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      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