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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;
/**
* Manages instances of a runtime artifact. An <code>InstanceContext</code> may contain child contexts which
* themselves manage implementation instances or it may be a leaf context.
*
* @see org.apache.tuscany.core.context.SimpleComponentContext
* @see org.apache.tuscany.core.context.AggregateContext
* @see org.apache.tuscany.core.context.EntryPointContext
* @see org.apache.tuscany.core.context.ExternalServiceContext
*
* @version $Rev$ $Date$
*/
public interface InstanceContext extends Context {
/**
* Returns the instance associated with the requested name, which may be in a simple or compound form. Simple (i.e.
* leaf) contexts will return an instance associated with the service name part of the compound name, which may be
* null.
* <p>
* Aggregate 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 aggregate 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 AggregateContext
* @see org.apache.tuscany.model.assembly.EntryPoint
*/
public Object getInstance(QualifiedName qName) throws TargetException;
/**
* Returns an instance associated with the requested name without notifying <code>ContextEventListener</code>s
* that may be registered with this context on instance creation. Note that {@link #getInstance(QualifiedName)}
* should generally be called and this method is only provided as an optimization for particular circumstances.
*
* @param qName a qualified name of the requested instance
* @param notify whether to notify <code>ContextEventListener</code>s
* @return the instance or a proxy to it
* @throws TargetException if an error occurs retrieving the instance or proxy
* @see LifecycleEventListener
*/
public Object getInstance(QualifiedName qName, boolean notify) throws TargetException;
/**
* Returns the implementation instance associated witht he component. An implementation instance does not
* have a proxy invocation chainXXX
* @return
* @throws TargetException
*/
public Object getImplementationInstance() throws TargetException;
public Object getImplementationInstance(boolean notify) throws TargetException;
}
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