--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/FlightRecorderListener.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,80 @@
+/*
+ * 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.  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 jdk.jfr;
+
+
+/**
+ * Callback interface to monitor Flight Recorder's life cycle.
+ *
+ * @since 9
+ */
+public interface FlightRecorderListener {
+
+    /**
+     * Receives notification when Flight Recorder is initialized.
+     * <p>
+     * This method is also be invoked when a listener is added to an already
+     * initialized Flight Recorder.
+     * <p>
+     * This method allows clients to implement their own initialization mechanism
+     * that is executed before a {@code FlightRecorder} instance is returned by
+     * {@code FlightRecorder#getFlightRecorder()}.
+     *
+     * @implNote This method should return as soon as possible, to avoid blocking
+     *           initialization of Flight Recorder. To avoid deadlocks or unexpected
+     *           behavior, this method should not call
+     *           {@link FlightRecorder#getFlightRecorder()} or start new recordings.
+     *
+     * @implSpec The default implementation of this method is empty.
+     *
+     * @param recorder Flight Recorder instance, not {@code null}
+     *
+     * @see FlightRecorder#addListener(FlightRecorderListener)
+     */
+    default void recorderInitialized(FlightRecorder recorder) {
+    }
+
+    /**
+     * Receives notification when the state of a recording changes.
+     * <p>
+     * Callback is invoked when a recording reaches the {@code RUNNING},
+     * {@code STOPPED} and {@code CLOSED} state.
+     *
+     * @implNote The implementation of this method should return as soon as possible
+     *           to avoid blocking normal operation of Flight Recorder.
+     *
+     * @implSpec The default implementation of this method is empty.
+     *
+     * @param recording the recording where the state change occurred, not
+     *        {@code null}
+     *
+     * @see FlightRecorder#addListener(FlightRecorderListener)
+     * @see RecordingState
+     *
+     */
+    default void recordingStateChanged(Recording recording) {
+    }
+}