--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.chromium.sdk/src/org/chromium/sdk/internal/protocol/IncomingMessage.java	Wed Dec 23 17:13:18 2009 -0800
@@ -0,0 +1,25 @@
+// Copyright (c) 2009 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.
+
+package org.chromium.sdk.internal.protocol;
+
+import org.chromium.sdk.internal.protocolparser.JsonSubtypeCasting;
+import org.chromium.sdk.internal.protocolparser.JsonType;
+
+/**
+ * A base type for all incoming message from debugger. There are 2 kinds of messages: response
+ * to a command and event notification. All messages must have unique sequence id.
+ */
+@JsonType
+public interface IncomingMessage {
+  long getSeq();
+
+  MessageType getType();
+
+  @JsonSubtypeCasting
+  CommandResponse asCommandResponse();
+
+  @JsonSubtypeCasting
+  EventNotification asEventNotification();
+}