Utility class VisualVM for basic tasks related to the host VisualVM instance

 - currently providing parallel and sequential RequestProcessor entrypoints

Author: jisedlac

visualvm/core/nbproject/project.xml

@@ -199,6 +199,7 @@
                 </test-type>
             </test-dependencies>
             <public-packages>
+                <package>org.graalvm.visualvm.core</package>
                 <package>org.graalvm.visualvm.core.datasource</package>
                 <package>org.graalvm.visualvm.core.datasource.descriptor</package>
                 <package>org.graalvm.visualvm.core.datasupport</package>

visualvm/core/src/org/graalvm/visualvm/core/VisualVM.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2020, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.visualvm.core;
+
+import org.openide.util.RequestProcessor;
+
+/**
+ *
+ * @author Jiri Sedlacek
+ */
+public final class VisualVM {
+    
+    private static final VisualVM INSTANCE = new VisualVM();
+    
+    
+    private final int PARALLEL_PROCESSOR_THROUGHPUT_DEFAULT = 10;
+    private final int PARALLEL_PROCESSOR_THROUGHPUT = Integer.getInteger("org.graalvm.visualvm.core.parallelProcessorThroughput", // NOI18N
+                                                                         PARALLEL_PROCESSOR_THROUGHPUT_DEFAULT);
+    
+    
+    private final RequestProcessor parallelProcessor;
+    private final RequestProcessor sequentialProcessor;
+    
+    
+    private VisualVM() {
+        parallelProcessor = new RequestProcessor("VisualVM Parallel RequestProcessor", PARALLEL_PROCESSOR_THROUGHPUT); // NOI18N
+        sequentialProcessor = new RequestProcessor("VisualVM Sequential RequestProcessor"); // NOI18N
+    }
+    
+    
+    public static VisualVM getInstance() { return INSTANCE; }
+    
+    
+    public final void runTask(Runnable task) {
+        parallelProcessor.post(task);
+    }
+    
+    public final void runSequentialTask(Runnable task) {
+        sequentialProcessor.post(task);
+    }
+    
+}