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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_UPDATE_REQUEST_TASK_H_
#define COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_UPDATE_REQUEST_TASK_H_
#include <stdint.h>
#include <memory>
#include "base/memory/weak_ptr.h"
#include "components/offline_pages/core/background/request_queue_store.h"
#include "components/offline_pages/core/task.h"
namespace offline_pages {
// Base class for update requests that only work on a single save page request.
// Derived classes should implement appropriate functionality by overloading
// |UpdateRequestImpl| method.
class UpdateRequestTask : public Task {
public:
UpdateRequestTask(RequestQueueStore* store,
int64_t request_id,
const RequestQueueStore::UpdateCallback& callback);
~UpdateRequestTask() override;
// TaskQueue::Task implementation.
void Run() override;
protected:
// Step 1. Reading the requests.
void ReadRequest();
// Step 2. Work is done in the implementation step.
virtual void UpdateRequestImpl(
std::unique_ptr<UpdateRequestsResult> result) = 0;
// Step 3. Completes once update is done.
void CompleteWithResult(std::unique_ptr<UpdateRequestsResult> result);
// Function to uniformly validate read request call for store errors and
// presence of the request.
bool ValidateReadResult(UpdateRequestsResult* result);
RequestQueueStore* store() const { return store_; }
int64_t request_id() const { return request_id_; }
base::WeakPtr<UpdateRequestTask> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
private:
// Store that this task updates. Not owned.
RequestQueueStore* store_;
// Request ID of the request to be started.
int64_t request_id_;
// Callback to complete the task.
RequestQueueStore::UpdateCallback callback_;
base::WeakPtrFactory<UpdateRequestTask> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(UpdateRequestTask);
};
} // namespace offline_pages
#endif // COMPONENTS_OFFLINE_PAGES_CORE_BACKGROUND_UPDATE_REQUEST_TASK_H_
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