Capture signals from Java

CustomSignalHandler.java

package io.compgen.ngsutils.support;

import sun.misc.Signal;
import sun.misc.SignalHandler;

abstract public class CustomSignalHandler implements SignalHandler {

	private SignalHandler old = null;
	
	private void setOld(SignalHandler old) {
		this.old = old;
	}
	
	public static void install(String sig, CustomSignalHandler handler) {
		Signal SIG = new Signal(sig);
		
		SignalHandler old = Signal.handle(SIG, handler);
		handler.setOld(old);
	}
	
	@Override
	public void handle(Signal sig) {
		run();
		if (old != null) {
			old.handle(sig);
		}
	}
	
	abstract public void run();

}