| /* |
| * 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.cassandra.auth; |
| |
| import java.util.Set; |
| import java.util.function.BiPredicate; |
| import java.util.function.BooleanSupplier; |
| |
| import com.github.benmanes.caffeine.cache.LoadingCache; |
| import com.google.common.annotations.VisibleForTesting; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.service.StorageService; |
| |
| public class CacheRefresher<K, V> implements Runnable |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CacheRefresher.class); |
| |
| private final String name; |
| private final LoadingCache<K, V> cache; |
| private final BiPredicate<K, V> invalidationCondition; |
| private final BooleanSupplier skipCondition; |
| |
| private CacheRefresher(String name, LoadingCache<K, V> cache, BiPredicate<K, V> invalidationCondition, BooleanSupplier skipCondition) |
| { |
| this.name = name; |
| this.cache = cache; |
| this.invalidationCondition = invalidationCondition; |
| this.skipCondition = skipCondition; |
| } |
| |
| public void run() |
| { |
| if (skipCondition.getAsBoolean()) |
| { |
| logger.debug("Skipping {} cache refresh", name); |
| return; |
| } |
| |
| try |
| { |
| logger.debug("Refreshing {} cache", name); |
| Set<K> ks = cache.asMap().keySet(); |
| for (K key : ks) |
| { |
| cache.refresh(key); |
| V value = cache.getIfPresent(key); |
| if (invalidationCondition.test(key, value)) |
| { |
| logger.debug("Invalidating key"); |
| cache.invalidate(key); |
| } |
| } |
| } |
| catch (Exception e) |
| { |
| logger.error("Unexpected exception refreshing {} cache", name, e); |
| } |
| } |
| |
| @VisibleForTesting |
| public static <K, V> CacheRefresher<K, V> create(String name, |
| LoadingCache<K, V> cache, |
| BiPredicate<K, V> invalidationCondition, |
| BooleanSupplier skipCondition) |
| { |
| logger.info("Creating CacheRefresher for {}", name); |
| return new CacheRefresher<>(name, cache, invalidationCondition, skipCondition); |
| } |
| |
| public static <K, V> CacheRefresher<K, V> create(String name, LoadingCache<K, V> cache, BiPredicate<K, V> invalidationCondition) |
| { |
| // By default we skip cache refreshes if the node has been decommed |
| return create(name, cache, invalidationCondition, StorageService.instance::isDecommissioned); |
| } |
| } |