Dropwizard 默认使用什么metrics-core？

Question

我一直在尝试根据 dropwizard:1.1.0

找出我的一个项目的 MetricRegistry 详细信息

这里的一个小困惑是我看到我的服务用于 localhost:8181/metrics (adminConnector) 的版本是 3.1.3 这不是最新的，而是包含在 dropwizard-core 中（注 : +- io.dropwizard.metrics:metrics-core:jar:3.2.2 在下面的 dependency:tree 中）

使用的相对 POM 依赖项是：

<dependency>
    <groupId>io.dropwizard</groupId>
    <artifactId>dropwizard-core</artifactId>
    <version>1.1.0</version>
</dependency>
<dependency>
    <groupId>io.federecio</groupId>
    <artifactId>dropwizard-swagger</artifactId>
    <version>0.7.0</version>
</dependency>

mvn dependency:tree 项目如下：

 +- io.dropwizard:dropwizard-core:jar:1.1.0:compile
[INFO] |  +- io.dropwizard:dropwizard-util:jar:1.1.0:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.0:compile
[INFO] |  |  +- com.google.code.findbugs:jsr305:jar:3.0.1:compile
[INFO] |  |  \- joda-time:joda-time:jar:2.9.7:compile
[INFO] |  +- io.dropwizard:dropwizard-jackson:jar:1.1.0:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-core:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-guava:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.module:jackson-module-afterburner:jar:2.8.7:compile
[INFO] |  |  +- com.fasterxml.jackson.datatype:jackson-datatype-joda:jar:2.8.7:compile
[INFO] |  |  +- org.slf4j:slf4j-api:jar:1.7.24:compile
[INFO] |  |  \- ch.qos.logback:logback-classic:jar:1.2.1:compile
[INFO] |  +- io.dropwizard:dropwizard-validation:jar:1.1.0:compile
[INFO] |  |  +- org.hibernate:hibernate-validator:jar:5.3.4.Final:compile
[INFO] |  |  |  +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
[INFO] |  |  |  \- com.fasterxml:classmate:jar:1.3.1:compile
[INFO] |  |  \- org.glassfish:javax.el:jar:3.0.0:compile
[INFO] |  +- io.dropwizard:dropwizard-configuration:jar:1.1.0:compile
[INFO] |  |  \- com.fasterxml.jackson.dataformat:jackson-dataformat-yaml:jar:2.8.7:compile
[INFO] |  |     \- org.yaml:snakeyaml:jar:1.17:compile
[INFO] |  +- io.dropwizard:dropwizard-logging:jar:1.1.0:compile
[INFO] |  |  +- io.dropwizard.metrics:metrics-logback:jar:3.2.2:compile
[INFO] |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.24:compile
[INFO] |  |  +- ch.qos.logback:logback-core:jar:1.2.1:compile
[INFO] |  |  +- org.slf4j:log4j-over-slf4j:jar:1.7.24:compile
[INFO] |  |  +- org.slf4j:jcl-over-slf4j:jar:1.7.24:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-util:jar:9.4.2.v20170220:compile
[INFO] |  +- io.dropwizard:dropwizard-metrics:jar:1.1.0:compile
[INFO] |  +- io.dropwizard:dropwizard-jersey:jar:1.1.0:compile
[INFO] |  |  +- org.glassfish.jersey.core:jersey-server:jar:2.25.1:compile
[INFO] |  |  |  +- org.glassfish.jersey.core:jersey-common:jar:2.25.1:compile
[INFO] |  |  |  |  +- org.glassfish.jersey.bundles.repackaged:jersey-guava:jar:2.25.1:compile
[INFO] |  |  |  |  \- org.glassfish.hk2:osgi-resource-locator:jar:1.0.1:compile
[INFO] |  |  |  +- org.glassfish.jersey.core:jersey-client:jar:2.25.1:compile
[INFO] |  |  |  +- org.glassfish.jersey.media:jersey-media-jaxb:jar:2.25.1:compile
[INFO] |  |  |  +- javax.annotation:javax.annotation-api:jar:1.2:compile
[INFO] |  |  |  +- org.glassfish.hk2:hk2-api:jar:2.5.0-b32:compile
[INFO] |  |  |  |  +- org.glassfish.hk2:hk2-utils:jar:2.5.0-b32:compile
[INFO] |  |  |  |  \- org.glassfish.hk2.external:aopalliance-repackaged:jar:2.5.0-b32:compile
[INFO] |  |  |  +- org.glassfish.hk2.external:javax.inject:jar:2.5.0-b32:compile
[INFO] |  |  |  \- org.glassfish.hk2:hk2-locator:jar:2.5.0-b32:compile
[INFO] |  |  |     \- org.javassist:javassist:jar:3.20.0-GA:compile
[INFO] |  |  +- org.glassfish.jersey.ext:jersey-metainf-services:jar:2.25.1:compile
[INFO] |  |  +- org.glassfish.jersey.ext:jersey-bean-validation:jar:2.25.1:compile
[INFO] |  |  |  +- javax.el:javax.el-api:jar:2.2.4:compile
[INFO] |  |  |  \- org.glassfish.web:javax.el:jar:2.2.4:compile
[INFO] |  |  +- io.dropwizard.metrics:metrics-jersey2:jar:3.2.2:compile
