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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tuscany.core.context;
/**
* An entity that provides an execution context for a runtime artifact or artifacts. A <code>Context</code> may
* be a composite, managing child contexts or it may be an atomic, i.e. leaf, context.
*
* @version $Rev$ $Date$
*/
public interface Context extends EventPublisher, Lifecycle {
/**
* Returns the instance associated with the requested name, which may be in a atomic or composite form. Atomic (i.e.
* leaf) contexts will return an instance associated with the service name part of the compound name, which may be
* null.
* <p/>
* Composite contexts will return an instance (likely a proxy) of a contained entry point context. In this case, the
* port name on the qualified name will correspond to the composite context name and the part name will be used to
* retrieve the contained entry point context. The latter may be null. If the contained context is not an entry
* point context, an exception will be thrown.
*
* @param qName a qualified name of the requested instance
* @return the implementation instance or a proxy to it
* @throws TargetException
* if an error occurs retrieving the instance or the requested component is not an entry
* point.
* @see CompositeContext
* @see org.apache.tuscany.model.assembly.EntryPoint
*/
public Object getInstance(QualifiedName qName) throws TargetException;
}
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