Mojo: Abstract out the endpoints of MessagePipes.

mojo/system/local_message_pipe_endpoint.h

+// Copyright 2013 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 MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
+#define MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
+
+#include <deque>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "mojo/public/system/core.h"
+#include "mojo/system/message_pipe_endpoint.h"
+#include "mojo/system/waiter_list.h"
+
+namespace mojo {
+namespace system {
+
+class MessageInTransit;
+
+class LocalMessagePipeEndpoint : public MessagePipeEndpoint {
+ public:
+  LocalMessagePipeEndpoint();
+  virtual ~LocalMessagePipeEndpoint();
+
+  // |MessagePipeEndpoint| implementation:
+  virtual void OnPeerClose() OVERRIDE;
+  virtual MojoResult EnqueueMessage(
+      const void* bytes, uint32_t num_bytes,
+      const MojoHandle* handles, uint32_t num_handles,
+      MojoWriteMessageFlags flags) OVERRIDE;
+
+  // There's a dispatcher for |LocalMessagePipeEndpoint|s, so we have to
+  // implement/override these:
+  virtual void CancelAllWaiters() OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual MojoResult ReadMessage(void* bytes, uint32_t* num_bytes,
+                                 MojoHandle* handles, uint32_t* num_handles,
+                                 MojoReadMessageFlags flags) OVERRIDE;
+  virtual MojoResult AddWaiter(Waiter* waiter,
+                               MojoWaitFlags flags,
+                               MojoResult wake_result) OVERRIDE;
+  virtual void RemoveWaiter(Waiter* waiter) OVERRIDE;
+
+ private:
+  MojoWaitFlags SatisfiedFlags();
+  MojoWaitFlags SatisfiableFlags();
+
+  bool is_open_;
+  bool is_peer_open_;
+
+  std::deque<MessageInTransit*> message_queue_;
+  WaiterList waiter_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalMessagePipeEndpoint);
+};
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_