MappedFile关闭问题

appedFile destroy将调用ReferenceResource关闭方法， 对refCount有些困惑？

this.refCount.set（-1000 this.getRefCount（））

应替换为

this.refCount.set（-1000+this.getRefCount（））；

我认为目的是每次递减1000直到0

public abstract class ReferenceResource {

protected final AtomicLong refCount = new AtomicLong(1);
protected volatile boolean available = true;
protected volatile boolean cleanupOver = false;
private volatile long firstShutdownTimestamp = 0;

public synchronized boolean hold() {
    if (this.isAvailable()) {
        if (this.refCount.getAndIncrement() > 0) {
            return true;
        } else {
            this.refCount.getAndDecrement();
        }
    }

    return false;
}

public boolean isAvailable() {
    return this.available;
}

public void shutdown(final long intervalForcibly) {
    if (this.available) {
        this.available = false;
        this.firstShutdownTimestamp = System.currentTimeMillis();
        this.release();
    } else if (this.getRefCount() > 0) {
        if ((System.currentTimeMillis() - this.firstShutdownTimestamp) >= intervalForcibly) {
            // some confusion here
            this.refCount.set(-1000 - this.getRefCount());
            this.release();
        }
    }
}

原提问者GitHub用户lebron374