[INFO] |  |  +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:jar:2.8.7:compile
[INFO] |  |  |  +- com.fasterxml.jackson.jaxrs:jackson-jaxrs-base:jar:2.8.7:compile
[INFO] |  |  |  \- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.8.7:compile
[INFO] |  |  +- org.glassfish.jersey.containers:jersey-container-servlet:jar:2.25.1:compile
[INFO] |  |  |  \- org.glassfish.jersey.containers:jersey-container-servlet-core:jar:2.25.1:compile
[INFO] |  |  +- org.eclipse.jetty:jetty-server:jar:9.4.2.v20170220:compile
[INFO] |  |  |  +- javax.servlet:javax.servlet-api:jar:3.1.0:compile
[INFO] |  |  |  \- org.eclipse.jetty:jetty-io:jar:9.4.2.v20170220:compile
[INFO] |  |  +- org.eclipse.jetty:jetty-webapp:jar:9.4.2.v20170220:compile
[INFO] |  |  |  \- org.eclipse.jetty:jetty-xml:jar:9.4.2.v20170220:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-continuation:jar:9.4.2.v20170220:compile
[INFO] |  +- io.dropwizard:dropwizard-servlets:jar:1.1.0:compile
[INFO] |  |  \- io.dropwizard.metrics:metrics-annotation:jar:3.2.2:compile
[INFO] |  +- io.dropwizard:dropwizard-jetty:jar:1.1.0:compile
[INFO] |  |  +- io.dropwizard.metrics:metrics-jetty9:jar:3.2.2:compile
[INFO] |  |  +- org.eclipse.jetty:jetty-servlet:jar:9.4.2.v20170220:compile
[INFO] |  |  |  \- org.eclipse.jetty:jetty-security:jar:9.4.2.v20170220:compile
[INFO] |  |  +- org.eclipse.jetty:jetty-servlets:jar:9.4.2.v20170220:compile
[INFO] |  |  \- org.eclipse.jetty:jetty-http:jar:9.4.2.v20170220:compile
[INFO] |  +- io.dropwizard:dropwizard-lifecycle:jar:1.1.0:compile
[INFO] |  +- io.dropwizard.metrics:metrics-core:jar:3.2.2:compile
[INFO] |  +- io.dropwizard.metrics:metrics-jvm:jar:3.2.2:compile
[INFO] |  +- io.dropwizard.metrics:metrics-servlets:jar:3.2.2:compile
[INFO] |  |  +- io.dropwizard.metrics:metrics-json:jar:3.2.2:compile
[INFO] |  |  \- com.papertrail:profiler:jar:1.0.2:compile
[INFO] |  +- io.dropwizard.metrics:metrics-healthchecks:jar:3.2.2:compile
[INFO] |  +- io.dropwizard:dropwizard-request-logging:jar:1.1.0:compile
[INFO] |  |  \- ch.qos.logback:logback-access:jar:1.2.1:compile
[INFO] |  +- net.sourceforge.argparse4j:argparse4j:jar:0.7.0:compile
[INFO] |  \- org.eclipse.jetty.toolchain.setuid:jetty-setuid-java:jar:1.0.3:compile
[INFO] +- io.federecio:dropwizard-swagger:jar:0.7.0:compile
[INFO] |  +- io.dropwizard:dropwizard-assets:jar:0.8.0:compile
[INFO] |  +- io.dropwizard:dropwizard-views:jar:0.8.0:compile
[INFO] |  +- io.dropwizard:dropwizard-views-freemarker:jar:0.8.0:compile
[INFO] |  |  \- org.freemarker:freemarker:jar:2.3.21:compile
[INFO] |  +- com.wordnik:swagger-jersey2-jaxrs:jar:1.5.1-M2:compile
[INFO] |  |  \- com.wordnik:swagger-jaxrs:jar:1.5.1-M2:compile
[INFO] |  |     +- com.fasterxml.jackson.dataformat:jackson-dataformat-xml:jar:2.4.2:compile
[INFO] |  |     |  \- org.codehaus.woodstox:stax2-api:jar:3.1.4:compile
[INFO] |  |     +- com.wordnik:swagger-core:jar:1.5.1-M2:compile
[INFO] |  |     |  \- com.wordnik:swagger-models:jar:1.5.1-M2:compile
[INFO] |  |     |     \- com.wordnik:swagger-annotations:jar:1.5.1-M2:compile
[INFO] |  |     \- org.reflections:reflections:jar:0.9.9:compile
[INFO] |  |        \- com.google.code.findbugs:annotations:jar:2.0.1:compile
[INFO] |  \- xml-apis:xml-apis:jar:1.4.01:compile
[INFO] +- com.google.inject:guice:jar:4.1.0:compile
[INFO] |  +- javax.inject:javax.inject:jar:1:compile
[INFO] |  +- aopalliance:aopalliance:jar:1.0:compile
[INFO] |  \- com.google.guava:guava:jar:19.0:compile
[INFO] +- org.apache.httpcomponents:httpclient:jar:4.5.3:compile
[INFO] |  +- org.apache.httpcomponents:httpcore:jar:4.4.6:compile
[INFO] |  +- commons-logging:commons-logging:jar:1.2:compile
[INFO] |  \- commons-codec:commons-codec:jar:1.9:compile
[INFO] +- javax.ws.rs:javax.ws.rs-api:jar:2.0.1:compile
[INFO] \- org.junit.jupiter:junit-jupiter-api:jar:5.0.0-M4:test
[INFO]    +- org.opentest4j:opentest4j:jar:1.0.0-M2:test
[INFO]    \- org.junit.platform:junit-platform-commons:jar:1.0.0-M4:test

