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ReleaseMessageScanner.java
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ReleaseMessageScanner.java
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/*
* Copyright 2024 Apollo Authors
*
* 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 com.ctrip.framework.apollo.biz.message;
import com.google.common.collect.Maps;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.CollectionUtils;
import com.ctrip.framework.apollo.biz.config.BizConfig;
import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
import com.ctrip.framework.apollo.biz.repository.ReleaseMessageRepository;
import com.ctrip.framework.apollo.core.utils.ApolloThreadFactory;
import com.ctrip.framework.apollo.tracer.Tracer;
import com.ctrip.framework.apollo.tracer.spi.Transaction;
import com.google.common.collect.Lists;
/**
* @author Jason Song(song_s@ctrip.com)
*/
public class ReleaseMessageScanner implements InitializingBean {
private static final Logger logger = LoggerFactory.getLogger(ReleaseMessageScanner.class);
private static final int missingReleaseMessageMaxAge = 10; // hardcoded to 10, could be configured via BizConfig if necessary
private final BizConfig bizConfig;
private final ReleaseMessageRepository releaseMessageRepository;
private int databaseScanInterval;
private final List<ReleaseMessageListener> listeners;
private final ScheduledExecutorService executorService;
private final Map<Long, Integer> missingReleaseMessages; // missing release message id => age counter
private long maxIdScanned;
public ReleaseMessageScanner(final BizConfig bizConfig,
final ReleaseMessageRepository releaseMessageRepository) {
this.bizConfig = bizConfig;
this.releaseMessageRepository = releaseMessageRepository;
listeners = Lists.newCopyOnWriteArrayList();
executorService = Executors.newScheduledThreadPool(1, ApolloThreadFactory
.create("ReleaseMessageScanner", true));
missingReleaseMessages = Maps.newHashMap();
}
@Override
public void afterPropertiesSet() throws Exception {
databaseScanInterval = bizConfig.releaseMessageScanIntervalInMilli();
maxIdScanned = loadLargestMessageId();
executorService.scheduleWithFixedDelay(() -> {
Transaction transaction = Tracer.newTransaction("Apollo.ReleaseMessageScanner", "scanMessage");
try {
scanMissingMessages();
scanMessages();
transaction.setStatus(Transaction.SUCCESS);
} catch (Throwable ex) {
transaction.setStatus(ex);
logger.error("Scan and send message failed", ex);
} finally {
transaction.complete();
}
}, databaseScanInterval, databaseScanInterval, TimeUnit.MILLISECONDS);
}
/**
* add message listeners for release message
* @param listener
*/
public void addMessageListener(ReleaseMessageListener listener) {
if (!listeners.contains(listener)) {
listeners.add(listener);
}
}
/**
* Scan messages, continue scanning until there is no more messages
*/
private void scanMessages() {
boolean hasMoreMessages = true;
while (hasMoreMessages && !Thread.currentThread().isInterrupted()) {
hasMoreMessages = scanAndSendMessages();
}
}
/**
* scan messages and send
*
* @return whether there are more messages
*/
private boolean scanAndSendMessages() {
//current batch is 500
List<ReleaseMessage> releaseMessages =
releaseMessageRepository.findFirst500ByIdGreaterThanOrderByIdAsc(maxIdScanned);
if (CollectionUtils.isEmpty(releaseMessages)) {
return false;
}
fireMessageScanned(releaseMessages);
int messageScanned = releaseMessages.size();
long newMaxIdScanned = releaseMessages.get(messageScanned - 1).getId();
// check id gaps, possible reasons are release message not committed yet or already rolled back
if (newMaxIdScanned - maxIdScanned > messageScanned) {
recordMissingReleaseMessageIds(releaseMessages, maxIdScanned);
}
maxIdScanned = newMaxIdScanned;
return messageScanned == 500;
}
private void scanMissingMessages() {
Set<Long> missingReleaseMessageIds = missingReleaseMessages.keySet();
Iterable<ReleaseMessage> releaseMessages = releaseMessageRepository
.findAllById(missingReleaseMessageIds);
fireMessageScanned(releaseMessages);
releaseMessages.forEach(releaseMessage -> {
missingReleaseMessageIds.remove(releaseMessage.getId());
});
growAndCleanMissingMessages();
}
private void growAndCleanMissingMessages() {
Iterator<Entry<Long, Integer>> iterator = missingReleaseMessages.entrySet()
.iterator();
while (iterator.hasNext()) {
Entry<Long, Integer> entry = iterator.next();
if (entry.getValue() > missingReleaseMessageMaxAge) {
iterator.remove();
} else {
entry.setValue(entry.getValue() + 1);
}
}
}
private void recordMissingReleaseMessageIds(List<ReleaseMessage> messages, long startId) {
for (ReleaseMessage message : messages) {
long currentId = message.getId();
if (currentId - startId > 1) {
for (long i = startId + 1; i < currentId; i++) {
missingReleaseMessages.putIfAbsent(i, 1);
}
}
startId = currentId;
}
}
/**
* find largest message id as the current start point
* @return current largest message id
*/
private long loadLargestMessageId() {
ReleaseMessage releaseMessage = releaseMessageRepository.findTopByOrderByIdDesc();
return releaseMessage == null ? 0 : releaseMessage.getId();
}
/**
* Notify listeners with messages loaded
* @param messages
*/
private void fireMessageScanned(Iterable<ReleaseMessage> messages) {
for (ReleaseMessage message : messages) {
for (ReleaseMessageListener listener : listeners) {
try {
listener.handleMessage(message, Topics.APOLLO_RELEASE_TOPIC);
} catch (Throwable ex) {
Tracer.logError(ex);
logger.error("Failed to invoke message listener {}", listener.getClass(), ex);
}
}
}
}
}