| // 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 WEBKIT_PLUGINS_PPAPI_QUOTA_FILE_IO_H_ |
| #define WEBKIT_PLUGINS_PPAPI_QUOTA_FILE_IO_H_ |
| |
| #include <deque> |
| |
| #include "base/file_util_proxy.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/platform_file.h" |
| #include "googleurl/src/gurl.h" |
| #include "ppapi/c/pp_file_info.h" |
| #include "ppapi/c/pp_instance.h" |
| #include "webkit/plugins/webkit_plugins_export.h" |
| #include "webkit/quota/quota_types.h" |
| |
| namespace webkit { |
| namespace ppapi { |
| |
| class PluginDelegate; |
| |
| // 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: |
| typedef base::FileUtilProxy::WriteCallback WriteCallback; |
| typedef base::FileUtilProxy::StatusCallback StatusCallback; |
| |
| WEBKIT_PLUGINS_EXPORT QuotaFileIO(PP_Instance instance, |
| base::PlatformFile file, |
| const GURL& path_url, |
| PP_FileSystemType type); |
| WEBKIT_PLUGINS_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/WillSetLength cannot be called while there're any in-flight |
| // operations. For Write/WillWrite it is guaranteed that |callback| are |
| // always dispatched in the same order as Write being called. |
| WEBKIT_PLUGINS_EXPORT bool Write(int64_t offset, |
| const char* buffer, |
| int32_t bytes_to_write, |
| const WriteCallback& callback); |
| WEBKIT_PLUGINS_EXPORT bool WillWrite(int64_t offset, |
| int32_t bytes_to_write, |
| const WriteCallback& callback); |
| |
| WEBKIT_PLUGINS_EXPORT bool SetLength(int64_t length, |
| const StatusCallback& callback); |
| WEBKIT_PLUGINS_EXPORT bool WillSetLength(int64_t length, |
| const StatusCallback& callback); |
| |
| // Returns the plugin delegate or NULL if the resource has outlived the |
| // instance. |
| PluginDelegate* GetPluginDelegate() const; |
| |
| 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(); |
| |
| // The plugin instance that owns this (via PPB_FileIO_Impl). |
| PP_Instance pp_instance_; |
| |
| // 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 ppapi |
| } // namespace webkit |
| |
| #endif // WEBKIT_PLUGINS_PPAPI_QUOTA_FILE_IO_H_ |