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package org.glassfish.flashlight.impl.core;
import java.util.*;
import java.util.concurrent.*;
import org.glassfish.flashlight.FlashlightUtils;
/**
* @author Mahesh Kannan
* @author Byron Nevins
* Date: Jun 25, 2008
*
* Byron Nevins says: Note this class is used in one and only one place in all of
* GF --> FlashlightProbeProviderFactory.java
* Apparently it is used exclusively for making sure that 2 probes with the same name are not allowed?!?
* look at the putIfAbsent for clues
* This class has no business having any public members and should be moved to the only user's package
*
* I'm suspicious. Maybe it is called by reflection from somewhere?!?
*/
public class ProbeProviderRegistry {
private ProbeProviderRegistry() {
}
public static ProbeProviderRegistry getInstance() {
return _me;
}
public static void cleanup() {
_me = new ProbeProviderRegistry();
}
public Collection<FlashlightProbeProvider> getAllProbeProviders() {
return Collections.unmodifiableCollection(providerMap.values());
}
public FlashlightProbeProvider getProbeProvider(String moduleProviderName, String moduleName, String probeProviderName) {
if(probeProviderName == null)
probeProviderName = "";
return providerMap.get(FlashlightUtils.makeName(moduleProviderName, moduleName, probeProviderName));
}
public FlashlightProbeProvider getProbeProvider(Class clz) {
return classProviderMap.get(clz);
}
public FlashlightProbeProvider getProbeProvider(FlashlightProbeProvider fpp) {
return providerMap.get(FlashlightUtils.makeName(fpp));
}
public FlashlightProbeProvider registerProbeProvider(FlashlightProbeProvider provider, Class clz) {
String qname = FlashlightUtils.makeName(provider);
// if there is an entry in the map for qname already -- it is an error
// ConcurrentMap allows us to check and put with thread-safety!
// putIfAbsent returns null iff there was no value already in there.
if (providerMap.putIfAbsent(qname, provider) != null) {
throw new IllegalStateException("Provider already mapped " + qname);
}
if (classProviderMap.putIfAbsent(clz, provider) != null) {
throw new IllegalStateException("Provider already mapped " + qname);
}
return provider;
}
public void unregisterProbeProvider(Object provider) {
FlashlightProbeProvider fpp = classProviderMap.remove(provider.getClass());
String qname = FlashlightUtils.makeName(fpp);
providerMap.remove(qname);
}
private static ProbeProviderRegistry _me =
new ProbeProviderRegistry();
private ConcurrentMap<String, FlashlightProbeProvider> providerMap =
new ConcurrentHashMap<String, FlashlightProbeProvider>();
private ConcurrentMap<Class, FlashlightProbeProvider> classProviderMap =
new ConcurrentHashMap<Class, FlashlightProbeProvider>();
}