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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
PerformanceMonitorFactory.java | 75% | 83.3% | 100% | 84.1% |
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// Copyright 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.hivemind.management.impl;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Set;
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import javax.management.JMException;
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import javax.management.ObjectName;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.InterceptorStack;
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import org.apache.hivemind.ServiceInterceptorFactory;
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import org.apache.hivemind.internal.Module;
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import org.apache.hivemind.internal.ServicePoint;
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import org.apache.hivemind.management.MBeanRegistry;
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import org.apache.hivemind.management.ManagementMessages;
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import org.apache.hivemind.management.ObjectNameBuilder;
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import org.apache.hivemind.management.mbeans.PerformanceMonitorMBean;
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import org.apache.hivemind.methodmatch.MethodMatcher;
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import org.apache.hivemind.service.MethodContribution;
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import org.apache.hivemind.service.MethodIterator;
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import org.apache.hivemind.service.MethodSignature;
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/**
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* Interceptor factory that adds a MBean based performance monitor to a service. The interceptor
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* collects the number of calls, and the duration for each intercepted method. The results are
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* delegated to an {@link org.apache.hivemind.management.mbeans.PerformanceMonitorMBean MBean }that
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* is created and registered in the MBeanServer. Which methods are intercepted can be defined like
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* in the logging interceptor
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*
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* @author Achim Huegen
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* @since 1.1
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*/
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public class PerformanceMonitorFactory implements ServiceInterceptorFactory |
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{ |
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private static final String SERVICE_DECORATOR_TYPE = "PerformanceCollector"; |
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private MBeanRegistry _mbeanRegistry;
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private ObjectNameBuilder _objectNameBuilder;
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private String _serviceId;
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public PerformanceMonitorFactory(MBeanRegistry mbeanRegistry,
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ObjectNameBuilder objectNameBuilder) |
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{ |
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_mbeanRegistry = mbeanRegistry; |
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_objectNameBuilder = objectNameBuilder; |
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} |
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public void setServiceId(String string) |
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{ |
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_serviceId = string; |
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} |
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/**
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* Dynamic Proxy that counts method calls
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*/
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private class PerformanceMonitorHandler implements InvocationHandler |
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{ |
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private Object _inner;
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private PerformanceCollector _counter;
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private Set _interceptedMethods;
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PerformanceMonitorHandler(Object inner, PerformanceCollector counter, Set interceptedMethods) |
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{ |
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_inner = inner; |
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_counter = counter; |
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_interceptedMethods = interceptedMethods; |
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} |
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable |
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{ |
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try
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{ |
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// Filter the method
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MethodSignature signature = new MethodSignature(method);
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if (_interceptedMethods.contains(signature))
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{ |
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// clock the execution time
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long startTime = System.currentTimeMillis();
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Object result = method.invoke(_inner, args); |
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long endTime = System.currentTimeMillis();
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_counter.addMeasurement(signature, endTime - startTime); |
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return result;
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} |
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else
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return method.invoke(_inner, args);
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} |
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catch (InvocationTargetException ex)
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{ |
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throw ex.getTargetException();
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} |
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} |
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} |
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public void createInterceptor(InterceptorStack stack, Module invokingModule, List parameters) |
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{ |
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ServicePoint servicePoint = invokingModule.getServicePoint(stack |
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.getServiceExtensionPointId()); |
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Set methods = getInterceptedMethods(stack, parameters); |
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try
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{ |
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PerformanceCollector counter = createMBean(servicePoint, methods); |
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InvocationHandler countHandler = new PerformanceMonitorHandler(stack.peek(), counter,
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methods); |
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Object proxy = Proxy.newProxyInstance(invokingModule.getClassResolver() |
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.getClassLoader(), new Class[]
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{ stack.getServiceInterface() }, countHandler); |
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stack.push(proxy); |
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException(ManagementMessages |
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.errorInstantiatingPerformanceInterceptor(_serviceId, stack, ex), ex); |
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} |
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} |
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/**
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* Creates and registers the MBean that holds the performance data.
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*/
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public PerformanceCollector createMBean(ServicePoint servicePoint, Set methods)
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throws JMException
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{ |
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PerformanceCollector counter = new PerformanceMonitorMBean(methods);
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ObjectName objectName = _objectNameBuilder.createServiceDecoratorName( |
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servicePoint, |
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SERVICE_DECORATOR_TYPE); |
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_mbeanRegistry.registerMBean(counter, null, objectName);
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return counter;
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} |
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/**
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* Creates a method matcher that helps finding the intercepted methods
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*/
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private MethodMatcher buildMethodMatcher(List parameters)
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{ |
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MethodMatcher result = null;
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Iterator i = parameters.iterator(); |
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while (i.hasNext())
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{ |
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MethodContribution mc = (MethodContribution) i.next(); |
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if (result == null) |
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result = new MethodMatcher();
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result.put(mc.getMethodPattern(), mc); |
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} |
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return result;
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} |
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/**
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* Returns the methods that must be intercepted. Which methods are intercepted is controled by
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* the interceptor parameters via include and exclude mechanism
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*/
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protected Set getInterceptedMethods(InterceptorStack stack, List parameters)
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{ |
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Set methods = new HashSet();
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MethodMatcher matcher = buildMethodMatcher(parameters); |
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MethodIterator mi = new MethodIterator(stack.getServiceInterface());
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while (mi.hasNext())
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{ |
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MethodSignature sig = mi.next(); |
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if (includeMethod(matcher, sig))
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methods.add(sig); |
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} |
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return methods;
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} |
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private boolean includeMethod(MethodMatcher matcher, MethodSignature sig) |
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{ |
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if (matcher == null) |
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return true; |
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MethodContribution mc = (MethodContribution) matcher.get(sig); |
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return mc == null || mc.getInclude(); |
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} |
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} |
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