001    // Copyright 2011 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.ioc.internal.util;
016    
017    import org.apache.tapestry5.ioc.Invokable;
018    import org.slf4j.Logger;
019    
020    /**
021     * @since 5.3
022     */
023    public class LoggingInvokableWrapper<T> implements Invokable<T>
024    {
025        private final Logger logger;
026    
027        private final String message;
028    
029        private final Invokable<T> delegate;
030    
031        public LoggingInvokableWrapper(Logger logger, String message, Invokable<T> delegate)
032        {
033            this.logger = logger;
034            this.message = message;
035            this.delegate = delegate;
036        }
037    
038        public T invoke()
039        {
040            logger.debug(message);
041    
042            return delegate.invoke();
043        }
044    }