Java tutorial
/* * Copyright 2010-2011 the original author or authors. * * 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 com.googlecode.starflow.core.key; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.transaction.support.TransactionTemplate; /** * * @author libinsong1204@gmail.com * @version 1.0 */ public class SequenceFactory implements ApplicationContextAware { private static Map<String, SingleSequence> singleSequenceMap = new ConcurrentHashMap<String, SingleSequence>(); private static SequenceFactory factory; private TransactionTemplate transactionTemplate; private UniqueTableApp uniqueTableApp; private ApplicationContext context; private int cacheKeyNum = 10; private SequenceFactory() { } public static SingleSequence getSequence(String name) { SingleSequence sequence = (SingleSequence) singleSequenceMap.get(name); if (sequence == null) { synchronized (SequenceFactory.class) { if (sequence == null) { sequence = factory.createSequence(name); singleSequenceMap.put(name, sequence); } } } return sequence; } private SingleSequence createSequence(String name) { int cacheNum = getCacheKeyNum(); SingleSequence sequence = new SingleSequence(cacheNum, uniqueTableApp, transactionTemplate); return sequence; } public void setUniqueTableApp(UniqueTableApp uniqueTableApp) { this.uniqueTableApp = uniqueTableApp; } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.context = applicationContext; factory = this.context.getBean(SequenceFactory.class); } public int getCacheKeyNum() { return cacheKeyNum; } public void setCacheKeyNum(int cacheKeyNum) { this.cacheKeyNum = cacheKeyNum; } public TransactionTemplate getTransactionTemplate() { return transactionTemplate; } public void setTransactionTemplate(TransactionTemplate transactionTemplate) { this.transactionTemplate = transactionTemplate; } }