1 /*
2  * Copyright (C) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 /*! \file MessageHandler.h */
17 #ifndef SERVICES_INCLUDE_MESSAGE_HANDLER_H
18 #define SERVICES_INCLUDE_MESSAGE_HANDLER_H
19 
20 #include <condition_variable>
21 #include <mutex>
22 #include <queue>
23 
24 #include "global.h"
25 #include "message.h"
26 #include "message_parcel.h"
27 
28 namespace OHOS {
29 namespace MiscServices {
30 namespace MessageID {
31 enum {
32     MSG_ID_USER_START = 0,       //  a user started
33     MSG_ID_USER_REMOVED,     // a user removed
34     MSG_ID_PACKAGE_REMOVED,  // a package is removed
35     MSG_ID_BUNDLE_SCAN_FINISHED, // bundle scan finished
36     MSG_ID_DATA_SHARE_READY, // datashare ready, ready to create data share helper
37     MSG_ID_PACKAGE_ADDED,
38     MSG_ID_PACKAGE_CHANGED,
39     MSG_ID_SYS_LANGUAGE_CHANGED,
40     MSG_ID_OS_ACCOUNT_STARTED,
41     MSG_ID_BOOT_COMPLETED,
42     MSG_ID_USER_UNLOCKED,
43     MSG_ID_SELECT_BY_RANGE,
44     MSG_ID_SELECT_BY_MOVEMENT,
45     MSG_ID_HANDLE_EXTEND_ACTION,
46     MSG_ID_USER_STOP,
47 
48     MSG_ID_HIDE_KEYBOARD_SELF, // hide the current keyboard
49 
50     // the request from IMSA to IMC
51     MSG_ID_INSERT_CHAR,
52     MSG_ID_DELETE_FORWARD,
53     MSG_ID_DELETE_BACKWARD,
54     MSG_ID_ON_INPUT_STOP,
55     MSG_ID_SEND_KEYBOARD_STATUS,
56     MSG_ID_SEND_FUNCTION_KEY,
57     MSG_ID_MOVE_CURSOR,
58     MSG_ID_ON_SWITCH_INPUT,
59     MSG_ID_GET_TEXT_INDEX_AT_CURSOR,
60     MSG_ID_GET_TEXT_BEFORE_CURSOR,
61     MSG_ID_GET_TEXT_AFTER_CURSOR,
62     MSG_ID_ON_PANEL_STATUS_CHANGE,
63 
64     // the request from IMSA to IMA
65     MSG_ID_INIT_INPUT_CONTROL_CHANNEL,
66     MSG_ID_SET_SUBTYPE,
67 
68     // the request from IMC to IMA
69     MSG_ID_ON_CURSOR_UPDATE,
70     MSG_ID_ON_SELECTION_CHANGE,
71     MSG_ID_ON_CONFIGURATION_CHANGE,
72     MSG_ID_ON_ATTRIBUTE_CHANGE,
73     MSG_ID_QUIT_WORKER_THREAD,
74     MSG_ID_SET_COREANDANGENT,
75 };
76 }
77 
78 class MessageHandler {
79 public:
80     MessageHandler();
81     ~MessageHandler();
82     void SendMessage(Message *msg);
83     Message *GetMessage();
84     static MessageHandler *Instance();
85     static std::mutex handlerMutex_;
86 
87 private:
88     std::mutex mMutex;            // a mutex to guard message queue
89     std::condition_variable mCV;  // condition variable to work with mMutex
90     std::queue<Message *> mQueue; // Message queue, guarded by mMutex;
91 
92     MessageHandler(const MessageHandler &);
93     MessageHandler &operator=(const MessageHandler &);
94     MessageHandler(const MessageHandler &&);
95     MessageHandler &operator=(const MessageHandler &&);
96 };
97 } // namespace MiscServices
98 } // namespace OHOS
99 #endif // SERVICES_INCLUDE_MESSAGE_HANDLER_H
100