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This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.
There is a newer version: 6.1.1
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/*
 * Copyright 2007 Daniel Spiewak
 * 
 * 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 is 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 net.java.ao;

import net.java.ao.sql.CallStackProvider;
import net.java.ao.sql.LoggingInterceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.time.Clock;
import java.util.Objects;


final class DelegateConnectionHandler implements InvocationHandler {
    private static final Logger LOGGER = LoggerFactory.getLogger(DelegateConnectionHandler.class);
    private static final CallStackProvider CALL_STACK_PROVIDER = new CallStackProvider();
    public static final String CREATE_STATEMENT_METHOD = "createStatement";
    public static final String PREPARE_STATEMENT_METHOD = "prepareStatement";

    private final Connection delegate;
    private boolean closeable;
    private boolean extraLogging;

    private DelegateConnectionHandler(Connection delegate) {
        this.delegate = Objects.requireNonNull(delegate);
        this.closeable = true;
        this.extraLogging = false;
    }

    private DelegateConnectionHandler(Connection delegate, boolean extraLogging) {
        this(delegate);

        this.extraLogging = extraLogging;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (isSetCloseableMethod(method)) {
            setCloseable((Boolean) args[0]);
            return Void.TYPE;
        } else if (isIsCloseableMethod(method)) {
            return isCloseable();
        } else if (isCloseMethod(method)) {
            close();
            return Void.TYPE;
        } else if (isIsClosedMethod(method)) {
            return isClosed();
        }

        if (isExtraLoggingEnabled()) {
            if (method.getName().equals(CREATE_STATEMENT_METHOD)) {
                return new DelegateLoggingStatement(
                        (Statement) delegate(method, args),
                        new LoggingInterceptor(LOGGER, CALL_STACK_PROVIDER, Clock.systemUTC(), isCallStackLoggingEnabled())
                );
            } else if (method.getName().equals(PREPARE_STATEMENT_METHOD)) {
                return new DelegateLoggingPreparedStatement(
                        (PreparedStatement) delegate(method, args),
                        new LoggingInterceptor(LOGGER, CALL_STACK_PROVIDER, Clock.systemUTC(), isCallStackLoggingEnabled()),
                        (String) args[0]
                );
            }
        }

        return delegate(method, args);
    }

    private boolean isCallStackLoggingEnabled() {
        return Boolean.getBoolean("net.java.ao.sql.logging.callstack");
    }

    private boolean isExtraLoggingEnabled() {
        return extraLogging;
    }

    private void setCloseable(boolean closeable) {
        this.closeable = closeable;
    }

    private boolean isCloseable() {
        return closeable;
    }

    private void close() throws SQLException {
        if (isCloseable()) {
            delegate.close();
        }
    }

    private boolean isClosed() throws SQLException {
        return delegate.isClosed();
    }

    private Object delegate(Method method, Object[] args) throws Throwable {
        final Method m = delegate.getClass().getMethod(method.getName(), method.getParameterTypes());
        m.setAccessible(true);
        try {
            return m.invoke(delegate, args);
        } catch (InvocationTargetException e) {
            throw e.getCause();
        }
    }

    public static DelegateConnection newInstance(Connection c) {
        return newInstance(c, false);
    }

    public static DelegateConnection newInstance(Connection c, boolean extraLogging) {
        return (DelegateConnection) Proxy.newProxyInstance(
                DelegateConnectionHandler.class.getClassLoader(),
                new Class[]{DelegateConnection.class},
                new DelegateConnectionHandler(c, extraLogging)
        );
    }

    private static boolean isSetCloseableMethod(Method method) {
        return method.getName().equals("setCloseable")
                && method.getParameterTypes().length == 1
                && method.getParameterTypes()[0].equals(boolean.class);
    }


    private static boolean isIsCloseableMethod(Method method) {
        return method.getName().equals("isCloseable")
                && method.getParameterTypes().length == 0;
    }

    private static boolean isCloseMethod(Method method) {
        return method.getName().equals("close")
                && method.getParameterTypes().length == 0;
    }

    private static boolean isIsClosedMethod(Method method) {
        return method.getName().equals("isClosed")
                && method.getParameterTypes().length == 0;
    }
}