Add interfaces for most major Blimp net components.

blimp/net/blimp_message_multiplexer.h

Index: blimp/net/blimp_message_multiplexer.h
diff --git a/blimp/net/blimp_message_multiplexer.h b/blimp/net/blimp_message_multiplexer.h
new file mode 100644
index 0000000000000000000000000000000000000000..e01a1743c171c6449063bd0c22d10221684881af
--- /dev/null
+++ b/blimp/net/blimp_message_multiplexer.h
@@ -0,0 +1,63 @@
+// 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 BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_
+#define BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "blimp/common/proto/blimp_message.pb.h"
+#include "blimp/net/blimp_message_processor.h"
+#include "blimp/net/blimp_net_export.h"
+#include "net/base/completion_callback.h"
+
+namespace blimp {
+
+class BlimpConnection;
+
+// Creates MessageProcessors that receive outgoing messages and multiplex them
+// on to a single output message processor.
+class BLIMP_NET_EXPORT BlimpMessageMultiplexer {
+ public:
+  // |output_processor|: A pointer to the MessageProcessor that will receive the
+  // multiplexed message stream.
+  explicit BlimpMessageMultiplexer(
+      base::WeakPtr<BlimpMessageProcessor> output_processor);
+
+  ~BlimpMessageMultiplexer();
+
+  // Creates a BlimpMessageProcessor object for sending messages of type |type|.
+  // Any number of senders can be created at a time for a given type.
+  scoped_ptr<BlimpMessageProcessor> CreateSenderForType(
+      BlimpMessage::Type type);
+
+ private:
+  class MultiplexedSender : public BlimpMessageProcessor {
+   public:
+    MultiplexedSender(base::WeakPtr<BlimpMessageProcessor> output_processor,
+                      BlimpMessage::Type type);
+    ~MultiplexedSender() override;
+
+    // BlimpMessageProcessor implementation.
+    // |message.type| should not be set at the time of calling ProcessMessage.
+    void ProcessMessage(const BlimpMessage& message,
+                        const net::CompletionCallback& callback) override;
+
+   private:
+    base::WeakPtr<BlimpMessageProcessor> output_processor_;
+    BlimpMessage::Type type_;
+
+    DISALLOW_COPY_AND_ASSIGN(MultiplexedSender);
+  };
+  friend class MultiplexedSender;
+
+  base::WeakPtr<BlimpMessageProcessor> output_processor_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpMessageMultiplexer);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_NET_BLIMP_MESSAGE_MULTIPLEXER_H_