Move MTPDeviceDelegateImplLinux worker classes to its own files.

chrome/browser/media_gallery/linux/mtp_get_file_info_worker.h

+// Copyright (c) 2012 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_MEDIA_GALLERY_LINUX_MTP_GET_FILE_INFO_WORKER_H_
+#define CHROME_BROWSER_MEDIA_GALLERY_LINUX_MTP_GET_FILE_INFO_WORKER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/platform_file.h"
+#include "base/sequenced_task_runner_helpers.h"
+#include "base/synchronization/cancellation_flag.h"
+#include "chrome/browser/media_gallery/linux/mtp_device_operations_utils.h"
+#include "chrome/browser/media_transfer_protocol/mtp_file_entry.pb.h"
+
+namespace base {
+class SequencedTaskRunner;
+class WaitableEvent;
+}
+
+namespace chrome {
+
+class MTPGetFileInfoWorker;
+typedef struct WorkerDeleter<class MTPGetFileInfoWorker>
+    MTPGetFileInfoWorkerDeleter;
+
+// Worker class to get media device file information given a |path|.
+class MTPGetFileInfoWorker
+    : public base::RefCountedThreadSafe<MTPGetFileInfoWorker,
+                                        MTPGetFileInfoWorkerDeleter> {
+ public:
+  // Constructed on |media_task_runner_| thread.
+  MTPGetFileInfoWorker(const std::string& handle,
+                       const std::string& path,
+                       base::SequencedTaskRunner* task_runner,
+                       base::WaitableEvent* task_completed_event,
+                       base::WaitableEvent* shutdown_event);
+
+  // This function is invoked on |media_task_runner_| to post the task on UI
+  // thread. This blocks the |media_task_runner_| until the task is complete.
+  void Run();
+
+  // Returns GetFileInfo() result and fills in |file_info| with requested file
+  // entry details.
+  base::PlatformFileError get_file_info(
+      base::PlatformFileInfo* file_info) const;
+
+  // Returns the |media_task_runner_| associated with this worker object.
+  // This function is exposed for WorkerDeleter struct to access the
+  // |media_task_runner_|.
+  base::SequencedTaskRunner* media_task_runner() const {
+    return media_task_runner_.get();
+  }
+
+ private:
+  friend struct WorkerDeleter<MTPGetFileInfoWorker>;
+  friend class base::DeleteHelper<MTPGetFileInfoWorker>;
+  friend class base::RefCountedThreadSafe<MTPGetFileInfoWorker,
+                                          MTPGetFileInfoWorkerDeleter>;
+
+  // Destructed via MTPGetFileInfoWorkerDeleter.
+  virtual ~MTPGetFileInfoWorker();
+
+  // Dispatches a request to MediaTransferProtocolManager to get file
+  // information.
+  void DoWorkOnUIThread();
+
+  // Query callback for DoWorkOnUIThread(). On success, |file_entry| has media
+  // file information. On failure, |error| is set to true. This function signals
+  // to unblock |media_task_runner_|.
+  void OnDidWorkOnUIThread(const MtpFileEntry& file_entry, bool error);
+
+  // Stores the device handle to query the device.
+  const std::string device_handle_;
+
+  // Stores the requested media device file path.
+  const std::string path_;
+
+  // Stores a reference to |media_task_runner_| to destruct this object on the
+  // correct thread.
+  scoped_refptr<base::SequencedTaskRunner> media_task_runner_;
+
+  // Stores the result of GetFileInfo().
+  base::PlatformFileError error_;
+
+  // Stores the media file entry information.
+  base::PlatformFileInfo file_entry_info_;
+
+  // |media_task_runner_| can wait on this event until the required operation
+  // is complete.
+  // TODO(kmadhusu): Remove this WaitableEvent after modifying the
+  // DeviceMediaFileUtil functions as asynchronous functions.
+  base::WaitableEvent* on_task_completed_event_;
+
+  // Stores a reference to waitable event associated with the shut down message.
+  base::WaitableEvent* on_shutdown_event_;
+
+  // Set to ignore the request results. This will be set when
+  // MTPDeviceDelegateImplLinux object is about to be deleted.
+  // |on_task_completed_event_| and |on_shutdown_event_| should not be
+  // dereferenced when this is set.
+  base::CancellationFlag cancel_tasks_flag_;
+
+  DISALLOW_COPY_AND_ASSIGN(MTPGetFileInfoWorker);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_MEDIA_GALLERY_LINUX_MTP_GET_FILE_INFO_WORKER_H_