概述
执行器注册包括注册和删除
注：源码版本2.3
注册过程
执行器创建是以XxlJobSpringExecutor开始。现在看下
下面是官方给的demo
@Configuration
public class XxlJobConfig {
private Logger logger = LoggerFactory.getLogger(XxlJobConfig.class);
@Value("${xxl.job.admin.addresses}")
private String adminAddresses;
@Value("${xxl.job.accessToken}")
private String accessToken;
@Value("${xxl.job.executor.appname}")
private String appname;
@Value("${xxl.job.executor.address}")
private String address;
@Value("${xxl.job.executor.ip}")
private String ip;
@Value("${xxl.job.executor.port}")
private int port;
@Value("${xxl.job.executor.logpath}")
private String logPath;
@Value("${xxl.job.executor.logretentiondays}")
private int logRetentionDays;
@Bean
public XxlJobSpringExecutor xxlJobExecutor() {
logger.info(">>>>>>>>>>> xxl-job config init.");
XxlJobSpringExecutor xxlJobSpringExecutor = new XxlJobSpringExecutor();
xxlJobSpringExecutor.setAdminAddresses(adminAddresses);
xxlJobSpringExecutor.setAppname(appname);
xxlJobSpringExecutor.setAddress(address);
xxlJobSpringExecutor.setIp(ip);
xxlJobSpringExecutor.setPort(port);
xxlJobSpringExecutor.setAccessToken(accessToken);
xxlJobSpringExecutor.setLogPath(logPath);
xxlJobSpringExecutor.setLogRetentionDays(logRetentionDays);
return xxlJobSpringExecutor;
}
}在Configuration中创建XxlJobSpringExecutor Bean，在看下XxlJobSpringExecutor源码
先看下类的定义
public class XxlJobSpringExecutor extends XxlJobExecutor implements ApplicationContextAware, SmartInitializingSingleton, DisposableBean分别继承了XxlJobExecutor、ApplicationContextAware、SmartInitializingSingleton、DisposableBean 几个类，这些都是spring 管理声明周期的相关的接口
XxlJobExecutor
是执行器XxlJobSpringExecutor父类。包括主要包括了执行器的生命周期管理。
ApplicationContextAware
获取ApplicationContext对象，从而可以获取spring bean。这里主要目的是获取任务类型为BEAN模式的Handler
SmartInitializingSingleton
Spring bean初始化接口
DisposableBean
Spring bean 销毁接口，这里的逻辑是停止服务。停止注册等
创建成功XxlJobSpringExecutor bean后会调用SmartInitializingSingleton.afterSingletonsInstantiated方法。免去显示调用初始化方法
// start
@Override
public void afterSingletonsInstantiated() {
//初始化Job handler
initJobHandlerMethodRepository(applicationContext);
// refresh GlueFactory
GlueFactory.refreshInstance(1);
try {
// 调用XxlJobExecutor.start方法。创建EmbedServer
super.start();
} catch (Exception e) {
throw new RuntimeException(e);
}
}先看initJobHandlerMethodRepository 方法。
private void initJobHandlerMethodRepository(ApplicationContext applicationContext) {
if (applicationContext == null) {
return;
}
// 获取所有的bean对象
String[] beanDefinitionNames = applicationContext.getBeanNamesForType(Object.class, false, true);
for (String beanDefinitionName : beanDefinitionNames) {
Object bean = applicationContext.getBean(beanDefinitionName);
Map<Method, XxlJob> annotatedMethods = null; // referred to ：org.springframework.context.event.EventListenerMethodProcessor.processBean
try {
//找到@XxlJob注解的方法放到annotatedMethods map中
annotatedMethods = MethodIntrospector.selectMethods(bean.getClass(),
new MethodIntrospector.MetadataLookup<XxlJob>() {
@Override
public XxlJob inspect(Method method) {
return AnnotatedElementUtils.findMergedAnnotation(method, XxlJob.class);
}
});
} catch (Throwable ex) {
logger.error("xxl-job method-jobhandler resolve error for bean[" + beanDefinitionName + "].", ex);
}
if (annotatedMethods==null || annotatedMethods.isEmpty()) {
continue;
}
//遍历annotatedMethods
for (Map.Entry<Method, XxlJob> methodXxlJobEntry : annotatedMethods.entrySet()) {
