src/main/java/geode/kafka/source/GeodeKafkaSourceListener.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 geode.kafka.source;

import org.apache.geode.cache.query.CqEvent;
import org.apache.geode.cache.query.CqStatusListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

class GeodeKafkaSourceListener implements CqStatusListener {

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

    public String regionName;
    private BlockingQueue<GeodeEvent> eventBuffer;
    private boolean initialResultsLoaded;

    public GeodeKafkaSourceListener(BlockingQueue<GeodeEvent> eventBuffer, String regionName) {
        this.eventBuffer = eventBuffer;
        this.regionName = regionName;
        initialResultsLoaded = false;
    }

    @Override
    public void onEvent(CqEvent aCqEvent) {
        while (!initialResultsLoaded) {
            Thread.yield();
        }
        try {
            eventBuffer.offer(new GeodeEvent(regionName, aCqEvent), 2, TimeUnit.SECONDS);
        } catch (InterruptedException e) {

            while (true) {
                try {
                    if (!eventBuffer.offer(new GeodeEvent(regionName, aCqEvent), 2, TimeUnit.SECONDS))
                        break;
                } catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
                logger.info("GeodeKafkaSource Queue is full");
            }
        }
    }

    @Override
    public void onError(CqEvent aCqEvent) {

    }

    @Override
    public void onCqDisconnected() {
        //we should probably redistribute or reconnect
    }

    @Override
    public void onCqConnected() {

    }

    public void signalInitialResultsLoaded() {
        initialResultsLoaded = true;
    }
}