1 /*

     2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.jfr.consumer;

    27 

    28 import java.time.DateTimeException;

    29 import java.time.ZoneOffset;

    30 

    31 import jdk.jfr.internal.LogLevel;

    32 import jdk.jfr.internal.LogTag;

    33 import jdk.jfr.internal.Logger;

    34 import jdk.jfr.internal.consumer.ChunkHeader;

    35 

    36 /**

    37  * Converts ticks to nanoseconds

    38  */

    39 final class TimeConverter {

    40     private final long startTicks;

    41     private final long startNanos;

    42     private final double divisor;

    43     private final ZoneOffset zoneOffet;

    44 

    45     TimeConverter(ChunkHeader chunkHeader, int rawOffset) {

    46         this.startTicks = chunkHeader.getStartTicks();

    47         this.startNanos = chunkHeader.getStartNanos();

    48         this.divisor = chunkHeader.getTicksPerSecond() / 1000_000_000L;

    49         this.zoneOffet = zoneOfSet(rawOffset);

    50     }

    51 

    52     private ZoneOffset zoneOfSet(int rawOffset) {

    53         try {

    54             return ZoneOffset.ofTotalSeconds(rawOffset / 1000);

    55         } catch (DateTimeException dte) {

    56             Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Could not create ZoneOffset from raw offset " + rawOffset);

    57         }

    58         return ZoneOffset.UTC;

    59     }

    60 

    61     public long convertTimestamp(long ticks) {

    62         return startNanos + (long) ((ticks - startTicks) / divisor);

    63     }

    64 

    65     public long convertTimespan(long ticks) {

    66         return (long) (ticks / divisor);

    67     }

    68 

    69     public ZoneOffset getZoneOffset() {

    70         return zoneOffet;

    71     }

    72 }