Method method = methodXxlJobEntry.getKey();
XxlJob xxlJob = methodXxlJobEntry.getValue();
if (xxlJob == null) {
continue;
}
String name = xxlJob.value();
if (name.trim().length() == 0) {
throw new RuntimeException("xxl-job method-jobhandler name invalid, for[" + bean.getClass() + "#" + method.getName() + "] .");
}
if (loadJobHandler(name) != null) {
throw new RuntimeException("xxl-job jobhandler[" + name + "] naming conflicts.");
}
// execute method
if (!(method.getParameterTypes().length == 1 && method.getParameterTypes()[0].isAssignableFrom(String.class))) {
throw new RuntimeException("xxl-job method-jobhandler param-classtype invalid, for[" + bean.getClass() + "#" + method.getName() + "] , " +
"The correct method format like \" public ReturnT<String> execute(String param) \" .");
}
if (!method.getReturnType().isAssignableFrom(ReturnT.class)) {
throw new RuntimeException("xxl-job method-jobhandler return-classtype invalid, for[" + bean.getClass() + "#" + method.getName() + "] , " +
"The correct method format like \" public ReturnT<String> execute(String param) \" .");
}
method.setAccessible(true);
// 找到init 和destroy方法。如果在@XXLJOBz中配置的有
Method initMethod = null;
Method destroyMethod = null;
if (xxlJob.init().trim().length() > 0) {
try {
initMethod = bean.getClass().getDeclaredMethod(xxlJob.init());
initMethod.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException("xxl-job method-jobhandler initMethod invalid, for[" + bean.getClass() + "#" + method.getName() + "] .");
}
}
if (xxlJob.destroy().trim().length() > 0) {
try {
destroyMethod = bean.getClass().getDeclaredMethod(xxlJob.destroy());
destroyMethod.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException("xxl-job method-jobhandler destroyMethod invalid, for[" + bean.getClass() + "#" + method.getName() + "] .");
}
}
// 创建MethodJobHandler对象放到map中。便于后续任务执行时调用。
registJobHandler(name, new MethodJobHandler(bean, method, initMethod, destroyMethod));
}
}
}主要逻辑是在获取所有Bean对象，找到加了@XxlJob注解方法。同时找到init和destroy方法。创建MethodJobHandler对象。构造参数分别是执行方法，初始化方法，销毁方法。将MethodJobHandler最为value,加了@XxlJob注解value作为key缓存在jobHandlerRepository 的ConcurrentMap对象里。
registJobHandler 方法逻辑很简单，就是放到ConcurrentMap中。这个的用处在创建任务，触发任务时使用。
private static ConcurrentMap<String, IJobHandler> jobHandlerRepository = new ConcurrentHashMap<String, IJobHandler>();
public static IJobHandler registJobHandler(String name, IJobHandler jobHandler){
logger.info(">>>>>>>>>>> xxl-job register jobhandler success, name:{}, jobHandler:{}", name, jobHandler);
return jobHandlerRepository.put(name, jobHandler);
}再看 super.start();是调用的父类XxlJobExecutor方法。
XxlJobExecutor.start()
public void start() throws Exception {
// 初始化日志目录
XxlJobFileAppender.initLogPath(logPath);
//初始化服务端调用
initAdminBizList(adminAddresses, accessToken);
// 清理日志线程，主要是删除xxl_job_log日志
JobLogFileCleanThread.getInstance().start(logRetentionDays);
// 触发回调线程
TriggerCallbackThread.getInstance().start();
// 初始化EmbedServer。
initEmbedServer(address, ip, port, appname, accessToken);先来一个个看
XxlJobFileAppender.initLogPath(logPath);
这个比较简单就是创建日志目录，记录执行任务日志。
initAdminBizList(adminAddresses, accessToken); 创建admin服务端对象。adminAddresses可以配置多个调度中心地址，每个地址作为AdminBiz对象。实现比较简单就是创建AdminBiz对象，放到adminBizList集合中。
private static List<AdminBiz> adminBizList;
private void initAdminBizList(String adminAddresses, String accessToken) throws Exception {
