MessageQueue.h revision 4fec873a98f7b4380720cd1ad006f74c8cdc73da 
1/*
2 * Copyright (C) 2009 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_MESSAGE_QUEUE_H
18#define ANDROID_MESSAGE_QUEUE_H
19
20#include <stdint.h>
21#include <errno.h>
22#include <sys/types.h>
23
24#include <utils/threads.h>
25#include <utils/Timers.h>
26#include <utils/Looper.h>
27
28#include <gui/DisplayEventReceiver.h>
29
30#include "Barrier.h"
31
32namespace android {
33
34class IDisplayEventConnection;
35class EventThread;
36class SurfaceFlinger;
37
38// ---------------------------------------------------------------------------
39
40class MessageBase : public MessageHandler
41{
42public:
43    MessageBase();
44
45    // return true if message has a handler
46    virtual bool handler() = 0;
47
48    // waits for the handler to be processed
49    void wait() const { barrier.wait(); }
50
51protected:
52    virtual ~MessageBase();
53
54private:
55    virtual void handleMessage(const Message& message);
56
57    mutable Barrier barrier;
58};
59
60// ---------------------------------------------------------------------------
61
62class MessageQueue {
63    class Handler : public MessageHandler {
64        enum {
65            eventMaskInvalidate = 0x1,
66            eventMaskRefresh    = 0x2
67        };
68        MessageQueue& mQueue;
69        int32_t mEventMask;
70    public:
71        Handler(MessageQueue& queue) : mQueue(queue), mEventMask(0) { }
72        virtual void handleMessage(const Message& message);
73        void dispatchRefresh();
74        void dispatchInvalidate();
75    };
76
77    friend class Handler;
78
79    sp<SurfaceFlinger> mFlinger;
80    sp<Looper> mLooper;
81    sp<EventThread> mEventThread;
82    sp<IDisplayEventConnection> mEvents;
83    sp<BitTube> mEventTube;
84    sp<Handler> mHandler;
85
86
87    static int cb_eventReceiver(int fd, int events, void* data);
88    int eventReceiver(int fd, int events);
89
90public:
91    enum {
92        INVALIDATE = 0,
93        REFRESH    = 1,
94    };
95
96    MessageQueue();
97    ~MessageQueue();
98    void init(const sp<SurfaceFlinger>& flinger);
99    void setEventThread(const sp<EventThread>& events);
100
101    void waitMessage();
102    status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime=0);
103    void invalidate();
104    void refresh();
105};
106
107// ---------------------------------------------------------------------------
108
109}; // namespace android
110
111#endif /* ANDROID_MESSAGE_QUEUE_H */
112