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      1 /*
      2  * Copyright (C) 2014 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.server.telecom.testapps;
     18 
     19 import android.os.ConditionVariable;
     20 import android.os.Handler;
     21 import android.os.Looper;
     22 import android.util.Log;
     23 
     24 import java.lang.AutoCloseable;
     25 import java.lang.Exception;
     26 import java.lang.Override;
     27 import java.lang.String;
     28 import java.lang.Thread;
     29 import java.lang.Throwable;
     30 import java.util.concurrent.TimeoutException;
     31 
     32 /**
     33  * Camera thread class used for handling camera callbacks.
     34  */
     35 public class CameraThread implements AutoCloseable {
     36     private static final String TAG = "CameraThread";
     37     private static final boolean VERBOSE = Log.isLoggable(TAG, Log.VERBOSE);
     38 
     39     // Timeout for initializing looper and opening camera in Milliseconds.
     40     private static final long WAIT_FOR_COMMAND_TO_COMPLETE = 5000;
     41     private Looper mLooper = null;
     42     private Handler mHandler = null;
     43 
     44     /**
     45      * Create and start a looper thread, return the Handler
     46      */
     47     public synchronized Handler start() throws Exception {
     48         final ConditionVariable startDone = new ConditionVariable();
     49         if (mHandler != null) {
     50             Log.w(TAG, "Looper thread already started");
     51             return mHandler;
     52         }
     53 
     54         new Thread() {
     55             @Override
     56             public void run() {
     57                 if (VERBOSE) Log.v(TAG, "start loopRun");
     58                 Looper.prepare();
     59                 // Save the looper so that we can terminate this thread
     60                 // after we are done with it.
     61                 mLooper = Looper.myLooper();
     62                 mHandler = new Handler();
     63                 startDone.open();
     64                 Looper.loop();
     65                 if (VERBOSE) Log.v(TAG, "createLooperThread: finished");
     66             }
     67         }.start();
     68 
     69         if (VERBOSE) Log.v(TAG, "start waiting for looper");
     70         if (!startDone.block(WAIT_FOR_COMMAND_TO_COMPLETE)) {
     71             throw new TimeoutException("createLooperThread: start timeout");
     72         }
     73         return mHandler;
     74     }
     75 
     76     /**
     77      * Terminate the looper thread
     78      */
     79     public synchronized void close() throws Exception {
     80         if (mLooper == null || mHandler == null) {
     81             Log.w(TAG, "Looper thread doesn't start yet");
     82             return;
     83         }
     84 
     85         if (VERBOSE) Log.v(TAG, "Terminate looper thread");
     86         mLooper.quit();
     87         mLooper.getThread().join();
     88         mLooper = null;
     89         mHandler = null;
     90     }
     91 
     92     @Override
     93     protected void finalize() throws Throwable {
     94         try {
     95             close();
     96         } finally {
     97             super.finalize();
     98         }
     99     }
    100 }
    101