if (adminAddresses!=null && adminAddresses.trim().length()>0) {
for (String address: adminAddresses.trim().split(",")) {
if (address!=null && address.trim().length()>0) {
AdminBiz adminBiz = new AdminBizClient(address.trim(), accessToken);
if (adminBizList == null) {
adminBizList = new ArrayList<AdminBiz>();
}
adminBizList.add(adminBiz);
}
}
}
}adminBizList主要是在ExecutorRegistryThread线程中使用。执行器依次注册到调度中心。
再来看 JobLogFileCleanThread.getInstance().start(logRetentionDays); 在start方法中启动一个后台线程，删除过期日志
public void start(final long logRetentionDays){
// limit min value
if (logRetentionDays < 3 ) {
return;
}
localThread = new Thread(new Runnable() {
@Override
public void run() {
while (!toStop) {
try {
// clean log dir, over logRetentionDays
File[] childDirs = new File(XxlJobFileAppender.getLogPath()).listFiles();
if (childDirs!=null && childDirs.length>0) {
// today
Calendar todayCal = Calendar.getInstance();
todayCal.set(Calendar.HOUR_OF_DAY,0);
todayCal.set(Calendar.MINUTE,0);
todayCal.set(Calendar.SECOND,0);
todayCal.set(Calendar.MILLISECOND,0);
Date todayDate = todayCal.getTime();
for (File childFile: childDirs) {
// valid
if (!childFile.isDirectory()) {
continue;
}
if (childFile.getName().indexOf("-") == -1) {
continue;
}
// file create date
Date logFileCreateDate = null;
try {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
logFileCreateDate = simpleDateFormat.parse(childFile.getName());
} catch (ParseException e) {
logger.error(e.getMessage(), e);
}
if (logFileCreateDate == null) {
continue;
}
//删除logRetentionDays后的日志
if ((todayDate.getTime()-logFileCreateDate.getTime()) >= logRetentionDays * (24 * 60 * 60 * 1000) ) {
FileUtil.deleteRecursively(childFile);
}
}
}
} catch (Exception e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
try {
TimeUnit.DAYS.sleep(1);
} catch (InterruptedException e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
}
logger.info(">>>>>>>>>>> xxl-job, executor JobLogFileCleanThread thread destory.");
}
});
localThread.setDaemon(true);
localThread.setName("xxl-job, executor JobLogFileCleanThread");
localThread.start();
}再来看 TriggerCallbackThread.getInstance().start(); 任务执行完成后回调改线程。通过远程调用最终会调用XxlJobCompleter完成任务的收尾工作。
public void start() {
// valid
if (XxlJobExecutor.getAdminBizList() == null) {
logger.warn(">>>>>>>>>>> xxl-job, executor callback config fail, adminAddresses is null.");
return;
}
// callback
triggerCallbackThread = new Thread(new Runnable() {
@Override
public void run() {
// normal callback
while(!toStop){
try {
HandleCallbackParam callback = getInstance().callBackQueue.take();
if (callback != null) {
// callback list param
List<HandleCallbackParam> callbackParamList = new ArrayList<HandleCallbackParam>();
int drainToNum = getInstance().callBackQueue.drainTo(callbackParamList);
callbackParamList.add(callback);
// callback, will retry if error
if (callbackParamList!=null && callbackParamList.size()>0) {
doCallback(callbackParamList);
}
}
} catch (Exception e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
}
// last callback
try {
List<HandleCallbackParam> callbackParamList = new ArrayList<HandleCallbackParam>();
int drainToNum = getInstance().callBackQueue.drainTo(callbackParamList);
if (callbackParamList!=null && callbackParamList.size()>0) {
doCallback(callbackParamList);
}
} catch (Exception e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
