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a plugin for performance testing
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/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.plugins.perftest;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.util.ValidationEventCollector;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.rhq.plugins.perftest.calltime.CalltimeFactory;
import org.rhq.plugins.perftest.calltime.ConfigurableCallTimeDataFactory;
import org.rhq.plugins.perftest.calltime.EmptyCalltimeFactory;
import org.rhq.plugins.perftest.calltime.SimpleCallTimeDataFactory;
import org.rhq.plugins.perftest.configuration.ConfigurationFactory;
import org.rhq.plugins.perftest.configuration.SimpleConfigurationFactory;
import org.rhq.plugins.perftest.content.ContentFactory;
import org.rhq.plugins.perftest.content.SimpleContentFactory;
import org.rhq.plugins.perftest.measurement.EmptyMeasurementFactory;
import org.rhq.plugins.perftest.measurement.MeasurementFactory;
import org.rhq.plugins.perftest.measurement.OOBNumericMeasurementFactory;
import org.rhq.plugins.perftest.measurement.SimpleNumericMeasurementFactory;
import org.rhq.plugins.perftest.resource.EmptyResourceFactory;
import org.rhq.plugins.perftest.resource.ResourceFactory;
import org.rhq.plugins.perftest.resource.SimpleResourceFactory;
import org.rhq.plugins.perftest.scenario.CalltimeGenerator;
import org.rhq.plugins.perftest.scenario.ConfigurableCallTimeDataGenerator;
import org.rhq.plugins.perftest.scenario.ConfigurationGenerator;
import org.rhq.plugins.perftest.scenario.ContentGenerator;
import org.rhq.plugins.perftest.scenario.MeasurementGenerator;
import org.rhq.plugins.perftest.scenario.OOBNumericMeasurementGenerator;
import org.rhq.plugins.perftest.scenario.Resource;
import org.rhq.plugins.perftest.scenario.ResourceGenerator;
import org.rhq.plugins.perftest.scenario.Scenario;
import org.rhq.plugins.perftest.scenario.SimpleCallTimeDataGenerator;
import org.rhq.plugins.perftest.scenario.SimpleConfigurationGenerator;
import org.rhq.plugins.perftest.scenario.SimpleContentGenerator;
import org.rhq.plugins.perftest.scenario.SimpleNumericMeasurementGenerator;
import org.rhq.plugins.perftest.scenario.SimpleResourceGenerator;
import org.rhq.plugins.perftest.scenario.SimpleTraitMeasurementGenerator;
import org.rhq.plugins.perftest.scenario.TraitGenerator;
import org.rhq.plugins.perftest.trait.EmptyTraitFactory;
import org.rhq.plugins.perftest.trait.SimpleTraitFactory;
import org.rhq.plugins.perftest.trait.TraitFactory;
/**
* Loads performance testing scenarios and parses into usable components by the RHQ resource components.
*
* @author Jason Dobies
*/
public class ScenarioManager {
// Constants --------------------------------------------
private static final ScenarioManager INSTANCE = new ScenarioManager();
/**
* System property that must be set to indicate what scenario to use. The value of this property should be the file
* name of the scenario, minus the ".xml". For example, to use the scenario defined in high-servers.xml, this
* property should be set to "high-servers".
*/
public static final String SCENARIO_PROPERTY = "rhq.perftest.scenario";
/**
* Resource factory used when a scenario doesn't define any resources of a particular type.
*/
private static final EmptyResourceFactory EMPTY_RESOURCE_FACTORY = new EmptyResourceFactory();
/**
* Measurement factory used when a scenario doesn't define any metrics for a particular resource type.
*/
private static final EmptyMeasurementFactory EMPTY_MEASUREMENT_FACTORY = new EmptyMeasurementFactory();
/**
* Calltime factory used when a scenario doesn't define any metrics for a particular resource type.
*/
private static final EmptyCalltimeFactory EMPTY_CALLTIME_FACTORY = new EmptyCalltimeFactory();
/**
* Trait factory used when a scenario doesn't define any metrics for a particular resource type.
*/
private static final TraitFactory EMPTY_TRAIT_FACTORY = new EmptyTraitFactory();
// Attributes --------------------------------------------
private final Log log = LogFactory.getLog(ScenarioManager.class);
/**
* JAXB representation of the loaded scenario.
*/
private Scenario scenario;
/**
* Mapping of resource type name to resource factory used in discovery.
*/
private Map resourceFactories = new HashMap();
/**
* Mapping of resource type name to measurement factory to field all of its configured measurements. If we
* eventually want to be able to configure the value for each metric on a resource type, this will need to be
* changed.
*/
private Map measurementFactories = new HashMap();
private Map calltimeFactories = new HashMap();
private Map traitFactories = new HashMap();
/**
* Mapping of resource type name to configuration factory to populate the plugin configuration for newly discovered
* resources. If we eventually want to customize the plugin configuration for each resource of this type, this will
* need to be changed.
