From 1faf201e8608dfa4d7af3460fd3d1fc7ebec398b Mon Sep 17 00:00:00 2001
From: talasila <talasila@research.att.com>
Date: Tue, 7 Feb 2017 11:47:55 -0500
Subject: Initial OpenECOMP Portal SDK commit

Change-Id: I66a3491600a4b9ea241128dc29267eed6a78ed76
Signed-off-by: talasila <talasila@research.att.com>
---
 .../analytics/gmap/utils/SwingWorker.java          | 155 +++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 ecomp-sdk/sdk-analytics/src/main/java/org/openecomp/portalsdk/analytics/gmap/utils/SwingWorker.java

(limited to 'ecomp-sdk/sdk-analytics/src/main/java/org/openecomp/portalsdk/analytics/gmap/utils/SwingWorker.java')

diff --git a/ecomp-sdk/sdk-analytics/src/main/java/org/openecomp/portalsdk/analytics/gmap/utils/SwingWorker.java b/ecomp-sdk/sdk-analytics/src/main/java/org/openecomp/portalsdk/analytics/gmap/utils/SwingWorker.java
new file mode 100644
index 00000000..26cbb114
--- /dev/null
+++ b/ecomp-sdk/sdk-analytics/src/main/java/org/openecomp/portalsdk/analytics/gmap/utils/SwingWorker.java
@@ -0,0 +1,155 @@
+/*-
+ * ================================================================================
+ * eCOMP Portal SDK
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property
+ * ================================================================================
+ * Licensed 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.openecomp.portalsdk.analytics.gmap.utils;
+
+import javax.swing.SwingUtilities;
+
+/**
+ * This is the 3rd version of SwingWorker (also known as
+ * SwingWorker 3), an abstract class that you subclass to
+ * perform GUI-related work in a dedicated thread.  For
+ * instructions on using this class, see:
+ * 
+ * http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html
+ *
+ * Note that the API changed slightly in the 3rd version:
+ * You must now invoke start() on the SwingWorker after
+ * creating it.
+ */
+public abstract class SwingWorker {
+    private Object value;  // see getValue(), setValue()
+    private Thread thread;
+
+    /** 
+     * Class to maintain reference to current worker thread
+     * under separate synchronization control.
+     */
+    private static class ThreadVar {
+        private Thread thread;
+        ThreadVar(Thread t) { thread = t; }
+        synchronized Thread get() { return thread; }
+        synchronized void clear() { thread = null; }
+    }
+
+    private ThreadVar threadVar;
+
+    /** 
+     * Get the value produced by the worker thread, or null if it 
+     * hasn't been constructed yet.
+     */
+    protected synchronized Object getValue() { 
+        return value; 
+    }
+
+    /** 
+     * Set the value produced by worker thread 
+     */
+    private synchronized void setValue(Object x) { 
+        value = x; 
+    }
+
+    /** 
+     * Compute the value to be returned by the <code>get</code> method. 
+     */
+    public abstract Object construct();
+
+    /**
+     * Called on the event dispatching thread (not on the worker thread)
+     * after the <code>construct</code> method has returned.
+     */
+    public void finished() {
+    }
+
+    /**
+     * A new method that interrupts the worker thread.  Call this method
+     * to force the worker to stop what it's doing.
+     */
+    public void interrupt() {
+        Thread t = threadVar.get();
+        if (t != null) {
+            t.interrupt();
+        }
+        threadVar.clear();
+    }
+
+    /**
+     * Return the value created by the <code>construct</code> method.  
+     * Returns null if either the constructing thread or the current
+     * thread was interrupted before a value was produced.
+     * 
+     * @return the value created by the <code>construct</code> method
+     */
+    public Object get() {
+        while (true) {  
+            Thread t = threadVar.get();
+            if (t == null) {
+                return getValue();
+            }
+            try {
+                t.join();
+            }
+            catch (InterruptedException e) {
+                Thread.currentThread().interrupt(); // propagate
+                return null;
+            }
+        }
+    }
+
+
+    /**
+     * Start a thread that will call the <code>construct</code> method
+     * and then exit.
+     */
+    public SwingWorker() {
+        final Runnable doFinished = new Runnable() {
+           public void run() { finished(); }
+        };
+
+        Runnable doConstruct = new Runnable() { 
+            public void run() {
+                try {
+                    setValue(construct());
+                }
+                finally {
+                    threadVar.clear();
+                }
+
+                SwingUtilities.invokeLater(doFinished);
+            }
+        };
+
+        Thread t = new Thread(doConstruct);
+        threadVar = new ThreadVar(t);
+    }
+
+    /**
+     * Start the worker thread.
+     */
+    public void start() {
+        Thread t = threadVar.get();
+        if (t != null) {
+            t.start();
+        }
+    }
+    
+    public Thread getThread() {
+    	return threadVar.get();
+    }
+}
-- 
cgit 1.2.3-korg