174fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart/* 274fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * Copyright (C) 2016 The Android Open Source Project 374fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * 474fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * Licensed under the Apache License, Version 2.0 (the "License"); 574fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * you may not use this file except in compliance with the License. 674fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * You may obtain a copy of the License at 774fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * 874fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * http://www.apache.org/licenses/LICENSE-2.0 974fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * 1074fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * Unless required by applicable law or agreed to in writing, software 1174fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * distributed under the License is distributed on an "AS IS" BASIS, 1274fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1374fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * See the License for the specific language governing permissions and 1474fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * limitations under the License. 1574fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart */ 1674fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 1774fc3bfc009f736d058797e9ddda500d114e3135Paul Stewartpackage android.net; 1874fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 1974fc3bfc009f736d058797e9ddda500d114e3135Paul Stewartimport android.os.HandlerThread; 2074fc3bfc009f736d058797e9ddda500d114e3135Paul Stewartimport android.os.Looper; 2174fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 2274fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart/** 2374fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * Shared singleton connectivity thread for the system. This is a thread for 2474fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * connectivity operations such as AsyncChannel connections to system services. 2574fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * Various connectivity manager objects can use this singleton as a common 2674fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * resource for their handlers instead of creating separate threads of their own. 2774fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart * @hide 2874fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart */ 2974fc3bfc009f736d058797e9ddda500d114e3135Paul Stewartpublic final class ConnectivityThread extends HandlerThread { 30c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi 31c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi // A class implementing the lazy holder idiom: the unique static instance 32c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi // of ConnectivityThread is instantiated in a thread-safe way (guaranteed by 33c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi // the language specs) the first time that Singleton is referenced in get() 34c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi // or getInstanceLooper(). 35c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi private static class Singleton { 36c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi private static final ConnectivityThread INSTANCE = createInstance(); 37c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi } 3874fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 3974fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart private ConnectivityThread() { 4074fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart super("ConnectivityThread"); 4174fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart } 4274fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 43c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi private static ConnectivityThread createInstance() { 44c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi ConnectivityThread t = new ConnectivityThread(); 45c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi t.start(); 46c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi return t; 4774fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart } 4874fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 4974fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart public static ConnectivityThread get() { 50c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi return Singleton.INSTANCE; 5174fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart } 5274fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart 5374fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart public static Looper getInstanceLooper() { 54c4fe5d373caa9f53686e4d58e61394dd40558957Hugo Benichi return Singleton.INSTANCE.getLooper(); 5574fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart } 5674fc3bfc009f736d058797e9ddda500d114e3135Paul Stewart} 57