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.camera.async;
18 
19 import android.os.Handler;
20 import android.os.HandlerThread;
21 
22 /**
23  * Creates new handlers backed by threads with a specified lifetime.
24  */
25 public class HandlerFactory {
26     /**
27      * @param lifetime The lifetime of the associated handler's thread.
28      * @param threadName The name to assign to the created thread.
29      * @return A handler backed by a new thread.
30      */
create(Lifetime lifetime, String threadName)31     public Handler create(Lifetime lifetime, String threadName) {
32         final HandlerThread thread = new HandlerThread(threadName);
33         thread.start();
34 
35         lifetime.add(new SafeCloseable() {
36             @Override
37             public void close() {
38                 thread.quitSafely();
39             }
40         });
41 
42         return new Handler(thread.getLooper());
43     }
44 
45     /**
46      * @param lifetime The lifetime of the associated handler's thread.
47      * @param threadName The name to assign to the created thread.
48      * @param javaThreadPriority The Java thread priority to use for this thread.
49      * @return A handler backed by a new thread.
50      */
create(Lifetime lifetime, String threadName, int javaThreadPriority)51     public Handler create(Lifetime lifetime, String threadName, int javaThreadPriority) {
52         final HandlerThread thread = new HandlerThread(threadName);
53         thread.start();
54         thread.setPriority(javaThreadPriority);
55 
56         lifetime.add(new SafeCloseable() {
57             @Override
58             public void close() {
59                 thread.quitSafely();
60             }
61         });
62 
63         return new Handler(thread.getLooper());
64     }
65 }
66