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// 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  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
{
    /**
     * Called to produce a value.
     */
    T invoke();
}