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package com.sun.grizzly.util;
import java.util.Queue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Level;
/**
*
* @author gustav trede
*/
public class DataStructures {
private final static Class<?> LTQclass, CLQclass;
static{
Class<?> LTQ = LinkedBlockingQueue.class ,
CLQ = LinkedBlockingQueue.class;
int jver = 0;
try{
jver = Integer.valueOf(System.getProperty("java.version").
substring(0,3).replace(".", ""));
if (jver > 16){
CLQ = ConcurrentLinkedQueue.class;
LTQ = getAndVerify("maskedclasses.LinkedTransferQueue");
}else
if (jver == 16){
LTQ = getAndVerify("maskedclasses.LinkedTransferQueue");
CLQ = getAndVerify("maskedclasses.ConcurrentLinkedQueue");
}
}catch(Throwable t){
LoggerUtils.getLogger().log(Level.FINE,
"failed loading grizzly version of datastructure classes," +
" dont worry we load other classes instead.", t);
}
LTQclass = LTQ;
CLQclass = CLQ;
LoggerUtils.getLogger().fine("JVM version "+jver+" detected," +
" grizzly loaded datastructure classes: "+LTQclass+" "+CLQclass);
}
private final static Class<?> getAndVerify(String cname) throws Throwable{
Class<?> cl = DataStructures.class.getClassLoader().loadClass(cname);
return cl.newInstance().getClass();
}
public final static BlockingQueue<?> getLTQinstance(){
try{
return (BlockingQueue<?>) LTQclass.newInstance();
}catch(Exception ea){
throw new RuntimeException(ea);
}
}
@SuppressWarnings("unchecked")
public final static <T>BlockingQueue<T> getLTQinstance(Class<T> t){
try{
return (BlockingQueue<T>) LTQclass.newInstance();
}catch(Exception ea){
throw new RuntimeException(ea);
}
}
public final static Queue<?> getCLQinstance(){
try{
return (Queue<?>) CLQclass.newInstance();
}catch(Exception ea){
throw new RuntimeException(ea);
}
}
@SuppressWarnings("unchecked")
public final static <T>Queue<T> getCLQinstance(Class<T> t){
try{
return (Queue<T>) CLQclass.newInstance();
}catch(Exception ea){
throw new RuntimeException(ea);
}
}
}