1 /* 2 * Copyright (C) 2009 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.util.concurrent; 18 19 import com.google.common.annotations.Beta; 20 import com.google.common.collect.ForwardingObject; 21 22 /** 23 * A {@link Service} that forwards all method calls to another service. 24 * 25 * @author Chris Nokleberg 26 * @since 1.0 27 */ 28 @Beta 29 public abstract class ForwardingService extends ForwardingObject 30 implements Service { 31 32 /** Constructor for use by subclasses. */ 33 protected ForwardingService() {} 34 35 @Override protected abstract Service delegate(); 36 37 @Override public ListenableFuture<State> start() { 38 return delegate().start(); 39 } 40 41 @Override public State state() { 42 return delegate().state(); 43 } 44 45 @Override public ListenableFuture<State> stop() { 46 return delegate().stop(); 47 } 48 49 @Override public State startAndWait() { 50 return delegate().startAndWait(); 51 } 52 53 @Override public State stopAndWait() { 54 return delegate().stopAndWait(); 55 } 56 57 @Override public boolean isRunning() { 58 return delegate().isRunning(); 59 } 60 61 /** 62 * A sensible default implementation of {@link #startAndWait()}, in terms of 63 * {@link #start}. If you override {@link #start}, you may wish to override 64 * {@link #startAndWait()} to forward to this implementation. 65 * @since 9.0 66 */ 67 protected State standardStartAndWait() { 68 return Futures.getUnchecked(start()); 69 } 70 71 /** 72 * A sensible default implementation of {@link #stopAndWait()}, in terms of 73 * {@link #stop}. If you override {@link #stop}, you may wish to override 74 * {@link #stopAndWait()} to forward to this implementation. 75 * @since 9.0 76 */ 77 protected State standardStopAndWait() { 78 return Futures.getUnchecked(stop()); 79 } 80 } 81
