Glassfish example source code file (FlashlightProbeProviderFactory.java)

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Java - Glassfish tags/keywords

class, class, classnotfoundexception, exception, flashlightprobe, flashlightprobeprovider, flashlightprobeprovider, illegalaccessexception, instantiationexception, io, log, logging, override, reflection, string, string, t, t, text, util

The Glassfish FlashlightProbeProviderFactory.java source code

/*
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 *
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 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
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 */

package org.glassfish.flashlight.impl.provider;

import org.glassfish.external.probe.provider.annotations.*;
import org.glassfish.flashlight.xml.ProbeProviderStaxParser;
import com.sun.enterprise.config.serverbeans.MonitoringService;
import com.sun.enterprise.util.ObjectAnalyzer;
import com.sun.enterprise.util.LocalStringManagerImpl;
import com.sun.logging.LogDomains;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.*;
import org.glassfish.api.monitoring.DTraceContract;
import org.glassfish.flashlight.FlashlightUtils;
import org.glassfish.flashlight.impl.client.FlashlightProbeClientMediator;
import org.glassfish.flashlight.provider.*;
import org.glassfish.flashlight.impl.core.*;
import org.glassfish.flashlight.provider.ProbeProviderFactory;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.glassfish.external.probe.provider.annotations.*;

import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.text.MessageFormat;

import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.PostConstruct;

/**
 * @author Mahesh Kannan
 * @author Byron Nevins
 * @author Prashanth Abbagani
 */
@Service
public class FlashlightProbeProviderFactory
        implements ProbeProviderFactory, PostConstruct {
    @Inject
    MonitoringService monitoringServiceConfig;

    @Inject
    ProbeProviderEventManager ppem;
    
    @Inject
    Habitat habitat;

    private List<ProbeProviderEventListener> listeners = new ArrayList();

    private final static Set<FlashlightProbeProvider> allProbeProviders = new HashSet();
    private static final Logger logger =
        LogDomains.getLogger(FlashlightProbeProviderFactory.class, LogDomains.MONITORING_LOGGER);
    private static final ResourceBundle rb = logger.getResourceBundle();

    private final HashMap<String, Class> primTypes = new HashMap() {
        {
            put("int",Integer.TYPE);
            put("byte",Byte.TYPE);
            put("char",Character.TYPE);
            put("short",Short.TYPE);
            put("long",Long.TYPE);
            put("float",Float.TYPE);
            put("double",Double.TYPE);
            put("boolean",Boolean.TYPE);
            put("void",Void.TYPE);
        }
    };

    public void postConstruct() {
        FlashlightUtils.initialize(habitat, monitoringServiceConfig);
    }

    public void dtraceEnabledChanged(boolean newValue) {
        FlashlightUtils.setDTraceEnabled(newValue);

        // if true->false we just need to set the enabled flag
        // DTrace invoker will simply not call the already-built
        // DTrace objects

        if(newValue == false)
            return;
        
        // if it still is not available -- return.  E.g. they set the flag
        // but they don't have the native libs
        
        if(!FlashlightUtils.isDtraceAvailable())
            return;
        
        // if false-> true we might need to create all the DTrace classes.  It 
        // depends on whether the server started up with it true, etc.
        // loop through all the Providers -- if any don't have DTrace then
        // instrument with DTrace
        Collection<FlashlightProbeProvider> pps = ProbeProviderRegistry.getInstance().getAllProbeProviders();

        for(FlashlightProbeProvider pp : pps) {
            if(!pp.isDTraceInstrumented()) {
                handleDTrace(pp);
            }
        }
    }

    public void monitoringEnabledChanged(boolean newValue) {
        FlashlightUtils.setMonitoringEnabled(newValue);

