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Using Camel with CDI
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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.cdi;

import java.util.function.Function;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.CreationException;
import javax.enterprise.inject.UnsatisfiedResolutionException;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;

import org.apache.camel.CamelContext;
import org.apache.camel.Consumer;
import org.apache.camel.Endpoint;
import org.apache.camel.FailedToCreateConsumerException;
import org.apache.camel.component.bean.BeanProcessor;
import org.apache.camel.core.xml.CamelServiceExporterDefinition;

import static org.apache.camel.cdi.BeanManagerHelper.getReference;
import static org.apache.camel.cdi.BeanManagerHelper.getReferenceByName;
import static org.apache.camel.util.CamelContextHelper.getMandatoryEndpoint;
import static org.apache.camel.util.ObjectHelper.isNotEmpty;
import static org.apache.camel.util.ServiceHelper.startService;

final class XmlServiceExporterBean extends SyntheticBean {

    private final BeanManager manager;

    private final Bean context;

    private final CamelServiceExporterDefinition exporter;

    private final Class type;

    XmlServiceExporterBean(BeanManager manager, SyntheticAnnotated annotated, Class type, Function, String> toString, Bean context, CamelServiceExporterDefinition exporter) {
        super(manager, annotated, type, null, toString);
        this.manager = manager;
        this.context = context;
        this.exporter = exporter;
        this.type = type;
    }

    @Override
    public T create(CreationalContext creationalContext) {
        try {
            CamelContext context = isNotEmpty(exporter.getCamelContextId())
                ? getReferenceByName(manager, exporter.getCamelContextId(), CamelContext.class).get()
                : getReference(manager, CamelContext.class, this.context);

            Bean bean = manager.resolve(manager.getBeans(exporter.getServiceRef()));
            if (bean == null) {
                throw new UnsatisfiedResolutionException("No bean with name [" + exporter.getServiceRef() + "] is deployed!");
            }

            @SuppressWarnings("unchecked")
            T service = (T) manager.getReference(bean, type, manager.createCreationalContext(bean));

            Endpoint endpoint = getMandatoryEndpoint(context, exporter.getUri());
            try {
                // need to start endpoint before we create consumer
                startService(endpoint);
                Consumer consumer = endpoint.createConsumer(new BeanProcessor(service, context));
                // add and start consumer
                context.addService(consumer, true, true);
            } catch (Exception cause) {
                throw new FailedToCreateConsumerException(endpoint, cause);
            }

            return service;
        } catch (Exception cause) {
            throw new CreationException("Error while creating instance for " + this, cause);
        }
    }

    @Override
    public void destroy(T instance, CreationalContext creationalContext) {
        // We let the Camel context manage the lifecycle of the consumer and
        // shut it down when Camel stops.
    }
}