C3p0DSFactory.java

package com.xiaoleilu.hutool.db.ds.c3p0;

import java.util.Collection;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.xiaoleilu.hutool.db.DbRuntimeException;
import com.xiaoleilu.hutool.db.DbUtil;
import com.xiaoleilu.hutool.db.ds.DSFactory;
import com.xiaoleilu.hutool.setting.Setting;
import com.xiaoleilu.hutool.util.CollectionUtil;
import com.xiaoleilu.hutool.util.StrUtil;

/**
 * Druid数据源工厂类
 * @author Looly
 *
 */
public class C3p0DSFactory extends DSFactory {
	
	public static final String DS_NAME = "C3P0";
	
	/** 数据源池 */
	private Map<String, ComboPooledDataSource> dsMap;
	
	public C3p0DSFactory() {
		this(null);
	}
	
	public C3p0DSFactory(Setting setting) {
		super(DS_NAME, setting);
		checkCPExist(ComboPooledDataSource.class);
		this.dsMap = new ConcurrentHashMap<>();
	}

	@Override
	synchronized public DataSource getDataSource(String group) {
		if (group == null) {
			group = StrUtil.EMPTY;
		}
		
		// 如果已经存在已有数据源（连接池）直接返回
		final ComboPooledDataSource existedDataSource = dsMap.get(group);
		if (existedDataSource != null) {
			return existedDataSource;
		}

		ComboPooledDataSource ds = createDataSource(group);
		// 添加到数据源池中，以备下次使用
		dsMap.put(group, ds);
		return ds;
	}

	@Override
	public void close(String group) {
		if (group == null) {
			group = StrUtil.EMPTY;
		}

		ComboPooledDataSource ds = dsMap.get(group);
		if (ds != null) {
			ds.close();
			dsMap.remove(group);
		}
	}

	@Override
	public void destroy() {
		if(CollectionUtil.isNotEmpty(dsMap)){
			Collection<ComboPooledDataSource> values = dsMap.values();
			for (ComboPooledDataSource ds : values) {
				ds.close();
			}
			dsMap.clear();
		}
	}

	/**
	 * 创建数据源
	 * @param group 分组
	 * @return C3P0数据源 {@link ComboPooledDataSource}
	 */
	private ComboPooledDataSource createDataSource(String group){
		final Setting config = setting.getSetting(group);
		if(CollectionUtil.isEmpty(config)){
			throw new DbRuntimeException("No C3P0 config for group: [{}]", group);
		}
		
		final ComboPooledDataSource ds = new ComboPooledDataSource();
		
		//基本信息
		ds.setJdbcUrl(getAndRemoveProperty(config, "url", "jdbcUrl"));
		ds.setUser(getAndRemoveProperty(config, "username", "user"));
		ds.setPassword(getAndRemoveProperty(config, "password", "pass"));
		final String driver = getAndRemoveProperty(config, "driver", "driverClassName");
		try {
			if(StrUtil.isNotBlank(driver)){
				ds.setDriverClass(driver);
			}else{
				ds.setDriverClass(DbUtil.identifyDriver(ds.getJdbcUrl()));
			}
		} catch (Exception e) {
			throw new DbRuntimeException(e);
		}
		
		config.toBean(ds);//注入属性
		
		return ds;
	}
	
	/**
	 * 获得指定KEY对应的值，key1和key2为属性的两个名字，可以互作别名
	 * @param properties 属性
	 * @param key1 属性名
	 * @param key2 备用属性名
	 * @return 值
	 */
	private String getAndRemoveProperty(Setting setting, String key1, String key2){
		String value = (String) setting.remove(key1);
		if(StrUtil.isBlank(value)){
			value = (String) setting.remove(key2);
		}
		return value;
	}
}