Merge pull request Netflix#199 from fkjellberg/codahale-metrics

Add new module for publishing metrics to Coda Hale Metrics version 3

hystrix-contrib/hystrix-codahale-metrics-publisher/README.md

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+# hystrix-codahale-metrics-publisher
+
+This is an implementation of [HystrixMetricsPublisher](http://netflix.github.com/Hystrix/javadoc/index.html?com/netflix/hystrix/strategy/metrics/HystrixMetricsPublisher.html) that publishes metrics using [Coda Hale Metrics](http://metrics.codahale.com) version 3. If you are using Yammer Metrics version 2, please use the [hystrix-yammer-metrics-publisher](../hystrix-yammer-metrics-publisher) module instead.
+
+See the [Metrics & Monitoring](https://github.com/Netflix/Hystrix/wiki/Metrics-and-Monitoring) Wiki for more information.
+
+# Binaries
+
+Binaries and dependency information for Maven, Ivy, Gradle and others can be found at [http://search.maven.org](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22hystrix-codahale-metrics-publisher%22).
+
+Example for Maven:
+
+```xml
+<dependency>
+    <groupId>com.netflix.hystrix</groupId>
+    <artifactId>hystrix-codahale-metrics-publisher</artifactId>
+    <version>1.1.2</version>
+</dependency>
+```
+
+and for Ivy:
+
+```xml
+<dependency org="com.netflix.hystrix" name="hystrix-codahale-metrics-publisher" rev="1.1.2" />
+```

hystrix-contrib/hystrix-codahale-metrics-publisher/build.gradle

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+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'idea'
+
+dependencies {
+    compile project(':hystrix-core')
+    compile 'com.codahale.metrics:metrics-core:3.0.1'
+}
+
+eclipse {
+    classpath {
+        // include 'provided' dependencies on the classpath
+        plusConfigurations += configurations.provided
+        downloadSources = true
+        downloadJavadoc = true
+    }
+}
+
+idea {
+    module {
+        // include 'provided' dependencies on the classpath
+        scopes.COMPILE.plus += configurations.provided
+    }
+}

hystrix-contrib/hystrix-codahale-metrics-publisher/src/main/java/com/netflix/hystrix/contrib/codahalemetricspublisher/HystrixCodaHaleMetricsPublisher.java

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+/**
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.netflix.hystrix.contrib.codahalemetricspublisher;
+
+import com.codahale.metrics.MetricRegistry;
+import com.netflix.hystrix.HystrixCircuitBreaker;
+import com.netflix.hystrix.HystrixCommandGroupKey;
+import com.netflix.hystrix.HystrixCommandKey;
+import com.netflix.hystrix.HystrixCommandMetrics;
+import com.netflix.hystrix.HystrixCommandProperties;
+import com.netflix.hystrix.HystrixThreadPoolKey;
+import com.netflix.hystrix.HystrixThreadPoolMetrics;
+import com.netflix.hystrix.HystrixThreadPoolProperties;
+import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
+import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherCommand;
+import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherThreadPool;
+
+/**
+ * Coda Hale Metrics (https://github.com/codahale/metrics) implementation of {@link HystrixMetricsPublisher}.
+ */
+public class HystrixCodaHaleMetricsPublisher extends HystrixMetricsPublisher {
+    private final MetricRegistry metricRegistry;
+
+    public HystrixCodaHaleMetricsPublisher(MetricRegistry metricRegistry) {
+        this.metricRegistry = metricRegistry;
+    }
+
+    @Override
+    public HystrixMetricsPublisherCommand getMetricsPublisherForCommand(HystrixCommandKey commandKey, HystrixCommandGroupKey commandGroupKey, HystrixCommandMetrics metrics, HystrixCircuitBreaker circuitBreaker, HystrixCommandProperties properties) {
+        return new HystrixCodaHaleMetricsPublisherCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties, metricRegistry);
+    }
+
+    @Override
+    public HystrixMetricsPublisherThreadPool getMetricsPublisherForThreadPool(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolMetrics metrics, HystrixThreadPoolProperties properties) {
+        return new HystrixCodaHaleMetricsPublisherThreadPool(threadPoolKey, metrics, properties, metricRegistry);
+    }
+}