[jira] [Created] (CAMEL-4371) Add an ability to replace endpoints

[Sergey Zhemzhitsky (JIRA)]

Add an ability to replace endpoints
-----------------------------------

                 Key: CAMEL-4371
                 URL: https://issues.apache.org/jira/browse/CAMEL-4371
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
    Affects Versions: 2.8.0
            Reporter: Sergey Zhemzhitsky


Sometimes it can be useful to replace endpoints in the camel context. For 
example, in unit tests it will not be necessary to define multiple properties 
file for different environments with placeholders.

Here is the endpoint strategy to replace endpoints

{code}
package org.apache.camel.impl;

public class ReplaceEndpointStrategy implements EndpointStrategy {

    private Map<String, String> replacements = Collections.emptyMap();

    @Override
    public Endpoint registerEndpoint(String uri, Endpoint endpoint) {
        CamelContext context = endpoint.getCamelContext();

        for(Entry<String, String> entry : replacements.entrySet()) {
            if(EndpointHelper.matchEndpoint(uri, entry.getKey())) {
                Endpoint newEndpoint = context.getEndpoint(entry.getValue());
                return newEndpoint;
            }
        }

        return endpoint;
    }

    public void setReplacements(Map<String, String> replacements) {
        this.replacements = replacements;
    }

}
{code}

Here is it can be used from spring

{code}
<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://camel.apache.org/schema/spring 
http://camel.apache.org/schema/spring/camel-spring.xsd
    ">

    <bean class="org.apache.camel.impl.ReplaceEndpointStrategy">
        <property name="replacements">
            <map>
                <entry key="timer://test*" value="direct://start" />
                <entry key="log://timer*" value="mock://tick" />
            </map>
        </property>
    </bean>

    <camelContext xmlns="http://camel.apache.org/schema/spring";>
        <route>
            <from uri="timer://testTimer" />
            <to uri="log://timerTick" />
        </route>
    </camelContext>

</beans>
{code}

And the unit test
{code}
package org.apache.camel.impl;

import static org.junit.Assert.assertNotNull;

import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.component.mock.MockEndpoint;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class ReplaceEndpointStrategyTest {

    @Autowired
    private CamelContext camelContext;

    @Autowired
    private ProducerTemplate producer;

    @Test
    public void registerEndpoint() throws Exception {
        assertNotNull("direct:start is null", 
camelContext.hasEndpoint("direct:start"));
        assertNotNull("mock:tick is null", 
camelContext.hasEndpoint("mock:tick"));
    }

    @Test
    public void route() throws Exception {
        Endpoint start = camelContext.hasEndpoint("direct:start");
        MockEndpoint complete = (MockEndpoint) 
camelContext.hasEndpoint("mock:tick");

        complete.expectedBodiesReceived("Hello World!");
        producer.sendBody(start, "Hello World!");
        complete.assertIsSatisfied();
    }

}
{code}

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