/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

/**

 * @test

 * @bug 8072775

 * @run main/othervm -Xmx80m TextViewOOM

 */

public class TextViewOOM {

    private static JFrame frame;

    private static JTextArea ta;

    private static final String STRING = "\uDC00\uD802\uDFFF";

    private static final int N = 5000;

    private static void createAndShowGUI() {

        frame = new JFrame();

        final JScrollPane jScrollPane1 = new JScrollPane();

        ta = new JTextArea();

        ta.setEditable(false);

        ta.setColumns(20);

        ta.setRows(5);

        jScrollPane1.setViewportView(ta);

        frame.add(ta);

        frame.pack();

        frame.setLocationRelativeTo(null);

        frame.setVisible(true);

    }

    public static void main(final String[] args) throws Exception {

        /* Create and display the form */

        EventQueue.invokeAndWait(TextViewOOM::createAndShowGUI);

        for (int i = 0; i < 10; i++) {

            System.gc();

            Thread.sleep(1000);

        }

        long mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

        System.err.println("Memory before creating the text: "+mem);

        final StringBuilder sb = new StringBuilder(N * STRING.length());

        for (int i = 0; i < N; i++) {

            sb.append(STRING);

        }

        for (int i = 0; i < 10; i++) {

            System.gc();

            Thread.sleep(1000);

        }

        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

        System.err.println("Memory after  creating the text: "+mem);

        EventQueue.invokeAndWait(() -> {

            ta.setText(sb.toString());

            for (int i = 0; i < 10; i++) {

                System.gc();

                try {Thread.sleep(200);} catch (InterruptedException iex) {}

            }

            long mem1 = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

            System.err.println("Memory after  setting the text: " + mem1);

        });

        for (int i = 0; i < 10; i++) {

            System.gc();

            Thread.sleep(1000);

        }

        mem = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();

        System.err.println("Final memory  after everything: " + mem);

        EventQueue.invokeAndWait(frame::dispose);

    }

}