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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.internal.handlers;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import jdk.jfr.EventType;
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import jdk.jfr.internal.EventControl;
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import jdk.jfr.internal.JVM;
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import jdk.jfr.internal.PlatformEventType;
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import jdk.jfr.internal.PrivateAccess;
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import jdk.jfr.internal.StringPool;
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// Users should not be subclass for security reasons.
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public abstract class EventHandler {
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// Accessed by generated sub class
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protected final PlatformEventType platformEventType;
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private final EventType eventType;
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private final EventControl eventControl;
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// Accessed by generated sub class
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EventHandler(boolean registered, EventType eventType, EventControl eventControl) {
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this.eventType = eventType;
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this.platformEventType = PrivateAccess.getInstance().getPlatformEventType(eventType);
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this.eventControl = eventControl;
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platformEventType.setRegistered(registered);
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}
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final protected StringPool createStringFieldWriter() {
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return new StringPool();
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}
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// Accessed by generated code in event class
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public final boolean shouldCommit(long duration) {
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return isEnabled() && duration >= platformEventType.getThresholdTicks();
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}
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// Accessed by generated code in event class
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// Accessed by generated sub class
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public final boolean isEnabled() {
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return platformEventType.isCommitable();
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}
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public final EventType getEventType() {
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return eventType;
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}
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public final PlatformEventType getPlatformEventType() {
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return platformEventType;
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}
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public final EventControl getEventControl() {
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return eventControl;
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}
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public static long timestamp() {
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return JVM.counterTime();
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}
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public static long duration(long startTime) {
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if (startTime == 0) {
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// User forgot to invoke begin, or instrumentation was
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// added after the user invoked begin.
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// Returning 0 will make it an instant event
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return 0;
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}
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return timestamp() - startTime;
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}
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// Prevent a malicious user from instantiating a generated event handlers.
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@Override
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public final Object clone() throws java.lang.CloneNotSupportedException {
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throw new CloneNotSupportedException();
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}
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private final void writeObject(ObjectOutputStream out) throws IOException {
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throw new IOException("Object cannot be serialized");
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}
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private final void readObject(ObjectInputStream in) throws IOException {
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throw new IOException("Class cannot be deserialized");
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}
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public boolean isRegistered() {
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return platformEventType.isRegistered();
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}
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public boolean setRegistered(boolean registered) {
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return platformEventType.setRegistered(registered);
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}
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}
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