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NullStatsLogger.java
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NullStatsLogger.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.stats;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.concurrent.TimeUnit;
/**
* A <i>no-op</i> {@code StatsLogger}.
*
* <p>Metrics are not recorded, making this receiver useful in unit tests and as defaults in
* situations where metrics are not strictly required.
*/
@SuppressFBWarnings("EI_EXPOSE_REP2")
public class NullStatsLogger implements StatsLogger {
public static final NullStatsLogger INSTANCE = new NullStatsLogger();
/**
* A <i>no-op</i> {@code OpStatsLogger}.
*/
static class NullOpStatsLogger implements OpStatsLogger {
final OpStatsData nullOpStats = new OpStatsData(0, 0, 0, new long[6]);
@Override
public void registerFailedEvent(long eventLatency, TimeUnit unit) {
// nop
}
@Override
public void registerSuccessfulEvent(long eventLatency, TimeUnit unit) {
// nop
}
@Override
public void registerSuccessfulValue(long value) {
// nop
}
@Override
public void registerFailedValue(long value) {
// nop
}
@Override
public OpStatsData toOpStatsData() {
return nullOpStats;
}
@Override
public void clear() {
// nop
}
}
static NullOpStatsLogger nullOpStatsLogger = new NullOpStatsLogger();
/**
* A <i>no-op</i> {@code Counter}.
*/
static class NullCounter implements Counter {
@Override
public void clear() {
// nop
}
@Override
public void inc() {
// nop
}
@Override
public void dec() {
// nop
}
@Override
public void addCount(long delta) {
// nop
}
@Override
public void addLatency(long eventLatency, TimeUnit unit) {
// nop
}
@Override
public Long get() {
return 0L;
}
}
static NullCounter nullCounter = new NullCounter();
@Override
public OpStatsLogger getOpStatsLogger(String name) {
return nullOpStatsLogger;
}
@Override
public Counter getCounter(String name) {
return nullCounter;
}
@Override
public <T extends Number> void registerGauge(String name, Gauge<T> gauge) {
// nop
}
@Override
public <T extends Number> void unregisterGauge(String name, Gauge<T> gauge) {
// nop
}
@Override
public StatsLogger scope(String name) {
return this;
}
@Override
public void removeScope(String name, StatsLogger statsLogger) {
// nop
}
@Override
public OpStatsLogger getThreadScopedOpStatsLogger(String name) {
return getOpStatsLogger(name);
}
@Override
public Counter getThreadScopedCounter(String name) {
return getCounter(name);
}
}