xxl-job執行器的註冊

一、執行器註冊流程

二、具體流程

1.註冊監控執行緒

//類：JobRegistryHelper.java；方法：public void start()
registryMonitorThread = new Thread(new Runnable() {
			@Override
			public void run() {
				while (!toStop) {
					try {
						//獲取自動註冊型執行器
						List<XxlJobGroup> groupList = XxlJobAdminConfig.getAdminConfig().getXxlJobGroupDao().findByAddressType(0);
						if (groupList!=null && !groupList.isEmpty()) {

							//移除註冊中心死亡的地址
							List<Integer> ids = XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().findDead(RegistryConfig.DEAD_TIMEOUT, new Date());
							if (ids!=null && ids.size()>0) {
								XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().removeDead(ids);
							}

							//重新整理註冊中心活躍的地址，並儲存為app和註冊地址列表的對映
							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);
									}
								}
							}

							//重新整理執行器地址
							for (XxlJobGroup group: groupList) {
								List<String> registryList = appAddressMap.get(group.getAppname());
								String addressListStr = null;
								//註冊中心存在活躍的地址則更新為活躍地址，否則更新為空地址
								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);
								group.setUpdateTime(new Date());

								XxlJobAdminConfig.getAdminConfig().getXxlJobGroupDao().update(group);
							}
						}
					} catch (Exception e) {
						if (!toStop) {
							logger.error(">>>>>>>>>>> xxl-job, job registry monitor thread error:{}", e);
						}
					}
					try {
						//睡眠一個心跳超時時間，集訓監控自動註冊型執行器列表
						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");
			}
		});
		registryMonitorThread.setDaemon(true);
		registryMonitorThread.setName("xxl-job, admin JobRegistryMonitorHelper-registryMonitorThread");
		registryMonitorThread.start();

2.註冊過程

1 初始化執行器

//XxlJobExecutor.java
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);
                }
            }
        }
    }

2 執行器端註冊

    public void start(final String appname, final String address){

        //省略部分

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

                // registry
                while (!toStop) {
                    try {
                        RegistryParam registryParam = new RegistryParam(RegistryConfig.RegistType.EXECUTOR.name(), appname, address);
                        for (AdminBiz adminBiz: XxlJobExecutor.getAdminBizList()) {
                            try {
				//選擇一個執行器，發起rpc註冊請求
                                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});
				    //註冊成功則退出迴圈
                                    break;
                                } else {
				    //註冊失敗則列印日誌，嘗試下一個執行器
                                    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) {
			    //睡眠一個心跳超時時間，繼續註冊
                            TimeUnit.SECONDS.sleep(RegistryConfig.BEAT_TIMEOUT);
                        }
                    } catch (InterruptedException e) {
                        if (!toStop) {
                            logger.warn(">>>>>>>>>>> xxl-job, executor registry thread interrupted, error msg:{}", e.getMessage());
                        }
                    }
                }

                //移除註冊部分省略
            }
        });
        registryThread.setDaemon(true);
        registryThread.setName("xxl-job, executor ExecutorRegistryThread");
        registryThread.start();
    }

3 排程中心執行註冊

//JobRegistryHelper.java
public ReturnT<String> registry(RegistryParam registryParam) {

		// valid
		if (!StringUtils.hasText(registryParam.getRegistryGroup())
				|| !StringUtils.hasText(registryParam.getRegistryKey())
				|| !StringUtils.hasText(registryParam.getRegistryValue())) {
			return new ReturnT<String>(ReturnT.FAIL_CODE, "Illegal Argument.");
		}

		//從執行緒池中獲取註冊執行緒執行註冊
		registryOrRemoveThreadPool.execute(new Runnable() {
			@Override
			public void run() {
				//更新註冊結果
				int ret = XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().registryUpdate(registryParam.getRegistryGroup(), registryParam.getRegistryKey(), registryParam.getRegistryValue(), new Date());
				if (ret < 1) {
					//更新失敗則新增註冊結果
					XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().registrySave(registryParam.getRegistryGroup(), registryParam.getRegistryKey(), registryParam.getRegistryValue(), new Date());

					// fresh
					freshGroupRegistryInfo(registryParam);
				}
			}
		});

		return ReturnT.SUCCESS;
	}