Nacos深入浅出（四）

private void executeAsyncInvoke() {

            while (!queue.isEmpty()) {

                NotifySingleTask task = queue.poll();
                String targetIp = task.getTargetIP();
                if (serverListService.getServerList().contains(
                    targetIp)) {
                    // 启动健康检查且有不监控的ip则直接把放到通知队列，否则通知
                    if (serverListService.isHealthCheck()
                        && ServerListService.getServerListUnhealth().contains(targetIp)) {
                        // target ip 不健康，则放入通知列表中
                        ConfigTraceService.logNotifyEvent(task.getDataId(), task.getGroup(), task.getTenant(), null,
                            task.getLastModified(),
                            LOCAL_IP, ConfigTraceService.NOTIFY_EVENT_UNHEALTH, 0, task.target);
                        // get delay time and set fail count to the task
                        int delay = getDelayTime(task);
                        Queue<NotifySingleTask> queue = new LinkedList<NotifySingleTask>();
                        queue.add(task);
                        AsyncTask asyncTask = new AsyncTask(httpclient, queue);
                        ((ScheduledThreadPoolExecutor)EXCUTOR).schedule(asyncTask, delay, TimeUnit.MILLISECONDS);
                    } else {
                        HttpGet request = new HttpGet(task.url);
                        request.setHeader(NotifyService.NOTIFY_HEADER_LAST_MODIFIED,
                            String.valueOf(task.getLastModified()));
                        request.setHeader(NotifyService.NOTIFY_HEADER_OP_HANDLE_IP, LOCAL_IP);
                        if (task.isBeta) {
                            request.setHeader("isBeta", "true");
                        }
                        httpclient.execute(request, new AyscNotifyCallBack(httpclient, task));
                    }
                }
            }
        }

request中的内容debug出来

http://10.129.13.96:8848/nacos/v1/cs/communication/dataChange?dataId=springboot2-nacos-config&group=DEFAULT_GROUP

 这里又发了一个请求出去，跳转到/communication/dataChange这个里面去，继续跟进，

这个请求转发到

CommunicationController.java中来了

/**
     * 通知配置信息改变
     */
    @RequestMapping(value = "/dataChange", method = RequestMethod.GET)
    @ResponseBody
    public Boolean notifyConfigInfo(HttpServletRequest request, HttpServletResponse response,
                                    @RequestParam("dataId") String dataId, @RequestParam("group") String group,
                                    @RequestParam(value = "tenant", required = false, defaultValue = StringUtils.EMPTY)
                                        String tenant,
                                    @RequestParam(value = "tag", required = false) String tag) {
        dataId = dataId.trim();
        group = group.trim();
        String lastModified = request.getHeader(NotifyService.NOTIFY_HEADER_LAST_MODIFIED);
        long lastModifiedTs = StringUtils.isEmpty(lastModified) ? -1 : Long.parseLong(lastModified);
        String handleIp = request.getHeader(NotifyService.NOTIFY_HEADER_OP_HANDLE_IP);
        String isBetaStr = request.getHeader("isBeta");
        if (StringUtils.isNotBlank(isBetaStr) && trueStr.equals(isBetaStr)) {
            dumpService.dump(dataId, group, tenant, lastModifiedTs, handleIp, true);
        } else {
            dumpService.dump(dataId, group, tenant, tag, lastModifiedTs, handleIp);
        }
        return true;
    }

 TaskManager.java

/**
     * 将任务加入到任务Map中
     *
     * @param type
     * @param task
     */
    public void addTask(String type, AbstractTask task) {
        this.lock.lock();
        try {
            AbstractTask oldTask = tasks.put(type, task);
            MetricsMonitor.getDumpTaskMonitor().set(tasks.size());
            if (null != oldTask) {
                task.merge(oldTask);
            }
        } finally {
            this.lock.unlock();
        }
    }

task具体内容如下

这目前为止，Nacos的整个思路就是把每一个需要通知的操作，封装成一个task,直接把这个task扔到一个队列里面去，然后这个队列在不断的循环去poll,

只要队列里面有东西，就去执行这个task对应的processor;

TaskManager.java
这个类就是我们最终的处理类，真正去做通知更新的管理类，上代码，这里就不贴整个类了，局部展示，

public final class TaskManager implements TaskManagerMBean {

    class ProcessRunnable implements Runnable {

        public void run() {
            while (!TaskManager.this.closed.get()) {
                try {
                    Thread.sleep(100);
                    TaskManager.this.process();
                } catch (Throwable e) {
                }
            }

