001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.spi;
018    
019    import org.apache.camel.CamelContext;
020    import org.apache.camel.Processor;
021    import org.apache.camel.model.ProcessorDefinition;
022    
023    /**
024     * The purpose of this interface is to allow an implementation to wrap
025     * processors in a route with interceptors.  For example, a possible
026     * usecase is to gather performance statistics at the processor's level.
027     *
028     * @version $Revision: 835531 $
029     */
030    public interface InterceptStrategy {
031    
032        /**
033         * This method is invoked by
034         * {@link ProcessorDefinition#wrapProcessor(RouteContext, Processor)}
035         * to give the implementor an opportunity to wrap the target processor
036         * in a route.
037         *
038         * @param context       Camel context
039         * @param definition    the model this interceptor represents
040         * @param target        the processor to be wrapped
041         * @param nextTarget    the next processor to be routed to
042         * @return processor wrapped with an interceptor or not wrapped
043         * @throws Exception can be thrown
044         */
045        Processor wrapProcessorInInterceptors(CamelContext context, 
046                ProcessorDefinition<?> definition, Processor target, Processor nextTarget) throws Exception;
047    }