Pepper: Move FileIO host from renderer to browser.

content/renderer/pepper/quota_file_io.h

-// Copyright (c) 2011 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 CONTENT_RENDERER_PEPPER_QUOTA_FILE_IO_H_
-#define CONTENT_RENDERER_PEPPER_QUOTA_FILE_IO_H_
-
-#include <deque>
-
-#include "base/callback_forward.h"
-#include "base/files/file_util_proxy.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/platform_file.h"
-#include "content/common/content_export.h"
-#include "ppapi/c/pp_file_info.h"
-#include "url/gurl.h"
-#include "webkit/common/quota/quota_types.h"
-
-namespace base {
-class MessageLoopProxy;
-}
-
-namespace content {
-
-// This class is created per PPB_FileIO_Impl instance and provides
-// write operations for quota-managed files (i.e. files of
-// PP_FILESYSTEMTYPE_LOCAL{PERSISTENT,TEMPORARY}).
-class QuotaFileIO {
- public:
-  // For quota handlings for FileIO API. This will be owned by QuotaFileIO.
-  class Delegate {
-   public:
-    virtual ~Delegate() {}
-    typedef base::Callback<void (int64)> AvailableSpaceCallback;
-    virtual void QueryAvailableSpace(
-        const GURL& origin,
-        quota::StorageType type,
-        const AvailableSpaceCallback& callback) = 0;
-    virtual void WillUpdateFile(const GURL& file_path) = 0;
-    virtual void DidUpdateFile(const GURL& file_path, int64_t delta) = 0;
-    // Returns a MessageLoopProxy instance associated with the message loop of
-    // the file thread.
-    virtual scoped_refptr<base::MessageLoopProxy>
-        GetFileThreadMessageLoopProxy() = 0;
-  };
-
-  typedef base::FileUtilProxy::WriteCallback WriteCallback;
-  typedef base::FileUtilProxy::StatusCallback StatusCallback;
-
-  CONTENT_EXPORT QuotaFileIO(Delegate* delegate,
-                             base::PlatformFile file,
-                             const GURL& path_url,
-                             PP_FileSystemType type);
-  CONTENT_EXPORT ~QuotaFileIO();
-
-  // Performs write or setlength operation with quota checks.
-  // Returns true when the operation is successfully dispatched.
-  // |bytes_to_write| must be geater than zero.
-  // |callback| will be dispatched when the operation completes.
-  // Otherwise it returns false and |callback| will not be dispatched.
-  // |callback| will not be dispatched either when this instance is
-  // destroyed before the operation completes.
-  // SetLength cannot be called while there're any in-flight
-  // operations.  For Write it is guaranteed that |callback| are
-  // always dispatched in the same order as Write being called.
-  CONTENT_EXPORT bool Write(int64_t offset,
-                            const char* buffer,
-                            int32_t bytes_to_write,
-                            const WriteCallback& callback);
-  CONTENT_EXPORT bool SetLength(int64_t length,
-                                const StatusCallback& callback);
-
-  Delegate* delegate() const { return delegate_.get(); }
-
- private:
-  class PendingOperationBase;
-  class WriteOperation;
-  class SetLengthOperation;
-
-  bool CheckIfExceedsQuota(int64_t new_file_size) const;
-  void WillUpdate();
-  void DidWrite(WriteOperation* op, int64_t written_offset_end);
-  void DidSetLength(base::PlatformFileError error, int64_t new_file_size);
-
-  bool RegisterOperationForQuotaChecks(PendingOperationBase* op);
-  void DidQueryInfoForQuota(base::PlatformFileError error_code,
-                            const base::PlatformFileInfo& file_info);
-  void DidQueryAvailableSpace(int64_t avail_space);
-  void DidQueryForQuotaCheck();
-
-  scoped_ptr<Delegate> delegate_;
-
-  // The file information associated to this instance.
-  base::PlatformFile file_;
-  GURL file_url_;
-  quota::StorageType storage_type_;
-
-  // Pending operations that are waiting quota checks and pending
-  // callbacks that are to be fired after the operation;
-  // we use two separate queues for them so that we can safely dequeue the
-  // pending callbacks while enqueueing new operations. (This could
-  // happen when callbacks are dispatched synchronously due to error etc.)
-  std::deque<PendingOperationBase*> pending_operations_;
-  std::deque<PendingOperationBase*> pending_callbacks_;
-
-  // Valid only while there're pending quota checks.
-  int64_t cached_file_size_;
-  int64_t cached_available_space_;
-
-  // Quota-related queries and errors occurred during in-flight quota checks.
-  int outstanding_quota_queries_;
-  int outstanding_errors_;
-
-  // For parallel writes bookkeeping.
-  int64_t max_written_offset_;
-  int inflight_operations_;
-
-  base::WeakPtrFactory<QuotaFileIO> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(QuotaFileIO);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_PEPPER_QUOTA_FILE_IO_H_