camel-2.8.x/tests/camel-itest/src/test/java/org/apache/camel/itest/jetty/JettyFailoverRoundRobinTest.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.itest.jetty;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.Test;

/**
 * @version 
 */
public class JettyFailoverRoundRobinTest extends CamelTestSupport {

    private String bad = "jetty:http://localhost:8871/bad";
    private String bad2 = "jetty:http://localhost:8872/bad2";
    private String good = "jetty:http://localhost:8873/good";
    private String good2 = "jetty:http://localhost:8874/good2";

    @Test
    public void testJettyFailoverRoundRobin() throws Exception {
        getMockEndpoint("mock:bad").expectedMessageCount(1);
        getMockEndpoint("mock:bad2").expectedMessageCount(1);
        getMockEndpoint("mock:good").expectedMessageCount(1);
        getMockEndpoint("mock:good2").expectedMessageCount(0);

        String reply = template.requestBody("direct:start", null, String.class);
        assertEquals("Good", reply);

        assertMockEndpointsSatisfied();

        // reset mocks and send a message again to see that round robin
        // continue where it should
        resetMocks();

        getMockEndpoint("mock:bad").expectedMessageCount(0);
        getMockEndpoint("mock:bad2").expectedMessageCount(0);
        getMockEndpoint("mock:good").expectedMessageCount(0);
        getMockEndpoint("mock:good2").expectedMessageCount(1);

        reply = template.requestBody("direct:start", null, String.class);
        assertEquals("Also good", reply);
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                // START SNIPPET: e1
                from("direct:start")
                    // load balance using failover in round robin mode.
                    // Also do not inherit error handler which means the failover LB will not fallback
                    // and use error handler but trigger failover to next endpoint immediately.
                    // -1 is to indicate that failover LB should newer exhaust and keep trying
                    .loadBalance().failover(-1, false, true)
                        // this is the four endpoints we will load balance with failover
                        .to(bad, bad2, good, good2);
                // END SNIPPET: e1

                from(bad)
                    .to("mock:bad")
                    .process(new Processor() {
                        public void process(Exchange exchange) throws Exception {
                            exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 500);
                            exchange.getIn().setBody("Something bad happened");
                        }
                    });

                from(bad2)
                    .to("mock:bad2")
                    .process(new Processor() {
                        public void process(Exchange exchange) throws Exception {
                            exchange.getIn().setHeader(Exchange.HTTP_RESPONSE_CODE, 404);
                            exchange.getIn().setBody("Not found");
                        }
                    });

                from(good)
                    .to("mock:good")
                    .process(new Processor() {
                        public void process(Exchange exchange) throws Exception {
                            exchange.getIn().setBody("Good");
                        }
                    });

                from(good2)
                    .to("mock:good2")
                    .process(new Processor() {
                        public void process(Exchange exchange) throws Exception {
                            exchange.getIn().setBody("Also good");
                        }
                    });
            }
        };
    }
}