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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;
/**
* A specialization of a CompositeContext that is able to automatically resolve references
* for its children using EntryPoint or Service interfaces exposed by it or, recursively, any
* of it parents.
*
* @version $Rev$ $Date$
*/
public interface AutowireContext extends CompositeContext {
/**
* Invoked by child contexts to return an an autowire target. Resolved targets may be entry points or
* components in the parent or its ancestors, or entry points in a sibling context
*
* @param instanceInterface the type of service being requested
* @return a reference to the requested service or null if none can be found
* @throws AutowireResolutionException if an error occurs attempting to resolve an autowire
*/
<T> T resolveInstance(Class<T> instanceInterface) throws AutowireResolutionException;
/**
* Invoked by a parent context to return an autowire target in a child. Resolved targets must be entry points.
* For example, given a parent P and two siblings, A and B, A would request an autowire by invoking
* {@link #resolveInstance(Class<T>)} on P, which in turn could invoke the present method on B in order to resolve
* a target.
*
* @param instanceInterface the type of service being requested
* @return a reference to the requested service or null if none can be found
* @throws AutowireResolutionException if an error occurs attempting to resolve an autowire
*/
<T> T resolveExternalInstance(Class<T> instanceInterface) throws AutowireResolutionException;
}
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