Java tutorial
/* * 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 org.esigate.cache; import java.util.Properties; import org.apache.http.impl.client.cache.CacheConfig; import org.esigate.ConfigurationException; import org.esigate.Parameters; public final class CacheConfigHelper { private CacheConfigHelper() { } public static CacheConfig createCacheConfig(Properties properties) { // Heuristic caching boolean heuristicCachingEnabled = Parameters.HEURISTIC_CACHING_ENABLED.getValue(properties); float heuristicCoefficient = Parameters.HEURISTIC_COEFFICIENT.getValue(properties); long heuristicDefaultLifetimeSecs = Parameters.HEURISTIC_DEFAULT_LIFETIME_SECS.getValue(properties); int maxCacheEntries = Parameters.MAX_CACHE_ENTRIES.getValue(properties); long maxObjectSize = Parameters.MAX_OBJECT_SIZE.getValue(properties); // Asynchronous revalidation int minAsynchronousWorkers = Parameters.MIN_ASYNCHRONOUS_WORKERS.getValue(properties); int maxAsynchronousWorkers = Parameters.MAX_ASYNCHRONOUS_WORKERS.getValue(properties); int asynchronousWorkerIdleLifetimeSecs = Parameters.ASYNCHRONOUS_WORKER_IDLE_LIFETIME_SECS .getValue(properties); int maxUpdateRetries = Parameters.MAX_UPDATE_RETRIES.getValue(properties); int revalidationQueueSize = Parameters.REVALIDATION_QUEUE_SIZE.getValue(properties); CacheConfig.Builder builder = CacheConfig.custom(); builder.setHeuristicCachingEnabled(heuristicCachingEnabled); builder.setHeuristicCoefficient(heuristicCoefficient); builder.setHeuristicDefaultLifetime(heuristicDefaultLifetimeSecs); builder.setMaxCacheEntries(maxCacheEntries); long usedMaxObjectSize = Long.MAX_VALUE; if (maxObjectSize > 0) { usedMaxObjectSize = maxObjectSize; } builder.setMaxObjectSize(usedMaxObjectSize); builder.setAsynchronousWorkersCore(minAsynchronousWorkers); builder.setAsynchronousWorkersMax(maxAsynchronousWorkers); builder.setAsynchronousWorkerIdleLifetimeSecs(asynchronousWorkerIdleLifetimeSecs); builder.setMaxUpdateRetries(maxUpdateRetries).setRevalidationQueueSize(revalidationQueueSize); builder.setSharedCache(true); return builder.build(); } public static CacheStorage createCacheStorage(Properties properties) { String cacheStorageClass = Parameters.CACHE_STORAGE.getValue(properties); Object cacheStorageObject; try { cacheStorageObject = Class.forName(cacheStorageClass).newInstance(); } catch (Exception e) { throw new ConfigurationException("Could not instantiate cacheStorageClass", e); } if (!(cacheStorageObject instanceof CacheStorage)) { throw new ConfigurationException("Cache storage class must extend org.esigate.cache.CacheStorage."); } CacheStorage cacheStorage = (CacheStorage) cacheStorageObject; cacheStorage.init(properties); return cacheStorage; } }