/*
* 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.nifi.cdc.mysql.event;
import com.github.shyiko.mysql.binlog.BinaryLogClient;
import com.github.shyiko.mysql.binlog.event.Event;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* An event listener wrapper for MYSQL binlog events generated from the mysql-binlog-connector.
*/
public class BinlogEventListener implements BinaryLogClient.EventListener {
protected final AtomicBoolean stopNow = new AtomicBoolean(false);
private static final int QUEUE_OFFER_TIMEOUT_MSEC = 100;
private final BlockingQueue<RawBinlogEvent> queue;
private final BinaryLogClient client;
public BinlogEventListener(BinaryLogClient client, BlockingQueue<RawBinlogEvent> q) {
this.client = client;
this.queue = q;
}
public void start() {
stopNow.set(false);
}
public void stop() {
stopNow.set(true);
}
@Override
public void onEvent(Event event) {
while (!stopNow.get()) {
RawBinlogEvent ep = new RawBinlogEvent(event, client.getBinlogFilename());
try {
if (queue.offer(ep, QUEUE_OFFER_TIMEOUT_MSEC, TimeUnit.MILLISECONDS)) {
return;
} else {
throw new RuntimeException("Unable to add event to the queue");
}
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while adding event to the queue");
}
}
}
}