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/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr;
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/**
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* Callback interface to monitor Flight Recorder's life cycle.
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*
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* @since 9
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*/
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public interface FlightRecorderListener {
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/**
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* Receives notification when Flight Recorder is initialized.
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* <p>
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* This method is also be invoked when a listener is added to an already
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* initialized Flight Recorder.
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* <p>
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* This method allows clients to implement their own initialization mechanism
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* that is executed before a {@code FlightRecorder} instance is returned by
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* {@code FlightRecorder#getFlightRecorder()}.
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*
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* @implNote This method should return as soon as possible, to avoid blocking
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* initialization of Flight Recorder. To avoid deadlocks or unexpected
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* behavior, this method should not call
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* {@link FlightRecorder#getFlightRecorder()} or start new recordings.
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*
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* @implSpec The default implementation of this method is empty.
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*
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* @param recorder Flight Recorder instance, not {@code null}
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*
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* @see FlightRecorder#addListener(FlightRecorderListener)
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*/
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default void recorderInitialized(FlightRecorder recorder) {
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}
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/**
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* Receives notification when the state of a recording changes.
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* <p>
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* Callback is invoked when a recording reaches the {@code RUNNING},
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* {@code STOPPED} and {@code CLOSED} state.
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*
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* @implNote The implementation of this method should return as soon as possible
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* to avoid blocking normal operation of Flight Recorder.
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*
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* @implSpec The default implementation of this method is empty.
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*
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* @param recording the recording where the state change occurred, not
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* {@code null}
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*
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* @see FlightRecorder#addListener(FlightRecorderListener)
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* @see RecordingState
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*
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*/
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default void recordingStateChanged(Recording recording) {
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}
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}
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