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

import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.PulsarClientException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class PulsarUtils {

    private static final Logger LOG = LoggerFactory.getLogger(PulsarUtils.class);

    private PulsarUtils() {
    }

    public static Queue<Consumer<byte[]>> stopConsumers(final Queue<Consumer<byte[]>> consumers) throws PulsarClientException {
        while (!consumers.isEmpty()) {
            Consumer<byte[]> consumer = consumers.poll();
            if (consumer != null) {
                try {
                    consumer.unsubscribe();
                    consumer.close();
                } catch (Exception e) {
                    // ignore during stopping
                    if (e instanceof PulsarClientException.AlreadyClosedException) {
                        // ignore
                    } else {
                        LOG.debug("Error stopping consumer: " + consumer + " due to " + e.getMessage() + ". This exception is ignored", e);
                    }
                }
            }
        }

        return new ConcurrentLinkedQueue<>();
    }
}