cassandra-trunk/test/unit/org/apache/cassandra/net/MockMessagingServiceTest.java
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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 */
package org.apache.cassandra.net;

import java.util.concurrent.ExecutionException;

import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.FBUtilities;

import static org.apache.cassandra.net.Verb.ECHO_REQ;
import static org.apache.cassandra.net.MockMessagingService.all;
import static org.apache.cassandra.net.MockMessagingService.to;
import static org.apache.cassandra.net.MockMessagingService.verb;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;

public class MockMessagingServiceTest
{
    @BeforeClass
    public static void initCluster() throws ConfigurationException
    {
        SchemaLoader.prepareServer();
        StorageService.instance.initServer();
    }

    @Before
    public void cleanup()
    {
        MockMessagingService.cleanup();
    }

    @Test
    public void testRequestResponse() throws InterruptedException, ExecutionException
    {
        // echo message that we like to mock as incoming response for outgoing echo message
        Message<NoPayload> echoMessage = Message.out(ECHO_REQ, NoPayload.noPayload);
        MockMessagingSpy spy = MockMessagingService
                .when(
                        all(
                                to(FBUtilities.getBroadcastAddressAndPort()),
                                verb(ECHO_REQ)
                        )
                )
                .respond(echoMessage);

        Message<NoPayload> echoMessageOut = Message.out(ECHO_REQ, NoPayload.noPayload);
        MessagingService.instance().sendWithCallback(echoMessageOut, FBUtilities.getBroadcastAddressAndPort(), msg ->
        {
            assertEquals(ECHO_REQ, msg.verb());
            assertEquals(echoMessage.payload, msg.payload);
        });

        // we must have intercepted the outgoing message at this point
        Message<?> msg = spy.captureMessageOut().get();
        assertEquals(1, spy.messagesIntercepted());
        assertSame(echoMessage.payload, msg.payload);

        // and return a mocked response
        Util.spinAssertEquals(1, spy::mockedMessageResponses, 60);
    }
}