        }

    }

这里面起了一个线程，只要没有关闭，就死循环去执行process；

 protected void process() {
        for (Map.Entry<String, AbstractTask> entry : this.tasks.entrySet()) {
            AbstractTask task = null;
            this.lock.lock();
            try {
                // 获取任务
                task = entry.getValue();
                if (null != task) {
                    if (!task.shouldProcess()) {
                        // 任务当前不需要被执行，直接跳过
                        continue;
                    }
                    // 先将任务从任务Map中删除
                    this.tasks.remove(entry.getKey());
                    MetricsMonitor.getDumpTaskMonitor().set(tasks.size());
                }
            } finally {
                this.lock.unlock();
            }

            if (null != task) {
                // 获取任务处理器
                TaskProcessor processor = this.taskProcessors.get(entry.getKey());
                if (null == processor) {
                    // 如果没有根据任务类型设置的处理器，使用默认处理器
                    processor = this.getDefaultTaskProcessor();
                }
                if (null != processor) {
                    boolean result = false;
                    try {
                        // 处理任务
                        result = processor.process(entry.getKey(), task);
                    } catch (Throwable t) {
                        log.error("task_fail", "处理task失败", t);
                    }
                    if (!result) {
                        // 任务处理失败，设置最后处理时间
                        task.setLastProcessTime(System.currentTimeMillis());

                        // 将任务重新加入到任务Map中
                        this.addTask(entry.getKey(), task);
                    }
                }
            }
        }

重点！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！

class DumpProcessor implements TaskProcessor {

    DumpProcessor(DumpService dumpService) {
        this.dumpService = dumpService;
    }

    @Override
    public boolean process(String taskType, AbstractTask task) {
        DumpTask dumpTask = (DumpTask)task;
        String[] pair = GroupKey2.parseKey(dumpTask.groupKey);
        String dataId = pair[0];
        String group = pair[1];
        String tenant = pair[2];
        long lastModified = dumpTask.lastModified;
        String handleIp = dumpTask.handleIp;
        boolean isBeta = dumpTask.isBeta;
        String tag = dumpTask.tag;
        if (isBeta) {
            // beta发布，则dump数据，更新beta缓存
            ConfigInfo4Beta cf = dumpService.persistService.findConfigInfo4Beta(dataId, group, tenant);
            boolean result;
            if (null != cf) {
                result = ConfigService.dumpBeta(dataId, group, tenant, cf.getContent(), lastModified, cf.getBetaIps());
                if (result) {
                    ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                        ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
                        cf.getContent().length());
                }
            } else {
                result = ConfigService.removeBeta(dataId, group, tenant);
                if (result) {
                    ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                        ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
                }
            }
            return result;
        } else {
            if (StringUtils.isBlank(tag)) {
                ConfigInfo cf = dumpService.persistService.findConfigInfo(dataId, group, tenant);
                if (dataId.equals(AggrWhitelist.AGGRIDS_METADATA)) {
                    if (null != cf) {
                        AggrWhitelist.load(cf.getContent());
                    } else {
                        AggrWhitelist.load(null);
                    }
                }

                if (dataId.equals(ClientIpWhiteList.CLIENT_IP_WHITELIST_METADATA)) {
                    if (null != cf) {
                        ClientIpWhiteList.load(cf.getContent());
                    } else {
                        ClientIpWhiteList.load(null);
                    }
                }

                if (dataId.equals(SwitchService.SWITCH_META_DATAID)) {
                    if (null != cf) {
                        SwitchService.load(cf.getContent());
                    } else {
                        SwitchService.load(null);
                    }
                }

                boolean result;
                if (null != cf) {
                    result = ConfigService.dump(dataId, group, tenant, cf.getContent(), lastModified);

                    if (result) {
                        ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                            ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
                            cf.getContent().length());
                    }
                } else {
                    result = ConfigService.remove(dataId, group, tenant);

                    if (result) {
                        ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                            ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
                    }
                }
                return result;
            } else {
                ConfigInfo4Tag cf = dumpService.persistService.findConfigInfo4Tag(dataId, group, tenant, tag);
                //
                boolean result;
                if (null != cf) {
                    result = ConfigService.dumpTag(dataId, group, tenant, tag, cf.getContent(), lastModified);
                    if (result) {
                        ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                            ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
                            cf.getContent().length());
                    }
                } else {
                    result = ConfigService.removeTag(dataId, group, tenant, tag);
                    if (result) {
                        ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
                            ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
                    }
                }
                return result;
            }
        }

    }

    final DumpService dumpService;
}

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