Package org.summerboot.jexpress.util

Class TimeUtil

java.lang.Object

org.summerboot.jexpress.util.TimeUtil

public class TimeUtil
extends Object

Author:

Changski Tie Zheng Zhang 张铁铮, 魏泽北, 杜旺财, 杜富贵

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TimeUtil.TimeDto

Field Summary

Fields

Modifier and Type	Field	Description
static DateTimeFormatter	ISO_ZONED_DATE_TIME3
protected static Random	RANDOM
static DateTimeFormatter	UTC_DATE_TIME_FORMATTER
static ZoneId	ZONE_ID_ONTARIO

Constructor Summary

Constructors

Constructor	Description
TimeUtil()

Method Summary

Modifier and Type	Method	Description
static long	getSecondsSinceMidnight(Calendar c)
static long	getSecondsTillMidnight(Calendar c)
static int	random(int low, int high)
static int[]	seconds2DHMS(long totalSeconds)
static String	seconds2DHMSString(long totalSeconds)
static LocalDateTime	toLocalDateTime(long epochTs)
static LocalDateTime	toLocalDateTime(long epochTs, ZoneId zoneId)
static OffsetDateTime	toOffsetDateTime(long epochTs, ZoneId zoneId)
static OffsetDateTime	toOffsetDateTime(LocalDate localDate, ZoneId zoneId)
static ZonedDateTime	toZonedDateTime(LocalDate localDate, ZoneId zoneId)
static ZonedDateTime	toZonedDateTime(ZoneId zoneId, long epochSec, int days, int hourOfDay, int minuteOfHour, int secondOfMinute)
static double	truncatedExponentialBackoffSlots(int retry, int truncatedMaxRetry)	expected backoff time = random value between (2^n - 1)/2 and (2^n - 1), n should be truncated by max retry.
static String	utcDateTimeToLocalDateTime(String utcTime, ZoneId zoneId)	Maps the UTC time to an ET format.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

ISO_ZONED_DATE_TIME3

public static DateTimeFormatter ISO_ZONED_DATE_TIME3

UTC_DATE_TIME_FORMATTER

public static DateTimeFormatter UTC_DATE_TIME_FORMATTER

ZONE_ID_ONTARIO

public static ZoneId ZONE_ID_ONTARIO

RANDOM

protected static Random RANDOM

Constructor Details

TimeUtil

public TimeUtil()

Method Details

getSecondsSinceMidnight

public static long getSecondsSinceMidnight(Calendar c)

getSecondsTillMidnight

public static long getSecondsTillMidnight(Calendar c)

seconds2DHMS

public static int[] seconds2DHMS(long totalSeconds)

seconds2DHMSString

public static String seconds2DHMSString(long totalSeconds)

utcDateTimeToLocalDateTime

public static String utcDateTimeToLocalDateTime(String utcTime,
 ZoneId zoneId)

Maps the UTC time to an ET format.

Parameters:

utcTime - UTC time to be formatted.

zoneId -

Returns:

ET formatted time.

toLocalDateTime

public static LocalDateTime toLocalDateTime(long epochTs)

toLocalDateTime

public static LocalDateTime toLocalDateTime(long epochTs,
 ZoneId zoneId)

toOffsetDateTime

public static OffsetDateTime toOffsetDateTime(long epochTs,
 ZoneId zoneId)

toZonedDateTime

public static ZonedDateTime toZonedDateTime(ZoneId zoneId,
 long epochSec,
 int days,
 int hourOfDay,
 int minuteOfHour,
 int secondOfMinute)

toOffsetDateTime

public static OffsetDateTime toOffsetDateTime(LocalDate localDate,
 ZoneId zoneId)

toZonedDateTime

public static ZonedDateTime toZonedDateTime(LocalDate localDate,
 ZoneId zoneId)

random

public static int random(int low,
 int high)

truncatedExponentialBackoffSlots

public static double truncatedExponentialBackoffSlots(int retry,
 int truncatedMaxRetry)

expected backoff time = random value between (2^n - 1)/2 and (2^n - 1), n should be truncated by max retry. For the example, E(3) = 3.5 slots, the expected backoff slots should between 3 ~ 7 slots

Parameters:

retry - the (n)th retry

truncatedMaxRetry - stop(truncate) exponential backoff when after truncatedMax retry

Returns:

the expected backoff slots