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NotificationControllerV2.java
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NotificationControllerV2.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.configservice.controller;
import com.ctrip.framework.apollo.biz.config.BizConfig;
import com.ctrip.framework.apollo.biz.entity.ReleaseMessage;
import com.ctrip.framework.apollo.biz.message.ReleaseMessageListener;
import com.ctrip.framework.apollo.biz.message.Topics;
import com.ctrip.framework.apollo.biz.utils.EntityManagerUtil;
import com.ctrip.framework.apollo.biz.utils.ReleaseMessageKeyGenerator;
import com.ctrip.framework.apollo.common.exception.BadRequestException;
import com.ctrip.framework.apollo.configservice.service.ReleaseMessageServiceWithCache;
import com.ctrip.framework.apollo.configservice.util.NamespaceUtil;
import com.ctrip.framework.apollo.configservice.util.WatchKeysUtil;
import com.ctrip.framework.apollo.configservice.wrapper.DeferredResultWrapper;
import com.ctrip.framework.apollo.core.ConfigConsts;
import com.ctrip.framework.apollo.core.dto.ApolloConfigNotification;
import com.ctrip.framework.apollo.core.utils.ApolloThreadFactory;
import com.ctrip.framework.apollo.tracer.Tracer;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import com.google.common.collect.TreeMultimap;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
/**
* @author Jason Song(song_s@ctrip.com)
*/
@RestController
@RequestMapping("/notifications/v2")
public class NotificationControllerV2 implements ReleaseMessageListener {
private static final Logger logger = LoggerFactory.getLogger(NotificationControllerV2.class);
private final Multimap<String, DeferredResultWrapper> deferredResults =
Multimaps.synchronizedSetMultimap(TreeMultimap.create(String.CASE_INSENSITIVE_ORDER, Ordering.natural()));
private static final Type notificationsTypeReference =
new TypeToken<List<ApolloConfigNotification>>() {
}.getType();
private final ExecutorService largeNotificationBatchExecutorService;
private final WatchKeysUtil watchKeysUtil;
private final ReleaseMessageServiceWithCache releaseMessageService;
private final EntityManagerUtil entityManagerUtil;
private final NamespaceUtil namespaceUtil;
private final Gson gson;
private final BizConfig bizConfig;
public NotificationControllerV2(
final WatchKeysUtil watchKeysUtil,
final ReleaseMessageServiceWithCache releaseMessageService,
final EntityManagerUtil entityManagerUtil,
final NamespaceUtil namespaceUtil,
final Gson gson,
final BizConfig bizConfig) {
largeNotificationBatchExecutorService = Executors.newSingleThreadExecutor(ApolloThreadFactory.create
("NotificationControllerV2", true));
this.watchKeysUtil = watchKeysUtil;
this.releaseMessageService = releaseMessageService;
this.entityManagerUtil = entityManagerUtil;
this.namespaceUtil = namespaceUtil;
this.gson = gson;
this.bizConfig = bizConfig;
}
@GetMapping
public DeferredResult<ResponseEntity<List<ApolloConfigNotification>>> pollNotification(
@RequestParam(value = "appId") String appId,
@RequestParam(value = "cluster") String cluster,
@RequestParam(value = "notifications") String notificationsAsString,
@RequestParam(value = "dataCenter", required = false) String dataCenter,
@RequestParam(value = "ip", required = false) String clientIp) {
List<ApolloConfigNotification> notifications = null;
try {
notifications =
gson.fromJson(notificationsAsString, notificationsTypeReference);
} catch (Throwable ex) {
Tracer.logError(ex);
}
if (CollectionUtils.isEmpty(notifications)) {
throw BadRequestException.invalidNotificationsFormat(notificationsAsString);
}
Map<String, ApolloConfigNotification> filteredNotifications = filterNotifications(appId, notifications);
if (CollectionUtils.isEmpty(filteredNotifications)) {
throw BadRequestException.invalidNotificationsFormat(notificationsAsString);
