| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.bookkeeper.stats.twitter.finagle; |
| |
| import com.twitter.finagle.stats.StatsReceiver; |
| import com.twitter.util.Function0; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.bookkeeper.stats.Counter; |
| import org.apache.bookkeeper.stats.Gauge; |
| import org.apache.bookkeeper.stats.OpStatsLogger; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| import scala.collection.Seq; |
| |
| /** |
| * A <i>Finagle Stats</i> library based {@link StatsLogger} implementation. |
| */ |
| public class FinagleStatsLoggerImpl implements StatsLogger { |
| private final StatsReceiver stats; |
| // keep the references for finagle gauges. they are destroyed when the stats logger is destroyed. |
| final Map<Gauge, com.twitter.finagle.stats.Gauge> finagleGauges; |
| |
| public FinagleStatsLoggerImpl(final StatsReceiver stats) { |
| this.stats = stats; |
| this.finagleGauges = new HashMap<Gauge, com.twitter.finagle.stats.Gauge>(); |
| } |
| |
| @Override |
| public OpStatsLogger getOpStatsLogger(final String name) { |
| return new OpStatsLoggerImpl(name, this.stats); |
| } |
| |
| @Override |
| public Counter getCounter(final String name) { |
| return new CounterImpl(name, this.stats); |
| } |
| |
| @Override |
| public <T extends Number> void registerGauge(final String name, final Gauge<T> gauge) { |
| // This is done to inter-op with Scala Seq |
| final Seq<String> gaugeName = scala.collection.JavaConversions.asScalaBuffer(Arrays.asList(name)).toList(); |
| synchronized (finagleGauges) { |
| finagleGauges.put(gauge, this.stats.addGauge(gaugeName, gaugeProvider(gauge))); |
| } |
| } |
| |
| @Override |
| public <T extends Number> void unregisterGauge(String name, Gauge<T> gauge) { |
| synchronized (finagleGauges) { |
| finagleGauges.remove(gauge); |
| } |
| } |
| |
| private <T extends Number> Function0<Object> gaugeProvider(final Gauge<T> gauge) { |
| return new Function0<Object>() { |
| @Override |
| public Object apply() { |
| return gauge.getSample().floatValue(); |
| } |
| }; |
| } |
| |
| @Override |
| public StatsLogger scope(String name) { |
| return new FinagleStatsLoggerImpl(this.stats.scope(name)); |
| } |
| |
| @Override |
| public void removeScope(String name, StatsLogger statsLogger) { |
| // no-op |
| } |
| } |