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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().log(Level.FINE, "JVM version {0} detected,"
                + " grizzly loaded datastructure classes: " + "{1} {2}",
                new Object[]{jver, LTQclass, CLQclass});
    }

    private static Class getAndVerify(String cname) throws Throwable {
        Class cl = DataStructures.class.getClassLoader().loadClass(cname);
        return cl.newInstance().getClass();
    }

    public static BlockingQueue getLTQinstance() {
        try {
            return (BlockingQueue) LTQclass.newInstance();
        } catch (Exception ea) {
            throw new RuntimeException(ea);
        }
    }

    @SuppressWarnings("unchecked")
    public static  BlockingQueue getLTQinstance(Class t) {
        try {
            return (BlockingQueue) LTQclass.newInstance();
        } catch (Exception ea) {
            throw new RuntimeException(ea);
        }
    }

    public static Queue getCLQinstance() {
        try {
            return (Queue) CLQclass.newInstance();
        } catch (Exception ea) {
            throw new RuntimeException(ea);
        }
    }

    @SuppressWarnings("unchecked")
    public static  Queue getCLQinstance(Class t) {
        try {
            return (Queue) CLQclass.newInstance();
        } catch (Exception ea) {
            throw new RuntimeException(ea);
        }
    }
}