*/
private Map pluginConfigurationFactories = new HashMap();
/**
* Mapping of package type name to content factory to field requests to discover content. This implementation has
* the limitation that each type in the plugin descriptor has a unique name.
*/
private Map contentFactories = new HashMap();
// Constructors --------------------------------------------
/**
* Singleton constructor.
*/
private ScenarioManager() {
loadScenario();
}
// Public --------------------------------------------
/**
* Returns an instance of this class.
*
* @return instance of this class
*/
public static ScenarioManager getInstance() {
return INSTANCE;
}
public boolean isEnabled() {
return this.scenario != null;
}
/**
* Returns the resource factory defined in the scenario for the specified resource type.
*
* @param resourceTypeName indicates which resource factory to return
*
* @return resource factory instance to use to generate the discovery for resources of this type; this will never be
* null.
*/
public ResourceFactory getResourceFactory(String resourceTypeName) {
ResourceFactory resourceFactory = resourceFactories.get(resourceTypeName);
// Lazy load the factory
if (resourceFactory == null) {
Resource resource = findResource(resourceTypeName);
if (resource == null) {
resourceFactory = EMPTY_RESOURCE_FACTORY;
} else {
ResourceGenerator generator = resource.getResourceGenerator().getValue();
resourceFactory = createResourceFactory(generator);
}
resourceFactories.put(resourceTypeName, resourceFactory);
}
return resourceFactory;
}
/**
* Returns the measurement factory defined in the scenario for the specified resource type.
*
* @param resourceTypeName indicates the resource for which we're retrieving metrics
*
* @return measurement factory instance used to generate measurement values; this will never be null.
*/
public MeasurementFactory getMeasurementFactory(String resourceTypeName) {
MeasurementFactory measurementFactory = measurementFactories.get(resourceTypeName);
// Lazy load the factory
if (measurementFactory == null) {
Resource resource = findResource(resourceTypeName);
if (resource == null) {
measurementFactory = EMPTY_MEASUREMENT_FACTORY;
} else {
JAXBElement element = resource.getMeasurementGenerator();
if (element == null) {
measurementFactory = EMPTY_MEASUREMENT_FACTORY;
} else {
MeasurementGenerator generator = element.getValue();
measurementFactory = createMeasurementFactory(generator);
}
}
measurementFactories.put(resourceTypeName, measurementFactory);
}
return measurementFactory;
}
public CalltimeFactory getCalltimeFactory(String resourceTypeName) {
CalltimeFactory calltimeFactory= calltimeFactories.get(resourceTypeName);
if (calltimeFactory == null ) {
Resource resource = findResource(resourceTypeName);
if (resource == null) {
calltimeFactory = EMPTY_CALLTIME_FACTORY;
} else {
JAXBElement element = resource.getCalltimeGenerator();
if (element == null) {
calltimeFactory = EMPTY_CALLTIME_FACTORY;
} else {
CalltimeGenerator generator = element.getValue();
calltimeFactory = createCalltimeFactory(generator);
}
}
calltimeFactories.put(resourceTypeName, calltimeFactory);
}
return calltimeFactory;
}
public TraitFactory getTraitFactory(String resourceTypeName) {
TraitFactory traitFactory = traitFactories.get(resourceTypeName);
if (traitFactory == null) {
Resource resource = findResource(resourceTypeName);
if (resource == null) {
traitFactory = EMPTY_TRAIT_FACTORY;
} else {
JAXBElement element = resource.getTraitGenerator();
if (element == null) {
traitFactory = EMPTY_TRAIT_FACTORY;
} else {
TraitGenerator generator = element.getValue();
traitFactory = createTraitFactory(generator);
}
}
traitFactories.put(resourceTypeName,traitFactory);
}
return traitFactory;
}
/**
* Returns the configuration factory defined in the scenario for creating plugin configurations for the specified
* resource type.
*
* @param resourceTypeName indicates the resource for which we're retriving the plugin configuration
*
* @return configuration factory instance used to generate the plugin configurations; this may be null
* if the resource does not define a generator for its plugin configuration
*/
public ConfigurationFactory getPluginConfigurationFactory(String resourceTypeName) {
ConfigurationFactory configurationFactory = pluginConfigurationFactories.get(resourceTypeName);
// Lazy load the factory
if (configurationFactory == null) {
Resource resource = findResource(resourceTypeName);
if (resource != null) {
JAXBElement element = resource.getPluginConfigurationGenerator();
if (element != null) {
ConfigurationGenerator generator = element.getValue();
configurationFactory = createConfigurationFactory(generator);
pluginConfigurationFactories.put(resourceTypeName, configurationFactory);
}
}
}
return configurationFactory;
}
/**
* Returns the content factory defined in the scenario for discovering packages of the specified type.
