    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}