Dispatch IndexedDB IPC messages to worker threads

content/common/indexed_db_message_filter.h

Index: content/common/indexed_db_message_filter.h
diff --git a/content/common/indexed_db_message_filter.h b/content/common/indexed_db_message_filter.h
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+// 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_COMMON_INDEXED_DB_MESSAGE_FILTER_H_
+#define CONTENT_COMMON_INDEXED_DB_MESSAGE_FILTER_H_
+#pragma once
+
+#include <map>
+#include <set>
+
+#include "base/atomic_sequence_num.h"
+#include "base/nullable_string16.h"
+#include "base/threading/thread_local.h"
+#include "content/common/worker_task_runner.h"
+#include "ipc/ipc_channel_proxy.h"
+
+class IndexedDBDispatcher;
+class IndexedDBKey;
+
+namespace content {
+class SerializedScriptValue;
+}
+
+namespace WebKit {
+class WebIDBCallbacks;
+class WebIDBDatabaseCallbacks;
+class WebIDBTransactionCallbacks;
+class WebWorkerRunLoop;
+}
+
+class IndexedDBMessageFilter : public IPC::ChannelProxy::MessageFilter,
+                               public WorkerTaskRunner::Observer {
+ public:
+  IndexedDBMessageFilter();
+  virtual ~IndexedDBMessageFilter();
+
+  // IPC::Channel::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
+
+  // This returns the dispatcher associated with the current WebWorkerRunLoop,
+  // if being run from a worker.
+  IndexedDBDispatcher* thread_specific_idb_dispatcher();
+
+  // WorkerTaskRunner::Observer implementation.
+  virtual void onLoopRegistered() OVERRIDE;
+  virtual void onLoopUnregistered() OVERRIDE;
+
+  int GetUniqueCallbackIDWithThreadID();
+  void DidRemoveTransactionID(int32 id);
+  void DidAddTransactionID(int32 id);
+
+ private:
+  friend class MsgForwarderTask;
+  typedef std::map<int, int> CallbackIDToRunLoopMap;
+
+  void LookupAndForwardToThread(const IPC::Message& msg,
+                                int32 id,
+                                const CallbackIDToRunLoopMap& map);
+  void ForwardToThread(const IPC::Message& msg, int32 thread_id);
+  void ForwardToMainThread(const IPC::Message& msg);
+  void DispatchMessage(const IPC::Message& msg);
+
+  static int ExtractCallbackID(const IPC::Message& msg);
+  static int ExtractThreadID(int callback_id);
+  static int InjectThreadID(int callback_id, int thread_id);
+
+  scoped_refptr<base::MessageLoopProxy> main_thread_loop_proxy_;
+  base::ThreadLocalPointer<IndexedDBDispatcher> idb_dispatcher_tls_;
+  base::AtomicSequenceNumber unique_id_;
+  CallbackIDToRunLoopMap transaction_id_to_run_loop_;
+  base::Lock map_lock_;
+
+  class MsgForwarderTask;
+  DISALLOW_COPY_AND_ASSIGN(IndexedDBMessageFilter);
+};
+
+#endif  // CONTENT_RENDERER_INDEXED_DB_DISPATCHER_H_