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/*
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* Copyright (c) 2019, 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.consumer;
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import java.io.IOException;
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import java.security.AccessControlContext;
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import java.security.AccessController;
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import java.time.Duration;
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import java.util.function.Consumer;
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import jdk.jfr.Configuration;
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import jdk.jfr.Event;
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import jdk.jfr.EventSettings;
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import jdk.jfr.EventType;
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import jdk.jfr.Recording;
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import jdk.jfr.internal.PlatformRecording;
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import jdk.jfr.internal.PrivateAccess;
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import jdk.jfr.internal.Utils;
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/**
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* An event stream produces events from a file, directory or a running JVM (Java
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* Virtual Machine).
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*/
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public class RecordingStream implements AutoCloseable, EventStream {
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private final Recording recording;
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private final EventDirectoryStream stream;
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/**
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* Creates an event stream for this JVM (Java Virtual Machine).
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* <p>
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* The following example shows how to create a recording stream that prints
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* CPU usage and information about garbage collections.
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*
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* <pre>
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* <code>
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* try (RecordingStream r = new RecordingStream()) {
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* r.enable("jdk.GarbageCollection");
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* r.enable("jdk.CPULoad").withPeriod(Duration.ofSeconds(1));
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* r.onEvent(System.out::println);
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* r.start();
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* }
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* </code>
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* </pre>
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*
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* @throws IllegalStateException if Flight Recorder can't be created (for
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* example, if the Java Virtual Machine (JVM) lacks Flight Recorder
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* support, or if the file repository can't be created or accessed)
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*
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* @throws SecurityException if a security manager exists and the caller
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* does not have
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* {@code FlightRecorderPermission("accessFlightRecorder")}
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*/
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public RecordingStream() {
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Utils.checkAccessFlightRecorder();
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AccessControlContext acc = AccessController.getContext();
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this.recording = new Recording();
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this.recording.setFlushInterval(Duration.ofMillis(1000));
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try {
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this.stream = new EventDirectoryStream(acc);
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} catch (IOException ioe) {
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throw new IllegalStateException(ioe.getMessage());
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}
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}
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/**
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* Creates a recording stream using settings from a configuration.
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* <p>
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* The following example shows how to create a recording stream that uses a
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* predefined configuration.
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*
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* <pre>
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* <code>
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* Configuration c = Configuration.getConfiguration("default");
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* try (RecordingStream r = new RecordingStream(c)) {
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* r.onEvent(System.out::println);
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* r.start();
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* }
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* </code>
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* </pre>
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*
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* @param configuration configuration that contains the settings to be use,
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* not {@code null}
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*
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* @throws IllegalStateException if Flight Recorder can't be created (for
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* example, if the Java Virtual Machine (JVM) lacks Flight Recorder
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* support, or if the file repository can't be created or accessed)
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*
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* @throws SecurityException if a security manager is used and
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* FlightRecorderPermission "accessFlightRecorder" is not set.
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*
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* @see Configuration
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*/
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public RecordingStream(Configuration configuration) {
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this();
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recording.setSettings(configuration.getSettings());
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}
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/**
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* Enables the event with the specified name.
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* <p>
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* If multiple events have the same name (for example, the same class is
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* loaded in different class loaders), then all events that match the name
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* are enabled. To enable a specific class, use the {@link #enable(Class)}
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* method or a {@code String} representation of the event type ID.
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*
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* @param name the settings for the event, not {@code null}
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*
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* @return an event setting for further configuration, not {@code null}
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*
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* @see EventType
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*/
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public EventSettings enable(String name) {
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return recording.enable(name);
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}
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/**
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* Enables event.
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*
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* @param eventClass the event to enable, not {@code null}
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*
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* @throws IllegalArgumentException if {@code eventClass} is an abstract
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* class or not a subclass of {@link Event}
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*
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* @return an event setting for further configuration, not {@code null}
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*/
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public EventSettings enable(Class<? extends Event> eventClass) {
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return recording.enable(eventClass);
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}
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/**
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* Disables event with the specified name.
