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/*
* Tencent is pleased to support the open source community by making Polaris available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
*
* Licensed under the BSD 3-Clause License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*
* 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.tencent.polaris.plugins.registry.memory;
import com.google.protobuf.Message;
import com.tencent.polaris.api.exception.ErrorCode;
import com.tencent.polaris.api.exception.PolarisException;
import com.tencent.polaris.api.plugin.registry.CacheHandler;
import com.tencent.polaris.api.plugin.registry.CacheHandler.CachedStatus;
import com.tencent.polaris.api.plugin.registry.EventCompleteNotifier;
import com.tencent.polaris.api.plugin.registry.ResourceEventListener;
import com.tencent.polaris.api.plugin.server.EventHandler;
import com.tencent.polaris.api.plugin.server.ServerEvent;
import com.tencent.polaris.api.pojo.RegistryCacheValue;
import com.tencent.polaris.api.pojo.ServiceEventKey;
import com.tencent.polaris.api.pojo.ServiceEventKey.EventType;
import com.tencent.polaris.api.utils.CollectionUtils;
import com.tencent.polaris.client.pojo.ServiceInstancesByProto;
import com.tencent.polaris.client.pojo.ServiceRuleByProto;
import com.tencent.polaris.client.pojo.ServicesByProto;
import com.tencent.polaris.logging.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
import org.slf4j.Logger;
/**
* 服务缓存的封装类型
*
* @author andrewshan
* @date 2019/8/22
*/
public class CacheObject implements EventHandler {
private static final Logger LOG = LoggerFactory.getLogger(CacheObject.class);
private final AtomicReference value = new AtomicReference<>();
private final AtomicReference originRevision = new AtomicReference<>();
private final ServiceEventKey svcEventKey;
private final CacheHandler cacheHandler;
private final InMemoryRegistry registry;
//用于守护notifier的变更
private final Object lock = new Object();
private final List notifiers = new ArrayList<>();
private final AtomicLong lastAccessTimeMs = new AtomicLong(0);
private final long createTime;
//是否经过远程更新
private final AtomicBoolean remoteUpdated = new AtomicBoolean(false);
//是否已经注册了connector监听
private final AtomicBoolean registered = new AtomicBoolean(false);
//这个服务对象是否已经被删除，防止connector收到多次服务不存在的消息，导致重复删除
private final AtomicBoolean deleted = new AtomicBoolean(false);
//是否已经触发了资源新增回调
private final AtomicBoolean notifyResourceAdded = new AtomicBoolean(false);
//是否被 Watch
private final AtomicBoolean watched = new AtomicBoolean(false);
public CacheObject(CacheHandler cacheHandler, ServiceEventKey svcEventKey, InMemoryRegistry registry) {
this.svcEventKey = svcEventKey;
this.registry = registry;
this.cacheHandler = cacheHandler;
long nowMs = System.currentTimeMillis();
createTime = nowMs;
setLastAccessTimeMs(nowMs);
}
public CacheObject(CacheHandler cacheHandler, ServiceEventKey svcEventKey, InMemoryRegistry registry,
Message initValue) {
this.svcEventKey = svcEventKey;
this.registry = registry;
this.cacheHandler = cacheHandler;
long nowMs = System.currentTimeMillis();
createTime = nowMs;
setLastAccessTimeMs(nowMs);
RegistryCacheValue registryCacheValue = cacheHandler.messageToCacheValue(null, initValue, true);
value.set(registryCacheValue);
}
/**
* 创建时间
*
* @return long
*/
public long getCreateTime() {
return createTime;
}
/**
* 返回是否已经经过了远程更新
*
* @return remoteUpdated
*/
public boolean isRemoteUpdated() {
return remoteUpdated.get();
}
/**
* 通知并清理所有的监听器
*
* @param error 异常
*/
private void notifyEvent(Throwable error) {
if (CollectionUtils.isEmpty(notifiers)) {
return;
}
notifiers.forEach(notifier -> {
if (null != error) {
notifier.completeExceptionally(svcEventKey, error);
} else {
notifier.complete(svcEventKey);
}
});
notifiers.clear();
}
/**
* 增加监听器
*
* @param notifier 实例事件监听器
*/
public void addNotifier(EventCompleteNotifier notifier) {
if (checkNotifyNow(notifier)) {
return;
}
synchronized (lock) {
if (checkNotifyNow(notifier)) {
return;
}
notifiers.add(notifier);
}
}
/**
* 加载缓存值
*
* @param updateVisitTime 是否更新访问时间
* @return 值对象
*/
public RegistryCacheValue loadValue(boolean updateVisitTime) {
if (updateVisitTime) {
lastAccessTimeMs.set(System.currentTimeMillis());
}
RegistryCacheValue registryCacheValue = value.get();
if (null == registryCacheValue) {
return null;
}
if (notifyResourceAdded.compareAndSet(false, true)) {
