum.NETTY_HTTP,
                            serializer,
                            CallType.SYNC,
                            LoadBalance.ROUND,
                            AdminBiz.class,
                            null,
                            3000,
                            addressUrl,
                            accessToken,
                            null,
                            null
                    ).getObject();

	public Object getObject() {
		return Proxy.newProxyInstance(Thread.currentThread()
				.getContextClassLoader(), new Class[] { iface },
				new InvocationHandler() {
					@Override
					public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

........

						// 封装方法调用为request，发送到Admin
						XxlRpcRequest xxlRpcRequest = new XxlRpcRequest();
	                    xxlRpcRequest.setRequestId(UUID.randomUUID().toString());
	                    xxlRpcRequest.setCreateMillisTime(System.currentTimeMillis());
	                    xxlRpcRequest.setAccessToken(accessToken);
	                    xxlRpcRequest.setClassName(className);
	                    xxlRpcRequest.setMethodName(methodName);
	                    xxlRpcRequest.setParameterTypes(parameterTypes);
	                    xxlRpcRequest.setParameters(parameters);
	                    
	                    // 同步，异步，回调方式调用方法。
						if (CallType.SYNC == callType) {
							
						} else if (CallType.FUTURE == callType) {
							

						} else if (CallType.CALLBACK == callType) {

							
						} else if (CallType.ONEWAY == callType) {
                          
                        } else {
							throw new XxlRpcException("xxl-rpc callType["+ callType +"] invalid");
						}

					}
				});
	}

 

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xxl-job: 是一个分布式任务调度平台，核心设计目标是开发迅速、学习简单、轻量级、易扩展。
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