心跳的任務封裝在BeatTask這個類中，是一個Runnable，其run方法如下：

@Override public void run() {if (beatInfo.isStopped()) {return;}// 獲取心跳周期long nextTime = beatInfo.getPeriod();try {// 發送心跳JsonNode result = serverProxy.sendBeat(beatInfo, BeatReactor.this.lightBeatEnabled);long interval = result.get("clientBeatInterval").asLong();boolean lightBeatEnabled = false;if (result.has(CommonParams.LIGHT_BEAT_ENABLED)) {lightBeatEnabled = result.get(CommonParams.LIGHT_BEAT_ENABLED).asBoolean();}BeatReactor.this.lightBeatEnabled = lightBeatEnabled;if (interval > 0) {nextTime = interval;}// 判斷心跳結果int code = NamingResponseCode.OK;if (result.has(CommonParams.CODE)) {code = result.get(CommonParams.CODE).asInt();}if (code == NamingResponseCode.RESOURCE_NOT_FOUND) {// 如果失敗，則需要 重新注冊實例Instance instance = new Instance();instance.setPort(beatInfo.getPort());instance.setIp(beatInfo.getIp());instance.setWeight(beatInfo.getWeight());instance.setMetadata(beatInfo.getMetadata());instance.setClusterName(beatInfo.getCluster());instance.setServiceName(beatInfo.getServiceName());instance.setInstanceId(instance.getInstanceId());instance.setEphemeral(true);try {serverProxy.registerService(beatInfo.getServiceName(),NamingUtils.getGroupName(beatInfo.getServiceName()), instance);} catch (Exception ignore) {}}} catch (NacosException ex) {NAMING_LOGGER.error("[CLIENT-BEAT] failed to send beat: {}, code: {}, msg: {}",JacksonUtils.toJson(beatInfo), ex.getErrCode(), ex.getErrMsg());} catch (Exception unknownEx) {NAMING_LOGGER.error("[CLIENT-BEAT] failed to send beat: {}, unknown exception msg: {}",JacksonUtils.toJson(beatInfo), unknownEx.getMessage(), unknownEx);} finally {executorService.schedule(new BeatTask(beatInfo), nextTime, TimeUnit.MILLISECONDS);} }

總結

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