Nacos micro distribution center serving the source code parsing (b)

Nacos Configuration Center parse the source code

Source entrance

ConfigFactory.createConfigService

ConfigService configService = NacosFactory.createConfigService(properties);
String  content = configService.getConfig(dataId,groupId,3000);

Factory construction by ConfigService

Decorator MetricsHttpAgent package http requests, increase monitoring

agent-> http proxy way to initiate a request clientWorker -> specific work-related

NacosConfigService.NacosConfigService

this.agent = new MetricsHttpAgent(new ServerHttpAgent(properties));
this.agent.start();
this.worker = new ClientWorker(this.agent, this.configFilterChainManager, properties);

• The agency created a httpAgent -> http request initiated

• We created a clientWorker-> asynchronous thread (cron job)

this.executor.scheduleWithFixedDelay(new Runnable() {
    public void run() {
        try {
            ClientWorker.this.checkConfigInfo();
       } catch (Throwable var2) {
            ClientWorker.LOGGER.error("[" + agent.getName() + "] [sub-check] rotate check error", var2);
       }
​
   }
}, 1L, 10L, TimeUnit.MILLISECONDS);

How many requests to do long polling?

Batch processing

public void checkConfigInfo() {
    //分任务
    int listenerSize = ((Map)this.cacheMap.get()).size();
    //向上取整
    int longingTaskCount = (int)Math.ceil((double)listenerSize / ParamUtil.getPerTaskConfigSize());
    if ((double)longingTaskCount > this.currentLongingTaskCount) {
        for(int i = (int)this.currentLongingTaskCount; i < longingTaskCount; ++i) { 
            // To determine whether or not to perform this task need to think about the task list is now a disorderly process of change may be a problem 
            the this. ExecutorService. the Execute ( new new ClientWorker. LongPollingRunnable ( i)); 
       } . the this currentLongingTaskCount = ( Double) longingTaskCount;    } }

        

Check the local configuration monitor -> 

Check cache MD5

Check the updated file

ClientWorker.this.checkLocalConfig(cacheData);
if (cacheData.isUseLocalConfigInfo()) {
    cacheData.checkListenerMd5();
}

Check the remote

List<String> changedGroupKeys = ClientWorker.this.checkUpdateDataIds(cacheDatas, inInitializingCacheList);
Iterator var16 = changedGroupKeys.iterator();

groupId + dataId + tenant remotely check

ClientWorker.this.getServerConfig(dataId, group, tenant, 3000L);

void checkListenerMd5() {
    Iterator var1 = this.listeners.iterator();
​
    while(var1.hasNext()) {
        ManagerListenerWrap wrap = (ManagerListenerWrap)var1.next();
        if (!this.md5.equals(wrap.lastCallMd5)) {
            this.safeNotifyListener(this.dataId, this.group, this.content, this.md5, wrap);
       }
   }
​
}

Get Configuration

Get to go to a local, if not go to take remote configuration

content = LocalConfigInfoProcessor.getFailover(this.agent.getName(), dataId, group, tenant);
if (content != null) {
    cr.setContent(content);
} else {
        content = this.worker.getServerConfig(dataId, group, tenant, timeoutMs);
       
}