mcconnell 2002/09/11 23:03:10
Added: meta/src/java/org/apache/excalibur/meta/info/builder
SerializedServiceCreator.java ServiceBuilder.java
Log:
Addition of serialized service info handlers.
Revision Changes Path
1.1
jakarta-avalon-excalibur/meta/src/java/org/apache/excalibur/meta/info/builder/SerializedServiceCreator.java
Index: SerializedServiceCreator.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.meta.info.builder;
import org.apache.excalibur.meta.info.Service;
import java.io.InputStream;
import java.io.ObjectInputStream;
/**
* Create {@link Service} from stream made up of a serialized object.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Stephen McConnell</a>
* @version $Revision: 1.1 $ $Date: 2002/09/12 06:03:10 $
*/
public class SerializedServiceCreator
implements ServiceCreator
{
/**
* Create of a service instance from a serialized form.
* @param key parameter not used
* @param input the input stream
* @return the meta-info instance that describes the component type
* @exception Exception if an error occurs
*/
public Service createService( final String key, final InputStream input )
throws Exception
{
final ObjectInputStream ois = new ObjectInputStream( input );
return (Service)ois.readObject();
}
}
1.1
jakarta-avalon-excalibur/meta/src/java/org/apache/excalibur/meta/info/builder/ServiceBuilder.java
Index: ServiceBuilder.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.meta.info.builder;
import java.io.InputStream;
import org.apache.avalon.excalibur.i18n.ResourceManager;
import org.apache.avalon.excalibur.i18n.Resources;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.logger.Logger;
import org.apache.excalibur.meta.info.Service;
/**
* A ServiceBuilder is responsible for building {@link Service}
* objects from Configuration objects.
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Stephen McConnell</a>
* @version $Revision: 1.1 $ $Date: 2002/09/12 06:03:10 $
*/
public final class ServiceBuilder
extends AbstractLogEnabled
{
private static final Resources REZ =
ResourceManager.getPackageResources( ServiceBuilder.class );
private final ServiceCreator m_xmlServiceCreator = createXMLServiceCreator();
private final ServiceCreator m_serialServiceCreator = new
SerializedServiceCreator();
/**
* Setup logging for all subcomponents
* @param logger the logging channel
*/
public void enableLogging( final Logger logger )
{
super.enableLogging( logger );
setupLogger( m_serialServiceCreator );
if( null != m_xmlServiceCreator )
{
setupLogger( m_xmlServiceCreator );
}
}
/**
* Create a {@link Service} object for specified Class.
*
* @param clazz The class of Component
* @return the created Service
* @throws Exception if an error occurs
*/
public Service build( final Class clazz )
throws Exception
{
return build( clazz.getName(), clazz.getClassLoader() );
}
/**
* Create a {@link Service} object for specified
* classname, in specified ClassLoader.
*
* @param classname The classname of Component
* @param classLoader the ClassLoader to load info from
* @return the created Service
* @throws Exception if an error occurs
*/
public Service build( final String classname,
final ClassLoader classLoader )
throws Exception
{
final Service info = buildFromSerDescriptor( classname, classLoader );
if( null != info )
{
return info;
}
else
{
return buildFromXMLDescriptor( classname, classLoader );
}
}
/**
* Build Service from the XML descriptor format.
*
* @param classname The classname of Component
* @param classLoader the ClassLoader to load info from
* @return the created Service
* @throws Exception if an error occurs
*/
private Service buildFromSerDescriptor( final String classname,
final ClassLoader classLoader )
throws Exception
{
final String xinfo =
classname.replace( '.', '/' ) + ".sinfo";
final InputStream inputStream =
classLoader.getResourceAsStream( xinfo );
if( null == inputStream )
{
return null;
}
return m_serialServiceCreator.createService( classname, inputStream );
}
/**
* Build Service from the XML descriptor format.
*
* @param classname The classname of Component
* @param classLoader the ClassLoader to load info from
* @return the created Service
* @throws Exception if an error occurs
*/
private Service buildFromXMLDescriptor( final String classname,
final ClassLoader classLoader )
throws Exception
{
//
// get the input stream for the .xservice resource
//
final String xservice =
classname.replace( '.', '/' ) + ".xservice";
final InputStream inputStream =
classLoader.getResourceAsStream( xservice );
if( null == inputStream )
{
return new Service( null );
}
//
// build the type
//
final ServiceCreator xmlServiceCreator = getXMLServiceCreator( classname );
return xmlServiceCreator.createService( classname, inputStream );
}
/**
* Utility to get xml info builder, else throw
* an exception if missing descriptor.
*
* @return the ServiceCreator
*/
private ServiceCreator getXMLServiceCreator( final String classname )
throws Exception
{
if( null != m_xmlServiceCreator )
{
return m_xmlServiceCreator;
}
else
{
final String message =
REZ.getString( "builder.missing-xml-creator.error",
classname );
throw new Exception( message );
}
}
/**
* Utility to get XMLServiceCreator if XML files are on
* ClassPath.
*
* @return the XML {@link ServiceCreator}
*/
private static ServiceCreator createXMLServiceCreator()
{
ServiceCreator xmlServiceCreator = null;
try
{
xmlServiceCreator = new XMLServiceCreator();
}
catch( final Exception e )
{
//Ignore it if ClassNot found due to no
//XML Classes on classpath
}
return xmlServiceCreator;
}
}
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