core/camel-core/src/test/java/org/apache/camel/processor/DeadLetterChannelRedeliveryDelayPatternTest.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;

import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.util.StopWatch;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * Unit test to verify delay pattern
 */
public class DeadLetterChannelRedeliveryDelayPatternTest extends ContextTestSupport {

    private static int counter;

    @Test
    public void testDelayPatternTest() throws Exception {
        counter = 0;

        MockEndpoint mock = getMockEndpoint("mock:error");
        mock.expectedMessageCount(1);

        StopWatch watch = new StopWatch();
        template.sendBody("direct:start", "Hello World");
        long delta = watch.taken();
        assertTrue(delta > 1000, "Should be slower");

        assertMockEndpointsSatisfied();

        assertEquals(3, counter);
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            public void configure() {
                errorHandler(deadLetterChannel("mock:error").delayPattern("0:250;2:500").maximumRedeliveries(3)
                        .onRedelivery(new Processor() {
                            public void process(Exchange exchange) {
                                counter++;
                            }
                        }));

                from("direct:start").throwException(new Exception("Forced exception by unit test"));
            }
        };
    }

}