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ryantenney / metrics-spring

Spring integration for Metrics
http://www.ryantenney.com/metrics-spring/
Apache License 2.0
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Metrics for Spring

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About

The metrics-spring module integrates Dropwizard Metrics library with Spring, and provides XML and Java configuration.

This module does the following:

Maven

Current version is 3.1.3, which is compatible with Metrics 3.1.2

<dependency>
    <groupId>com.ryantenney.metrics</groupId>
    <artifactId>metrics-spring</artifactId>
    <version>3.1.3</version>
</dependency>

Basic Usage

As of version 3, metrics-spring may be configured using XML or Java, depending on your personal preference.

Spring Context XML:

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:metrics="http://www.ryantenney.com/schema/metrics"
       xsi:schemaLocation="
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.ryantenney.com/schema/metrics
           http://www.ryantenney.com/schema/metrics/metrics.xsd">

    <!-- Creates a MetricRegistry bean -->
    <metrics:metric-registry id="metricRegistry" />

    <!-- Creates a HealthCheckRegistry bean (Optional) -->
    <metrics:health-check-registry id="health" />

    <!-- Registers BeanPostProcessors with Spring which proxy beans and capture metrics -->
    <!-- Include this once per context (once in the parent context and in any subcontexts) -->
    <metrics:annotation-driven metric-registry="metricRegistry" />

    <!-- Example reporter definiton. Supported reporters include jmx, slf4j, graphite, and others. -->
    <!-- Reporters should be defined only once, preferably in the parent context -->
    <metrics:reporter type="console" metric-registry="metricRegistry" period="1m" />

    <!-- Register metric beans (Optional) -->
    <!-- The metrics in this example require metrics-jvm -->
    <metrics:register metric-registry="metricRegistry">
        <bean metrics:name="jvm.gc" class="com.codahale.metrics.jvm.GarbageCollectorMetricSet" />
        <bean metrics:name="jvm.memory" class="com.codahale.metrics.jvm.MemoryUsageGaugeSet" />
        <bean metrics:name="jvm.thread-states" class="com.codahale.metrics.jvm.ThreadStatesGaugeSet" />
        <bean metrics:name="jvm.fd.usage" class="com.codahale.metrics.jvm.FileDescriptorRatioGauge" />
    </metrics:register>

    <!-- Beans and other Spring config -->

</beans>

Java Annotation Config:

import java.util.concurrent.TimeUnit;
import org.springframework.context.annotation.Configuration;
import com.codahale.metrics.ConsoleReporter;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.SharedMetricRegistries;
import com.ryantenney.metrics.spring.config.annotation.EnableMetrics;
import com.ryantenney.metrics.spring.config.annotation.MetricsConfigurerAdapter;

@Configuration
@EnableMetrics
public class SpringConfiguringClass extends MetricsConfigurerAdapter {

    @Override
    public void configureReporters(MetricRegistry metricRegistry) {
        // registerReporter allows the MetricsConfigurerAdapter to
        // shut down the reporter when the Spring context is closed
        registerReporter(ConsoleReporter
            .forRegistry(metricRegistry)
            .build())
            .start(1, TimeUnit.MINUTES);
    }

}

XML Config Documentation

The <metrics:annotation-driven /> element is required, and has 4 optional arguments:

The <metrics:metric-registry /> element constructs a new MetricRegistry or retrieves a shared registry:

The <metrics:health-check-registry /> element constructs a new HealthCheckRegistry:

The <metrics:reporter /> element creates and starts a reporter:

The <metrics:register /> element registers with the MetricRegistry a bean which extends implements Metric or MetricSet

Java Config Documentation

A @Configuration class annotated with @EnableMetrics is functionally equivalent to using the <metrics:annotation-driven /> element.

The class may also implement the interface MetricsConfigurer, or extend the abstract class MetricsConfigurerAdapter

A Note on the Limitations of Spring AOP

Due to limitations of Spring AOP only public methods can be proxied, so @Timed, @Metered, @ExceptionMetered, and @Counted have no effect on non-public methods. Additionally, calling an annotated method from within the same class will not go through the proxy.

public class Foo {

    @Timed
    public void bar() { /* … */ }

    public void baz() {
        this.bar(); // doesn't pass through the proxy

        // fix: reengineer
        // workaround: enable `expose-proxy` and change to:
        ((Foo) AopContext.currentProxy()).bar(); // hideous, but it works
    }
}

As @Gauge doesn’t involve a proxy, it may be used on non-public fields and methods. Additionally, @InjectMetric may be used on non-public, non-final fields.

Users of the Maven Shade plugin

Please see the Shade Readme

Documentation

Javadocs are hosted at http://ryantenney.github.io/metrics-spring/docs/

Acknowledgements

YourKit

YourKit is kindly supporting this open source project with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: YourKit Java Profiler and YourKit .NET Profiler.

License

Copyright (c) 2012-2017 Ryan Tenney

Portions Copyright (c) 2012-2013 Martello Technologies

Published under Apache Software License 2.0, see LICENSE

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