| /* |
| * 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; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * Event field annotation, specifies that the value is a duration. |
| * |
| * @since 9 |
| */ |
| @MetadataDefinition |
| @ContentType |
| @Label("Timespan") |
| @Description("A duration, measured in nanoseconds by default") |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ ElementType.FIELD, ElementType.TYPE, ElementType.METHOD}) |
| public @interface Timespan { |
| /** |
| * Unit for ticks. |
| */ |
| public static final String TICKS = "TICKS"; |
| /** |
| * Unit for seconds. |
| */ |
| public static final String SECONDS = "SECONDS"; |
| /** |
| * Unit for milliseconds. |
| */ |
| public static final String MILLISECONDS = "MILLISECONDS"; |
| /** |
| * Unit for nanoseconds. |
| */ |
| public static final String NANOSECONDS = "NANOSECONDS"; |
| |
| /** |
| * Unit for microseconds. |
| */ |
| public static final String MICROSECONDS = "MICROSECONDS"; |
| |
| /** |
| * Returns the unit of measure for the time span. |
| * <p> |
| * By default, the unit is nanoseconds. |
| * |
| * @return the time span unit, default {@code #NANOSECONDS}, not {@code null} |
| */ |
| String value() default NANOSECONDS; |
| } |