com.gzj.tulip.jade.dataaccess.datasource.MasterSlaveDataSourceFactory.java Source code

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Here is the source code for com.gzj.tulip.jade.dataaccess.datasource.MasterSlaveDataSourceFactory.java

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/*
 * Copyright 2009-2012 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 i 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.gzj.tulip.jade.dataaccess.datasource;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import com.gzj.tulip.jade.dataaccess.DataSourceHolder;
import com.gzj.tulip.jade.annotation.SQLType;
import com.gzj.tulip.jade.dataaccess.DataSourceFactory;
import com.gzj.tulip.jade.statement.StatementMetaData;

import org.springframework.util.CollectionUtils;

/**
 * master-slave?????master?slave
 * <p>
 * 
 * Java?Spring?????)
 * 
 * <pre>
 * MasterSlaveDataSourceFactory mainFactory = new MasterSlaveDataSourceFactory();
 * 
 * DataSource master = getMasterDataSource();
 * mainFactory.setMasters(new SimpleDataSourceFactory(master));
 * 
 * List&lt;DataSource&gt; slaves = getSlaveDataSources();
 * if (queryFromMaster) {
 *     slaves = new ArrayList&lt;DataSource&gt;(slaves);
 *     slaves.add(master);
 * }
 * mainFactory.setSlaves(new RandomDataSourceFactory(slaves));
 * </pre>
 * 
 * @author  [qieqie.wang@gmail.com]
 * 
 */
public class MasterSlaveDataSourceFactory implements DataSourceFactory {

    private DataSourceFactory masters = new RandomDataSourceFactory();

    private DataSourceFactory slaves = new RandomDataSourceFactory();

    public MasterSlaveDataSourceFactory() {
    }

    /**
     * 
     * @param master
     * @param slaves
     * @param queryFromMaster true?master???
     */
    public MasterSlaveDataSourceFactory(DataSource master, List<DataSource> slaves, boolean queryFromMaster) {
        if (queryFromMaster && !CollectionUtils.containsInstance(slaves, master)) {
            slaves = new ArrayList<DataSource>(slaves);
            slaves.add(master);
        }
        setSlaves(new RandomDataSourceFactory(slaves));
        setMasters(new SimpleDataSourceFactory(master));
    }

    //------------------

    /**
     * 
     * @param masters
     * @see RandomDataSourceFactory
     * @see SimpleDataSourceFactory
     */
    public void setMasters(DataSourceFactory masters) {
        this.masters = masters;
    }

    /**
     * 
     * @param slaves
     * @see RandomDataSourceFactory
     */
    public void setSlaves(DataSourceFactory slaves) {
        this.slaves = slaves;
    }

    @Override
    public DataSourceHolder getHolder(StatementMetaData metaData, Map<String, Object> runtimeProperties) {
        if (metaData.getSQLType() != SQLType.READ) {
            return masters.getHolder(metaData, runtimeProperties);
        } else {
            return slaves.getHolder(metaData, runtimeProperties);
        }
    }
}