}
DeferredResultWrapper deferredResultWrapper = new DeferredResultWrapper(bizConfig.longPollingTimeoutInMilli());
Set<String> namespaces = Sets.newHashSetWithExpectedSize(filteredNotifications.size());
Map<String, Long> clientSideNotifications = Maps.newHashMapWithExpectedSize(filteredNotifications.size());
for (Map.Entry<String, ApolloConfigNotification> notificationEntry : filteredNotifications.entrySet()) {
String normalizedNamespace = notificationEntry.getKey();
ApolloConfigNotification notification = notificationEntry.getValue();
namespaces.add(normalizedNamespace);
clientSideNotifications.put(normalizedNamespace, notification.getNotificationId());
if (!Objects.equals(notification.getNamespaceName(), normalizedNamespace)) {
deferredResultWrapper.recordNamespaceNameNormalizedResult(notification.getNamespaceName(), normalizedNamespace);
}
}
Multimap<String, String> watchedKeysMap =
watchKeysUtil.assembleAllWatchKeys(appId, cluster, namespaces, dataCenter);
Set<String> watchedKeys = Sets.newHashSet(watchedKeysMap.values());
/**
* 1、set deferredResult before the check, for avoid more waiting
* If the check before setting deferredResult,it may receive a notification the next time
* when method handleMessage is executed between check and set deferredResult.
*/
deferredResultWrapper
.onTimeout(() -> logWatchedKeys(watchedKeys, "Apollo.LongPoll.TimeOutKeys"));
deferredResultWrapper.onCompletion(() -> {
//unregister all keys
for (String key : watchedKeys) {
deferredResults.remove(key, deferredResultWrapper);
}
logWatchedKeys(watchedKeys, "Apollo.LongPoll.CompletedKeys");
});
//register all keys
for (String key : watchedKeys) {
this.deferredResults.put(key, deferredResultWrapper);
}
logWatchedKeys(watchedKeys, "Apollo.LongPoll.RegisteredKeys");
logger.debug("Listening {} from appId: {}, cluster: {}, namespace: {}, datacenter: {}",
watchedKeys, appId, cluster, namespaces, dataCenter);
/**
* 2、check new release
*/
List<ReleaseMessage> latestReleaseMessages =
releaseMessageService.findLatestReleaseMessagesGroupByMessages(watchedKeys);
/**
* Manually close the entity manager.
* Since for async request, Spring won't do so until the request is finished,
* which is unacceptable since we are doing long polling - means the db connection would be hold
* for a very long time
*/
entityManagerUtil.closeEntityManager();
List<ApolloConfigNotification> newNotifications =
getApolloConfigNotifications(namespaces, clientSideNotifications, watchedKeysMap,
latestReleaseMessages);
if (!CollectionUtils.isEmpty(newNotifications)) {
deferredResultWrapper.setResult(newNotifications);
}
return deferredResultWrapper.getResult();
}
private Map<String, ApolloConfigNotification> filterNotifications(String appId,
List<ApolloConfigNotification> notifications) {
Map<String, ApolloConfigNotification> filteredNotifications = Maps.newHashMap();
for (ApolloConfigNotification notification : notifications) {
if (Strings.isNullOrEmpty(notification.getNamespaceName())) {
continue;
}
//strip out .properties suffix
String originalNamespace = namespaceUtil.filterNamespaceName(notification.getNamespaceName());
notification.setNamespaceName(originalNamespace);
//fix the character case issue, such as FX.apollo <-> fx.apollo
String normalizedNamespace = namespaceUtil.normalizeNamespace(appId, originalNamespace);
// in case client side namespace name has character case issue and has difference notification ids
// such as FX.apollo = 1 but fx.apollo = 2, we should let FX.apollo have the chance to update its notification id
// which means we should record FX.apollo = 1 here and ignore fx.apollo = 2
if (filteredNotifications.containsKey(normalizedNamespace) &&
filteredNotifications.get(normalizedNamespace).getNotificationId() < notification.getNotificationId()) {
