| /* |
| * 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.servicecomb.serviceregistry.registry.cache; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.concurrent.locks.ReentrantLock; |
| import java.util.function.Consumer; |
| import java.util.stream.Collectors; |
| |
| import org.apache.servicecomb.foundation.common.concurrent.ConcurrentHashMapEx; |
| import org.apache.servicecomb.registry.api.event.MicroserviceInstanceChangedEvent; |
| import org.apache.servicecomb.registry.api.registry.Microservice; |
| import org.apache.servicecomb.serviceregistry.client.ServiceRegistryClient; |
| import org.apache.servicecomb.serviceregistry.registry.cache.MicroserviceCache.MicroserviceCacheStatus; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Cache the pulled microservice instances. |
| */ |
| public class RefreshableServiceRegistryCache implements ServiceRegistryCache { |
| private static final Logger LOGGER = LoggerFactory.getLogger(RefreshableServiceRegistryCache.class); |
| |
| Map<MicroserviceCacheKey, RefreshableMicroserviceCache> microserviceCache = new ConcurrentHashMapEx<>(); |
| |
| Microservice consumerService; |
| |
| ServiceRegistryClient srClient; |
| |
| boolean emptyInstanceProtectionEnabled = false; |
| |
| Consumer<List<MicroserviceCache>> cacheRefreshedWatcher; |
| |
| ReentrantLock refreshLock = new ReentrantLock(); |
| |
| public RefreshableServiceRegistryCache(Microservice consumerService, ServiceRegistryClient srClient) { |
| this.consumerService = consumerService; |
| this.srClient = srClient; |
| } |
| |
| public void refreshCache() { |
| if (!refreshLock.tryLock()) { |
| LOGGER.info("ignore concurrent refresh request"); |
| return; |
| } |
| |
| try { |
| List<MicroserviceCache> refreshedCaches = refreshInnerState(); |
| notifyWatcher(refreshedCaches); |
| } catch (Exception e) { |
| LOGGER.error("failed to refresh caches", e); |
| } finally { |
| refreshLock.unlock(); |
| } |
| } |
| |
| private List<MicroserviceCache> refreshInnerState() { |
| return microserviceCache.values().stream() |
| .peek(RefreshableMicroserviceCache::refresh) |
| .filter(this::isRefreshedMicroserviceCache) |
| .peek(this::removeCacheIfServiceNotFound) |
| .collect(Collectors.toList()); |
| } |
| |
| private boolean isRefreshedMicroserviceCache(MicroserviceCache microserviceCache) { |
| return MicroserviceCacheStatus.REFRESHED.equals(microserviceCache.getStatus()) |
| || MicroserviceCacheStatus.SERVICE_NOT_FOUND.equals(microserviceCache.getStatus()); |
| } |
| |
| private void notifyWatcher(List<MicroserviceCache> refreshedCaches) { |
| if (refreshedCaches.isEmpty() || null == cacheRefreshedWatcher) { |
| return; |
| } |
| cacheRefreshedWatcher.accept(refreshedCaches); |
| } |
| |
| @Override |
| public MicroserviceCache findServiceCache(MicroserviceCacheKey microserviceCacheKey) { |
| microserviceCacheKey.validate(); |
| RefreshableMicroserviceCache targetCache = microserviceCache |
| .computeIfAbsent(microserviceCacheKey, pk -> { |
| RefreshableMicroserviceCache microserviceCache = createMicroserviceCache(microserviceCacheKey); |
| microserviceCache.refresh(); |
| return microserviceCache; |
| }); |
| removeCacheIfServiceNotFound(targetCache); |
| return targetCache; |
| } |
| |
| private void removeCacheIfServiceNotFound(MicroserviceCache targetCache) { |
| if (MicroserviceCacheStatus.SERVICE_NOT_FOUND.equals(targetCache.getStatus())) { |
| microserviceCache.remove(targetCache.getKey()); |
| LOGGER.info("microserviceCache[{}] got removed", targetCache.getKey()); |
| } |
| } |
| |
| RefreshableMicroserviceCache createMicroserviceCache(MicroserviceCacheKey microserviceCacheKey) { |
| return new RefreshableMicroserviceCache( |
| consumerService, |
| microserviceCacheKey, |
| srClient, |
| emptyInstanceProtectionEnabled); |
| } |
| |
| public RefreshableServiceRegistryCache setEmptyInstanceProtectionEnabled(boolean emptyInstanceProtectionEnabled) { |
| this.emptyInstanceProtectionEnabled = emptyInstanceProtectionEnabled; |
| return this; |
| } |
| |
| @Override |
| public ServiceRegistryCache setCacheRefreshedWatcher( |
| Consumer<List<MicroserviceCache>> cacheRefreshedWatcher) { |
| this.cacheRefreshedWatcher = cacheRefreshedWatcher; |
| return this; |
| } |
| |
| public void onMicroserviceInstanceChanged(MicroserviceInstanceChangedEvent event) { |
| List<MicroserviceCache> refreshedCaches = |
| microserviceCache.entrySet().stream() |
| .peek(cacheEntry -> cacheEntry.getValue().onMicroserviceInstanceChanged(event)) |
| .filter(cacheEntry -> isRefreshedMicroserviceCache(cacheEntry.getValue())) |
| .map(Entry::getValue) |
| .collect(Collectors.toList()); |
| |
| notifyWatcher(refreshedCaches); |
| } |
| |
| @Override |
| public Map<MicroserviceCacheKey, MicroserviceCache> getMicroserviceCaches() { |
| return Collections.unmodifiableMap(microserviceCache); |
| } |
| } |