[BlobAsync] Patch 3: Renderer Classes & Logic

content/child/blob_storage/blob_message_filter.h

+// Copyright 2015 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_CHILD_BLOB_STORAGE_BLOB_MESSAGE_FILTER_H_
+#define CONTENT_CHILD_BLOB_STORAGE_BLOB_MESSAGE_FILTER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/shared_memory.h"
+#include "ipc/ipc_platform_file.h"
+#include "ipc/message_filter.h"
+#include "storage/common/blob_storage/blob_storage_constants.h"
+
+namespace IPC {
+class Sender;
+class Message;
+}
+
+namespace storage {
+struct BlobItemBytesRequest;
+}
+
+namespace content {
+class BlobTransportController;
+
+// This message filter forwards Blob IPCs to the BlobTransportController
+// singleton.
+// Invarients: There should only be one filter per renderer process, and it
+//             should live on the main renderer thread.
+class BlobMessageFilter : public IPC::MessageFilter {
+ public:
+  BlobMessageFilter();
+
+  void OnFilterAdded(IPC::Sender* sender) override;
+
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  bool GetSupportedMessageClasses(
+      std::vector<uint32>* supported_message_classes) const override;
+
+  void OnChannelClosing() override;
+
+ protected:
+  ~BlobMessageFilter() override;
+
+ private:
+  void OnRequestMemoryItem(
+      const std::string& uuid,
+      const std::vector<storage::BlobItemBytesRequest>& requests,
+      std::vector<base::SharedMemoryHandle> memory_handles,
+      const std::vector<IPC::PlatformFileForTransit>& file_handles);
+
+  void OnCancelBuildingBlob(const std::string& uuid,
+                            storage::IPCBlobCreationCancelCode code);
+
+  void OnDoneBuildingBlob(const std::string& uuid);
+
+  IPC::Sender* sender_;
+  BlobTransportController* controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlobMessageFilter);
+};
+
+}  // namespace content
+#endif  // CONTENT_CHILD_BLOB_STORAGE_BLOB_MESSAGE_FILTER_H_