components/camel-pulsar/src/main/java/org/apache/camel/component/pulsar/PulsarMessageListener.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.camel.component.pulsar;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.pulsar.utils.message.PulsarMessageUtils;
import org.apache.camel.spi.ExceptionHandler;
import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.MessageListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PulsarMessageListener implements MessageListener<byte[]> {

    private static final Logger LOGGER = LoggerFactory.getLogger(PulsarMessageListener.class);

    private final PulsarEndpoint endpoint;
    private final ExceptionHandler exceptionHandler;
    private final Processor processor;

    public PulsarMessageListener(PulsarEndpoint endpoint, ExceptionHandler exceptionHandler, Processor processor) {
        this.endpoint = endpoint;
        this.exceptionHandler = exceptionHandler;
        this.processor = processor;
    }

    @Override
    public void received(final Consumer<byte[]> consumer, final Message<byte[]> message) {
        final Exchange exchange = PulsarMessageUtils.updateExchange(message, endpoint.createExchange());

        try {
            processor.process(exchange);
            consumer.acknowledge(message.getMessageId());
        } catch (Exception exception) {
            handleProcessorException(exchange, exception);
        }
    }

    private void handleProcessorException(final Exchange exchange, final Exception exception) {
        final Exchange exchangeWithException = PulsarMessageUtils
            .updateExchangeWithException(exception, exchange);

        exceptionHandler.handleException("An error occurred", exchangeWithException, exception);
    }
}