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