JDCConnection.java

package com.alcatel_lucent.nz.wnmsextract.database;
/*
 * This file is part of wnmsextract.
 *
 * wnmsextract is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * wnmsextract is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Map;
import java.util.Properties;
//import java.util.concurrent.Executor;

/**
 * JDC style implementation of Connection 
 * @author jnramsay
 */
public class JDCConnection implements Connection {

	private JDCConnectionPool pool;
	private Connection conn;
	private boolean inuse;
	private long timestamp;


	/**
	 * Constructor taking a connection pool and a connection instance
	 * @param conn {@link java.sql.Connection } instance for wrapping
	 * @param pool Connection pool
	 */
	public JDCConnection(Connection conn, JDCConnectionPool pool) {
		this.conn = conn;
		this.pool = pool;
		this.inuse = false;
		this.timestamp = 0;
	}

	/**
	 * Connection pool lock mechanism
	 * @return Whether a connection is being leased or setting 
	 * its lease as active if not 
	 */
	public synchronized boolean lease() {
		if(inuse)  {
			return false;
		}
		else {
			inuse = true;
			timestamp = System.currentTimeMillis();
			return true;
		}
	}
	/**
	 * Validation achieved by testing whether metadata is available on the connection
	 * @return
	 */
	public boolean validate() {
		try {
			conn.getMetaData();
		}
		catch (Exception e) {
			return false;
		}
		return true;
	}

	/**
	 * Whether the lease is being used or not
	 * @return
	 */
	public boolean inUse() {
		return inuse;
	}

	public long getLastUse() {
		return timestamp;
	}

	@Override
	public void close() throws SQLException {
		pool.returnConnection(this);
	}
	/**
	 * Kill the current lease
	 */
	protected void expireLease() {
		inuse = false;
	}

	protected Connection getConnection() {
		return conn;
	}
	
	//===============RE IMPLEMENTED METHODS===================

	@Override
	public PreparedStatement prepareStatement(String sql) throws SQLException {
		return conn.prepareStatement(sql);
	}

	@Override
	public CallableStatement prepareCall(String sql) throws SQLException {
		return conn.prepareCall(sql);
	}

	@Override
	public Statement createStatement() throws SQLException {
		return conn.createStatement();
	}

	@Override
	public String nativeSQL(String sql) throws SQLException {
		return conn.nativeSQL(sql);
	}

	@Override
	public void setAutoCommit(boolean autoCommit) throws SQLException {
		conn.setAutoCommit(autoCommit);
	}

	@Override
	public boolean getAutoCommit() throws SQLException {
		return conn.getAutoCommit();
	}

	@Override
	public void commit() throws SQLException {
		conn.commit();
	}

	@Override
	public void rollback() throws SQLException {
		conn.rollback();
	}

	@Override
	public boolean isClosed() throws SQLException {
		return conn.isClosed();
	}

	@Override
	public DatabaseMetaData getMetaData() throws SQLException {
		return conn.getMetaData();
	}

	@Override
	public void setReadOnly(boolean readOnly) throws SQLException {
		conn.setReadOnly(readOnly);
	}

	@Override
	public boolean isReadOnly() throws SQLException {
		return conn.isReadOnly();
	}

	@Override
	public void setCatalog(String catalog) throws SQLException {
		conn.setCatalog(catalog);
	}

	@Override
	public String getCatalog() throws SQLException {
		return conn.getCatalog();
	}

	@Override
	public void setTransactionIsolation(int level) throws SQLException {
		conn.setTransactionIsolation(level);
	}

	@Override
	public int getTransactionIsolation() throws SQLException {
		return conn.getTransactionIsolation();
	}

	@Override
	public SQLWarning getWarnings() throws SQLException {
		return conn.getWarnings();
	}

	@Override
	public void clearWarnings() throws SQLException {
		conn.clearWarnings();
	}


	//===============UN RE IMPLEMENTED METHODS===================

	@Override
	public Array createArrayOf(String typeName, Object[] elements)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Blob createBlob() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Clob createClob() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public NClob createNClob() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public SQLXML createSQLXML() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Statement createStatement(int resultSetType, int resultSetConcurrency)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Statement createStatement(int resultSetType, int resultSetConcurrency,
			int resultSetHoldability) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Struct createStruct(String typeName, Object[] attributes)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Properties getClientInfo() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String getClientInfo(String name) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int getHoldability() throws SQLException {
		// TODO Auto-generated method stub
		return 0;
	}

	@Override
	public Map<String, Class<?>> getTypeMap() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public boolean isValid(int timeout) throws SQLException {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public CallableStatement prepareCall(String sql, int resultSetType,
			int resultSetConcurrency) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public CallableStatement prepareCall(String sql, int resultSetType,
			int resultSetConcurrency, int resultSetHoldability) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int[] columnIndexes)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public PreparedStatement prepareStatement(String sql, String[] columnNames)
			throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int resultSetType,
			int resultSetConcurrency) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public PreparedStatement prepareStatement(String sql, int resultSetType,
			int resultSetConcurrency, int resultSetHoldability) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void releaseSavepoint(Savepoint savepoint) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public void rollback(Savepoint savepoint) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public void setClientInfo(Properties properties)
			throws SQLClientInfoException {
		// TODO Auto-generated method stub

	}

	@Override
	public void setClientInfo(String name, String value)
			throws SQLClientInfoException {
		// TODO Auto-generated method stub

	}

	@Override
	public void setHoldability(int holdability) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public Savepoint setSavepoint() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public Savepoint setSavepoint(String name) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public boolean isWrapperFor(Class<?> iface) throws SQLException {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public <T> T unwrap(Class<T> iface) throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}
/* Java 1.7 JDBC 4 methods
	@Override
	public void setSchema(String schema) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public String getSchema() throws SQLException {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void abort(Executor executor) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
		// TODO Auto-generated method stub

	}

	@Override
	public int getNetworkTimeout() throws SQLException {
		// TODO Auto-generated method stub
		return 0;
	}
*/
}