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      1 /*
      2  * Copyright (C) 2010 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 _UI_INPUT_MANAGER_H
     18 #define _UI_INPUT_MANAGER_H
     19 
     20 /**
     21  * Native input manager.
     22  */
     23 
     24 #include "EventHub.h"
     25 #include "InputReader.h"
     26 #include "InputDispatcher.h"
     27 
     28 #include <input/Input.h>
     29 #include <input/InputTransport.h>
     30 #include <utils/Errors.h>
     31 #include <utils/Vector.h>
     32 #include <utils/Timers.h>
     33 #include <utils/RefBase.h>
     34 #include <utils/String8.h>
     35 
     36 namespace android {
     37 
     38 /*
     39  * The input manager is the core of the system event processing.
     40  *
     41  * The input manager uses two threads.
     42  *
     43  * 1. The InputReaderThread (called "InputReader") reads and preprocesses raw input events,
     44  *    applies policy, and posts messages to a queue managed by the DispatcherThread.
     45  * 2. The InputDispatcherThread (called "InputDispatcher") thread waits for new events on the
     46  *    queue and asynchronously dispatches them to applications.
     47  *
     48  * By design, the InputReaderThread class and InputDispatcherThread class do not share any
     49  * internal state.  Moreover, all communication is done one way from the InputReaderThread
     50  * into the InputDispatcherThread and never the reverse.  Both classes may interact with the
     51  * InputDispatchPolicy, however.
     52  *
     53  * The InputManager class never makes any calls into Java itself.  Instead, the
     54  * InputDispatchPolicy is responsible for performing all external interactions with the
     55  * system, including calling DVM services.
     56  */
     57 class InputManagerInterface : public virtual RefBase {
     58 protected:
     59     InputManagerInterface() { }
     60     virtual ~InputManagerInterface() { }
     61 
     62 public:
     63     /* Starts the input manager threads. */
     64     virtual status_t start() = 0;
     65 
     66     /* Stops the input manager threads and waits for them to exit. */
     67     virtual status_t stop() = 0;
     68 
     69     /* Gets the input reader. */
     70     virtual sp<InputReaderInterface> getReader() = 0;
     71 
     72     /* Gets the input dispatcher. */
     73     virtual sp<InputDispatcherInterface> getDispatcher() = 0;
     74 };
     75 
     76 class InputManager : public InputManagerInterface {
     77 protected:
     78     virtual ~InputManager();
     79 
     80 public:
     81     InputManager(
     82             const sp<EventHubInterface>& eventHub,
     83             const sp<InputReaderPolicyInterface>& readerPolicy,
     84             const sp<InputDispatcherPolicyInterface>& dispatcherPolicy);
     85 
     86     // (used for testing purposes)
     87     InputManager(
     88             const sp<InputReaderInterface>& reader,
     89             const sp<InputDispatcherInterface>& dispatcher);
     90 
     91     virtual status_t start();
     92     virtual status_t stop();
     93 
     94     virtual sp<InputReaderInterface> getReader();
     95     virtual sp<InputDispatcherInterface> getDispatcher();
     96 
     97 private:
     98     sp<InputReaderInterface> mReader;
     99     sp<InputReaderThread> mReaderThread;
    100 
    101     sp<InputDispatcherInterface> mDispatcher;
    102     sp<InputDispatcherThread> mDispatcherThread;
    103 
    104     void initialize();
    105 };
    106 
    107 } // namespace android
    108 
    109 #endif // _UI_INPUT_MANAGER_H
    110