1 /*
2  * Copyright (C) 2011 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 #ifndef ANDROID_PRIVATE_GUI_COMPOSER_SERVICE_H
18 #define ANDROID_PRIVATE_GUI_COMPOSER_SERVICE_H
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <utils/Singleton.h>
24 #include <utils/StrongPointer.h>
25 
26 
27 namespace android {
28 
29 // ---------------------------------------------------------------------------
30 
31 class IMemoryHeap;
32 class ISurfaceComposer;
33 
34 // ---------------------------------------------------------------------------
35 
36 // This holds our connection to the composer service (i.e. SurfaceFlinger).
37 // If the remote side goes away, we will re-establish the connection.
38 // Users of this class should not retain the value from
39 // getComposerService() for an extended period.
40 //
41 // (It's not clear that using Singleton is useful here anymore.)
42 class ComposerService : public Singleton<ComposerService>
43 {
44     sp<ISurfaceComposer> mComposerService;
45     sp<IBinder::DeathRecipient> mDeathObserver;
46     Mutex mLock;
47 
48     ComposerService();
49     void connectLocked();
50     void composerServiceDied();
51     friend class Singleton<ComposerService>;
52 public:
53 
54     // Get a connection to the Composer Service.  This will block until
55     // a connection is established.
56     static sp<ISurfaceComposer> getComposerService();
57 };
58 
59 // ---------------------------------------------------------------------------
60 }; // namespace android
61 
62 #endif // ANDROID_PRIVATE_GUI_COMPOSER_SERVICE_H
63