/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.management;
import java.util.Map;
import org.apache.camel.CamelContext;
import org.apache.camel.Processor;
import org.apache.camel.api.management.PerformanceCounter;
import org.apache.camel.management.mbean.ManagedPerformanceCounter;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.spi.InterceptStrategy;
import org.apache.camel.util.KeyValueHolder;
/**
* This strategy class wraps targeted processors with a
* {@link InstrumentationProcessor}. Each InstrumentationProcessor has an
* embedded {@link ManagedPerformanceCounter} for monitoring performance metrics.
* <p/>
* This class looks up a map to determine which PerformanceCounter should go into the
* InstrumentationProcessor for any particular target processor.
*
* @version
*/
public class InstrumentationInterceptStrategy implements InterceptStrategy {
private Map<ProcessorDefinition<?>, PerformanceCounter> registeredCounters;
private final Map<Processor, KeyValueHolder<ProcessorDefinition<?>, InstrumentationProcessor>> wrappedProcessors;
public InstrumentationInterceptStrategy(Map<ProcessorDefinition<?>, PerformanceCounter> registeredCounters,
Map<Processor, KeyValueHolder<ProcessorDefinition<?>, InstrumentationProcessor>> wrappedProcessors) {
this.registeredCounters = registeredCounters;
this.wrappedProcessors = wrappedProcessors;
}
public Processor wrapProcessorInInterceptors(CamelContext context, ProcessorDefinition<?> definition,
Processor target, Processor nextTarget) throws Exception {
// do not double wrap it
if (target instanceof InstrumentationProcessor) {
return target;
}
// only wrap a performance counter if we have it registered in JMX by the jmx agent
PerformanceCounter counter = registeredCounters.get(definition);
if (counter != null) {
InstrumentationProcessor wrapper = new InstrumentationProcessor(counter);
wrapper.setProcessor(target);
wrapper.setType(definition.getShortName());
// add it to the mapping of wrappers so we can later change it to a decorated counter
// that when we register the processor
KeyValueHolder<ProcessorDefinition<?>, InstrumentationProcessor> holder =
new KeyValueHolder<ProcessorDefinition<?>, InstrumentationProcessor>(definition, wrapper);
wrappedProcessors.put(target, holder);
return wrapper;
}
return target;
}
@Override
public String toString() {
return "InstrumentProcessor";
}
}