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// Copyright 2013 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 CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_
#define CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_
#include "chrome/browser/component_updater/crx_downloader.h"
#include <windows.h>
#include <bits.h>
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "base/win/scoped_comptr.h"
namespace component_updater {
// Implements a downloader in terms of the BITS service. The public interface
// of this class and the CrxDownloader overrides are expected to be called
// from the UI thread. The rest of the class code runs on the FILE thread in
// a single threaded apartment. Instances of this class are created and
// destroyed in the UI thread. See the implementation of the class destructor
// for details regarding the clean up of resources acquired in this class.
class BackgroundDownloader : public CrxDownloader {
protected:
friend class CrxDownloader;
BackgroundDownloader(scoped_ptr<CrxDownloader> successor,
net::URLRequestContextGetter* context_getter,
scoped_refptr<base::SequencedTaskRunner> task_runner,
const DownloadCallback& download_callback);
virtual ~BackgroundDownloader();
private:
// Overrides for CrxDownloader.
virtual void DoStartDownload(const GURL& url) OVERRIDE;
// Called asynchronously on the FILE thread at different stages during
// the download. |OnDownloading| can be called multiple times.
// |EndDownload| switches the execution flow from the FILE to the UI thread.
// Accessing any data members of this object on the FILE thread after
// calling |EndDownload| is unsafe.
void BeginDownload(const GURL& url);
void OnDownloading();
void EndDownload(HRESULT hr);
// Handles the job state transitions to a final state.
void OnStateTransferred();
void OnStateError();
void OnStateCancelled();
void OnStateAcknowledged();
// Handles the transition to a transient state where the job is in the
// queue but not actively transferring data.
void OnStateQueued();
// Handles the job state transition to a transient, non-final error state.
void OnStateTransientError();
// Handles the job state corresponding to transferring data.
void OnStateTransferring();
HRESULT QueueBitsJob(const GURL& url);
HRESULT CreateOrOpenJob(const GURL& url);
HRESULT InitializeNewJob(const GURL& url);
// Returns true if at the time of the call, it appears that the job
// has not been making progress toward completion.
bool IsStuck();
net::URLRequestContextGetter* context_getter_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// The timer and the BITS interface pointers have thread affinity. These
// members are initialized on the FILE thread and they must be destroyed
// on the FILE thread.
scoped_ptr<base::RepeatingTimer<BackgroundDownloader> > timer_;
base::win::ScopedComPtr<IBackgroundCopyManager> bits_manager_;
base::win::ScopedComPtr<IBackgroundCopyJob> job_;
// Contains the time when the download of the current url has started.
base::Time download_start_time_;
// Contains the time when the BITS job is last seen making progress.
base::Time job_stuck_begin_time_;
bool is_completed_;
DISALLOW_COPY_AND_ASSIGN(BackgroundDownloader);
};
} // namespace component_updater
#endif // CHROME_BROWSER_COMPONENT_UPDATER_BACKGROUND_DOWNLOADER_WIN_H_
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