Collection resourceEventListeners = registry.getResourceEventListeners();
if (!CollectionUtils.isEmpty(resourceEventListeners)) {
for (ResourceEventListener listener : resourceEventListeners) {
listener.onResourceAdd(svcEventKey, registryCacheValue);
}
}
}
return registryCacheValue;
}
@Override
public boolean onEventUpdate(ServerEvent event) {
ServiceEventKey serviceEventKey = event.getServiceEventKey();
PolarisException error = event.getError();
remoteUpdated.set(true);
boolean svcDeleted = false;
Collection resourceEventListeners = registry.getResourceEventListeners();
if (null != error) {
//收取消息有出错
RegistryCacheValue registryCacheValue = loadValue(false);
//没有服务信息直接删除
if (error.getCode() == ErrorCode.SERVICE_NOT_FOUND) {
if (deleted.compareAndSet(false, true)) {
registry.removeCache(serviceEventKey);
for (ResourceEventListener listener : resourceEventListeners) {
listener.onResourceDeleted(svcEventKey, registryCacheValue);
}
svcDeleted = true;
}
} else {
LOG.error(String.format("received error notify for service %s", serviceEventKey), error);
}
} else {
Object message = event.getValue();
RegistryCacheValue cachedValue = value.get();
CachedStatus cachedStatus = cacheHandler.compareMessage(cachedValue, message);
if (cachedStatus == CachedStatus.CacheChanged || cachedStatus == CachedStatus.CacheNotExists) {
LOG.info("OnServiceUpdate: cache {} is pending to update", svcEventKey);
this.registry.saveMessageToFile(serviceEventKey, (Message) message);
RegistryCacheValue newCachedValue = cacheHandler.messageToCacheValue(cachedValue, message, false);
if (setValue(newCachedValue, event.getPolarisRevision()) && cachedStatus == CachedStatus.CacheChanged) {
for (ResourceEventListener listener : resourceEventListeners) {
listener.onResourceUpdated(svcEventKey, cachedValue, newCachedValue);
}
}
} else if (cachedStatus == CachedStatus.CacheEmptyButNoData) {
LOG.error("OnServiceUpdate: {} is empty, but discover returns no data", svcEventKey);
}
boolean newRemoteCache = null == cachedValue || cachedValue.isLoadedFromFile();
if (newRemoteCache && serviceEventKey.getEventType() == EventType.INSTANCE) {
//设置就绪状态
registry.setServerServiceReady(serviceEventKey);
}
}
synchronized (lock) {
if (error != null && ErrorCode.SERVICE_NOT_FOUND.equals(error.getCode())) {
notifyEvent(null);
}
notifyEvent(error);
}
return svcDeleted;
}
private boolean setValue(RegistryCacheValue registryCacheValue, Optional revision) {
if (revision.isPresent()) {
originRevision.set(revision.get());
LOG.info("CacheObject: value for {} is updated, revision {}, originRevision: {}",
svcEventKey, registryCacheValue.getRevision(), revision.get());
}
value.set(registryCacheValue);
LOG.info("CacheObject: value for {} is updated, revision {}", svcEventKey, revision.isPresent() ?
originRevision : registryCacheValue.getRevision());
return true;
}
//发起注册，只要一个能够发起成功
boolean startRegister() {
synchronized (lock) {
return registered.compareAndSet(false, true);
}
}
//恢复未注册状态
void resumeUnRegistered(PolarisException e) {
synchronized (lock) {
registered.compareAndSet(true, false);
notifyEvent(e);
}
}
private boolean checkResourceAvailable() {
RegistryCacheValue registryCacheValue = value.get();
if (null == registryCacheValue) {
return false;
}
return registryCacheValue.isInitialized() && !registryCacheValue.isLoadedFromFile();
}
private boolean checkNotifyNow(EventCompleteNotifier notifier) {
if (checkResourceAvailable()) {
notifier.complete(svcEventKey);
return true;
}
return false;
}
/**
* 获取最近一次的访问时间
*
* @return long
*/
public long getLastAccessTimeMs() {
return lastAccessTimeMs.get();
}
/**
* 设置最近一次的访问时间
*
* @param value 访问时间值，单位毫秒
*/
public void setLastAccessTimeMs(long value) {
lastAccessTimeMs.set(value);
}
/**
* 获取资源标识
*
* @return 资源标识
*/
public ServiceEventKey getServiceEventKey() {
return svcEventKey;
}
@Override
public String getRevision() {
String revision = originRevision.get();
if (revision != null) {
return revision;
}
RegistryCacheValue registryCacheValue = getValue();
if (null == registryCacheValue) {
return "";
}
return registryCacheValue.getRevision();
}
@Override
public RegistryCacheValue getValue() {
return value.get();
}
public boolean isWatched() {
return watched.get();
}
public void openWatch() {
watched.set(true);
}
public void cancelWatch() {
watched.set(false);
}
}
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