MQTT---HiveMQ源码详解(十)Netty-Statistics

源博客地址:http://blog.csdn.net/pipinet123

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MQTT交流群:221405150

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HiveMQ中的内置的统计非常之多，多到可怕，几乎你能想到的统计hivemq都已经帮你想全了；同时第三方plugin还可以定义属于自己的统计。

它的实现采用了Metric框架实现统计、度量。收集的数据可以通过多种数据报告接口，这样可以监控broker运行中的各种数据来监控broker。

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所谓统计无外乎就是采集埋点、输出报告

采集埋点

类图

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1. 通过StatisticsInitializer实现handlerAdded方法，为pipeline中添加GlobalTrafficCounter(流量计数器)、GlobalMqttMessageCounter(mqtt消息数量计数器)、MqttConnectionCounterHandler(mqtt连接数量计数器)

2. GlobalTrafficCounter继承netty的GlobalTrafficShapingHandler，来获得流量计数器，来统计当前(最后5秒)的读/写流量、累计的读/写流量。

3. GlobalMqttMessageCounter根据当前的mqtt消息类型，来分类统计每种mqtt消息的读/写的数量和吞吐。

4. MqttConnectionCounterHandler通过监听mqtt connect消息以及当前Channel的closeFuture来统计总连接数、当前连接数；MqttConnectionCounter数据细粒度的一个带ReadWriteLock的统计器来为当前连接数提供increase、decrease以及当前连接数、最大连接数查询的类。

这样通过统计的handler对连接、流量、数量进行统计，达到统计埋点，以达到收集broker中的流量信息。
官网还为我们提供了jvm监控插件。
https://github.com/hivemq/jvm-metrics-plugin

输出报告

既然数据已经收集到Metric中，那么输出就相对来说很简单了，而且输出都是属于个性化的需求，hivemq则采用的是plugin的方式来输出报告的,官网为我们提供了几种输出的插件。
1、以$SYS主题发布出去。https://github.com/hivemq/hivemq-sys-topic-plugin
2、输出到influxdb中去。https://github.com/hivemq/influxdb-monitoring-plugin

内置的采集信息列举

下面的列举基本上都是见名知意的，博主就不给大家一一解释了。

    private final Counter incomingMessageCount;    private final Counter outgoingMessageCount;    private final Meter incomingMessageRate;    private final Meter outgoingMessageRate;    private final Meter outgoingConnAckRate;    private final Counter outgoingConnAckCount;    private final Meter incomingConnectRate;    private final Counter incomingConnectCount;    private final Meter incomingDisconnectRate;    private final Counter incomingDisconnectCount;    private final Meter incomingPingReqRate;    private final Counter incomingPingReqCount;    private final Meter outgoingPingRespRate;    private final Counter outgoingPingRespCount;    private final Meter incomingPubAckRate;    private final Counter incomingPubAckCount;    private final Meter outgoingPubAckRate;    private final Counter outgoingPubAckCount;    private final Meter incomingPubCompRate;    private final Counter incomingPubCompCount;    private final Meter outgoingPubCompRate;    private final Counter outgoingPubCompCount;    private final Meter incomingPublishRate;    private final Counter incomingPublishCount;    private final Meter outgoingPublishRate;    private final Counter outgoingPublishCount;    private final Meter incomingPubRecRate;    private final Counter incomingPubRecCount;    private final Meter outgoingPubRecRate;    private final Counter outgoingPubRecCount;    private final Meter incomingPubRelRate;    private final Counter incomingPubRelCount;    private final Meter outgoingPubRelRate;    private final Counter outgoingPubRelCount;    private final Meter outgoingSubAckRate;    private final Counter outgoingSubAckCount;    private final Meter incomingSubscribeRate;    private final Counter incomingSubscribeCount;    private final Meter outgoingUnsubAckRate;    private final Counter outgoingUnsubAckCount;    private final Meter incomingUnsubscribeRate;    private final Counter incomingUnsubscribeCount;    private final Counter halfFullQueueCount;    private final Meter droppedMessageRate;    private final Counter droppedMessageCount;    private final Meter publishQueueRate;    private final Counter publishQueueSize;    private final Counter persistentSessionsActive;    private final Histogram connectionsOverallMean;    private final Histogram incomingMessageSizeMean;    private final Histogram outgoingMessageSizeMean;    private final Histogram incomingPublishSizeMean;    private final Histogram outgoingPublishSizeMean;    private final Histogram retainedMessagesMean;    private final Meter retainedMessagesRate;    private final Counter subscriptionsCurrent;    private final Timer pluginTimerAfterLoginSuccess;    private final Timer pluginTimerAfterLoginFailed;    private final Timer pluginTimerAuthentication;    private final Timer pluginTimerRestrictions;    private final Timer pluginTimerAuthorization;    private final Timer pluginTimerPermissionsDisconnectPublish;    private final Timer pluginTimerPermissionsDisconnectSubscribe;    private final Timer pluginTimerConnect;    private final Timer pluginTimerDisconnect;    private final Timer pluginTimerConnAckSend;    private final Timer pluginTimerPubAckSend;    private final Timer pluginTimerPubAckReceived;    private final Timer pluginTimerPubCompReceived;    private final Timer pluginTimerPublishReceived;    private final Timer pluginTimerPublishSend;    private final Timer pluginTimerSubscribe;    private final Timer pluginTimerUnsubscribe;    private final Timer pluginTimerPing;    private final Timer pluginTimerPubRelReceived;    private final Timer pluginTimerPubRecReceived;    private final Timer pluginTimerPubCompSend;    private final Timer pluginTimerPubRecSend;    private final Timer pluginTimerPubRelSend;    private final Timer pluginTimerSubAckSend;    private final Timer pluginTimerUnsubAckSend;    private final Meter totalExceptionRate;