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/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
 *
 * 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.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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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 BlockingQueue  getLTQinstance(Class t){
        try{
            return  (BlockingQueue) 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 Queue getCLQinstance(Class t){
        try{
            return (Queue) CLQclass.newInstance();
        }catch(Exception ea){
            throw new RuntimeException(ea);
        }
    }

}