continue;
}
filteredNotifications.put(normalizedNamespace, notification);
}
return filteredNotifications;
}
private List<ApolloConfigNotification> getApolloConfigNotifications(Set<String> namespaces,
Map<String, Long> clientSideNotifications,
Multimap<String, String> watchedKeysMap,
List<ReleaseMessage> latestReleaseMessages) {
List<ApolloConfigNotification> newNotifications = Lists.newArrayList();
if (!CollectionUtils.isEmpty(latestReleaseMessages)) {
Map<String, Long> latestNotifications = Maps.newHashMap();
for (ReleaseMessage releaseMessage : latestReleaseMessages) {
latestNotifications.put(releaseMessage.getMessage(), releaseMessage.getId());
}
for (String namespace : namespaces) {
long clientSideId = clientSideNotifications.get(namespace);
long latestId = ConfigConsts.NOTIFICATION_ID_PLACEHOLDER;
Collection<String> namespaceWatchedKeys = watchedKeysMap.get(namespace);
for (String namespaceWatchedKey : namespaceWatchedKeys) {
long namespaceNotificationId =
latestNotifications.getOrDefault(namespaceWatchedKey, ConfigConsts.NOTIFICATION_ID_PLACEHOLDER);
if (namespaceNotificationId > latestId) {
latestId = namespaceNotificationId;
}
}
if (latestId > clientSideId) {
ApolloConfigNotification notification = new ApolloConfigNotification(namespace, latestId);
namespaceWatchedKeys.stream().filter(latestNotifications::containsKey).forEach(namespaceWatchedKey ->
notification.addMessage(namespaceWatchedKey, latestNotifications.get(namespaceWatchedKey)));
newNotifications.add(notification);
}
}
}
return newNotifications;
}
@Override
public void handleMessage(ReleaseMessage message, String channel) {
logger.info("message received - channel: {}, message: {}", channel, message);
String content = message.getMessage();
Tracer.logEvent("Apollo.LongPoll.Messages", content);
if (!Topics.APOLLO_RELEASE_TOPIC.equals(channel) || Strings.isNullOrEmpty(content)) {
return;
}
String changedNamespace = retrieveNamespaceFromReleaseMessage.apply(content);
if (Strings.isNullOrEmpty(changedNamespace)) {
logger.error("message format invalid - {}", content);
return;
}
if (!deferredResults.containsKey(content)) {
return;
}
//create a new list to avoid ConcurrentModificationException
List<DeferredResultWrapper> results = Lists.newArrayList(deferredResults.get(content));
ApolloConfigNotification configNotification = new ApolloConfigNotification(changedNamespace, message.getId());
configNotification.addMessage(content, message.getId());
//do async notification if too many clients
if (results.size() > bizConfig.releaseMessageNotificationBatch()) {
largeNotificationBatchExecutorService.submit(() -> {
logger.debug("Async notify {} clients for key {} with batch {}", results.size(), content,
bizConfig.releaseMessageNotificationBatch());
for (int i = 0; i < results.size(); i++) {
if (i > 0 && i % bizConfig.releaseMessageNotificationBatch() == 0) {
try {
TimeUnit.MILLISECONDS.sleep(bizConfig.releaseMessageNotificationBatchIntervalInMilli());
} catch (InterruptedException e) {
//ignore
}
}
logger.debug("Async notify {}", results.get(i));
results.get(i).setResult(configNotification);
}
});
return;
}
logger.debug("Notify {} clients for key {}", results.size(), content);
for (DeferredResultWrapper result : results) {
result.setResult(configNotification);
}
logger.debug("Notification completed");
}
private static final Function<String, String> retrieveNamespaceFromReleaseMessage =
releaseMessage -> {
if (Strings.isNullOrEmpty(releaseMessage)) {
return null;
}
List<String> keys = ReleaseMessageKeyGenerator.messageToList(releaseMessage);
if (CollectionUtils.isEmpty(keys)) {
return null;
}
return keys.get(2);
};
private void logWatchedKeys(Set<String> watchedKeys, String eventName) {
for (String watchedKey : watchedKeys) {
Tracer.logEvent(eventName, watchedKey);
}
}
}