Java tutorial
/** * 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 com.alibaba.jstorm.daemon.nimbus; import backtype.storm.utils.Utils; import com.alibaba.jstorm.cache.JStormCache; import com.alibaba.jstorm.cache.RocksDBCache; import com.alibaba.jstorm.cache.TimeoutMemCache; import com.alibaba.jstorm.client.ConfigExtension; import com.alibaba.jstorm.cluster.StormClusterState; import com.alibaba.jstorm.cluster.StormConfig; import com.alibaba.jstorm.utils.OSInfo; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.Map; public class NimbusCache { private static final Logger LOG = LoggerFactory.getLogger(NimbusCache.class); public static final String TIMEOUT_MEM_CACHE_CLASS = TimeoutMemCache.class.getName(); public static final String ROCKS_DB_CACHE_CLASS = RocksDBCache.class.getName(); protected JStormCache memCache; protected JStormCache dbCache; protected StormClusterState zkCluster; public String getNimbusCacheClass(Map conf) { boolean isLinux = OSInfo.isLinux(); boolean isMac = OSInfo.isMac(); boolean isLocal = StormConfig.local_mode(conf); if (isLocal == true) { return TIMEOUT_MEM_CACHE_CLASS; } if (isLinux == false && isMac == false) { return TIMEOUT_MEM_CACHE_CLASS; } String nimbusCacheClass = ConfigExtension.getNimbusCacheClass(conf); if (StringUtils.isBlank(nimbusCacheClass) == false) { return nimbusCacheClass; } return ROCKS_DB_CACHE_CLASS; } public NimbusCache(Map conf, StormClusterState zkCluster) { super(); String dbCacheClass = getNimbusCacheClass(conf); LOG.info("NimbusCache db Cache will use {}", dbCacheClass); try { dbCache = (JStormCache) Utils.newInstance(dbCacheClass); String dbDir = StormConfig.masterDbDir(conf); conf.put(RocksDBCache.ROCKSDB_ROOT_DIR, dbDir); conf.put(RocksDBCache.ROCKSDB_RESET, ConfigExtension.getNimbusCacheReset(conf)); dbCache.init(conf); if (dbCache instanceof TimeoutMemCache) { memCache = dbCache; } else { memCache = new TimeoutMemCache(); memCache.init(conf); } } catch (UnsupportedClassVersionError e) { if (e.getMessage().indexOf("Unsupported major.minor version") >= 0) { LOG.error("!!!Please update jdk version to 7 or higher!!!"); } LOG.error("Failed to create NimbusCache!", e); throw new RuntimeException(e); } catch (Exception e) { LOG.error("Failed to create NimbusCache!", e); throw new RuntimeException(e); } this.zkCluster = zkCluster; } public JStormCache getMemCache() { return memCache; } public JStormCache getDbCache() { return dbCache; } public void cleanup() { dbCache.cleanup(); } /** * * In the old design, DBCache will cache all taskInfo/taskErrors, this will be useful for huge topology * * But the latest zk design, taskInfo is only one znode, taskErros has few znode So remove them from DBCache Skip timely refresh taskInfo/taskErrors * */ }