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org.apache.avalon.fortress.impl.lookup
Class FortressServiceSelector

java.lang.Object
  org.apache.avalon.fortress.impl.lookup.FortressServiceSelector

All Implemented Interfaces:

ServiceSelector

public class FortressServiceSelector

extends java.lang.Object

implements ServiceSelector

This is the Default ServiceSelector for the Container. It provides a very simple abstraction, and makes it easy for the Container to manage the references.

Version:

CVS $Revision: 1.19 $ $Date: 2004/03/13 17:57:59 $

Author:

Avalon Development Team

Constructor Summary

FortressServiceSelector(Container container, java.lang.String key)
Creation of new service selector.

Method Summary

java.lang.String	getKey()
boolean	isSelectable(java.lang.Object hint) Check to see if a Object exists relative to the supplied policy.
void	release(java.lang.Object component) Return the Object when you are finished with it.
java.lang.Object	select(java.lang.Object hint) Select the Object associated with the given policy.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FortressServiceSelector

public FortressServiceSelector(Container container,
                               java.lang.String key)

Creation of new service selector.

Parameters:

container - the impl

key - a key

Method Detail

select

public java.lang.Object select(java.lang.Object hint)
                        throws ServiceException

Description copied from interface: ServiceSelector

Select the Object associated with the given policy. For instance, If the ServiceSelector has a Generator stored and referenced by a URL, the following call could be used:

 try
 {
     Generator input;
     input = (Generator)selector.select( new URL("foo://demo/url") );
 }
 catch (...)
 {
     ...
 }
 

Specified by:

select in interface ServiceSelector

Parameters:

hint - A criteria against which a Object is selected.

Returns:

an Object value

Throws:

ServiceException - If the requested Object cannot be supplied

isSelectable

public boolean isSelectable(java.lang.Object hint)

Description copied from interface: ServiceSelector

Check to see if a Object exists relative to the supplied policy.

Specified by:

isSelectable in interface ServiceSelector

Parameters:

hint - a Object containing the selection criteria

Returns:

True if the component is available, False if it not.

release

public void release(java.lang.Object component)

Description copied from interface: ServiceSelector

Return the Object when you are finished with it. This allows the ServiceSelector to handle the End-Of-Life Lifecycle events associated with the Object. Please note, that no Exception should be thrown at this point. This is to allow easy use of the ServiceSelector system without having to trap Exceptions on a release.

Specified by:

release in interface ServiceSelector

Parameters:

component - The Object we are releasing, may also be a null reference

getKey

public java.lang.String getKey()