Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\runtime\async\AbstractAsyncOperation.java

/*
 * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.runtime.async;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

import javafx.application.Platform;

/**
 * AbstractAsyncOperation.   Base class for result-bearing, asynchronous operations. Some operations are asynchronous
 * because they would potentially block the EDT for unacceptably long. Since JFX lacks a clear concurrency model,
 * allowing users to execute arbitrary JFX code in background threads would invariably cause problems.  Therefore,
 * we provide a number of Java classes for async operations, which will execute in a background thread, such as
 * "fetch a resource over the web".  Async operations should not access any JFX state except the immutable parameters
 * passed in, and should not have side effects other than those managed by thread-safe Java classes.
 *
 * Async operations are one-time use; subclasses should not attempt to reuse them.
 *
 */
public abstract class AbstractAsyncOperation<V> implements AsyncOperation,
                                                           Callable<V> {

protected final FutureTask<V> future;
    protected final AsyncOperationListener listener;

private int progressGranularity = 100;
    private int progressMax, lastProgress, progressIncrement, nextProgress, bytesRead;

protected AbstractAsyncOperation(final AsyncOperationListener<V> listener) {
        this.listener = listener;

Callable<V> callable = () -> AbstractAsyncOperation.this.call();

final Runnable completionRunnable = new Runnable() {
            public void run() {
                if (future.isCancelled()) {
                    listener.onCancel();
                }
                else
                    try {
                        listener.onCompletion(future.get());
                    }
                    catch (InterruptedException e) {
                        listener.onCancel();
                    }
                    catch (ExecutionException e) {
                        listener.onException(e);
                    }
            }
        };

future = new FutureTask<V>(callable) {
            @Override
            protected void done() {
                try {
                    Platform.runLater(completionRunnable);
                }
                finally {
                    super.done();
                }
            }
        };
    }

public boolean isCancelled() {
        return future.isCancelled();
    }

public boolean isDone() {
        return future.isDone();
    }

public void cancel() {
        future.cancel(true);
    }

public void start() {
        BackgroundExecutor.getExecutor().execute(future);
    }

protected void notifyProgress() {
        final int last = lastProgress;
        final int max = progressMax;
        Platform.runLater(() -> listener.onProgress(last, max));
    }

protected void addProgress(int amount) {
        bytesRead += amount;
        if (bytesRead > nextProgress) {
            lastProgress = bytesRead;
            notifyProgress();
            nextProgress = ((lastProgress / progressIncrement) + 1) * progressIncrement;
        }
    }

protected int getProgressMax() {
        return progressMax;
    }

protected void setProgressMax(int progressMax) {
        if (progressMax == 0) {
            progressIncrement = progressGranularity;
        }
        else if (progressMax == -1) {
            progressIncrement = progressGranularity;
        }
        else {
            this.progressMax = progressMax;
            progressIncrement = progressMax / progressGranularity;
            if(progressIncrement < 1) {
                progressIncrement = 1;
            }
        }
        nextProgress = ((lastProgress / progressIncrement) + 1) * progressIncrement;
        notifyProgress();
    }

protected int getProgressGranularity() {
        return progressGranularity;
    }

protected void setProgressGranularity(int progressGranularity) {
        this.progressGranularity = progressGranularity;
        progressIncrement = progressMax / progressGranularity;
        nextProgress = ((lastProgress / progressIncrement) + 1) * progressIncrement;
        notifyProgress();
    }

}

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