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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;
import org.apache.tuscany.core.wire.SourceWireFactory;
/**
* The runtime artifact representing an entry point, <code>EntryPointContext</code> manages wire handler
* instances that expose service operations offered by a component in the parent composite. The wire handler
* instance is responsible for dispatching the request down an wire chain to the target instance. The wire
* chain may contain {@link org.apache.tuscany.core.wire.Interceptor}s and
* {@link org.apache.tuscany.core.wire.MessageHandler}s that implement policies or perform mediations on the
* wire.
* <p>
* Entry point contexts are used by transport binding artifacts to invoke an operation on a service. The transport
* binding uses an {@link java.lang.reflect.InvocationHandler} instance obtained from the <code>EntryPointContext</code>
* to perform the wire as in:
*
* <pre>
* CompositeContext compositeContext = ...
* EntryPointContext ctx = (EntryPointContext) compositeContext.getContext("source");
* Assert.assertNotNull(ctx);
* InvocationHandler handler = (InvocationHandler) ctx.getHandler();
* Object response = handler.invoke(null, operation, new Object[] { param });
* </pre>
*
* The <code>Proxy</code> instance passed to <code>InvocationHandler</code> may be null as the client is invoking
* directly on the handler.
* <p>
* Alternatively, the following will return a proxy implementing the service interface exposed by the entry point:
*
* <pre>
* CompositeContext compositeContext = ...
* EntryPointContext ctx = (EntryPointContext) compositeContext.getContext("source");
* Assert.assertNotNull(ctx);
* HelloWorld proxy = (Helloworld) ctx.getInstance(null); // service name not necessary
* </pre>
*
* The proxy returned will be backed by the entry point wire chain.
*
* @version $Rev$ $Date$
*/
public interface EntryPointContext extends Context {
/**
* Returns the handler responsible for flowing a request through the entry point
* @throws TargetException
*/
public Object getHandler() throws TargetException;
/**
* Returns the service interface configured for the entry poitn
*/
public Class getServiceInterface();
}
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