| /* |
| * 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.fluo.core.impl; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.Weigher; |
| import org.apache.fluo.api.config.FluoConfiguration; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| |
| public class TxInfoCache { |
| |
| static final int CACHE_TIMEOUT_MIN = 24 * 60; |
| |
| private static class TxStatusWeigher implements Weigher<PrimaryRowColumn, TxInfo> { |
| @Override |
| public int weigh(PrimaryRowColumn key, TxInfo value) { |
| return key.weight() + (value.lockValue == null ? 0 : value.lockValue.length) + 24; |
| } |
| } |
| |
| private final Cache<PrimaryRowColumn, TxInfo> cache; |
| private final Environment env; |
| |
| TxInfoCache(Environment env) { |
| final FluoConfiguration conf = env.getConfiguration(); |
| cache = CacheBuilder.newBuilder() |
| .expireAfterAccess(FluoConfigurationImpl.getTxIfoCacheTimeout(conf, TimeUnit.MILLISECONDS), |
| TimeUnit.MILLISECONDS) |
| .maximumWeight(FluoConfigurationImpl.getTxInfoCacheSize(conf)) |
| .weigher(new TxStatusWeigher()).concurrencyLevel(10).build(); |
| this.env = env; |
| } |
| |
| public TxInfo getTransactionInfo(final Bytes prow, final Column pcol, final long startTs) { |
| return getTransactionInfo(new PrimaryRowColumn(prow, pcol, startTs)); |
| } |
| |
| public TxInfo getTransactionInfo(PrimaryRowColumn key) { |
| |
| TxInfo txInfo = cache.getIfPresent(key); |
| if (txInfo == null) { |
| txInfo = TxInfo.getTransactionInfo(env, key.prow, key.pcol, key.startTs); |
| if (txInfo.status == TxStatus.ROLLED_BACK || txInfo.status == TxStatus.COMMITTED) { |
| // only cache for these statuses which are not expected to change, other status can change |
| // over time |
| cache.put(key, txInfo); |
| } |
| } |
| return txInfo; |
| } |
| } |