cn.edu.ahpu.common.dao.key.SequenceFactory.java Source code

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Here is the source code for cn.edu.ahpu.common.dao.key.SequenceFactory.java

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/*
? * 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 cn.edu.ahpu.common.dao.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;
    }
}