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package org.glassfish.hk2.api.messaging;

import org.jvnet.hk2.annotations.Contract;

/**
 * This service is responsible for distributing messages to Topic subscribers
 * 
 * A default implementation of this service is provided by HK2 and can
 * be added to the system with the
 * {@link org.glassfish.hk2.utilities.ServiceLocatorUtilities#enableTopicDistribution(org.glassfish.hk2.api.ServiceLocator)}
 * method.  The default implementation will be named "HK2TopicDistributionService"
 * 
 * @author jwells
 *
 */
@Contract
public interface TopicDistributionService {
    /** The name of the default TopicDistributionService that is added by {@link org.glassfish.hk2.utilities.ServiceLocatorUtilities} */
    public final static String HK2_DEFAULT_TOPIC_DISTRIBUTOR = "HK2TopicDistributionService";
    
    /**
     * Must distribute the message to all of the matching topic subscribers.  Any exception
     * thrown from this method will be ignored.  Instead error handling should
     * be performed by the implementation of this message
     * 
     * @param topic The topic to which to distribute the message.  Must not be null
     * @param message The message to send to the topic.  Must not be null
     */
    public void distributeMessage(Topic topic, Object message);

}