1 /*
   2  * Copyright (c) 2016, 2018, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_JFR_WRITERS_JFRJAVAEVENTWRITER_HPP
  26 #define SHARE_VM_JFR_WRITERS_JFRJAVAEVENTWRITER_HPP
  27 
  28 #include "jni.h"
  29 #include "memory/allocation.hpp"
  30 
  31 class JavaThread;
  32 class Thread;
  33 
  34 class JfrJavaEventWriter : AllStatic {
  35   friend class JfrCheckpointThreadClosure;
  36   friend class JfrJavaEventWriterNotifyOperation;
  37   friend class JfrJavaEventWriterNotificationClosure;
  38  private:
  39   static void notify(JavaThread* jt);
  40 
  41  public:
  42   static bool has_required_classes(TRAPS);
  43   static bool initialize();
  44   static void notify();
  45   static jobject event_writer(Thread* t);
  46   static jobject new_event_writer(TRAPS);
  47   static jboolean flush(jobject writer, jint used, jint requested, JavaThread* jt);
  48 };
  49 
  50 #endif // SHARE_VM_JFR_WRITERS_JFRJAVAEVENTWRITER_HPP