net.lshift.accent.ConnectionBehaviourTest.java Source code

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Here is the source code for net.lshift.accent.ConnectionBehaviourTest.java

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/**
 * Copyright (C) 2011 LShift Ltd.
 *
 * Licensed 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
 * limitations under the License.
 */
package net.lshift.accent;

import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import org.easymock.classextension.EasyMock;
import org.junit.Test;

import java.io.IOException;
import java.net.ConnectException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import static org.easymock.EasyMock.expect;
import static org.easymock.classextension.EasyMock.createMock;
import static org.easymock.classextension.EasyMock.replay;
import static org.junit.Assert.assertTrue;

/**
 * Behaviour based tests for Accent based on a mock connection.
 */
public class ConnectionBehaviourTest {
    @Test
    public void shouldKeepAttemptingToReconnect() throws Exception {
        // Create a connection factory that never returns a valid connection
        ConnectionFactory unconnectableFactory = createMock(ConnectionFactory.class);
        expect(unconnectableFactory.newConnection()).andStubThrow(new ConnectException("Boom"));
        replay(unconnectableFactory);

        // We want to see 4 attempts to connect
        final CountDownLatch attemptLatch = new CountDownLatch(4);
        ConnectionFailureListener eventingListener = new ConnectionFailureListener() {
            @Override
            public void connectionFailure(Exception e) {
                if (e instanceof ConnectException) {
                    attemptLatch.countDown();
                } else {
                    System.out.println("WARNING: Received unexpected exception - " + e);
                }
            }
        };

        // Create the connection, and wait for the countdown to reach 0
        AccentConnection conn = new AccentConnection(unconnectableFactory, eventingListener);
        assertTrue(attemptLatch.await(5000, TimeUnit.MILLISECONDS));
    }
}