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WrapperBase.java
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Wed, Aug 21, 01:23

WrapperBase.java
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/*
Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
This program 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; version 2
of the License.
This program 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, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc.jdbc2.optional;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.sql.SQLException;
import java.util.Map;
import com.mysql.jdbc.ExceptionInterceptor;
import com.mysql.jdbc.SQLError;
import com.mysql.jdbc.Util;
/**
* Base class for all wrapped instances created by LogicalHandle
*/
abstract class WrapperBase {
protected MysqlPooledConnection pooledConnection;
/**
* Fires connection error event if required, before re-throwing exception
*
* @param sqlEx
* the SQLException that has occurred
* @throws SQLException
* (rethrown)
*/
protected void checkAndFireConnectionError(SQLException sqlEx) throws SQLException {
if (this.pooledConnection != null) {
if (SQLError.SQL_STATE_COMMUNICATION_LINK_FAILURE.equals(sqlEx.getSQLState())) {
this.pooledConnection.callConnectionEventListeners(MysqlPooledConnection.CONNECTION_ERROR_EVENT, sqlEx);
}
}
throw sqlEx;
}
protected Map<Class<?>, Object> unwrappedInterfaces = null;
protected ExceptionInterceptor exceptionInterceptor;
protected WrapperBase(MysqlPooledConnection pooledConnection) {
this.pooledConnection = pooledConnection;
this.exceptionInterceptor = this.pooledConnection.getExceptionInterceptor();
}
protected class ConnectionErrorFiringInvocationHandler implements InvocationHandler {
Object invokeOn = null;
public ConnectionErrorFiringInvocationHandler(Object toInvokeOn) {
this.invokeOn = toInvokeOn;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if ("equals".equals(method.getName())) {
// Let args[0] "unwrap" to its InvocationHandler if it is a proxy.
return args[0].equals(this);
}
Object result = null;
try {
result = method.invoke(this.invokeOn, args);
if (result != null) {
result = proxyIfInterfaceIsJdbc(result, result.getClass());
}
} catch (InvocationTargetException e) {
if (e.getTargetException() instanceof SQLException) {
checkAndFireConnectionError((SQLException) e.getTargetException());
} else {
throw e;
}
}
return result;
}
/**
* Recursively checks for interfaces on the given object to determine
* if it implements a java.sql interface, and if so, proxies the
* instance so that we can catch and fire SQL errors.
*
* @param toProxy
* @param clazz
*/
private Object proxyIfInterfaceIsJdbc(Object toProxy, Class<?> clazz) {
Class<?>[] interfaces = clazz.getInterfaces();
for (Class<?> iclass : interfaces) {
String packageName = Util.getPackageName(iclass);
if ("java.sql".equals(packageName) || "javax.sql".equals(packageName)) {
return Proxy.newProxyInstance(toProxy.getClass().getClassLoader(), interfaces, new ConnectionErrorFiringInvocationHandler(toProxy));
}
return proxyIfInterfaceIsJdbc(toProxy, iclass);
}
return toProxy;
}
}
}

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