第76章 JCache

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-jcache</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

cache://cacheName[?options]

JCacheIdempotentRepository idempotentRepo = new JCacheIdempotentRepository();
idempotentRepo.setCacheName("idempotent-cache")
 
from("direct:in")
    .idempotentConsumer(header("messageId"), idempotentRepo)
    .to("mock:out");

package org.apache.camel.component.jcache.processor.aggregate;

import org.apache.camel.EndpointInject;
import org.apache.camel.Exchange;
import org.apache.camel.Produce;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.processor.aggregate.AggregationStrategy;
import org.junit.Test;

public class JCacheAggregationRepositoryRoutesTest extends JCacheAggregationRepositoryTestSupport {
    private static final String MOCK_GOTCHA = "mock:gotcha";
    private static final String DIRECT_ONE = "direct:one";
    private static final String DIRECT_TWO = "direct:two";
    @EndpointInject(uri = MOCK_GOTCHA)
    private MockEndpoint mock;
    @Produce(uri = DIRECT_ONE)
    private ProducerTemplate produceOne;
    @Produce(uri = DIRECT_TWO)
    private ProducerTemplate produceTwo;
    @Test
    public void checkAggregationFromTwoRoutes() throws Exception {
        final JCacheAggregationRepository repoOne = createRepository(false);
        final JCacheAggregationRepository repoTwo = createRepository(false);
        final int completionSize = 4;
        final String correlator = "CORRELATOR";
        RouteBuilder rbOne = new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from(DIRECT_ONE).routeId("AggregatingRouteOne")
                    .aggregate(header(correlator))
                    .aggregationRepository(repoOne)
                    .aggregationStrategy(new MyAggregationStrategy())
                    .completionSize(completionSize)
                    .to(MOCK_GOTCHA);
            }
        };
        RouteBuilder rbTwo = new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from(DIRECT_TWO).routeId("AggregatingRouteTwo")
                    .aggregate(header(correlator))
                    .aggregationRepository(repoTwo)
                    .aggregationStrategy(new MyAggregationStrategy())
                    .completionSize(completionSize)
                    .to(MOCK_GOTCHA);
            }
        };
        context().addRoutes(rbOne);
        context().addRoutes(rbTwo);
        context().start();
        mock.expectedMessageCount(1);
        mock.expectedBodiesReceived(1 + 2 + 3 + 4);
        produceOne.sendBodyAndHeader(1, correlator, correlator);
        produceTwo.sendBodyAndHeader(2, correlator, correlator);
        produceOne.sendBodyAndHeader(3, correlator, correlator);
        produceOne.sendBodyAndHeader(4, correlator, correlator);
        mock.assertIsSatisfied();
    }
    private class MyAggregationStrategy implements AggregationStrategy {
        @Override
        public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
            if (oldExchange == null) {
                return newExchange;
            } else {
                Integer n = newExchange.getIn().getBody(Integer.class);
                Integer o = oldExchange.getIn().getBody(Integer.class);
                Integer v = (o == null ? 0 : o) + (n == null ? 0 : n);
                oldExchange.getIn().setBody(v, Integer.class);
                return oldExchange;
            }
        }
    }
    protected JCacheAggregationRepository createRepository(boolean optimistic) throws Exception {
        JCacheAggregationRepository repository = new JCacheAggregationRepository();
        repository.setConfiguration(new JCacheConfiguration());
        repository.setCacheName("aggregation-repository");
        repository.setOptimistic(optimistic);
        return repository;
    }
}