urweb/src/main/java/at/acdp/urweb/sclient/URLog.java

package at.acdp.urweb.sclient;

import at.acdp.urweb.sclient.data.IJsonObject;
import at.acdp.urweb.sclient.data.LogHolder;

public class URLog {
    private final static int LENGTH=100;
    private static LogHolder[] list=new LogHolder[LENGTH];
    private static int pos=0;

    public static void add(IJsonObject jo) {
        synchronized (list) {
            String type=jo.getClass().getSimpleName();
            list[++pos%LENGTH]=new LogHolder(type, jo);;
        }
    }

    public static LogEntries get(int from) {
        from%=LENGTH;
        int to=pos%LENGTH;
        synchronized (list){
            int length=to-from;
            if(from > to) {
                var ret=new LogHolder[LENGTH-from+to];
                System.arraycopy(list, from, ret,0,LENGTH-from);
                System.arraycopy(list, 0, ret,LENGTH-from,to);
                return new LogEntries(ret, pos);
            }
            else {
                var ret=new LogHolder[length];
                System.arraycopy(list, from, ret,0,length);
                return new LogEntries(ret, pos);
            }
        }
    }
}