Edit C:\Program Files\Java\jdk1.8.0_121\javafx\beans\value\ObservableValueBase.java

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javafx.beans.value;

import java.util.ArrayList;
import java.util.List;

import com.sun.javafx.binding.ExpressionHelper;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;

/**
 * A convenience class for creating implementations of {@link ObservableValue}.
 * It contains all of the infrastructure support for value invalidation- and
 * change event notification.
 *
 * This implementation can handle adding and removing listeners while the
 * observers are being notified, but it is not thread-safe.
 *
 *
 * @since JavaFX 2.0
 */
public abstract class ObservableValueBase<T> implements ObservableValue<T> {

private ExpressionHelper<T> helper;

/**
     * {@inheritDoc}
     */
    @Override
    public void addListener(InvalidationListener listener) {
        helper = ExpressionHelper.addListener(helper, this, listener);
    }

/**
     * {@inheritDoc}
     */
    @Override
    public void addListener(ChangeListener<? super T> listener) {
        helper = ExpressionHelper.addListener(helper, this, listener);
    }

/**
     * {@inheritDoc}
     */
    @Override
    public void removeListener(InvalidationListener listener) {
        helper = ExpressionHelper.removeListener(helper, listener);
    }

/**
     * {@inheritDoc}
     */
    @Override
    public void removeListener(ChangeListener<? super T> listener) {
        helper = ExpressionHelper.removeListener(helper, listener);
    }

/**
     * Notify the currently registered observers of a value change.
     *
     * This implementation will ignore all adds and removes of observers that
     * are done while a notification is processed. The changes take effect in
     * the following call to fireValueChangedEvent.
     */
    protected void fireValueChangedEvent() {
        ExpressionHelper.fireValueChangedEvent(helper);
    }
}

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