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/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cstdint>
#include <list>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "bta/include/bta_gatt_api.h"
/* BTA GATTC implementation does not allow for multiple commands queuing. So one
* client making calls to BTA_GATTC_ReadCharacteristic, BTA_GATTC_ReadCharDescr,
* BTA_GATTC_WriteCharValue, BTA_GATTC_WriteCharDescr must wait for the callacks
* before scheduling next operation.
*
* Methods below can be used as replacement to BTA_GATTC_* in BTA app. They do
* queue the commands if another command is currently being executed.
*
* If you decide to use those methods in your app, make sure to not mix it with
* existing BTA_GATTC_* API.
*/
class BtaGattQueue {
public:
static void Clean(uint16_t conn_id);
static void ReadCharacteristic(uint16_t conn_id, uint16_t handle,
GATT_READ_OP_CB cb, void* cb_data);
static void ReadDescriptor(uint16_t conn_id, uint16_t handle,
GATT_READ_OP_CB cb, void* cb_data);
static void WriteCharacteristic(uint16_t conn_id, uint16_t handle,
std::vector<uint8_t> value,
tGATT_WRITE_TYPE write_type,
GATT_WRITE_OP_CB cb, void* cb_data);
static void WriteDescriptor(uint16_t conn_id, uint16_t handle,
std::vector<uint8_t> value,
tGATT_WRITE_TYPE write_type, GATT_WRITE_OP_CB cb,
void* cb_data);
static void ConfigureMtu(uint16_t conn_id, uint16_t mtu);
/* Holds pending GATT operations */
struct gatt_operation {
uint8_t type;
uint16_t handle;
GATT_READ_OP_CB read_cb;
void* read_cb_data;
GATT_WRITE_OP_CB write_cb;
void* write_cb_data;
GATT_CONFIGURE_MTU_OP_CB mtu_cb;
void* mtu_cb_data;
/* write-specific fields */
tGATT_WRITE_TYPE write_type;
std::vector<uint8_t> value;
};
private:
static void mark_as_not_executing(uint16_t conn_id);
static void gatt_execute_next_op(uint16_t conn_id);
static void gatt_read_op_finished(uint16_t conn_id, tGATT_STATUS status,
uint16_t handle, uint16_t len,
uint8_t* value, void* data);
static void gatt_write_op_finished(uint16_t conn_id, tGATT_STATUS status,
uint16_t handle, uint16_t len,
const uint8_t* value, void* data);
static void gatt_configure_mtu_op_finished(uint16_t conn_id,
tGATT_STATUS status, void* data);
// maps connection id to operations waiting for execution
static std::unordered_map<uint16_t, std::list<gatt_operation>> gatt_op_queue;
// contain connection ids that currently execute operations
static std::unordered_set<uint16_t> gatt_op_queue_executing;
};
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