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* <p>
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* If multiple events with same name (for example, the same class is loaded
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* in different class loaders), then all events that match the name is
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* disabled. To disable a specific class, use the {@link #disable(Class)}
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* method or a {@code String} representation of the event type ID.
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*
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* @param name the settings for the event, not {@code null}
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*
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* @return an event setting for further configuration, not {@code null}
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*
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*/
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public EventSettings disable(String name) {
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return recording.disable(name);
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}
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/**
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* Disables event.
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*
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* @param eventClass the event to enable, not {@code null}
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*
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* @throws IllegalArgumentException if {@code eventClass} is an abstract
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* class or not a subclass of {@link Event}
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*
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* @return an event setting for further configuration, not {@code null}
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*
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*/
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public EventSettings disable(Class<? extends Event> eventClass) {
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return recording.disable(eventClass);
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}
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/**
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* Determines how far back data is kept for the stream if the stream can't
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* keep up.
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* <p>
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* To control the amount of recording data stored on disk, the maximum
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* length of time to retain the data can be specified. Data stored on disk
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* that is older than the specified length of time is removed by the Java
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* Virtual Machine (JVM).
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* <p>
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* If neither maximum limit or the maximum age is set, the size of the
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* recording may grow indefinitely if events are on
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*
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* @param maxAge the length of time that data is kept, or {@code null} if
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* infinite
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*
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* @throws IllegalArgumentException if <code>maxAge</code> is negative
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*
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* @throws IllegalStateException if the recording is in the {@code CLOSED}
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* state
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*/
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public void setMaxAge(Duration maxAge) {
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recording.setMaxAge(maxAge);
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}
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/**
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* Determines how much data is kept in the disk repository if the stream
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* can't keep up.
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* <p>
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* To control the amount of recording data that is stored on disk, the
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* maximum amount of data to retain can be specified. When the maximum limit
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* is exceeded, the Java Virtual Machine (JVM) removes the oldest chunk to
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* make room for a more recent chunk.
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* <p>
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* If neither maximum limit or the maximum age is set, the size of the
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* recording may grow indefinitely.
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*
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* @param maxSize the amount of data to retain, {@code 0} if infinite
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*
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* @throws IllegalArgumentException if <code>maxSize</code> is negative
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*
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* @throws IllegalStateException if the recording is in {@code CLOSED} state
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*/
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public void setMaxSize(long maxSize) {
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recording.setMaxSize(maxSize);
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}
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@Override
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public void onEvent(String eventName, Consumer<RecordedEvent> action) {
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stream.onEvent(eventName, action);
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}
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@Override
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public void onEvent(Consumer<RecordedEvent> action) {
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stream.onEvent(action);
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}
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@Override
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public void onFlush(Runnable action) {
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stream.onFlush(action);
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}
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@Override
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public void onClose(Runnable action) {
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stream.onClose(action);
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}
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@Override
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public void close() {
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recording.close();
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stream.close();
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}
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@Override
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public boolean remove(Object action) {
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return stream.remove(action);
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}
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@Override
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public void start() {
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PlatformRecording pr = PrivateAccess.getInstance().getPlatformRecording(recording);
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long startNanos = pr.start();
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stream.start(startNanos);
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}
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@Override
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public void startAsync() {
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PlatformRecording pr = PrivateAccess.getInstance().getPlatformRecording(recording);
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long startNanos = pr.start();
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stream.startAsync(startNanos);
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}
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@Override
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public void awaitTermination(Duration timeout) {
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stream.awaitTermination(timeout);
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}
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/**
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* Determines how often events are made available for streaming.
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*
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* @param interval the interval at which events are made available to the
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* stream
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*
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* @throws IllegalArgumentException if <code>interval</code> is negative
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*
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* @throws IllegalStateException if the stream is closed
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*/
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public void setInterval(Duration duration) {
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recording.setFlushInterval(duration);
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}
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@Override
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public void awaitTermination() {
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stream.awaitTermination();
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}
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@Override
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public void setReuse(boolean reuse) {
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// hint is ignored
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}
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}
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