        // if monitoring-enabled is going false -> true AND
        // dtrace-enabled is true -- then we need to do something
        // o/w we don't have to do anything

        if(newValue == true && FlashlightUtils.isDtraceEnabled())
            dtraceEnabledChanged(true);
    }
    
    public <T> T getProbeProvider(Class providerClazz)
            throws InstantiationException, IllegalAccessException {
        return getProbeProvider(providerClazz, null);
    }

    public <T> T getProbeProvider(Class providerClazz, String invokerId)
            throws InstantiationException, IllegalAccessException {
        //TODO: check for null and generate default names
        ProbeProvider provAnn = providerClazz.getAnnotation(ProbeProvider.class);

        String moduleProviderName = provAnn.moduleProviderName();
        String moduleName = provAnn.moduleName();
        String probeProviderName = provAnn.probeProviderName();

        if (isValidString(moduleProviderName) && 
            isValidString(moduleName) && 
            isValidString(probeProviderName)) {
            return getProbeProvider(moduleProviderName, moduleName,
                                probeProviderName,
                                invokerId, providerClazz);
        } else {
            logger.log(Level.WARNING,
                       "invalidProbeProvider", new Object[] {providerClazz.getName()});
            return null;
        }
    }

    public <T> T getProbeProvider(String moduleName, String providerName, String appName,
                                  Class<T> clazz)
            throws InstantiationException, IllegalAccessException {

        return getProbeProvider(moduleName, providerName, appName, null, clazz);
    }

    public <T> T getProbeProvider(String moduleProviderName, String moduleName,
    		String probeProviderName, String invokerId,
    		Class<T> providerClazz)
            throws InstantiationException, IllegalAccessException {

        String origProbeProviderName = probeProviderName;
        Class<T> oldProviderClazz = providerClazz;

        ProbeProviderRegistry ppRegistry = ProbeProviderRegistry.getInstance();
        FlashlightProbeProvider genericProvider = null;
        if (invokerId != null) {
            getProbeProvider( moduleProviderName,  moduleName,
    		 probeProviderName, null, providerClazz);
            genericProvider = new FlashlightProbeProvider(
                moduleProviderName, moduleName, probeProviderName, providerClazz);
            genericProvider = ppRegistry.getProbeProvider(genericProvider);

            invokerId = FlashlightUtils.getUniqueInvokerId(invokerId);
            probeProviderName += invokerId;
            try {
                providerClazz = getGeneratedProbeProviderClass(oldProviderClazz, invokerId);

            } catch (Exception ex) {
                //TODO
                providerClazz = oldProviderClazz;
            }
        }
        FlashlightProbeProvider provider = new FlashlightProbeProvider(
                moduleProviderName, moduleName, probeProviderName, providerClazz);
        if (logger.isLoggable(Level.FINE)) {
            logger.fine("ModuleProviderName= " + moduleProviderName + " \tModule= " + moduleName
                + "\tProbeProviderName= " + probeProviderName + "\tProviderClazz= " + providerClazz.toString());
        }

        // IT 10269 -- silently return a fresh instance if it is already registered
        // don't waste time -- return right away...
        
        FlashlightProbeProvider alreadyExists = ppRegistry.getProbeProvider(provider);

        if(alreadyExists != null) {
            T inst = (T) alreadyExists.getProviderClass().newInstance();
            notifyListenersOnAdd(moduleProviderName, moduleName,
                    probeProviderName, invokerId, providerClazz, inst);
            return inst;
        }

        List<Method> methods = FlashlightUtils.getProbeMethods(providerClazz);
        
        for (Method m : methods) {
            int sz = m.getParameterTypes().length;
            Probe pnameAnn = m.getAnnotation(Probe.class);
            //todo throw a fatal error - quit struggling on!!!!
            String probeName = (pnameAnn != null)
                    ? pnameAnn.name() : m.getName();
            boolean self = (pnameAnn != null) ? pnameAnn.self() : false;
            boolean hidden = (pnameAnn != null) ? pnameAnn.hidden() : false;
            String[] probeParamNames = FlashlightUtils.getParamNames(m);
            FlashlightProbe probe = ProbeFactory.createProbe(
                    providerClazz, moduleProviderName, moduleName, probeProviderName, probeName,
                    probeParamNames, m.getParameterTypes(), self, hidden);
            probe.setProviderJavaMethodName(m.getName());
            provider.addProbe(probe);

            if (invokerId != null) {
                if (genericProvider != null) {
                    String probeDescriptor = FlashlightProbe.getProbeDesc(moduleProviderName, moduleName, origProbeProviderName, probeName);
                    if (probeDescriptor != null) {
                        FlashlightProbe fp = genericProvider.getProbe(probeDescriptor);
                        if (fp != null) {
                             probe.setParent(fp);
                        }
                    }