logger.info(">>>>>>>>>>> xxl-job, executor callback thread destory.");
}
});
triggerCallbackThread.setDaemon(true);
triggerCallbackThread.setName("xxl-job, executor TriggerCallbackThread");
triggerCallbackThread.start();
// retry
triggerRetryCallbackThread = new Thread(new Runnable() {
@Override
public void run() {
while(!toStop){
try {
retryFailCallbackFile();
} catch (Exception e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
try {
TimeUnit.SECONDS.sleep(RegistryConfig.BEAT_TIMEOUT);
} catch (InterruptedException e) {
if (!toStop) {
logger.error(e.getMessage(), e);
}
}
}
logger.info(">>>>>>>>>>> xxl-job, executor retry callback thread destory.");
}
});
triggerRetryCallbackThread.setDaemon(true);
triggerRetryCallbackThread.start();
}接下来就是初始化 initEmbedServer(address, ip, port, appname, accessToken);在XxlJobExecutor.initEmbedServer方法中。
private void initEmbedServer(String address, String ip, int port, String appname, String accessToken) throws Exception {
// 设置端口，没有配置就默认设置9999
port = port>0?port: NetUtil.findAvailablePort(9999);
ip = (ip!=null&&ip.trim().length()>0)?ip: IpUtil.getIp();
// 生产执行器地址
if (address==null || address.trim().length()==0) {
String ip_port_address = IpUtil.getIpPort(ip, port); // registry-address：default use address to registry , otherwise use ip:port if address is null
address = "http://{ip_port}/".replace("{ip_port}", ip_port_address);
}
// accessToken
if (accessToken==null || accessToken.trim().length()==0) {
logger.warn(">>>>>>>>>>> xxl-job accessToken is empty. To ensure system security, please set the accessToken.");
}
//启动执行器服务
embedServer = new EmbedServer();
embedServer.start(address, port, appname, accessToken);
}来窥探下EmbedServer的start方法。
public void start(final String address, final int port, final String appname, final String accessToken) {
executorBiz = new ExecutorBizImpl();
thread = new Thread(new Runnable() {
@Override
public void run() {
// param
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
ThreadPoolExecutor bizThreadPool = new ThreadPoolExecutor(
0,
200,
60L,
TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(2000),
new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "xxl-rpc, EmbedServer bizThreadPool-" + r.hashCode());
}
},
new RejectedExecutionHandler() {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
throw new RuntimeException("xxl-job, EmbedServer bizThreadPool is EXHAUSTED!");
}
});
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, 30 * 3, TimeUnit.SECONDS)) // beat 3N, close if idle
.addLast(new HttpServerCodec())
.addLast(new HttpObjectAggregator(5 * 1024 * 1024)) // merge request & reponse to FULL
.addLast(new EmbedHttpServerHandler(executorBiz, accessToken, bizThreadPool));
}
})
.childOption(ChannelOption.SO_KEEPALIVE, true);
// bind
ChannelFuture future = bootstrap.bind(port).sync();
logger.info(">>>>>>>>>>> xxl-job remoting server start success, nettype = {}, port = {}", EmbedServer.class, port);
// start registry
startRegistry(appname, address);
// wait util stop
future.channel().closeFuture().sync();
} catch (InterruptedException e) {
if (e instanceof InterruptedException) {
logger.info(">>>>>>>>>>> xxl-job remoting server stop.");
} else {
logger.error(">>>>>>>>>>> xxl-job remoting server error.", e);
}
} finally {
// stop
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();
