camel-core/src/test/java/org/apache/camel/processor/MDCResetTest.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.slf4j.MDC;

/**
 * Tests that MDC works as a stack remembering old values
 * when using a producer template to send in new messages during routing.
 *
 * @version 
 */
public class MDCResetTest extends ContextTestSupport {

    public void testMDC() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("Good Afternoon World");

        template.sendBody("direct:a", "Hello World");

        assertMockEndpointsSatisfied();
    }

    public void testMDCTwoMessages() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("Good Afternoon World", "Good Afternoon World");

        template.sendBody("direct:a", "Hello World");
        template.sendBody("direct:a", "Bye World");

        assertMockEndpointsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                // enable MDC
                context.setUseMDCLogging(true);

                from("direct:a").routeId("route-a")
                        .process(new Processor() {
                            public void process(Exchange exchange) throws Exception {
                                assertEquals("route-a", MDC.get("camel.routeId"));
                                assertEquals(exchange.getExchangeId(), MDC.get("camel.exchangeId"));
                            }
                        })
                        .to("log:foo").to("direct:b")
                        .process(new Processor() {
                            public void process(Exchange exchange) throws Exception {
                                String body = exchange.getIn().getBody(String.class);
                                // use a producer template to send to b, instead of in the route DSL
                                body = template.requestBody("direct:b", body, String.class);
                                exchange.getOut().setBody(body);
                            }
                        })
                        .process(new Processor() {
                            public void process(Exchange exchange) throws Exception {
                                assertEquals("route-a", MDC.get("camel.routeId"));
                                assertEquals(exchange.getExchangeId(), MDC.get("camel.exchangeId"));
                            }
                        })
                        .to("log:result").to("mock:result");

                from("direct:b").routeId("route-b")
                        .process(new Processor() {
                            public void process(Exchange exchange) throws Exception {
                                assertEquals("route-b", MDC.get("camel.routeId"));
                                assertEquals(exchange.getExchangeId(), MDC.get("camel.exchangeId"));

                                exchange.getOut().setBody("Good Afternoon World");
                            }
                        })
                        .to("log:bar");
            }
        };
    }
}