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BroadCastStatsLogger.java
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BroadCastStatsLogger.java
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/*
* 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.common.stats;
import static com.google.common.base.Preconditions.checkNotNull;
import java.util.concurrent.TimeUnit;
import org.apache.bookkeeper.stats.CachingStatsLogger;
import org.apache.bookkeeper.stats.Counter;
import org.apache.bookkeeper.stats.Gauge;
import org.apache.bookkeeper.stats.OpStatsData;
import org.apache.bookkeeper.stats.OpStatsLogger;
import org.apache.bookkeeper.stats.StatsLogger;
/**
* Stats Loggers that broadcast stats to multiple {@link StatsLogger}.
*/
public class BroadCastStatsLogger {
/**
* Create a broadcast stats logger of two stats loggers `<code>first</code>` and
* `<code>second</code>`. The returned stats logger doesn't allow registering any
* {@link Gauge}.
*
* @param first
* first stats logger
* @param second
* second stats logger
* @return broadcast stats logger
*/
public static StatsLogger two(StatsLogger first, StatsLogger second) {
return new CachingStatsLogger(new Two(first, second));
}
static class Two implements StatsLogger {
protected final StatsLogger first;
protected final StatsLogger second;
private Two(StatsLogger first, StatsLogger second) {
super();
checkNotNull(first);
checkNotNull(second);
this.first = first;
this.second = second;
}
@Override
public OpStatsLogger getOpStatsLogger(final String statName) {
final OpStatsLogger firstLogger = first.getOpStatsLogger(statName);
final OpStatsLogger secondLogger = second.getOpStatsLogger(statName);
return new OpStatsLogger() {
@Override
public void registerFailedEvent(long l, TimeUnit timeUnit) {
firstLogger.registerFailedEvent(l, timeUnit);
secondLogger.registerFailedEvent(l, timeUnit);
}
@Override
public void registerSuccessfulEvent(long l, TimeUnit timeUnit) {
firstLogger.registerSuccessfulEvent(l, timeUnit);
secondLogger.registerSuccessfulEvent(l, timeUnit);
}
@Override
public void registerSuccessfulValue(long l) {
firstLogger.registerSuccessfulValue(l);
secondLogger.registerSuccessfulValue(l);
}
@Override
public void registerFailedValue(long l) {
firstLogger.registerFailedValue(l);
secondLogger.registerFailedValue(l);
}
@Override
public OpStatsData toOpStatsData() {
// Eventually consistent.
return firstLogger.toOpStatsData();
}
@Override
public void clear() {
firstLogger.clear();
secondLogger.clear();
}
};
}
@Override
public Counter getCounter(final String statName) {
final Counter firstCounter = first.getCounter(statName);
final Counter secondCounter = second.getCounter(statName);
return new Counter() {
@Override
public void clear() {
firstCounter.clear();
secondCounter.clear();
}
@Override
public void inc() {
firstCounter.inc();
secondCounter.inc();
}
@Override
public void dec() {
firstCounter.dec();
secondCounter.dec();
}
@Override
public void addCount(long l) {
firstCounter.addCount(l);
secondCounter.addCount(l);
}
@Override
public void addLatency(long eventLatency, TimeUnit unit) {
long valueMillis = unit.toMicros(eventLatency) / 1000;
firstCounter.addCount(valueMillis);
secondCounter.addCount(valueMillis);
}
@Override
public Long get() {
// Eventually consistent.
return firstCounter.get();
}
};
}
@Override
public <T extends Number> void registerGauge(String statName, Gauge<T> gauge) {
// Different underlying stats loggers have different semantics wrt. gauge registration.
throw new RuntimeException("Cannot register a gauge on BroadCastStatsLogger.Two");
}
@Override
public <T extends Number> void unregisterGauge(String statName, Gauge<T> gauge) {
// no-op
}
@Override
public StatsLogger scope(final String scope) {
return new Two(first.scope(scope), second.scope(scope));
}
@Override
public void removeScope(String scope, StatsLogger statsLogger) {
if (!(statsLogger instanceof Two)) {
return;
}
Two another = (Two) statsLogger;
first.removeScope(scope, another.first);
second.removeScope(scope, another.second);
}
/**
Thread-scoped stats not currently supported.
*/
@Override
public OpStatsLogger getThreadScopedOpStatsLogger(String name) {
return getOpStatsLogger(name);
}
/**
Thread-scoped stats not currently supported.
*/
@Override
public Counter getThreadScopedCounter(String name) {
return getCounter(name);
}
}
/**
* Create a broadcast stats logger of two stats loggers <code>master</code> and <code>slave</code>.
* It is similar as {@link #two(StatsLogger, StatsLogger)}, but it allows registering {@link Gauge}s.
* The {@link Gauge} will be registered under master.
*
* @param master
* master stats logger to receive {@link Counter}, {@link OpStatsLogger} and {@link Gauge}.
* @param slave
* slave stats logger to receive only {@link Counter} and {@link OpStatsLogger}.
* @return broadcast stats logger
*/
public static StatsLogger masterslave(StatsLogger master, StatsLogger slave) {
return new CachingStatsLogger(new MasterSlave(master, slave));
}
static class MasterSlave extends Two {
private MasterSlave(StatsLogger master, StatsLogger slave) {
super(master, slave);
}
@Override
public <T extends Number> void registerGauge(String statName, Gauge<T> gauge) {
first.registerGauge(statName, gauge);
}
@Override
public <T extends Number> void unregisterGauge(String statName, Gauge<T> gauge) {
first.unregisterGauge(statName, gauge);
}
@Override
public StatsLogger scope(String scope) {
return new MasterSlave(first.scope(scope), second.scope(scope));
}
}
}