1 /*
2  * Copyright 2017 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 #include <list>
18 #include <unordered_map>
19 #include <unordered_set>
20 #include <vector>
21 
22 #include "bta_gatt_api.h"
23 
24 class BtaGattServerQueue {
25  public:
26   static void Clean(uint16_t conn_id);
27   static void SendNotification(uint16_t conn_id, uint16_t handle,
28                                std::vector<uint8_t> value, bool need_confirm);
29   static void NotificationCallback(uint16_t conn_id);
30   static void CongestionCallback(uint16_t conn_id, bool congested);
31 
32   /* Holds pending GATT operations */
33   struct gatts_operation {
34     uint8_t type;
35     uint16_t attr_id;
36     std::vector<uint8_t> value;
37     bool need_confirm;
38   };
39 
40  private:
41   static bool is_congested;
42   static void mark_as_not_executing(uint16_t conn_id);
43   static void gatts_execute_next_op(uint16_t conn_id);
44 
45   // maps connection id to operations waiting for execution
46   static std::unordered_map<uint16_t, std::list<gatts_operation>>
47       gatts_op_queue;
48 
49   // maps connection id to congestion status of each device
50   static std::unordered_map<uint16_t, bool> congestion_queue;
51 
52   // contain connection ids that currently execute operations
53   static std::unordered_set<uint16_t> gatts_op_queue_executing;
54 };