content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed 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 android.net;
  
  import android.os.HandlerThread;
  import android.os.Looper;
  
  /**
   * Shared singleton connectivity thread for the system.  This is a thread for
   * connectivity operations such as AsyncChannel connections to system services.
   * Various connectivity manager objects can use this singleton as a common
   * resource for their handlers instead of creating separate threads of their own.
   * @hide
   */
  public final class ConnectivityThread extends HandlerThread {
  
      // A class implementing the lazy holder idiom: the unique static instance
      // of ConnectivityThread is instantiated in a thread-safe way (guaranteed by
      // the language specs) the first time that Singleton is referenced in get()
      // or getInstanceLooper().
      private static class Singleton {
          private static final ConnectivityThread INSTANCE = createInstance();
      }
  
      private ConnectivityThread() {
          super("ConnectivityThread");
      }
  
      private static ConnectivityThread createInstance() {
          ConnectivityThread t = new ConnectivityThread();
          t.start();
          return t;
      }
  
      public static ConnectivityThread get() {
          return Singleton.INSTANCE;
      }
  
      public static Looper getInstanceLooper() {
          return Singleton.INSTANCE.getLooper();
      }
  }
  