| /* |
| * 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; |
| |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * An empty Metrics' Timer implementation that does nothing. |
| */ |
| public class NoOpTimer extends Timer { |
| /** singleton instance for everyone to use */ |
| public static final NoOpTimer INSTANCE = new NoOpTimer(); |
| |
| /** do not instantiate */ |
| private NoOpTimer() { |
| super(new NoOpExecutorService(), TimeUnit.SECONDS, TimeUnit.SECONDS); |
| } |
| |
| @Override |
| public void clear() { } |
| |
| @Override |
| public void update(long duration, TimeUnit unit) { } |
| |
| @Override |
| public <T> T time(Callable<T> event) throws Exception { return event.call(); } |
| |
| @Override |
| public long count() { return 0; } |
| |
| @Override |
| public double fifteenMinuteRate() { return 0.0; } |
| |
| @Override |
| public double fiveMinuteRate() { return 0.0; } |
| |
| @Override |
| public double meanRate() { return 0.0; } |
| |
| @Override |
| public double oneMinuteRate() { return 0.0; } |
| |
| @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 String eventType() { return ""; } |
| |
| @Override |
| public void stop() { } |
| |
| @Override |
| public <T> void processWith(MetricProcessor<T> processor, MetricName name, |
| T context) |
| throws Exception { } |
| } |