只是想知道，Dropwizard 是如何配置 MetricRegistry 的？

更多详细信息（如果需要）：-

我正在使用 guice 注入将 MetricRegistry 绑定到扩展 AbstractModule 为

的模块中

bind(MetricRegistry.class).toInstance(environment.metrics());

并在服务 class 中将此注入器称为

public static void main(String[] args) throws Exception {
    new Service().run(args);
}

@Override
public void run(ServiceConfig config, Environment environment) throws Exception {
    Injector injector = Guice.createInjector(new ExtendingModule(config, environment));
    .... // not altering metrics here
}

Answer 1

DW 只是创建一个指标注册表，没有任何魔法，也没有任何涉及。请参阅 Bootstrap class：

public Bootstrap(Application<T> application) {
    this.application = application;
    this.objectMapper = Jackson.newObjectMapper();
    this.bundles = new ArrayList<>();
    this.configuredBundles = new ArrayList<>();
    this.commands = new ArrayList<>();
    this.validatorFactory = Validators.newValidatorFactory();
    this.metricRegistry = new MetricRegistry();
    this.configurationSourceProvider = new FileConfigurationSourceProvider();
    this.classLoader = Thread.currentThread().getContextClassLoader();
    this.configurationFactoryFactory = new DefaultConfigurationFactoryFactory<>();
    this.healthCheckRegistry = new HealthCheckRegistry();
}

特别是：

this.metricRegistry = new MetricRegistry();

差不多就是这样。

忘了，他们还注册了一些标准模块：

/**
     * Registers the JVM metrics to the metric registry and start to report
     * the registry metrics via JMX.
     */
    public void registerMetrics() {
        if (metricsAreRegistered) {
            return;
        }
        getMetricRegistry().register("jvm.attribute", new JvmAttributeGaugeSet());
        getMetricRegistry().register("jvm.buffers", new BufferPoolMetricSet(ManagementFactory
                                                                               .getPlatformMBeanServer()));
        getMetricRegistry().register("jvm.classloader", new ClassLoadingGaugeSet());
        getMetricRegistry().register("jvm.filedescriptor", new FileDescriptorRatioGauge());
        getMetricRegistry().register("jvm.gc", new GarbageCollectorMetricSet());
        getMetricRegistry().register("jvm.memory", new MemoryUsageGaugeSet());
        getMetricRegistry().register("jvm.threads", new ThreadStatesGaugeSet());

        JmxReporter.forRegistry(metricRegistry).build().start();
        metricsAreRegistered = true;
    }

该版本与您正在使用的 Metric 库版本无关，而是与向 ObjectMapper 注册以进行序列化的 MetricsModule 相关联。在我的例子中，class 看起来像这样：

public class MetricsModule extends Module {
    static final Version VERSION = new Version(3, 0, 0, "", "com.codahale.metrics", "metrics-json");

在序列化程序中，第一行执行：

@Override
        public void serialize(MetricRegistry registry,
                              JsonGenerator json,
                              SerializerProvider provider) throws IOException {
            json.writeStartObject();
            json.writeStringField("version", VERSION.toString());

这是您的版本来源。

诚然，这不是很直观。我认为这更像是一个内部版本控制，只要特定序列化模块中的代码发生变化，它就会更新——但你必须向 DW 人员询问有关详细信息。我的指标是 3.1.2 或类似的东西，它为我打印 3.0.0。

-- 阿图尔

Dropwizard 默认使用什么metrics-core？

What metrics-core does Dropwizard uses by default?

java

guice

maven

dropwizard

codahale-metrics