/*
* 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 com.yammer.metrics.core;
import com.yammer.metrics.stats.Snapshot;
/**
* An empty Metrics' Histogram that does nothing.
*/
public class NoOpHistogram extends Histogram {
/** singleton instance for everyone to use */
public static final NoOpHistogram INSTANCE = new NoOpHistogram();
/** do not instantiate */
private NoOpHistogram() { super(SampleType.UNIFORM); }
@Override
public void clear() { }
@Override
public void update(int value) { }
@Override
public void update(long value) { }
@Override
public long count() { return 0; }
@Override
public double max() { return 0.0; }
@Override
public double min() { return 0.0; }
@Override
public double mean() { return 0.0; }
@Override
public double stdDev() { return 0.0; }
@Override
public double sum() { return 0.0; }
@Override
public Snapshot getSnapshot() { return new Snapshot(new double[0]); }
@Override
public <T> void processWith(MetricProcessor<T> processor, MetricName name,
T context)
throws Exception { }
}