donaldp 2002/11/08 20:46:18
Added: fortress/src/java/org/apache/excalibur/fortress/handler
ProxyHelper.java ProxyObjectFactory.java
Log:
Add in proxy helper stuff so that we can use a Proxying ObjectFactory
Revision Changes Path
1.1
jakarta-avalon-excalibur/fortress/src/java/org/apache/excalibur/fortress/handler/ProxyHelper.java
Index: ProxyHelper.java
===================================================================
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software
* itself, if and wherever such third-party acknowledgments
* normally appear.
*
* 4. The names "Jakarta", "Avalon", and "Apache Software Foundation"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.excalibur.fortress.handler;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.io.Serializable;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.component.Composable;
import org.apache.avalon.framework.component.Recomposable;
import org.apache.avalon.framework.logger.Loggable;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.context.Recontextualizable;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Reconfigurable;
import org.apache.avalon.framework.parameters.Parameterizable;
import org.apache.avalon.framework.parameters.Reparameterizable;
import org.apache.avalon.framework.activity.Initializable;
import org.apache.avalon.framework.activity.Startable;
import org.apache.avalon.framework.activity.Suspendable;
import org.apache.avalon.framework.activity.Disposable;
/**
* Create a Component proxy. Requires JDK 1.3+
*
* @author <a href="mailto:bloritsch@;apache.org">Berin Loritsch</a>
* @author <a href="mailto:peter at apache.org">Peter Donald</a>
*/
final class ProxyHelper
{
/**
* The list interfaces that will not be proxied.
*/
private static final Class[] INVALID_INTERFACES = new Class[]
{
Loggable.class,
LogEnabled.class,
Contextualizable.class,
Recontextualizable.class,
Composable.class,
Recomposable.class,
Serviceable.class,
Configurable.class,
Reconfigurable.class,
Parameterizable.class,
Reparameterizable.class,
Initializable.class,
Startable.class,
Suspendable.class,
Disposable.class,
Serializable.class
};
/**
* Get the Component wrapped in the proxy.
*/
public static Component createProxy( Object service ) throws Exception
{
final Class clazz = service.getClass();
final Class[] workInterfaces = guessWorkInterfaces( clazz );
return (Component)Proxy.newProxyInstance( clazz.getClassLoader(),
workInterfaces,
new PassThroughInvocationHandler(
service ) );
}
/**
* Get the target object from specified proxy.
*
* @param proxy the proxy object
* @return the target object
* @throws Exception if unable to aquire target object,
* or specified object is not a proxy
*/
public static Object getObject( final Object proxy )
throws Exception
{
if( null == proxy )
{
throw new NullPointerException( "proxy" );
}
if( !Proxy.isProxyClass( proxy.getClass() ) )
{
final String message = "object is not a proxy";
throw new IllegalArgumentException( message );
}
final PassThroughInvocationHandler handler =
(PassThroughInvocationHandler)Proxy.getInvocationHandler( proxy );
return handler.getObject();
}
/**
* Get a list of interfaces to proxy by scanning through
* all interfaces a class implements and skipping invalid interfaces
* (as defined in {@link #INVALID_INTERFACES}).
*
* @param clazz the class
* @return the list of interfaces to proxy
*/
private static Class[] guessWorkInterfaces( final Class clazz )
{
final ArrayList list = new ArrayList();
final Class[] interfaces = clazz.getInterfaces();
boolean skip = false;
for( int i = 0; i < interfaces.length; i++ )
{
skip = false;
for( int j = 0; j < INVALID_INTERFACES.length; j++ )
{
if( interfaces[ i ] == INVALID_INTERFACES[ j ] )
{
skip = true;
continue;
}
}
if( !skip )
{
list.add( interfaces[ i ] );
}
}
list.add( Component.class );
return (Class[])list.toArray( new Class[ list.size() ] );
}
}
1.1
jakarta-avalon-excalibur/fortress/src/java/org/apache/excalibur/fortress/handler/ProxyObjectFactory.java
Index: ProxyObjectFactory.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.excalibur.fortress.handler;
import org.apache.excalibur.mpool.ObjectFactory;
/**
* An ObjectFactory that delegates to another ObjectFactory
* and proxies results of that factory.
*
* @author <a href="mailto:peter at apache.org">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/11/09 04:46:18 $
*/
public class ProxyObjectFactory
implements ObjectFactory
{
/**
* The underlying object factory that this factory proxies.
*/
private final ObjectFactory m_objectFactory;
/**
* Create factory that delegates to specified factory.
*
* @param objectFactory the factory to delegate to
*/
public ProxyObjectFactory( final ObjectFactory objectFactory )
{
if( null == objectFactory )
{
throw new NullPointerException( "objectFactory" );
}
m_objectFactory = objectFactory;
}
/**
* Create a new instance from delegated factory and proxy it.
*
* @return the proxied object
* @throws Exception if unabel to create new instance
*/
public Object newInstance()
throws Exception
{
final Object object = m_objectFactory.newInstance();
return ProxyHelper.createProxy( object );
}
/**
* Return the class created by factory.
*
* @return the class created by factory.
*/
public Class getCreatedClass()
{
return m_objectFactory.getCreatedClass();
}
/**
* Dispose of objects created by this factory.
* Involves deproxying object and delegating to real ObjectFactory.
*
* @param object the proxied object
* @throws Exception if unable to dispose of object
*/
public void dispose( final Object object )
throws Exception
{
final Object target = ProxyHelper.getObject( object );
m_objectFactory.dispose( target );
}
}
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