| /* |
| * Copyright (C) 2014 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 com.android.telecomm.testapps; |
| |
| import android.os.ConditionVariable; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.util.Log; |
| |
| import java.lang.AutoCloseable; |
| import java.lang.Exception; |
| import java.lang.Override; |
| import java.lang.String; |
| import java.lang.Thread; |
| import java.lang.Throwable; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * Camera thread class used for handling camera callbacks. |
| */ |
| public class CameraThread implements AutoCloseable { |
| private static final String TAG = "CameraThread"; |
| private static final boolean VERBOSE = Log.isLoggable(TAG, Log.VERBOSE); |
| |
| // Timeout for initializing looper and opening camera in Milliseconds. |
| private static final long WAIT_FOR_COMMAND_TO_COMPLETE = 5000; |
| private Looper mLooper = null; |
| private Handler mHandler = null; |
| |
| /** |
| * Create and start a looper thread, return the Handler |
| */ |
| public synchronized Handler start() throws Exception { |
| final ConditionVariable startDone = new ConditionVariable(); |
| if (mHandler != null) { |
| Log.w(TAG, "Looper thread already started"); |
| return mHandler; |
| } |
| |
| new Thread() { |
| @Override |
| public void run() { |
| if (VERBOSE) Log.v(TAG, "start loopRun"); |
| Looper.prepare(); |
| // Save the looper so that we can terminate this thread |
| // after we are done with it. |
| mLooper = Looper.myLooper(); |
| mHandler = new Handler(); |
| startDone.open(); |
| Looper.loop(); |
| if (VERBOSE) Log.v(TAG, "createLooperThread: finished"); |
| } |
| }.start(); |
| |
| if (VERBOSE) Log.v(TAG, "start waiting for looper"); |
| if (!startDone.block(WAIT_FOR_COMMAND_TO_COMPLETE)) { |
| throw new TimeoutException("createLooperThread: start timeout"); |
| } |
| return mHandler; |
| } |
| |
| /** |
| * Terminate the looper thread |
| */ |
| public synchronized void close() throws Exception { |
| if (mLooper == null || mHandler == null) { |
| Log.w(TAG, "Looper thread doesn't start yet"); |
| return; |
| } |
| |
| if (VERBOSE) Log.v(TAG, "Terminate looper thread"); |
| mLooper.quit(); |
| mLooper.getThread().join(); |
| mLooper = null; |
| mHandler = null; |
| } |
| |
| @Override |
| protected void finalize() throws Throwable { |
| try { |
| close(); |
| } finally { |
| super.finalize(); |
| } |
| } |
| } |