001// Copyright 2010 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.services;
016
017import org.apache.tapestry5.runtime.Component;
018
019/**
020 * An operation that requires an instance of a component.
021 * This is a simpler alternative to a {@link ComponentMethodAdvice} that avoids
022 * the most common error case: forgetting to invoke {@link ComponentMethodInvocation#proceed()} (which
023 * can be very difficult to track down!).
024 * 
025 * @since 5.2.0
026 * @see TransformMethod#addOperationAfter(ComponentInstanceOperation)
027 * @see TransformMethod#addOperationBefore(ComponentInstanceOperation)
028 * @deprecated Deprecated in 5.3 with no replacement
029 */
030public interface ComponentInstanceOperation
031{
032    /** Called to perform the desired operation on a component instance. */
033    public void invoke(Component instance);
034}