| // Copyright 2006, 2009, 2011, 2013 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; |
| |
| |
| /** |
| * Similar to {@link Runnable} except that it returns a value. Used to represent any operation which can return a |
| * value. This is often used in situations where the code is to be executed in another threads. |
| * |
| * @param <T> the return value type |
| * @see org.apache.tapestry5.ioc.OperationTracker#invoke(String, Invokable) |
| * @see org.apache.tapestry5.ioc.services.ParallelExecutor#invoke(Invokable) |
| * @see IOOperation |
| */ |
| public interface Invokable<T> |
| { |
| /** |
| * Called to produce a value. |
| */ |
| T invoke(); |
| } |
