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探究springboot中的TomcatMetricsBinder

作者：hello_ejb3

springboot的TomcatMetricsBinder主要是接收ApplicationStartedEvent然后创建TomcatMetrics执行bindTo进行注册,TomcatMetrics主要注册了globalRequest、servlet、cache、threadPool、session相关的指标,本文给大家介绍的非常详细,需要的朋友参考下吧

序

本文主要研究一下springboot的TomcatMetricsBinder

TomcatMetricsAutoConfiguration

org/springframework/boot/actuate/autoconfigure/metrics/web/tomcat/TomcatMetricsAutoConfiguration.java

@Configuration(proxyBeanMethods = false)
@ConditionalOnWebApplication
@ConditionalOnClass({ TomcatMetrics.class, Manager.class })
@AutoConfigureAfter(CompositeMeterRegistryAutoConfiguration.class)
public class TomcatMetricsAutoConfiguration {
	@Bean
	@ConditionalOnBean(MeterRegistry.class)
	@ConditionalOnMissingBean({ TomcatMetrics.class, TomcatMetricsBinder.class })
	public TomcatMetricsBinder tomcatMetricsBinder(MeterRegistry meterRegistry) {
		return new TomcatMetricsBinder(meterRegistry);
	}
}

TomcatMetricsAutoConfiguration在CompositeMeterRegistryAutoConfiguration之后自动配置，它会创建TomcatMetricsBinder

TomcatMetricsBinder

org/springframework/boot/actuate/metrics/web/tomcat/TomcatMetricsBinder.java

public class TomcatMetricsBinder implements ApplicationListener<ApplicationStartedEvent>, DisposableBean {
	private final MeterRegistry meterRegistry;
	private final Iterable<Tag> tags;
	private volatile TomcatMetrics tomcatMetrics;
	public TomcatMetricsBinder(MeterRegistry meterRegistry) {
		this(meterRegistry, Collections.emptyList());
	}
	public TomcatMetricsBinder(MeterRegistry meterRegistry, Iterable<Tag> tags) {
		this.meterRegistry = meterRegistry;
		this.tags = tags;
	}
	@Override
	public void onApplicationEvent(ApplicationStartedEvent event) {
		ApplicationContext applicationContext = event.getApplicationContext();
		Manager manager = findManager(applicationContext);
		this.tomcatMetrics = new TomcatMetrics(manager, this.tags);
		this.tomcatMetrics.bindTo(this.meterRegistry);
	}
	private Manager findManager(ApplicationContext applicationContext) {
		if (applicationContext instanceof WebServerApplicationContext) {
			WebServer webServer = ((WebServerApplicationContext) applicationContext).getWebServer();
			if (webServer instanceof TomcatWebServer) {
				Context context = findContext((TomcatWebServer) webServer);
				return context.getManager();
			}
		}
		return null;
	}
	private Context findContext(TomcatWebServer tomcatWebServer) {
		for (Container container : tomcatWebServer.getTomcat().getHost().findChildren()) {
			if (container instanceof Context) {
				return (Context) container;
			}
		}
		return null;
	}
	@Override
	public void destroy() {
		if (this.tomcatMetrics != null) {
			this.tomcatMetrics.close();
		}
	}
}

TomcatMetricsBinder实现了ApplicationListener监听ApplicationStartedEvent，同时也实现了DisposableBean接口；其onApplicationEvent方法会获取applicationContext再获取tomcat的Manager，最后创建tomcatMetrics，然后执行bindTo方法；其close方法主要是执行tomcatMetrics的close方法

TomcatMetrics

io/micrometer/core/instrument/binder/tomcat/TomcatMetrics.java

@NonNullApi
@NonNullFields
public class TomcatMetrics implements MeterBinder {
    private static final String JMX_DOMAIN_EMBEDDED = "Tomcat";
    private static final String JMX_DOMAIN_STANDALONE = "Catalina";
    private static final String OBJECT_NAME_SERVER_SUFFIX = ":type=Server";
    private static final String OBJECT_NAME_SERVER_EMBEDDED = JMX_DOMAIN_EMBEDDED + OBJECT_NAME_SERVER_SUFFIX;
    private static final String OBJECT_NAME_SERVER_STANDALONE = JMX_DOMAIN_STANDALONE + OBJECT_NAME_SERVER_SUFFIX;
    @Nullable
    private final Manager manager;
    private final MBeanServer mBeanServer;
    private final Iterable<Tag> tags;
    private volatile String jmxDomain;
    @Override
    public void bindTo(MeterRegistry registry) {
        registerGlobalRequestMetrics(registry);
        registerServletMetrics(registry);
        registerCacheMetrics(registry);
        registerThreadPoolMetrics(registry);
        registerSessionMetrics(registry);
    }
    //......
}

