001// Copyright 2013 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.ioc;
016
017import java.io.IOException;
018
019/**
020 * An operation that, when performed, returns a value (like {@link Invokable}, but may throw an {@link java.io.IOException}.
021 *
022 * @since 5.4
023 * @see OperationTracker#perform(String, IOOperation)
024 */
025public interface IOOperation<T>
026{
027    /** Perform an operation and return a value, or throw the exception. */
028    T perform() throws IOException;
029}