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/******************************************************************************
*
* Copyright 2021 Google, Inc.
*
* 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.
*
******************************************************************************/
#pragma once
#include <memory>
#include <mutex>
#include <string>
#include <flatbuffers/flatbuffers.h>
#include "handler.h"
#include "wakelock_manager_generated.h"
namespace bluetooth {
namespace os {
class WakelockManager {
public:
static const std::string kBtWakelockId;
static WakelockManager& Get() {
static WakelockManager instance;
return instance;
}
// The set of functions required by GD to grab wake locks. A caller with a custom wakelock implementation should
// implement this class and passed into the stack through SetCallouts()
class OsCallouts {
public:
virtual ~OsCallouts() = default;
virtual void AcquireCallout(const std::string& lock_name) = 0;
virtual void ReleaseCallout(const std::string& lock_name) = 0;
};
// Set the Bluetooth OS callouts to |callouts|.
//
// This function should be called when native kernel wakelock are not used directly.
// If this function is not called, or |callouts| is nullptr, then native kernel wakelock will be used.
// When |callouts| are used, the callbacks are going to be invoked asynchronously to avoid being blocked by upper
// layer delays. Therefore, a handler is needed and the callout result will be ignored.
//
// This method must be called before calling Acquire() or Release()
void SetOsCallouts(OsCallouts* callouts, Handler* handler);
// Acquire the Bluetooth wakelock.
// Return true on success, otherwise false.
// The function is thread safe.
bool Acquire();
// Release the Bluetooth wakelock.
// Return true on success, otherwise false.
// The function is thread safe.
bool Release();
// Cleanup the wakelock internal runtime state.
// This will NOT clean up the callouts
void CleanUp();
// Dump wakelock-related debug info to a flat buffer defined in wakelock_manager.fbs
flatbuffers::Offset<WakelockManagerData> GetDumpsysData(flatbuffers::FlatBufferBuilder* fb_builder);
~WakelockManager();
private:
WakelockManager();
std::recursive_mutex mutex_;
bool initialized_ = false;
OsCallouts* os_callouts_ = nullptr;
Handler* os_callouts_handler_ = nullptr;
bool is_native_ = true;
struct Stats;
std::unique_ptr<Stats> pstats_;
};
} // namespace os
} // namespace bluetooth
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