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Instrumentation of statement execution in JDBC connected databases.
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/* Copyright (C) 2017 Maurits van der Schee
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.tqdev.metrics.jdbc;

import java.io.Closeable;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

import javax.sql.DataSource;

import com.tqdev.metrics.core.MetricRegistry;

/**
 * The Class InstrumentedDataSource.
 */
public class InstrumentedDataSource implements DataSource, Closeable {

	/** The wrapped data source. */
	private DataSource dataSource;

	/** The metric registry. */
	private MetricRegistry registry;

	/**
	 * Instantiates a new instrumented data source.
	 *
	 * @param wrapped
	 *            the wrapped
	 * @param registry
	 *            the registry
	 */
	public InstrumentedDataSource(DataSource wrapped, MetricRegistry registry) {
		this.dataSource = wrapped;
		this.registry = registry;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.DataSource#getConnection()
	 */
	@Override
	public Connection getConnection() throws SQLException {
		return new InstrumentedConnection(dataSource.getConnection(), registry);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.DataSource#getConnection(java.lang.String,
	 * java.lang.String)
	 */
	@Override
	public Connection getConnection(String username, String password) throws SQLException {
		return new InstrumentedConnection(dataSource.getConnection(username, password), registry);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.CommonDataSource#getLogWriter()
	 */
	@Override
	public PrintWriter getLogWriter() throws SQLException {
		return dataSource.getLogWriter();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.CommonDataSource#setLogWriter(java.io.PrintWriter)
	 */
	@Override
	public void setLogWriter(PrintWriter out) throws SQLException {
		dataSource.setLogWriter(out);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.CommonDataSource#setLoginTimeout(int)
	 */
	@Override
	public void setLoginTimeout(int seconds) throws SQLException {
		dataSource.setLoginTimeout(seconds);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.CommonDataSource#getLoginTimeout()
	 */
	@Override
	public int getLoginTimeout() throws SQLException {
		return dataSource.getLoginTimeout();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see javax.sql.CommonDataSource#getParentLogger()
	 */
	@Override
	public Logger getParentLogger() throws SQLFeatureNotSupportedException {
		return dataSource.getParentLogger();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.sql.Wrapper#unwrap(java.lang.Class)
	 */
	@Override
	public  T unwrap(Class iface) throws SQLException {
		return dataSource.unwrap(iface);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.sql.Wrapper#isWrapperFor(java.lang.Class)
	 */
	@Override
	public boolean isWrapperFor(Class iface) throws SQLException {
		return dataSource.isWrapperFor(iface);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.Closeable#close()
	 */
	@Override
	public void close() throws IOException {
		if (dataSource instanceof Closeable) {
			((Closeable) dataSource).close();
		} else {
			try {
				Method close = dataSource.getClass().getMethod("close");
				close.invoke(dataSource);
			} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
				// Ignore, no parameterless close method defined
			}
		}
	}
}