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

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.camel.ContextTestSupport;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.saga.InMemorySagaService;
import org.junit.jupiter.api.Test;

public class SagaFailuresTest extends ContextTestSupport {

    private AtomicInteger maxFailures;

    @Test
    public void testCompensationAfterFailures() throws Exception {
        maxFailures = new AtomicInteger(2);

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

        sendBody("direct:saga-compensate", "hello");

        compensate.assertIsSatisfied();
    }

    @Test
    public void testNoCompensationAfterMaxFailures() throws Exception {
        maxFailures = new AtomicInteger(3);

        MockEndpoint compensate = getMockEndpoint("mock:compensate");
        compensate.expectedMessageCount(1);
        compensate.setResultWaitTime(200);

        sendBody("direct:saga-compensate", "hello");

        compensate.assertIsNotSatisfied();
    }

    @Test
    public void testCompletionAfterFailures() throws Exception {
        maxFailures = new AtomicInteger(2);

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

        MockEndpoint end = getMockEndpoint("mock:end");
        end.expectedBodiesReceived("hello");

        sendBody("direct:saga-complete", "hello");

        complete.assertIsSatisfied();
        end.assertIsSatisfied();
    }

    @Test
    public void testNoCompletionAfterMaxFailures() throws Exception {
        maxFailures = new AtomicInteger(3);

        MockEndpoint complete = getMockEndpoint("mock:complete");
        complete.expectedMessageCount(1);
        complete.setResultWaitTime(200);

        MockEndpoint end = getMockEndpoint("mock:end");
        end.expectedBodiesReceived("hello");

        sendBody("direct:saga-complete", "hello");

        complete.assertIsNotSatisfied();
        end.assertIsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() {

        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {

                InMemorySagaService sagaService = new InMemorySagaService();
                sagaService.setMaxRetryAttempts(3);
                sagaService.setRetryDelayInMilliseconds(20);
                context.addService(sagaService);

                from("direct:saga-compensate").saga().compensation("direct:compensate").process(x -> {
                    throw new RuntimeException("fail");
                });

                from("direct:saga-complete").saga().completion("direct:complete").to("mock:end");

                from("direct:compensate").process(x -> {
                    int current = maxFailures.decrementAndGet();
                    if (current >= 0) {
                        throw new RuntimeException("compensation failure");
                    }
                }).to("mock:compensate");

                from("direct:complete").process(x -> {
                    int current = maxFailures.decrementAndGet();
                    if (current >= 0) {
                        throw new RuntimeException("completion failure");
                    }
                }).to("mock:complete");

            }
        };
    }

}