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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/background_sync/background_sync_op_scheduler.h"
#include <string>
#include "base/check_op.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/sequenced_task_runner.h"
#include "build/build_config.h"
namespace content {
class BackgroundSyncOpScheduler::Operation {
public:
explicit Operation(base::OnceClosure closure)
: closure_(std::move(closure)) {}
~Operation() = default;
Operation(const Operation&) = delete;
const Operation& operator=(const Operation&) = delete;
// Run the closure passed to the constructor.
void Run() { std::move(closure_).Run(); }
base::WeakPtr<Operation> AsWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
private:
base::OnceClosure closure_;
base::WeakPtrFactory<Operation> weak_ptr_factory_{this};
};
BackgroundSyncOpScheduler::BackgroundSyncOpScheduler(
scoped_refptr<base::SequencedTaskRunner> task_runner)
: task_runner_(std::move(task_runner)) {}
BackgroundSyncOpScheduler::~BackgroundSyncOpScheduler() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void BackgroundSyncOpScheduler::ScheduleOperation(base::OnceClosure closure) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
pending_operations_.emplace(
std::make_unique<BackgroundSyncOpScheduler::Operation>(
std::move(closure)));
MaybeRunOperation();
}
void BackgroundSyncOpScheduler::CompleteOperationAndRunNext() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(running_operation_);
running_operation_ = nullptr;
MaybeRunOperation();
}
bool BackgroundSyncOpScheduler::ScheduledOperations() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return running_operation_ || !pending_operations_.empty();
}
void BackgroundSyncOpScheduler::MaybeRunOperation() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// If there are no operations, then we can't run anything.
if (pending_operations_.empty()) {
DoneStartingAvailableOperations();
return;
}
if (running_operation_) {
DoneStartingAvailableOperations();
return;
}
running_operation_ = std::move(pending_operations_.front());
pending_operations_.pop();
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&BackgroundSyncOpScheduler::Operation::Run,
running_operation_->AsWeakPtr()));
DoneStartingAvailableOperations();
}
} // namespace content
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