io.fabric8.process.spring.boot.container.EmbeddedFabricSpringApplication Maven / Gradle / Ivy

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/**
 *  Copyright 2005-2014 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.process.spring.boot.container;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;

/**
 * 
 * Bean that can be added to the existing Spring application context in order to start embedded Fabric Spring Boot
 * context from within it. The embedding context (the one {@link EmbeddedFabricSpringApplication} has been added to)
 * will become a parent context for the embedded Fabric Spring Boot context.
 * 
 * 
 * Creating embedded Fabric application is as simple as that:
 * 
 *     @Bean
 *     EmbeddedFabricSpringApplication fabricSpringApplication() {
 *         return new EmbeddedFabricSpringApplication();
 *     }
 * 
 * For XML configuration the snippet above looks as follows:
 *  *   <bean class="io.fabric8.process.spring.boot.container.EmbeddedFabricSpringApplication" />
 * 
 * 
 * 
 * {@link EmbeddedFabricSpringApplication} automatically detects its patent Spring {@code ApplicationContext} and uses
 * it when starting up new embedded Fabric application.
 * 
 */
public class EmbeddedFabricSpringApplication implements ApplicationContextAware {

    private static final Logger LOG = LoggerFactory.getLogger(EmbeddedFabricSpringApplication.class);


    // Members

    /**
     * @see #context()
     */
    private ConfigurableApplicationContext context;

    // Lifecycle callbacks

    @Override
    public void setApplicationContext(ApplicationContext parent) throws BeansException {
        LOG.debug("Setting {} as a parent context for the embedded FabricSpringApplication.", parent);
        context = new FabricSpringApplication().parent((ConfigurableApplicationContext) parent).run();
        LOG.debug("Created embedded FabricSpringApplication: {}", context);
    }

    // Accessors

    /**
     * Embedded Fabric Spring Boot application context.
     *
     * @return embedded Spring Boot context
     */
    public ConfigurableApplicationContext context() {
        return context;
    }

}