Adding a router class to handle messages that expect responses.

mojo/android/javatests/src/org/chromium/mojo/bindings/MessageHeaderTest.java

+// Copyright 2014 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.mojo.bindings;
+
+import android.test.suitebuilder.annotation.SmallTest;
+
+import junit.framework.TestCase;
+
+import org.chromium.mojo.bindings.test.mojom.imported.Point;
+
+/**
+ * Testing internal classes of interfaces.
+ */
+public class MessageHeaderTest extends TestCase {
+
+    /**
+     * Testing that headers are identical after being serialized/deserialized.
+     */
+    @SmallTest
+    public void testSimpleMessageHeader() {
+        final int xValue = 1;
+        final int yValue = 2;
+        final int type = 6;
+        Point p = new Point();
+        p.x = xValue;
+        p.y = yValue;
+        MessageWithHeader message = p.serializeWithHeader(null, new MessageHeader(type, 0));
+
+        MessageHeader header = message.getHeader();
+        assertTrue(header.validateHeader(type, 0));
+        assertEquals(type, header.getType());
+        assertEquals(0, header.getFlags());
+
+        Point p2 = Point.deserialize(message.getPayload());
+        assertNotNull(p2);
+        assertEquals(p.x, p2.x);
+        assertEquals(p.y, p2.y);
+    }
+
+    /**
+     * Testing that headers are identical after being serialized/deserialized.
+     */
+    @SmallTest
+    public void testMessageWithRequestIdHeader() {
+        final int xValue = 1;
+        final int yValue = 2;
+        final int type = 6;
+        final long requestId = 0x1deadbeafL;
+        Point p = new Point();
+        p.x = xValue;
+        p.y = yValue;
+        MessageWithHeader message = p.serializeWithHeader(null,
+                new MessageHeader(type, MessageHeader.MESSAGE_EXPECTS_RESPONSE_FLAG, 0));
+        message.setRequestId(requestId);
+
+        MessageHeader header = message.getHeader();
+        assertTrue(header.validateHeader(type, MessageHeader.MESSAGE_EXPECTS_RESPONSE_FLAG));
+        assertEquals(type, header.getType());
+        assertEquals(MessageHeader.MESSAGE_EXPECTS_RESPONSE_FLAG, header.getFlags());
+        assertEquals(requestId, header.getRequestId());
+
+        Point p2 = Point.deserialize(message.getPayload());
+        assertNotNull(p2);
+        assertEquals(p.x, p2.x);
+        assertEquals(p.y, p2.y);
+    }
+}