                }
            }
        }

        handleDTrace(provider);

        Class<T> tClazz = providerClazz;

        int mod = providerClazz.getModifiers();
        if (Modifier.isAbstract(mod)) {

            String generatedClassName = provider.getModuleProviderName() +
                    "_Flashlight_" + provider.getModuleName() + "_" + "Probe_" +
                    ((provider.getProbeProviderName() == null) ? providerClazz.getName() : provider.getProbeProviderName());
            generatedClassName = providerClazz.getName() + "_" + generatedClassName;

            try {
                tClazz = (Class<T>) (providerClazz.getClassLoader()).loadClass(generatedClassName);
                //System.out.println ("Reusing the Generated class");
                T inst = (T) tClazz.newInstance();
                notifyListenersOnAdd(moduleProviderName, moduleName,
                        probeProviderName, invokerId, providerClazz, inst);
                return inst;
            } catch (ClassNotFoundException cnfEx) {
                //Ignore
            }

            ProviderImplGenerator gen = new ProviderImplGenerator();
            generatedClassName = gen.defineClass(provider, providerClazz);

            try {
                tClazz = (Class<T>) providerClazz.getClassLoader().loadClass(generatedClassName);
            } catch (ClassNotFoundException cnfEx) {
                throw new RuntimeException(cnfEx);
            }
        }

        ppRegistry.getInstance().registerProbeProvider(
                provider, tClazz);

        T inst = (T) tClazz.newInstance();
        notifyListenersOnAdd(moduleProviderName, moduleName,
                probeProviderName, invokerId, providerClazz, inst);
        return inst;
    }



    public void unregisterProbeProvider(Object probeProvider) {
        try {
            ProbeProviderRegistry ppRegistry = ProbeProviderRegistry.getInstance();
            FlashlightProbeProvider fProbeProvider =
                    ppRegistry.getProbeProvider(probeProvider.getClass());
            ProbeRegistry probeRegistry = ProbeRegistry.getInstance();
            for (FlashlightProbe probe : fProbeProvider.getProbes()) {
                probeRegistry.unregisterProbe(probe);
            }
            ppRegistry.unregisterProbeProvider(probeProvider);
        } catch (Throwable t) {
            if (logger.isLoggable(Level.WARNING))
                logger.log(Level.WARNING, "unregisterProbeProvider exception ", t);
        }
    }

    private <T> Class getGeneratedProbeProviderClass(Class oldProviderClazz, String invokerId) {
        String generatedClassName = oldProviderClazz.getName() + invokerId;

        Class<T> genClazz = null;

        try {
            ProviderSubClassImplGenerator gen = new ProviderSubClassImplGenerator(
                    oldProviderClazz, invokerId);

            genClazz = gen.generateAndDefineClass(oldProviderClazz, invokerId);

            //System.out.println("** Loaded generated provider: " + genClazz.getName());
            return genClazz;
        } catch (Throwable cnfEx) {
            throw new RuntimeException(cnfEx);
        }
    }

