net.sf.jrtps.udds.security.ParticipantStatelessMessageListener Maven / Gradle / Ivy

package net.sf.jrtps.udds.security;

import java.util.List;

import net.sf.jrtps.rtps.Sample;
import net.sf.jrtps.types.EntityId;
import net.sf.jrtps.types.Guid;
import net.sf.jrtps.udds.Participant;
import net.sf.jrtps.udds.SampleListener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * ParticipantStatelessMessageListener. This class listens samples from remote 
 * ParticipantStatelessMessageWriter and makes appropriate calls to AuthenticationPlugin 
 * so that authentication and key exchange can be executed.  
 * 
 * @author mcr70
 */
class ParticipantStatelessMessageListener implements SampleListener {
	private static final Logger logger = LoggerFactory.getLogger(JKSAuthenticationPlugin.AUTH_LOG_CATEGORY);
	private final Guid participantGuid;
	private final Guid statelessReaderGuid;
	private final JKSAuthenticationPlugin authPlugin;

	ParticipantStatelessMessageListener(Participant p, JKSAuthenticationPlugin authPlugin) {
		this.authPlugin = authPlugin;
		this.participantGuid = p.getGuid();
		this.statelessReaderGuid = new Guid(participantGuid.getPrefix(), EntityId.BUILTIN_PARTICIPANT_STATELESS_READER);
	}
	
	// ----  SampleListener  ------------------------
	@Override
	public void onSamples(List> samples) {
		for (Sample sample : samples) {
			ParticipantStatelessMessage psm = sample.getData();

			if (!(psm.destination_participant_key.equals(participantGuid) ||
					psm.destination_participant_key.equals(Guid.GUID_UNKNOWN))) {
				logger.debug("ParticipantStatelessMessage participant_key({}) is not destined to this participant({})",
						psm.destination_participant_key, participantGuid);
				continue;
			}

			if (!(psm.destination_endpoint_key.equals(statelessReaderGuid) ||
					psm.destination_endpoint_key.equals(Guid.GUID_UNKNOWN))) {
				logger.debug("ParticipantStatelessMessage endpoint_key({}) is not destined to local StatelessMessageRader({})",
						psm.destination_endpoint_key, statelessReaderGuid);
				continue;
			}

			if (psm.message_data == null || psm.message_data.length == 0) {
				logger.warn("ParticipantStatelessMessage does not contain any message_data");
			}
			
			logger.debug("Got ParticipantStatelessMessage from {}", psm.source_endpoint_key.getPrefix());
			authPlugin.doHandshake(psm);
		}
	}
}