// Copyright 2009 The Apache Software Foundation
//
// 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.tapestry5.ioc.services;
import org.apache.tapestry5.ioc.ObjectCreator;
/**
* A <a href="http://en.wikipedia.org/wiki/Thunk">thunk</a> is a delayed calculation. In Java and Tapestry terms, a
* Thunk is a proxy object of a particular interface that delegates all methods to an object of the same type obtained
* from an {@link org.apache.tapestry5.ioc.ObjectProvider}. This is used by {@link
* org.apache.tapestry5.ioc.services.LazyAdvisor} to build lazy thunk proxies.
*
* @since 5.1.0.1
*/
public interface ThunkCreator
{
/**
* Creates a Thunk of the given proxy type.
*
* @param proxyType type of object to create (must be an interface)
* @param objectCreator provides an instance of the same type on demand (may be invoked multiple times)
* @param description to be returned from the thunk's toString() method
* @param <T> type of thunk
* @return thunk of given type
*/
<T> T createThunk(Class<T> proxyType, ObjectCreator objectCreator, String description);
}