graylog 啓動流程

啓動流程：

Main函數參數： server -f graylog.conf.example

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主要框架：com.github.rvesse.airline，主要將shell命令參數和java類綁定，根據傳參獲取對應類的實例，final Runnable command = cli.parse(args);

然後啓動實例,由於啓動參數是sever，綁定的類是org.graylog2.commands.server

[i]啓動server實例

Server類層級如下：

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運行run啓動該實例，run的邏輯如下

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初始化日誌

//初始化日誌 默認是info
final Level logLevel = setupLogger();

 

獲取plug module，主要有三個

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獲取config module, 有14個。

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//初始化pid文件及netty io.netty.native.workdir配置        

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獲取config module

獲取config module ,其實就是所有的配置類添加NamedConfigParametersModule容器

 

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創建上下文

系統自動注入上面獲取的plugn module 和 config module, 使用的是google的guice 依賴注入框架。框架具體看我的博客：

https://www.baidu.com/link?url=fkBYiMOdue8xayUttrRxWCWk847sFL3fp--VRpuOg6Z6E-FePftH9hTafrZ0V5mFkp9Hqd3Nm9w8FAZ7Wgeu60YNN047UCutIt8qqjJ3o4O&wd=&eqid=d65bc96d00002f64000000025ea4f451

 

依賴注入的類實在是太多，看來項目複雜度還不小，以後有時間可以仔細看看注入的類。

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Guice常見上下文，也就是injector容器，創建所有入住類的實例，並保存在injector,後面需要實例，直接可以通過injector獲取

 

GenericInitializerBindings

啓動jmx

啓動jmxreporter 暴露服務運行metrics， metrics主要使用了

com.codahale.metrics;

 

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啓動service

這個地方使用了google的Guava Service框架，這個框架到處都用，個人覺得是java常用組件的升級版本。

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具體代碼如下

@Override

protected void startCommand() {

    final AuditEventSender auditEventSender = injector.getInstance(AuditEventSender.class);

    final NodeId nodeId = injector.getInstance(NodeId.class);

    final String systemInformation = Tools.getSystemInformation();

    final Map<String, Object> auditEventContext = ImmutableMap.of(

        "version", version.toString(),

        "java", systemInformation,

        "node_id", nodeId.toString()

    );

    auditEventSender.success(AuditActor.system(nodeId), NODE_STARTUP_INITIATE, auditEventContext);

    //獲取操作系統參數

    final OS os = OS.getOs();



    final ServerStatus serverStatus = injector.getInstance(ServerStatus.class);

    //初始化server狀態爲starting

    serverStatus.initialize();

    //

    startNodeRegistration(injector);



    final ActivityWriter activityWriter;

    final ServiceManager serviceManager;

    try {

        activityWriter = injector.getInstance(ActivityWriter.class);

        serviceManager = injector.getInstance(ServiceManager.class);

    } catch (ProvisionException e) {

        LOG.error("Guice error", e);

        annotateProvisionException(e);

        auditEventSender.failure(AuditActor.system(nodeId), NODE_STARTUP_INITIATE, auditEventContext);

        System.exit(-1);

        return;

    } catch (Exception e) {

        LOG.error("Unexpected exception", e);

        auditEventSender.failure(AuditActor.system(nodeId), NODE_STARTUP_INITIATE, auditEventContext);

        System.exit(-1);

        return;

    }

    Runtime.getRuntime().addShutdownHook(new Thread(injector.getInstance(shutdownHook())));

    // propagate default size to input plugins

    MessageInput.setDefaultRecvBufferSize(configuration.getUdpRecvBufferSizes());

    // Start services.

    final ServiceManagerListener serviceManagerListener = injector.getInstance(ServiceManagerListener.class);

    serviceManager.addListener(serviceManagerListener);

    try {

        serviceManager.startAsync().awaitHealthy();

    } catch (Exception e) {

        try {

            serviceManager.stopAsync().awaitStopped(configuration.getShutdownTimeout(), TimeUnit.MILLISECONDS);

        } catch (TimeoutException timeoutException) {

            LOG.error("Unable to shutdown properly on time. {}", serviceManager.servicesByState());

        }

        LOG.error("Graylog startup failed. Exiting. Exception was:", e);

        auditEventSender.failure(AuditActor.system(nodeId), NODE_STARTUP_INITIATE, auditEventContext);

        System.exit(-1);

    }

    LOG.info("Services started, startup times in ms: {}", serviceManager.startupTimes());



    activityWriter.write(new Activity("Started up.", Main.class));

    LOG.info("Graylog " + commandName + " up and running.");

    auditEventSender.success(AuditActor.system(nodeId), NODE_STARTUP_COMPLETE, auditEventContext);



    // Block forever.

    try {

        Thread.currentThread().join();

    } catch (InterruptedException e) {

        return;

    }

}

至此，整個server服務完全啓動，後面可以分析每個具體service了。

 

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