[fsp] Refactor handling operations.

chrome/browser/chromeos/file_system_provider/operations/operation.h

+// Copyright 2014 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_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_
+
+#include <string>
+
+#include "base/files/file.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
+#include "chrome/browser/chromeos/file_system_provider/request_manager.h"
+#include "webkit/browser/fileapi/async_file_util.h"
+
+namespace base {
+class ListValue;
+}  // namespace base
+
+namespace extensions {
+struct Event;
+class EventRouter;
+}  // namespace extensions
+
+namespace chromeos {
+namespace file_system_provider {
+namespace operations {
+
+// Base class for operation bridges between fileapi and providing extensions.
+class Operation : public RequestManager::HandlerInterface {
+ public:
+  typedef base::Callback<bool(scoped_ptr<extensions::Event> event)>
+      DispatchEventImplCallback;
+
+  Operation(extensions::EventRouter* event_router,
+            const ProvidedFileSystemInfo& file_system_info);
+  virtual ~Operation();
+
+  // RequestManager::HandlerInterface overrides.
+  virtual bool Execute(int request_id) OVERRIDE = 0;
+  virtual void OnSuccess(int request_id,
+                         scoped_ptr<RequestValue> result,
+                         bool has_next) OVERRIDE = 0;
+  virtual void OnError(int request_id, base::File::Error error) OVERRIDE = 0;
+
+  // Sets custom dispatchign event implementation for tests.
+  void SetDispatchEventImplForTesting(
+      const DispatchEventImplCallback& callback);
+
+ protected:
+  // Sends an event to the providing extension. Automatically adds the file
+  // system id and the request id fields. Returns false, if the providing
+  // extension does not handle the |event_name| event.
+  bool SendEvent(int request_id,
+                 const std::string& event_name,
+                 scoped_ptr<base::ListValue> event_args);
+
+  ProvidedFileSystemInfo file_system_info_;
+
+ private:
+  DispatchEventImplCallback dispatch_event_impl_;
+  DISALLOW_COPY_AND_ASSIGN(Operation);
+};
+
+}  // namespace operations
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_OPERATIONS_OPERATION_H_