TomcatMetrics实现了MeterBinder接口，其bindTo方法主要是执行了registerGlobalRequestMetrics、registerServletMetrics、registerCacheMetrics、registerThreadPoolMetrics、registerSessionMetrics

registerGlobalRequestMetrics

    private void registerGlobalRequestMetrics(MeterRegistry registry) {
        registerMetricsEventually("type", "GlobalRequestProcessor", (name, allTags) -> {
            FunctionCounter.builder("tomcat.global.sent", mBeanServer,
                s -> safeDouble(() -> s.getAttribute(name, "bytesSent")))
                .tags(allTags)
                .baseUnit(BaseUnits.BYTES)
                .register(registry);
            FunctionCounter.builder("tomcat.global.received", mBeanServer,
                s -> safeDouble(() -> s.getAttribute(name, "bytesReceived")))
                .tags(allTags)
                .baseUnit(BaseUnits.BYTES)
                .register(registry);
            FunctionCounter.builder("tomcat.global.error", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "errorCount")))
                    .tags(allTags)
                    .register(registry);
            FunctionTimer.builder("tomcat.global.request", mBeanServer,
                    s -> safeLong(() -> s.getAttribute(name, "requestCount")),
                    s -> safeDouble(() -> s.getAttribute(name, "processingTime")), TimeUnit.MILLISECONDS)
                    .tags(allTags)
                    .register(registry);
            TimeGauge.builder("tomcat.global.request.max", mBeanServer, TimeUnit.MILLISECONDS,
                    s -> safeDouble(() -> s.getAttribute(name, "maxTime")))
                    .tags(allTags)
                    .register(registry);
        });
    }

registerGlobalRequestMetrics主要是注册了请求相关的指标

registerServletMetrics

    private void registerServletMetrics(MeterRegistry registry) {
        registerMetricsEventually("j2eeType", "Servlet", (name, allTags) -> {
            FunctionCounter.builder("tomcat.servlet.error", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "errorCount")))
                    .tags(allTags)
                    .register(registry);
            FunctionTimer.builder("tomcat.servlet.request", mBeanServer,
                    s -> safeLong(() -> s.getAttribute(name, "requestCount")),
                    s -> safeDouble(() -> s.getAttribute(name, "processingTime")), TimeUnit.MILLISECONDS)
                    .tags(allTags)
                    .register(registry);
            TimeGauge.builder("tomcat.servlet.request.max", mBeanServer, TimeUnit.MILLISECONDS,
                    s -> safeDouble(() -> s.getAttribute(name, "maxTime")))
                    .tags(allTags)
                    .register(registry);
        });
    }

registerServletMetrics主要是注册了servlet相关的errorCount、requestCount及maxTime

registerCacheMetrics

    private void registerCacheMetrics(MeterRegistry registry) {
        registerMetricsEventually("type", "StringCache", (name, allTags) -> {
            FunctionCounter.builder("tomcat.cache.access", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "accessCount")))
                    .tags(allTags)
                    .register(registry);
            FunctionCounter.builder("tomcat.cache.hit", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "hitCount")))
                    .tags(allTags)
                    .register(registry);
        });
    }

registerCacheMetrics主要是注册了tomcat内部cache的accessCount、hitCount

registerThreadPoolMetrics

    private void registerThreadPoolMetrics(MeterRegistry registry) {
        registerMetricsEventually("type", "ThreadPool", (name, allTags) -> {
            Gauge.builder("tomcat.threads.config.max", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "maxThreads")))
                    .tags(allTags)
                    .baseUnit(BaseUnits.THREADS)
                    .register(registry);
            Gauge.builder("tomcat.threads.busy", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "currentThreadsBusy")))
                    .tags(allTags)
                    .baseUnit(BaseUnits.THREADS)
                    .register(registry);
            Gauge.builder("tomcat.threads.current", mBeanServer,
                    s -> safeDouble(() -> s.getAttribute(name, "currentThreadCount")))
                    .tags(allTags)
                    .baseUnit(BaseUnits.THREADS)
                    .register(registry);
        });
    }

registerThreadPoolMetrics主要是注册了tomcat线程池的相关指标

registerSessionMetrics

    private void registerSessionMetrics(MeterRegistry registry) {
        if (manager == null) {
            // If the binder is created but unable to find the session manager don't register those metrics
            return;
        }
        Gauge.builder("tomcat.sessions.active.max", manager, Manager::getMaxActive)
                .tags(tags)
                .baseUnit("sessions")
                .register(registry);
        Gauge.builder("tomcat.sessions.active.current", manager, Manager::getActiveSessions)
                .tags(tags)
                .baseUnit("sessions")
                .register(registry);
        FunctionCounter.builder("tomcat.sessions.created", manager, Manager::getSessionCounter)
                .tags(tags)
                .baseUnit("sessions")
                .register(registry);
        FunctionCounter.builder("tomcat.sessions.expired", manager, Manager::getExpiredSessions)
                .tags(tags)
                .baseUnit("sessions")
                .register(registry);
        FunctionCounter.builder("tomcat.sessions.rejected", manager, Manager::getRejectedSessions)
                .tags(tags)
                .baseUnit("sessions")
                .register(registry);
        TimeGauge.builder("tomcat.sessions.alive.max", manager, TimeUnit.SECONDS, Manager::getSessionMaxAliveTime)
                .tags(tags)
                .register(registry);
    }

registerSessionMetrics主要是注册了tomcat的session相关指标

小结

springboot的TomcatMetricsBinder主要是接收ApplicationStartedEvent然后创建TomcatMetrics执行bindTo进行注册，TomcatMetrics主要注册了globalRequest、servlet、cache、threadPool、session相关的指标。

到此这篇关于springboot的TomcatMetricsBinder的文章就介绍到这了,更多相关springboot TomcatMetricsBinder内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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