--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/utilities/jfrJavaLog.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2016, 2018, 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.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_UTILITIES_JFRJAVALOG_HPP
+#define SHARE_VM_JFR_UTILITIES_JFRJAVALOG_HPP
+
+#include "memory/allocation.hpp"
+#include "utilities/exceptions.hpp"
+
+/*
+ * A thin two-way "bridge" allowing our Java components to interface with Unified Logging (UL)
+ *
+ * Java can "subscribe" to be notified about UL configuration changes.
+ * On such a configuration change, if applicable, the passed in LogTag enum instance
+ * will be updated to reflect a new LogLevel.
+ *
+ * Log messages originating in Java are forwarded to UL for output.
+ *
+ */
+
+class JfrJavaLog : public AllStatic {
+ public:
+  static void subscribe_log_level(jobject log_tag, jint id, TRAPS);
+  static void log(jint tag_set, jint level, jstring message, TRAPS);
+};
+
+#endif // SHARE_VM_JFR_UTILITIES_JFRJAVALOG_HPP