MessageBusConfiguration.java

/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed 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.springframework.xd.dirt.plugins.spark.streaming;

import java.util.Properties;

import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
import org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration;
import org.springframework.boot.autoconfigure.redis.RedisAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.ImportResource;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.xd.dirt.server.MessageBusExtensionsConfiguration;
import org.springframework.xd.dirt.util.ConfigLocations;

/**
 * Configuration for the MessageBus used by the {@link MessageBusReceiver} and {@link MessageBusSender}.
 *
 * @author Ilayaperumal Gopinathan
 * @since 1.1
 */
@Configuration
@Import(PropertyPlaceholderAutoConfiguration.class)
@ImportResource({"classpath*:" + ConfigLocations.XD_CONFIG_ROOT + "bus/${XD_TRANSPORT}-bus.xml"})
class MessageBusConfiguration {

	private static final String RABBIT_ACKMODE_PROPERTY = "xd.messagebus.rabbit.default.ackMode";

	private static final String KAFKA_AUTO_OFFSET_COMMIT_PROPERTY = "xd.messagebus.kafka.default.autoOffsetCommitEnabled";

	private static final String CODEC_KRYO_REFERENCES = "xd.codec.kryo.references";

	/**
	 * This method called by {@link MessageBusReceiver} and {@link MessageBusSender} to setup
	 * message bus configuration at the spark module executor process. This configuration
	 * should use the same properties configured in XD container that deployed the spark
	 * streaming module.
	 *
	 * @param properties the message bus properties
	 * @return the application context that has MessageBus bean
	 */
	static ConfigurableApplicationContext createApplicationContext(final Properties properties) {
		String transport = properties.getProperty("XD_TRANSPORT");
		// Set Rabbit message bus acknowledgement mode to 'MANUAL'
		properties.setProperty(RABBIT_ACKMODE_PROPERTY, "MANUAL");
		properties.setProperty(KAFKA_AUTO_OFFSET_COMMIT_PROPERTY, "false");
		properties.setProperty(CODEC_KRYO_REFERENCES, "true");
		SpringApplicationBuilder application = new SpringApplicationBuilder()
				.sources(MessageBusConfiguration.class)
				// ensure the properties are added at the first precedence level
				.listeners(new ApplicationListener<ApplicationEnvironmentPreparedEvent>() {
					@Override
					public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
						event.getEnvironment().getPropertySources().addFirst(
								new PropertiesPropertySource("executorEnvironment", properties));
					}
				})
				.web(false)
				.showBanner(false);
		application.sources(MessageBusExtensionsConfiguration.class);
		if (transport.equals("rabbit")) {
			application.sources(RabbitAutoConfiguration.class);
		}
		else if (transport.equals("redis")) {
			application.sources(RedisAutoConfiguration.class);
		}
		application.run();
		return application.context();
	}
}