package com.boydti.fawe.util;

import java.util.concurrent.atomic.AtomicBoolean;

import com.boydti.fawe.config.Settings;

public class MemUtil {
    
    private static AtomicBoolean memory = new AtomicBoolean(false);
    
    public static boolean isMemoryFree() {
        return !memory.get();
    }
    
    public static boolean isMemoryLimited() {
        return memory.get();
    }
    
    public static int calculateMemory() {
        final long heapSize = Runtime.getRuntime().totalMemory();
        final long heapMaxSize = Runtime.getRuntime().maxMemory();
        if (heapSize < heapMaxSize) {
            return Integer.MAX_VALUE;
        }
        final long heapFreeSize = Runtime.getRuntime().freeMemory();
        final int size = (int) ((heapFreeSize * 100) / heapMaxSize);
        if (size > (100 - Settings.MEM_FREE)) {
            memoryPlentifulTask();
            return Integer.MAX_VALUE;
        }
        return size;
    }
    
    public static void memoryLimitedTask() {
        memory.set(true);
    }
    
    public static void memoryPlentifulTask() {
        memory.set(false);
    }
}