ReentrantCheck.java

package codechicken.core;

public class ReentrantCheck {
    private boolean entered;

    public ReentrantCheck() {
        entered = false;
    }

    public boolean entered() {
        return entered;
    }

    public void enter() {
        entered = true;
    }

    public void exit() {
        entered = false;
    }

    public static ThreadLocal<ReentrantCheck> threadLocal() {
        return new ThreadLocal<ReentrantCheck>() {
            @Override
            protected ReentrantCheck initialValue() {
                return new ReentrantCheck();
            }
        };
    }
}