Blimp: create MessageDispatcher class.

blimp/net/blimp_message_dispatcher.cc

Index: blimp/net/blimp_message_dispatcher.cc
diff --git a/blimp/net/blimp_message_dispatcher.cc b/blimp/net/blimp_message_dispatcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8c07c9f3bd566feecc9bf98fb637c6af2bea085d
--- /dev/null
+++ b/blimp/net/blimp_message_dispatcher.cc
@@ -0,0 +1,45 @@
+// 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.
+
+#include "blimp/net/blimp_message_dispatcher.h"
+
+#include <string>
+
+#include "base/strings/stringprintf.h"
+
+namespace blimp {
+namespace {
+
+std::string BlimpMessageToDebugString(const BlimpMessage& message) {
+  return base::StringPrintf("<message type=%d>", message.type());
+}
+
+}  // namespace
+
+BlimpMessageDispatcher::BlimpMessageDispatcher() {}
+
+BlimpMessageDispatcher::~BlimpMessageDispatcher() {}
+
+void BlimpMessageDispatcher::AddReceiver(BlimpMessage::Type type,
+                                         BlimpMessageReceiver* receiver) {
+  DCHECK(receiver);
+  if (feature_receiver_map_.find(type) == feature_receiver_map_.end()) {
+    feature_receiver_map_.insert(std::make_pair(type, receiver));
+  } else {
+    DLOG(FATAL) << "Handler already registered for type=" << type << ".";
+  }
+}
+
+net::Error BlimpMessageDispatcher::OnBlimpMessage(const BlimpMessage& message) {
+  auto receiver_iter = feature_receiver_map_.find(message.type());
+  if (receiver_iter == feature_receiver_map_.end()) {
+    DLOG(FATAL) << "No registered receiver for "
+                << BlimpMessageToDebugString(message) << ".";
+    return net::ERR_NOT_IMPLEMENTED;
+  }
+
+  return receiver_iter->second->OnBlimpMessage(message);
+}
+
+}  // namespace blimp