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    
015    package org.apache.tapestry5.services;
016    
017    import 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     */
030    public interface ComponentInstanceOperation
031    {
032        /** Called to perform the desired operation on a component instance. */
033        public void invoke(Component instance);
034    }