contextconnectionpool.java

来自「Jodd是一个开源的公用Java基础类库」· Java 代码 · 共 69 行

package jodd.db.pool;

import java.sql.Connection;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

/**
 * Tomcat4 alike connection pools that uses Context for initilization.
 */
public class ContextConnectionPool implements ConnectionPool {

	// ---------------------------------------------------------------- pool properties

	private String envContextName;
	public void setEnvContextName(String s) {
		envContextName = s;
	}

	private String dataSourceName;
	public void setDataSourceName(String s) {
		dataSourceName = s;
	}

	// ---------------------------------------------------------------- init/close

	private DataSource ds;

	public void init() throws SQLException {
		try {
			Context initContext = new InitialContext();
			Context envContext = (Context) initContext.lookup(envContextName);
			ds = (DataSource) envContext.lookup(dataSourceName);
		} catch (NamingException ne) {
			throw new SQLException("Context can not be found: " + envContextName + ", " + dataSourceName);
		}
	}

	public void close() {
	}


	// ---------------------------------------------------------------- get/free

	public Connection getConnection() throws SQLException {
		return ds.getConnection();
	}

	/**
	 * Return connection to connection pool
	 *
	 * @param conn   database connection
	 */
	public void freeConnection(Connection conn) {
		try {
			if (conn != null) {
				conn.close();
			}
		} catch (SQLException e) {
		}
	}


}