org.fcrepo.jms.headers.DefaultMessageFactory.java Source code

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Here is the source code for org.fcrepo.jms.headers.DefaultMessageFactory.java

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/**
 * Copyright 2014 DuraSpace, Inc.
 *
 * 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.fcrepo.jms.headers;

import static org.fcrepo.kernel.RdfLexicon.REPOSITORY_NAMESPACE;
import static org.slf4j.LoggerFactory.getLogger;

import java.io.IOException;
import java.util.Set;

import javax.jcr.RepositoryException;
import javax.jms.JMSException;
import javax.jms.Message;

import org.fcrepo.jms.observer.JMSEventMessageFactory;
import org.fcrepo.kernel.observer.FedoraEvent;
import org.fcrepo.kernel.utils.EventType;
import org.slf4j.Logger;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.Iterables;

/**
 * Generates JMS {@link Message}s composed entirely of headers, based entirely
 * on information found in the {@link FedoraEvent} that triggers publication.
 *
 * @author ajs6f
 * @date Dec 2, 2013
 */
public class DefaultMessageFactory implements JMSEventMessageFactory {

    public static final String TIMESTAMP_HEADER_NAME = REPOSITORY_NAMESPACE + "timestamp";

    public static final String IDENTIFIER_HEADER_NAME = REPOSITORY_NAMESPACE + "identifier";

    public static final String EVENT_TYPE_HEADER_NAME = REPOSITORY_NAMESPACE + "eventType";

    @Override
    public Message getMessage(final FedoraEvent jcrEvent, final javax.jms.Session jmsSession)
            throws RepositoryException, IOException, JMSException {
        final Message message = jmsSession.createMessage();
        message.setLongProperty(TIMESTAMP_HEADER_NAME, jcrEvent.getDate());
        message.setStringProperty(IDENTIFIER_HEADER_NAME, jcrEvent.getPath());
        message.setStringProperty(EVENT_TYPE_HEADER_NAME, getEventURIs(jcrEvent.getTypes()));
        return message;
    }

    private static String getEventURIs(final Set<Integer> types) {
        final String uris = Joiner.on(',').join(Iterables.transform(types, new Function<Integer, String>() {

            @Override
            public String apply(final Integer type) {
                return REPOSITORY_NAMESPACE + EventType.valueOf(type);
            }
        }));
        log.debug("Constructed event type URIs: {}", uris);
        return uris;
    }

    private static final Logger log = getLogger(DefaultMessageFactory.class);

}