}看到EventLoopGroup是不是很熟悉，这就是Netty server的。创建了一个最大支持200个线程的线程池。
再看pipeline，添加了IdleStateHandler、HttpServerCodec、HttpObjectAggregator，EmbedHttpServerHandler 这几个handler
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, 30 * 3, TimeUnit.SECONDS)) // beat 3N, close if idle
.addLast(new HttpServerCodec())
.addLast(new HttpObjectAggregator(5 * 1024 * 1024)) // merge request & reponse to FULL
.addLast(new EmbedHttpServerHandler(executorBiz, accessToken, bizThreadPool));
}
})
.childOption(ChannelOption.SO_KEEPALIVE, true);IdleStateHandler 是处理心跳的。
HttpServerCodec 是Http编码的
HttpObjectAggregator 也是处理http请求的。
EmbedHttpServerHandler 是自定义的。
EmbedHttpServerHandler 主要是处理调度中心的请求，真正做让执行器执行任务逻辑就在这里面，包括运行任务‘终止任务、查看日志事件。
@Override
protected void channelRead0(final ChannelHandlerContext ctx, FullHttpRequest msg) throws Exception {
// request parse
//final byte[] requestBytes = ByteBufUtil.getBytes(msg.content()); // byteBuf.toString(io.netty.util.CharsetUtil.UTF_8);
String requestData = msg.content().toString(CharsetUtil.UTF_8);
String uri = msg.uri();
HttpMethod httpMethod = msg.method();
boolean keepAlive = HttpUtil.isKeepAlive(msg);
String accessTokenReq = msg.headers().get(XxlJobRemotingUtil.XXL_JOB_ACCESS_TOKEN);
// invoke
bizThreadPool.execute(new Runnable() {
@Override
public void run() {
//处理调度中心发出的请求
Object responseObj = process(httpMethod, uri, requestData, accessTokenReq);
// 将请求返回转换成json字符串
String responseJson = GsonTool.toJson(responseObj);
// 结果写会到响应中。
writeResponse(ctx, keepAlive, responseJson);
}
});
}再看process方法。
private Object process(HttpMethod httpMethod, String uri, String requestData, String accessTokenReq) {
// 只是接受post请求
if (HttpMethod.POST != httpMethod) {
return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, HttpMethod not support.");
}
if (uri==null || uri.trim().length()==0) {
return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, uri-mapping empty.");
}
if (accessToken!=null
&& accessToken.trim().length()>0
&& !accessToken.equals(accessTokenReq)) {
return new ReturnT<String>(ReturnT.FAIL_CODE, "The access token is wrong.");
}
//通过uri 类型执行相应的逻辑
try {
if ("/beat".equals(uri)) {
return executorBiz.beat();
} else if ("/idleBeat".equals(uri)) {
IdleBeatParam idleBeatParam = GsonTool.fromJson(requestData, IdleBeatParam.class);
return executorBiz.idleBeat(idleBeatParam);
} else if ("/run".equals(uri)) {
//运行任务
TriggerParam triggerParam = GsonTool.fromJson(requestData, TriggerParam.class);
return executorBiz.run(triggerParam);
} else if ("/kill".equals(uri)) {
//终止任务
KillParam killParam = GsonTool.fromJson(requestData, KillParam.class);
return executorBiz.kill(killParam);
} else if ("/log".equals(uri)) {
//查看任务日志
LogParam logParam = GsonTool.fromJson(requestData, LogParam.class);
return executorBiz.log(logParam);
} else {
return new ReturnT<String>(ReturnT.FAIL_CODE, "invalid request, uri-mapping("+ uri +") not found.");
}
} catch (Exception e) {
logger.error(e.getMessage(), e);
return new ReturnT<String>(ReturnT.FAIL_CODE, "request error:" + ThrowableUtil.toString(e));
}
}执行逻辑在ExecutorBizImpl类中。本节不详细描述
这里要说明一下。执行器启动成功后，会定时想调度中心注册自己。表示我还活在可用。这里逻辑在ExecutorRegistryThread线程中。启动该线程是在EmbedServer.start中调用。
public void start(final String appname, final String address){
registryThread = new Thread(new Runnable() {
@Override
public void run() {
// 主要逻辑就是将注册续期到调度中心集合中。
