tests/utils/testutils/java/com/android/internal/util/test/BidirectionalAsyncChannel.java

   1 /*
   2  * Copyright (C) 2016 The Android Open Source Project
   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.android.internal.util.test;
  18
  19 import static org.junit.Assert.assertEquals;
  20
  21 import android.os.Handler;
  22 import android.os.Looper;
  23 import android.os.Message;
  24 import android.os.Messenger;
  25 import android.util.Log;
  26
  27 import com.android.internal.util.AsyncChannel;
  28
  29
  30 /**
  31  * Provides an AsyncChannel interface that implements the connection initiating half of a
  32  * bidirectional channel as described in {@link com.android.internal.util.AsyncChannel}.
  33  */
  34 public class BidirectionalAsyncChannel {
  35     private static final String TAG = "BidirectionalAsyncChannel";
  36
  37     private AsyncChannel mChannel;
  38     public enum ChannelState { DISCONNECTED, HALF_CONNECTED, CONNECTED, FAILURE };
  39     private ChannelState mState = ChannelState.DISCONNECTED;
  40
  41     public void assertConnected() {
  42         assertEquals("AsyncChannel was not fully connected", ChannelState.CONNECTED, mState);
  43     }
  44
  45     public void connect(final Looper looper, final Messenger messenger,
  46             final Handler incomingMessageHandler) {
  47         assertEquals("AsyncChannel must be disconnected to connect",
  48                 ChannelState.DISCONNECTED, mState);
  49         mChannel = new AsyncChannel();
  50         Handler rawMessageHandler = new Handler(looper) {
  51                 @Override
  52                 public void handleMessage(Message msg) {
  53                     switch (msg.what) {
  54                     case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
  55                         if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
  56                             Log.d(TAG, "Successfully half connected " + this);
  57                             mChannel.sendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION);
  58                             mState = ChannelState.HALF_CONNECTED;
  59                         } else {
  60                             Log.d(TAG, "Failed to connect channel " + this);
  61                             mState = ChannelState.FAILURE;
  62                             mChannel = null;
  63                         }
  64                         break;
  65                     case AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED:
  66                         mState = ChannelState.CONNECTED;
  67                         Log.d(TAG, "Channel fully connected" + this);
  68                         break;
  69                     case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
  70                         mState = ChannelState.DISCONNECTED;
  71                         mChannel = null;
  72                         Log.d(TAG, "Channel disconnected" + this);
  73                         break;
  74                     default:
  75                         incomingMessageHandler.handleMessage(msg);
  76                         break;
  77                     }
  78                 }
  79             };
  80         mChannel.connect(null, rawMessageHandler, messenger);
  81     }
  82
  83     public void disconnect() {
  84         assertEquals("AsyncChannel must be connected to disconnect",
  85                 ChannelState.CONNECTED, mState);
  86         mChannel.sendMessage(AsyncChannel.CMD_CHANNEL_DISCONNECT);
  87         mState = ChannelState.DISCONNECTED;
  88         mChannel = null;
  89     }
  90
  91     public void sendMessage(Message msg) {
  92         assertEquals("AsyncChannel must be connected to send messages",
  93                 ChannelState.CONNECTED, mState);
  94         mChannel.sendMessage(msg);
  95     }
  96 }