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The Core Camel Java DSL based router
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/**
 * 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.impl;

import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.FailedToCreateProducerException;
import org.apache.camel.Producer;
import org.apache.camel.util.ServiceHelper;

/**
 * A {@link org.apache.camel.impl.ProducerCache} which is always empty and does not cache any {@link org.apache.camel.Producer}s.
 */
public class EmptyProducerCache extends ProducerCache {

    public EmptyProducerCache(Object source, CamelContext camelContext) {
        super(source, camelContext, 0);
    }

    @Override
    public Producer acquireProducer(Endpoint endpoint) {
        // always create a new producer
        Producer answer;
        try {
            answer = endpoint.createProducer();
            if (getCamelContext().isStartingRoutes() && answer.isSingleton()) {
                // if we are currently starting a route, then add as service and enlist in JMX
                // - but do not enlist non-singletons in JMX
                // - note addService will also start the service
                getCamelContext().addService(answer);
            } else {
                // must then start service so producer is ready to be used
                ServiceHelper.startService(answer);
            }
        } catch (Exception e) {
            throw new FailedToCreateProducerException(endpoint, e);
        }
        return answer;
    }

    @Override
    public void releaseProducer(Endpoint endpoint, Producer producer) throws Exception {
        // stop and shutdown the producer as its not cache or reused
        ServiceHelper.stopAndShutdownService(producer);
    }

    @Override
    public String toString() {
        return "EmptyProducerCache for source: " + getSource();
    }

}