*
* @param resourceTypeName indicates the resource in which the type is defined
* @param packageTypeName indicated the type being discovered
*
* @return factory used for discovery; this may be null if the scenario does not define a generator for
* a particular type
*/
public ContentFactory getContentFactory(String resourceTypeName, String packageTypeName) {
ContentFactory contentFactory = contentFactories.get(packageTypeName);
// Lazy load the factory
if (contentFactory == null) {
Resource resource = findResource(resourceTypeName);
if (resource != null) {
List> elements = resource.getContentGenerator();
if (elements != null) {
for (JAXBElement element : elements) {
ContentGenerator generator = element.getValue();
if (generator.getPackageType().equals(packageTypeName)) {
contentFactory = createContentFactory(generator);
contentFactories.put(packageTypeName, contentFactory);
}
}
}
}
}
return contentFactory;
}
// Private --------------------------------------------
/**
* Creates the appropriate resource factory instance based on the provided generator.
*
* @param generator read from the scenario
*
* @return resource factory instance
*/
private ResourceFactory createResourceFactory(ResourceGenerator generator) {
if (generator instanceof SimpleResourceGenerator) {
return new SimpleResourceFactory((SimpleResourceGenerator) generator);
}
log.warn("No factory for generator " + generator.toString() + " specified");
return null;
}
/**
* Creates the appropriate measurement factory instance based on the provided generator.
*
* @param generator read from the scenario
*
* @return measurement factory instance
*/
private MeasurementFactory createMeasurementFactory(MeasurementGenerator generator) {
if (generator instanceof SimpleNumericMeasurementGenerator) {
return new SimpleNumericMeasurementFactory();
} else if (generator instanceof OOBNumericMeasurementGenerator) {
return new OOBNumericMeasurementFactory();
}
return null;
}
/**
* Creates the appropriate calltime factory instance based on the provided generator.
*
* @param generator read from the scenario
*
* @return calltime factory instance
*/
private CalltimeFactory createCalltimeFactory(CalltimeGenerator generator) {
if (generator instanceof SimpleCallTimeDataGenerator) {
return new SimpleCallTimeDataFactory();
} else if (generator instanceof ConfigurableCallTimeDataGenerator) {
return new ConfigurableCallTimeDataFactory((ConfigurableCallTimeDataGenerator)generator);
}
return null;
}
/**
* Creates an appropriate Traits factory based on the provided generator.
* @param generator read from the scenario
* @return TraitFactory instance
*/
private TraitFactory createTraitFactory(TraitGenerator generator) {
if (generator instanceof SimpleTraitMeasurementGenerator) {
return new SimpleTraitFactory();
}
return null;
}
/**
* Creates the appropriate configuration factory instance based on the provided generator.
*
* @param generator read from the scenario
*
* @return configuration factory instance
*/
private ConfigurationFactory createConfigurationFactory(ConfigurationGenerator generator) {
if (generator instanceof SimpleConfigurationGenerator) {
return new SimpleConfigurationFactory();
}
return null;
}
/**
* Creates the appropriate content factory instance based on the provided generator.
*
* @param generator read from the scenario
*
* @return factory instance
*/
private ContentFactory createContentFactory(ContentGenerator generator) {
if (generator instanceof SimpleContentGenerator) {
SimpleContentGenerator simpleGenerator = (SimpleContentGenerator) generator;
return new SimpleContentFactory(simpleGenerator);
}
return null;
}
/**
* Searches through the scenario for the resource type indicated.
*
* @param resourceType being loaded from the scenario
*
* @return scenario resource object describing how to generate resources of this type
*/
private Resource findResource(String resourceType) {
List allResources = scenario.getResource();
for (Resource resource : allResources) {
if (resource.getType().equals(resourceType)) {
return resource;
}
}
return null;
}
/**
* Determines what scenario to load and loads the JAXB objects representing the scenario.
*/
private void loadScenario() {
// Determine scenario
String scenarioName = System.getProperty(SCENARIO_PROPERTY);
if (scenarioName == null) {
log.info("Cannot find scenario name. Make sure the system property " + SCENARIO_PROPERTY + " is set.");
return;
}
log.info("Loading Performance Testing Scenario [" + scenarioName + "]...");
ClassLoader loader = this.getClass().getClassLoader();
URL scenarioUrl = loader.getResource(scenarioName + ".xml");
// Load the JAXB stuff
Class objectFactoryClass = null;
try {
objectFactoryClass = loader.loadClass("org.rhq.plugins.perftest.scenario.ObjectFactory");
} catch (ClassNotFoundException e) {
log.error("Error finding class ObjectFactory", e);
return;
}
JAXBContext jaxbContext;
try {
jaxbContext = JAXBContext.newInstance(objectFactoryClass);
} catch (JAXBException e) {
log.error("Could not instantiate JAXB context", e);
return;
}
// Load the scenario
try {
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
ValidationEventCollector vec = new ValidationEventCollector();
unmarshaller.setEventHandler(vec);
this.scenario = (Scenario) unmarshaller.unmarshal(scenarioUrl);
} catch (JAXBException e) {
log.error("Scenario [" + scenarioName + "] could not be loaded from [" + scenarioUrl + "]." , e);
return;
}
}
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