    public void processXMLProbeProviders(ClassLoader cl, String xml, boolean inBundle) {
        if (logger.isLoggable(Level.FINE))
            logger.fine("processProbeProviderXML for " + xml);
        try {
            InputStream is = cl.getResourceAsStream(xml);
            if (inBundle) {
                is = cl.getResourceAsStream(xml);
            } else {
                is = new FileInputStream(xml);
            }
            if (logger.isLoggable(Level.FINE))
                logger.fine("InputStream = " + is);
            ProbeProviderStaxParser providerXMLParser = new ProbeProviderStaxParser(is);
            List<org.glassfish.flashlight.xml.Provider> providers = providerXMLParser.getProviders();
            for (org.glassfish.flashlight.xml.Provider provider : providers) {
                if (logger.isLoggable(Level.FINE))
                    logger.fine(provider.toString());
                registerProvider(cl, provider);
            }
        } catch (Exception e) {
            String msg =
                    rb.getString("cannotProcessXMLProbeProvider");
            msg = MessageFormat.format(msg, xml);
            logger.log(Level.SEVERE, msg, e);
        }

    }

    private <T> void notifyListenersOnAdd(String moduleProviderName, String moduleName,
                String probeProviderName, String invokerId,
                Class<T> providerClazz, T provider) {
        for (ProbeProviderEventListener listener : listeners) {
            listener.probeProviderAdded(moduleProviderName, moduleName,
                probeProviderName, invokerId, providerClazz, provider);
        }
    }

    @Override
    public void addProbeProviderEventListener(ProbeProviderEventListener listener) {
        listeners.add(listener);
    }
 
    @Override
    public void removeProbeProviderEventListener(ProbeProviderEventListener listener) {
        listeners.remove(listener);
    } 

    @Override
	public String toString() {
		return ObjectAnalyzer.toString(this);
	}


    private void handleDTrace(FlashlightProbeProvider provider) {
        // bnevins:  The way this works above (getProbeProvider()) is that every
        //**method** winds up added to the probe registry with an official ID.
        // I.e. a given provider-class generates possibly many probe objects
        // DTrace has a 1:1 correspondence between provider class and dtrace class imp
        // So we loop through all the probes and add the same DTrace impl object to
        // each probe.
        // We set the DTrace Method object inside the probe just this once to avoid
        // having to discover it anew over and over and over again at runtime...

		if(allHidden(provider))
			return;  // no need to waste time if they are all hidden

        DTraceContract dt = FlashlightUtils.getDtraceEngine();

        // is DTrace available and enabled?
        if(dt == null)
            return;

        // here is a way to do the same thing but you get the intermediate interface class
        //Class dtraceProviderInterface = dt.getInterface(provider);
        //Object dtraceProviderImpl = dt.getProvider(dtraceProviderInterface);

        Object dtraceProviderImpl = dt.getProvider(provider);

        // something is wrong with the provider class
        if(dtraceProviderImpl == null) {
            provider.setDTraceInstrumented(false);
            return;
        }

        provider.setDTraceInstrumented(true);
 
         Collection<FlashlightProbe> probes = provider.getProbes();
         boolean onlyHidden = true;

         for(FlashlightProbe probe : probes) {
             // if it is hidden -- do not hook-up a DTrace "listener"

             if(!probe.isHidden()) {
                 DTraceMethodFinder mf = new DTraceMethodFinder(probe, dtraceProviderImpl);
                 probe.setDTraceMethod(mf.matchMethod());
                 probe.setDTraceProviderImpl(dtraceProviderImpl);
                 onlyHidden = false;    // we have at least one!
             }
         }

         // if there are only hidden probes -- don't register the class

         if(!onlyHidden)
            FlashlightProbeClientMediator.getInstance().registerDTraceListener(provider);
    }



    private boolean allHidden(FlashlightProbeProvider provider) {
        for(FlashlightProbe probe : provider.getProbes())
            if(!probe.isHidden())
                return false;   // at least one is not hidden

        return true;
    }


    private void registerProvider(ClassLoader cl, org.glassfish.flashlight.xml.Provider provider) {

