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_UTILITIES_JFRJAVALOG_HPP
  26 #define SHARE_VM_JFR_UTILITIES_JFRJAVALOG_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/exceptions.hpp"
  30 
  31 /*
  32  * A thin two-way "bridge" allowing our Java components to interface with Unified Logging (UL)
  33  *
  34  * Java can "subscribe" to be notified about UL configuration changes.
  35  * On such a configuration change, if applicable, the passed in LogTag enum instance
  36  * will be updated to reflect a new LogLevel.
  37  *
  38  * Log messages originating in Java are forwarded to UL for output.
  39  *
  40  */
  41 
  42 class JfrJavaLog : public AllStatic {
  43  public:
  44   static void subscribe_log_level(jobject log_tag, jint id, TRAPS);
  45   static void log(jint tag_set, jint level, jstring message, TRAPS);
  46 };
  47 
  48 #endif // SHARE_VM_JFR_UTILITIES_JFRJAVALOG_HPP