KafkaIdempotentRepositoryNonEagerTest.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
 * limitations under the License.
 */
package org.apache.camel.processor.idempotent.kafka;

import org.apache.camel.CamelExecutionException;
import org.apache.camel.EndpointInject;
import org.apache.camel.RoutesBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.kafka.embedded.EmbeddedKafkaBroker;
import org.apache.camel.component.kafka.embedded.EmbeddedZookeeper;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.impl.JndiRegistry;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.Rule;
import org.junit.Test;

/**
 * Test for non-eager idempotentRepository usage.
 */
public class KafkaIdempotentRepositoryNonEagerTest extends CamelTestSupport {

    @Rule
    public EmbeddedZookeeper zookeeper = new EmbeddedZookeeper();

    @Rule
    public EmbeddedKafkaBroker kafkaBroker = new EmbeddedKafkaBroker(0, zookeeper.getConnection());

    private KafkaIdempotentRepository kafkaIdempotentRepository;

    @EndpointInject(uri = "mock:out")
    private MockEndpoint mockOut;

    @EndpointInject(uri = "mock:before")
    private MockEndpoint mockBefore;

    @Override
    protected JndiRegistry createRegistry() throws Exception {
        JndiRegistry jndi = super.createRegistry();

        kafkaIdempotentRepository = new KafkaIdempotentRepository("TEST_IDEM", kafkaBroker.getBrokerList());
        jndi.bind("kafkaIdempotentRepository", kafkaIdempotentRepository);

        return jndi;
    }

    @Override
    protected RoutesBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from("direct:in")
                    .to("mock:before")
                    .idempotentConsumer(header("id"))
                            .messageIdRepositoryRef("kafkaIdempotentRepository")
                            .eager(false)
                        .to("mock:out")
                    .end();
            }
        };
    }

    @Test
    public void testRemovesDuplicates() throws InterruptedException {
        for (int i = 0; i < 10; i++) {
            template.sendBodyAndHeader("direct:in", "Test message", "id", i % 5);
        }

        assertEquals(5, kafkaIdempotentRepository.getDuplicateCount());

        assertEquals(5, mockOut.getReceivedCounter());
        assertEquals(10, mockBefore.getReceivedCounter());
    }

    @Test
    public void testRollsBackOnException() throws InterruptedException {
        mockOut.whenAnyExchangeReceived(exchange -> {
            int id = exchange.getIn().getHeader("id", Integer.class);
            if (id == 0) {
                throw new IllegalArgumentException("Boom!");
            }
        });

        for (int i = 0; i < 10; i++) {
            try {
                template.sendBodyAndHeader("direct:in", "Test message", "id", i % 5);
            } catch (CamelExecutionException cex) {
                // no-op; expected
            }
        }

        assertEquals(4, kafkaIdempotentRepository.getDuplicateCount()); // id{0} is not a duplicate

        assertEquals(6, mockOut.getReceivedCounter()); // id{0} goes through the idempotency check twice
        assertEquals(10, mockBefore.getReceivedCounter());
    }

}