src/main/java/org/apache/sling/commons/messaging/mail/internal/SimpleMessageIdProvider.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.sling.commons.messaging.mail.internal;

import java.util.UUID;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.apache.sling.commons.messaging.mail.MessageIdProvider;
import org.jetbrains.annotations.NotNull;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;
import org.osgi.service.component.annotations.Modified;
import org.osgi.service.metatype.annotations.Designate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Component(
    property = {
        Constants.SERVICE_DESCRIPTION + "=Apache Sling Commons Messaging Mail – Simple Message ID Provider",
        Constants.SERVICE_VENDOR + "=The Apache Software Foundation"
    }
)
@Designate(
    ocd = SimpleMessageIdProviderConfiguration.class,
    factory = true
)
public class SimpleMessageIdProvider implements MessageIdProvider {

    private SimpleMessageIdProviderConfiguration configuration;

    private final Logger logger = LoggerFactory.getLogger(SimpleMessageIdProvider.class);

    @Activate
    private void activate(final SimpleMessageIdProviderConfiguration configuration) {
        logger.debug("activating");
        this.configuration = configuration;
    }

    @Modified
    private void modified(final SimpleMessageIdProviderConfiguration configuration) {
        logger.debug("modifying");
        this.configuration = configuration;
    }

    @Deactivate
    private void deactivate() {
        logger.debug("deactivating");
        this.configuration = null;
    }

    @Override
    public @NotNull String getMessageId(@NotNull MimeMessage message) throws MessagingException {
        return String.format("%s.%s@%s", UUID.randomUUID().toString(), System.currentTimeMillis(), configuration.host());
    }

}