[isis] branch master updated: ISIS-3275: adds tiny swing util for performance profiling

[ahuber]

This is an automated email from the ASF dual-hosted git repository.

ahuber pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/isis.git


The following commit(s) were added to refs/heads/master by this push:
     new 7a03a5366c ISIS-3275: adds tiny swing util for performance profiling
7a03a5366c is described below

commit 7a03a5366c92fad7cdde67b1cf7148272dbc8b8b
Author: andi-huber <ahu...@apache.org>
AuthorDate: Sun Dec 4 17:34:22 2022 +0100

    ISIS-3275: adds tiny swing util for performance profiling
---
 .../causeway/commons/internal/debug/swt/_Swt.java  | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git 
a/commons/src/main/java/org/apache/causeway/commons/internal/debug/swt/_Swt.java
 
b/commons/src/main/java/org/apache/causeway/commons/internal/debug/swt/_Swt.java
new file mode 100644
index 0000000000..84796c8ea0
--- /dev/null
+++ 
b/commons/src/main/java/org/apache/causeway/commons/internal/debug/swt/_Swt.java
@@ -0,0 +1,75 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.causeway.commons.internal.debug.swt;
+
+import java.awt.FlowLayout;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.util.concurrent.CountDownLatch;
+
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.SwingUtilities;
+
+import lombok.val;
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class _Swt {
+
+    public void enableSwing() {
+        System.setProperty("java.awt.headless", "false");
+    }
+
+    /**
+     * Display a Swing dialog to be confirmed with an OK button.
+     * <p>
+     * Blocks the calling thread until the dialog is closed.
+     * <p>
+     * Introduced to stop the program at specific point(s),
+     * to allow for performance profiling.
+     */
+    public void prompt(final String message) {
+
+        val awaitableLatch = new CountDownLatch(1);
+
+        SwingUtilities.invokeLater(()->{
+            val frame = new JFrame();
+            frame.getContentPane().setLayout(new FlowLayout());
+            frame.getContentPane().add(new JLabel(message));
+            frame.pack();
+            frame.setLocationRelativeTo(null); // center to screen
+            frame.setVisible(true);
+            frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+            frame.addWindowListener(new WindowAdapter() {
+                @Override
+                public void windowClosing(final WindowEvent arg0) {
+                    frame.setVisible(false);
+                    awaitableLatch.countDown();
+                }
+            });
+        });
+        try {
+            awaitableLatch.await();
+        } catch (InterruptedException e) {
+            // ignore
+        }
+    }
+
+}