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// Copyright 2015 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 GOOGLE_APIS_DRIVE_FILES_LIST_REQUEST_RUNNER_H_
#define GOOGLE_APIS_DRIVE_FILES_LIST_REQUEST_RUNNER_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "google_apis/drive/drive_api_requests.h"
#include "google_apis/drive/drive_api_url_generator.h"
#include "google_apis/drive/drive_common_callbacks.h"
namespace google_apis {
class RequestSender;
// Runs file list requests (the FileListRequest class) with a backoff retry
// logic in case of the DRIVE_RESPONSE_TOO_LARGE error code.
class FilesListRequestRunner {
public:
FilesListRequestRunner(
RequestSender* request_sender,
const google_apis::DriveApiUrlGenerator& url_generator);
// Creates a FilesListRequest instance and starts the request with a backoff
// retry in case of DRIVE_RESPONSE_TOO_LARGE error code.
CancelCallback CreateAndStartWithSizeBackoff(
int max_results,
const std::string& q,
const std::string& fields,
const FileListCallback& callback);
~FilesListRequestRunner();
void SetRequestCompletedCallbackForTesting(const base::Closure& callback);
private:
// Called when the cancelling callback returned by
// CreateAndStartWithSizeBackoff is invoked. Once called cancels the current
// request.
void OnCancel(CancelCallback* cancel_callback);
// Called when a single request is completed with either a success or an
// error. In case of DRIVE_RESPONSE_TOO_LARGE it will retry the request with
// half of the requests.
void OnCompleted(int max_results,
const std::string& q,
const std::string& fields,
const FileListCallback& callback,
CancelCallback* cancel_callback,
DriveApiErrorCode error,
scoped_ptr<FileList> entry);
RequestSender* request_sender_; // Not owned.
const google_apis::DriveApiUrlGenerator url_generator_; // Not owned.
base::Closure request_completed_callback_for_testing_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<FilesListRequestRunner> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(FilesListRequestRunner);
};
} // namespace google_apis
#endif // GOOGLE_APIS_DRIVE_FILES_LIST_REQUEST_RUNNER_H_
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