/*
* 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.samza.test.integration.join;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.apache.samza.config.Config;
import org.apache.samza.system.IncomingMessageEnvelope;
import org.apache.samza.task.InitableTask;
import org.apache.samza.task.MessageCollector;
import org.apache.samza.task.StreamTask;
import org.apache.samza.task.TaskContext;
import org.apache.samza.task.TaskCoordinator;
import org.apache.samza.task.WindowableTask;
public class Watcher implements StreamTask, WindowableTask, InitableTask {
private boolean inError = false;
private long lastEpochChange = System.currentTimeMillis();
private long maxTimeBetweenEpochsMs;
private int currentEpoch = 0;
private String smtpHost;
private String to;
private String from;
@Override
public void init(Config config, TaskContext context) {
this.maxTimeBetweenEpochsMs = config.getLong("max.time.between.epochs.ms");
this.smtpHost = config.get("mail.smtp.host");
this.to = config.get("mail.to");
this.from = config.get("mail.from");
}
@Override
public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) {
int epoch = Integer.parseInt((String) envelope.getMessage());
if(epoch > currentEpoch) {
this.currentEpoch = epoch;
this.lastEpochChange = System.currentTimeMillis();
this.inError = false;
}
}
@Override
public void window(MessageCollector collector, TaskCoordinator coordinator) {
boolean isLagging = System.currentTimeMillis() - lastEpochChange > maxTimeBetweenEpochsMs;
if(!inError && isLagging) {
this.inError = true;
sendEmail(from, to, "Job failed to make progress!", String.format("No epoch change for %d minutes.", this.maxTimeBetweenEpochsMs / (60*1000)));
}
}
private void sendEmail(String from, String to, String subject, String body) {
Properties props = new Properties();
props.put("mail.smtp.host", smtpHost);
Session session = Session.getInstance(props, null);
try {
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
msg.addRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(body);
Transport.send(msg);
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}