1 /*
   2  * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.event.io;
  27 import java.util.Set;
  28 import java.util.HashSet;
  29 
  30 // Will be used by the TestInstrumentation.java as a callback from
  31 // instrumented classes.
  32 public class InstrumentationCallback {
  33 
  34     private static Set<String> keys = new HashSet<String>();
  35 
  36     public static synchronized void callback(String key) {
  37         if (!keys.contains(key)) {
  38             keys.add(key);
  39         }
  40     }
  41 
  42     public static synchronized void clear() {
  43         keys.clear();
  44     }
  45 
  46     public static synchronized Set<String> getKeysCopy() {
  47         return new HashSet<String>(keys);
  48     }
  49 }