1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package com.yammer.metrics.core; 20 21 /** 22 * A Metrics Counter implementation that does nothing 23 */ 24 public class NoOpCounter extends Counter { 25 /** singleton instance for everyone to use */ 26 public static final NoOpCounter INSTANCE = new NoOpCounter(); 27 28 /** do not instantiate */ 29 private NoOpCounter() { } 30 31 @Override 32 public void inc() { } 33 34 @Override 35 public void inc(long n) { } 36 37 @Override 38 public void dec() { } 39 40 @Override 41 public void dec(long n) { } 42 43 @Override 44 public long count() { return 0; } 45 46 @Override 47 public void clear() { } 48 49 @Override 50 public <T> void processWith(MetricProcessor<T> processor, MetricName name, 51 T context) 52 throws Exception { } 53 }