mcconnell 2002/12/16 21:00:08
Added: assembly/src/java/org/apache/avalon/assembly/lifecycle/composition
StandardServiceManager.java
Removed: assembly/src/java/org/apache/avalon/assembly/lifecycle/composition
DefaultServiceManager.java
Log:
DefaultServiceManager renamed to StandardServiceManager.
Revision Changes Path
1.1
avalon-sandbox/assembly/src/java/org/apache/avalon/assembly/lifecycle/composition/StandardServiceManager.java
Index: StandardServiceManager.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.avalon.assembly.lifecycle.composition;
import java.util.Hashtable;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.assembly.appliance.Appliance;
import org.apache.avalon.meta.info.DependencyDescriptor;
/**
* Helper class the implements the <code>ServiceManager</code> interface and
* is supplied to componets during lifecyle processing.
* @author Stephen McConnell <[EMAIL PROTECTED]>
*/
public class StandardServiceManager extends AbstractLogEnabled implements
ServiceManager
{
//========================================================================
// state
//========================================================================
/**
* A map of resources keyed by lookup role.
*/
private Appliance m_appliance;
/**
* A table of appliance instances keyed by the object that was provided
* by the appliance so that we can locate the correct appliance when
* releasing the object.
*/
private Hashtable m_table = new Hashtable();
//========================================================================
// constructor
//========================================================================
/**
* Construct a new ServiceManager.
* @param profile the component profile
*/
public StandardServiceManager( Appliance appliance )
{
m_appliance = appliance;
}
//========================================================================
// ServiceManager
//========================================================================
/**
* Returns true if a provider exists for the supplied role.
* @param role the service identifier
* @return boolean TRUE if the service is available else FALSE
*/
public boolean hasService( String role )
{
return ( m_appliance.getServiceProvider( role ) != null );
}
/**
* Retrieve Object by role from ComponentLocator.
* @param role the role
* @return the Object
* @throws ServiceException if an error occurs
*/
public Object lookup( String role ) throws ServiceException
{
if( role == null )
{
throw new NullPointerException( "role" );
}
DependencyDescriptor dependency =
m_appliance.getProfile().getType().getDependency( role );
Appliance provider = m_appliance.getServiceProvider( role );
if( provider == null )
{
final String error =
"Internal error - incorrect assembly in appliance: " + m_appliance
+ ". A null provider was retured for the dependency: " + dependency;
throw new ServiceException( role, error );
}
try
{
Object object = provider.access( dependency );
m_table.put( object, provider );
return object;
}
catch( Throwable e )
{
final String error =
"Unexpected internal error while accessing a service provider in
appliance: "
+ m_appliance
+ " for the role: " + role;
throw new ServiceException( role, error, e );
}
}
/**
* Release a pooled object.
* @param object a pooled object
*/
public void release( Object object )
{
Appliance provider = (Appliance) m_table.get( object );
if( provider == null )
{
if( getLogger().isWarnEnabled() )
{
final String warning =
"Inconsistent release request - the object: "
+ object.getClass().getName()
+ "/" + System.identityHashCode( object )
+ " was not provided by this manager.";
getLogger().warn( warning );
}
}
else
{
provider.release( object );
m_table.remove( object );
}
}
}
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