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});
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) {
TimeUnit.SECONDS.sleep(RegistryConfig.BEAT_TIMEOUT);
}
} catch (InterruptedException e) {
if (!toStop) {
logger.warn(">>>>>>>>>>> xxl-job, executor registry thread interrupted, error msg:{}", e.getMessage());
}
}
}
//执行器停止服务，删除注册信息。
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);
}
}
}
});
registryThread.setDaemon(true);
registryThread.setName("xxl-job, executor ExecutorRegistryThread");
registryThread.start();
}好了。执行器端注册和取消注册源码介绍完毕。
现在看下调度中心怎么处理，调度中心主要是检查执行器是否需求，没有需求就主动删除执行器信息。
主要代码逻辑在JobRegistryHelper中。 找到在DEAD_TIMEOUT没有续期的执行器，也就是用xxl_job_registry的update_time和当前时间比较，大于DEAD_TIMEOUT说明，执行器有一段时间没有续期更新了，需要删除其信息。删除注册信后还要更新执行器的addresslist的执行器地址。删除下线的执行器，再更新回去xxl_job_group。
public void start(){
registryThread = new Thread(new Runnable() {
@Override
public void run() {
while (!toStop) {
try {
// 找到自动注册的执行器
List<XxlJobGroup> groupList = XxlJobAdminConfig.getAdminConfig().getXxlJobGroupDao().findByAddressType(0);
if (groupList!=null && !groupList.isEmpty()) {
// 找到在DEAD_TIMEOUT没有续期的执行器，对应表xxl_job_registry
List<Integer> ids = XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().findDead(RegistryConfig.DEAD_TIMEOUT, new Date());
if (ids!=null && ids.size()>0) {
//删除执行器注册信息
XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().removeDead(ids);
}
// 去掉执行器组的addresslist的地址信息。对应表xxl_job_group
HashMap<String, List<String>> appAddressMap = new HashMap<String, List<String>>();
List<XxlJobRegistry> list = XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().findAll(RegistryConfig.DEAD_TIMEOUT, new Date());
if (list != null) {
for (XxlJobRegistry item: list) {
if (RegistryConfig.RegistType.EXECUTOR.name().equals(item.getRegistryGroup())) {
String appname = item.getRegistryKey();
List<String> registryList = appAddressMap.get(appname);
if (registryList == null) {
registryList = new ArrayList<String>();
}
if (!registryList.contains(item.getRegistryValue())) {
registryList.add(item.getRegistryValue());
}
appAddressMap.put(appname, registryList);
}
}
}
// fresh group address
for (XxlJobGroup group: groupList) {
List<String> registryList = appAddressMap.get(group.getAppname());
String addressListStr = null;
if (registryList!=null && !registryList.isEmpty()) {
Collections.sort(registryList);
StringBuilder addressListSB = new StringBuilder();
for (String item:registryList) {
addressListSB.append(item).append(",");
}
addressListStr = addressListSB.toString();
addressListStr = addressListStr.substring(0, addressListStr.length()-1);
}
group.setAddressList(addressListStr);
XxlJobAdminConfig.getAdminConfig().getXxlJobGroupDao().update(group);
}
}
} catch (Exception e) {
if (!toStop) {
logger.error(">>>>>>>>>>> xxl-job, job registry monitor thread error:{}", e);
}
}
try {
TimeUnit.SECONDS.sleep(RegistryConfig.BEAT_TIMEOUT);
} catch (InterruptedException e) {
if (!toStop) {
logger.error(">>>>>>>>>>> xxl-job, job registry monitor thread error:{}", e);
}
}
}
logger.info(">>>>>>>>>>> xxl-job, job registry monitor thread stop");
}
});
registryThread.setDaemon(true);
registryThread.setName("xxl-job, admin JobRegistryMonitorHelper");
registryThread.start();
}
以上就是执行器的注册和取消注册流程。
总结
总结一下：
1）执行器启动时注册到调度中心，同时启动一个线程定时注册续期到调度中心。
2）调度中心启动一个线程，定时查看xxl_job_registry表的注册信息，如果再指定时间内执行器没有续期就判断为下线，需要删除执行器信息，同时要更新执行列表的执行地址列表器addresslist 。