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package org.glassfish.flashlight.impl.client;
import java.lang.reflect.Method;
import java.util.*;
import java.util.logging.*;
import org.glassfish.flashlight.FlashlightUtils;
import org.glassfish.flashlight.client.ProbeClientInvoker;
import org.glassfish.flashlight.provider.FlashlightProbe;
import com.sun.enterprise.util.LocalStringManagerImpl;
import org.glassfish.flashlight.FlashlightLoggerInfo;
/**
* bnevins Aug 15, 2009
* DTraceClientInvoker is only public because an internal class is using it from a
* different package. If this were C++ we would have a "friend" relationship between
* the 2 classes. In Java we are stuck with making it public.
* Notes:
* DTrace has a fairly serious limitation. It only allows parameters that are
* integral primitives (all primitives except float and double) and java.lang.String
* So what we do is automagically convert other class objects to String via Object.toString()
* This brings in a new rub with overloaded methods. E.g. we can't tell apart these 2 methods:
* foo(Date) and foo(String)
*
* TODO:I believe we should disallow such overloads when the DTrace object is being produced rather than
* worrying about it in this class.
*
* @author bnevins
*/
public class DTraceClientInvoker implements ProbeClientInvoker{
private static final Logger logger = FlashlightLoggerInfo.getLogger();
public DTraceClientInvoker(int ID, FlashlightProbe p) {
id = ID;
method = p.getDTraceMethod();
targetObj = p.getDTraceProviderImpl();
}
public void invoke(Object[] args) {
if(FlashlightUtils.isDtraceAvailable()) {
try {
method.invoke(targetObj, fixArgs(args));
}
catch(Exception e) {
logger.log(Level.WARNING, FlashlightLoggerInfo.DTRACE_UNEXPECTED_EXCEPTION, e.getMessage());
}
}
}
public int getId() {
return id;
}
private Object[] fixArgs(Object[] args) {
// Logic: DTrace only allows integral primitives and java.lang.String.
// convert anything else to String.
// be careful to not unbox!!
// Very important to send back a COPY -- other listeners are sharing these args!!
Object[] fixedArgs = new Object[args.length];
for(int i = 0; i < args.length; i++) {
if(args[i] == null) {
fixedArgs[i] = null;
continue;
}
Class clazz = args[i].getClass();
if(!FlashlightUtils.isLegalDtraceParam(clazz))
fixedArgs[i] = args[i].toString();
else
fixedArgs[i] = args[i];
}
return fixedArgs;
}
private final int id;
private final Method method;
private final Object targetObj;
}
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