FirehoseMessageProcessor.java
/*
* Copyright 2021 Global Crop Diversity Trust
*
* Licensed 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.gringlobal.component.firehose;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.NavigableSet;
import javax.annotation.Resource;
import lombok.extern.slf4j.Slf4j;
import org.gringlobal.component.firehose.FirehoseEvent.EventType;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
/**
*
* Inspects the insert/update/delete queues and issues notifications.
*
* @author Artem Hrybeniuk
*/
@Component("firehoseMessageProcessor")
@Slf4j
public class FirehoseMessageProcessor {
@Value("${firehose.delay:10}")
private int firehoseDelay;
@Resource(name = "updatedEventSet")
private NavigableSet<FirehoseEvent> updatedEvents;
@Resource(name = "removedEventSet")
private NavigableSet<FirehoseEvent> removedEvents;
@Resource(name = "createdEventSet")
private NavigableSet<FirehoseEvent> createdEvents;
@Scheduled(fixedDelay = 1000)
public void processQueues() {
// Date stopDate = new Date(System.currentTimeMillis() - (firehoseDelay * 1000 * 60)); // delay in minutes
Date stopDate = new Date(System.currentTimeMillis() - (firehoseDelay * 1000)); // delay in seconds
log.trace("Scanning repository changes objects before: {}", stopDate);
List<FirehoseEvent> removedEventsForSending = getEventsBeforeStopDate(removedEvents, stopDate);
List<FirehoseEvent> createdEventsForSending = getEventsBeforeStopDate(createdEvents, stopDate);
List<FirehoseEvent> updatedEventsForSending = getEventsBeforeStopDate(updatedEvents, stopDate);
processEvents(FirehoseEvent.EventType.DELETE, removedEventsForSending);
processEvents(FirehoseEvent.EventType.CREATE, createdEventsForSending);
processEvents(FirehoseEvent.EventType.UPDATE, updatedEventsForSending);
}
private void processEvents(EventType eventType, List<FirehoseEvent> events) {
if (events == null) {
return;
}
events.forEach(firehoseEvent -> {
if (eventType == FirehoseEvent.EventType.CREATE) {
log.info("Sending CREATE notification for {} id={} @ {}", firehoseEvent.getClazz(), firehoseEvent.getId(), firehoseEvent.getTimestamp());
} else if (eventType == FirehoseEvent.EventType.UPDATE) {
log.info("Sending UPDATE notification for {} id={} @ {}", firehoseEvent.getClazz(), firehoseEvent.getId(), firehoseEvent.getTimestamp());
} else if (eventType == FirehoseEvent.EventType.DELETE) {
log.info("Sending DELETE notification for {} id={} @ {}", firehoseEvent.getClazz(), firehoseEvent.getId(), firehoseEvent.getTimestamp());
}
});
}
private List<FirehoseEvent> getEventsBeforeStopDate(NavigableSet<FirehoseEvent> events, Date stopDate) {
if (events.isEmpty()) {
return null;
}
var eventsBeforeStopDate = events.headSet(new FirehoseEvent(null, null, stopDate, null));
if (eventsBeforeStopDate.size() == 0) {
return null;
}
log.debug("Matched {} of {} events", eventsBeforeStopDate.size(), events.size());
var eventsForSending = new ArrayList<>(eventsBeforeStopDate);
eventsBeforeStopDate.clear();
log.debug("Keeping {} events, remaining {} of {} events", eventsForSending.size(), eventsBeforeStopDate.size(), events.size());
return eventsForSending;
}
}