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.processor.interceptor;
018    
019    import java.util.List;
020    
021    import org.apache.camel.CamelContext;
022    import org.apache.camel.Processor;
023    import org.apache.camel.impl.DefaultCamelContext;
024    import org.apache.camel.model.ProcessorType;
025    import org.apache.camel.spi.InterceptStrategy;
026    
027    /**
028     * An interceptor strategy for tracing routes
029     *
030     * @version $Revision: 45363 $
031     */
032    public class Tracer implements InterceptStrategy {
033    
034        private TraceFormatter formatter = new TraceFormatter();
035        private boolean enabled = true;
036        /**
037         * A helper method to return the Tracer instance for a given {@link CamelContext} if one is enabled
038         *
039         * @param context the camel context the debugger is connected to
040         * @return the debugger or null if none can be found
041         */
042        public static Tracer getTracer(CamelContext context) {
043            if (context instanceof DefaultCamelContext) {
044                DefaultCamelContext defaultCamelContext = (DefaultCamelContext) context;
045                List<InterceptStrategy> list = defaultCamelContext.getInterceptStrategies();
046                for (InterceptStrategy interceptStrategy : list) {
047                    if (interceptStrategy instanceof Tracer) {
048                        return (Tracer)interceptStrategy;
049                    }
050                }
051            }
052            return null;
053        }
054    
055        public Processor wrapProcessorInInterceptors(ProcessorType processorType, Processor target) throws Exception {
056            // Force the creation of an id, otherwise the id is not available when the trace formatter is
057            // outputting trace information
058            String id = processorType.idOrCreate();
059            return new TraceInterceptor(processorType, target, this);
060        }
061    
062        public TraceFormatter getFormatter() {
063            return formatter;
064        }
065    
066        public void setFormatter(TraceFormatter formatter) {
067            this.formatter = formatter;
068        }
069    
070        public void setEnabled(boolean flag) {
071            enabled = flag;
072        }
073    
074        public boolean isEnabled() {
075            return enabled;
076        }
077    }