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 Gauge implementation that always returns null. 23 * @param <T> Type of value returned by this Gauge. 24 */ 25 public class NoOpGuage<T> extends Gauge<T> { 26 /** singleton instance for everyone to use */ 27 public static final NoOpGuage INSTANCE = new NoOpGuage(); 28 29 /** do not instantiate */ 30 public NoOpGuage() { } 31 32 @Override 33 public T value() { return null; } 34 }