JMX Reporter for Gerrit's Metrics Registry

Change-Id: I8fbaa491e88ccda2e88c040f38edc833ba345013

BUCK

diff --git a/BUCK b/BUCK
new file mode 100644
index 0000000..419c77e
--- /dev/null
+++ b/BUCK
@@ -0,0 +1,22 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+include_defs('//lib/maven.defs')
+
+gerrit_plugin(
+  name = 'metrics-reporter-jmx',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/resources/**/*']),
+  deps = [
+    '//lib/dropwizard:dropwizard-core'
+  ],
+  manifest_entries = [
+    'Gerrit-PluginName: metrics-reporter-jmx',
+  ],
+)
+
+# this is required for bucklets/tools/eclipse/project.py to work
+java_library(
+  name = 'classpath',
+  deps = [':metrics__plugin'],
+)
+
+

src/main/java/com/googlesource/gerrit/plugins/metricsreporters/GerritJmxReporter.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/metricsreporters/GerritJmxReporter.java b/src/main/java/com/googlesource/gerrit/plugins/metricsreporters/GerritJmxReporter.java
new file mode 100644
index 0000000..2a9a3d7
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/metricsreporters/GerritJmxReporter.java
@@ -0,0 +1,43 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.googlesource.gerrit.plugins.metricsreporters;
+
+import com.google.gerrit.extensions.annotations.Listen;
+import com.google.gerrit.extensions.events.LifecycleListener;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
+import com.codahale.metrics.JmxReporter;
+import com.codahale.metrics.MetricRegistry;
+
+@Listen
+@Singleton
+public class GerritJmxReporter implements LifecycleListener {
+  private final JmxReporter reporter;
+
+  @Inject
+  public GerritJmxReporter(MetricRegistry registry) {
+    this.reporter = JmxReporter.forRegistry(registry).build();
+  }
+
+  @Override
+  public void start() {
+    reporter.start();
+  }
+
+  @Override
+  public void stop() {
+    reporter.stop();
+  }
+}