64 lines
2.2 KiB
Java
64 lines
2.2 KiB
Java
/*
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* Copyright (c) 2016, 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;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* Event field annotation, specifies that the value is a point in time.
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*
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* @since 8
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*/
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@MetadataDefinition
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@ContentType
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@Label("Timestamp")
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@Description("A point in time")
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ ElementType.FIELD, ElementType.TYPE, ElementType.METHOD})
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public @interface Timestamp {
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/**
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* The unit for the difference, measured in milliseconds, between the current
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* time and midnight, January 1, 1970 UTC.
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*/
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public final static String MILLISECONDS_SINCE_EPOCH = "MILLISECONDS_SINCE_EPOCH";
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/**
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* The unit for the number of ticks that have transpired since some arbitrary
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* starting date.
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*/
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public final static String TICKS = "TICKS";
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/**
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* Unit for the time stamp.
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*
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* @return time stamp unit, not {@code null}
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*/
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String value() default Timestamp.MILLISECONDS_SINCE_EPOCH;
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}
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