        String moduleProviderName = provider.getModuleProviderName();
        String moduleName = provider.getModuleName();
        String probeProviderName = provider.getProbeProviderName();
        String providerClass = provider.getProbeProviderClass();
        List<org.glassfish.flashlight.xml.Probe> probes = provider.getProbes();
        Class<?> providerClazz = null;

        try {
            providerClazz = cl.loadClass(providerClass);
            if (logger.isLoggable(Level.FINE))
                logger.fine("providerClazz = " + providerClazz);
        } catch (Exception e) {
            if (logger.isLoggable(Level.FINE))
                logger.fine( " Could not load the class ( " + providerClazz +
                        " ) for the provider " + providerClass);
            e.printStackTrace();
        }
        if (logger.isLoggable(Level.FINE)) {
            logger.fine("moduleProviderName = " + moduleProviderName);
            logger.fine("moduleName = " + moduleName);
            logger.fine("probeProviderName = " + probeProviderName);
            logger.fine("probeProviderClass = " + providerClass);
        }
        FlashlightProbeProvider flProvider = new FlashlightProbeProvider(
            		moduleProviderName, moduleName, probeProviderName, providerClazz);

        for (org.glassfish.flashlight.xml.Probe probe : probes) {
            String probeName = probe.getProbeName();
            String probeMethod = probe.getProbeMethod();
            boolean hasSelf = probe.hasSelf();
            boolean isHidden = probe.isHidden();

            boolean errorParsingProbe = false;
            String[] probeParams = new String[probe.getProbeParams().size()];
            Class<?>[] paramTypes = new Class[probe.getProbeParams().size()];

            int i = 0;
            for (org.glassfish.flashlight.xml.ProbeParam param : probe.getProbeParams()) {
                probeParams[i] = param.getName();
                if (logger.isLoggable(Level.FINE))
                    logger.fine("          probeParam[" + i + "] = " + probeParams[i]);
                paramTypes[i] = getParamType(cl, param.getType());

                if (paramTypes[i] == null) {
                    // Lets not create a probe if we see a problem with the
                    // paramType resolution
                    errorParsingProbe = true;
                    logger.log(Level.SEVERE, "cannotResolveProbeParamTypesForProbe", new Object[] {probeName});
                    // stop parsing anymore probe params
                    break;
                }

                i++;
            }
            if (errorParsingProbe) {
                //reset
                errorParsingProbe = false;
                // continue for the next probe
                continue;
            }
            FlashlightProbe flProbe = ProbeFactory.createProbe( providerClazz,
                    moduleProviderName, moduleName, probeProviderName, probeName,
                    probeParams, paramTypes, hasSelf, isHidden);
            flProbe.setProviderJavaMethodName(probeMethod);
            if (logger.isLoggable(Level.FINE))
                logger.fine(" Constructed probe = " + flProbe.toString());
            flProvider.addProbe(flProbe);
        }
        if (flProvider.getProbes().size() == 0)
            return;

        handleDTrace(flProvider);
        allProbeProviders.add(flProvider);
        ProbeProviderRegistry.getInstance().registerProbeProvider(
                flProvider, providerClazz);
        if (logger.isLoggable(Level.FINE))
            logger.fine (" Provider registered successfully - " + probeProviderName);
   }


    private Class<?> getParamType(ClassLoader cl, String paramTypeStr) {
        Class<?> paramType = null;

        try {
            // Lets see if this is a primitive type
            Class primType = primTypes.get(paramTypeStr);
            if (primType != null) {
                return primType;
            }
            //Not a primitive type, lets try to load it as is
            paramType = cl.loadClass(paramTypeStr);

        } catch (ClassNotFoundException ex) {
            try {
                // Not a primitive or the actual type, maybe its one of the java.lang.* types
                // try to prepend java.lang. to the given class
                paramType = cl.loadClass("java.lang." + paramTypeStr);
            } catch (Exception e) {
                String errStr = rb.getString("cannotResolveProbeParamTypes");
                errStr = MessageFormat.format(errStr, paramTypeStr);
                logger.log(Level.SEVERE, errStr, e);
            }
        }

        if (logger.isLoggable(Level.FINE))
            logger.fine("          paramType = " + paramType);

        return paramType;

    }

    private boolean isValidString(String str) {
        if ((str != null) && (str.length() > 0)){
            return true;
        }
        return false;
    }
}