[BlobAsync] Patch 3: Renderer Classes & Logic

content/child/blob_storage/blob_transport_controller.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_TRANSPORT_CONTROLLER_H_
+#define CONTENT_CHILD_BLOB_STORAGE_BLOB_TRANSPORT_CONTROLLER_H_
+
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/shared_memory_handle.h"
+#include "content/child/blob_storage/blob_transport_temporary_holder.h"
+#include "storage/common/blob_storage/blob_storage_constants.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+namespace IPC {
+class Sender;
+}
+
+namespace content {
+
+// Must be used on the IO thread.
+class BlobTransportController {
+ public:
+  static BlobTransportController* GetInstance();
+
+  // This kicks off a blob transfer to the browser thread, which involves
+  // sending an IPC message and storing the blob consolidation object.
+  void InitiateBlobTransfer(const std::string& uuid,
+                            const std::string& type,
+                            scoped_ptr<BlobConsolidation> consolidation,
+                            IPC::Sender* sender);
+
+  // This responds to the request using the sender.
+  void OnMemoryRequest(
+      const std::string& uuid,
+      const std::vector<storage::BlobItemBytesRequest>& requests,
+      std::vector<base::SharedMemoryHandle>* memory_handles,
+      const std::vector<IPC::PlatformFileForTransit>& file_handles,
+      IPC::Sender* sender);
+
+  void OnCancel(const std::string& uuid,
+                storage::IPCBlobCreationCancelCode code);
+
+  void OnDone(const std::string& uuid);
+
+  // This tells the controller that the channel has been closed, and that all
+  // senders previously given to the controller are now invalid.
+  void OnChannelClose();

[michaeln, 2015/08/18 02:50:35]

Shutdown() might be a better name. When this happens, we also want to stop
accepting new blobs for xfer. It happens when the channel is closed, but this
class doesn't care about that. It just needs to know that its time to
Shutdown().

[dmurph, 2015/10/07 00:32:36]

I actually don't need this anymore. We just use the BlobMessageFilter lifetime
for the disk callback.

+
+  ~BlobTransportController();
+
+ private:
+  friend struct DefaultSingletonTraits<BlobTransportController>;
+
+  BlobTransportController();
+
+  // Sends the IPC to cancel the blob transfer, and releases the blob from
+  // internal storage.
+  void CancelBlobTransfer(const std::string& uuid,
+                          storage::IPCBlobCreationCancelCode code,
+                          IPC::Sender* sender);
+
+  BlobTransportTemporaryHolder holder_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlobTransportController);
+};
+
+}  // namespace content
+#endif  // CONTENT_CHILD_BLOB_STORAGE_BLOB_TRANSPORT_CONTROLLER_H_