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December 8, 2017 19:44
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Sync Time between two devices
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import kotlin.* | |
import kotlin.jvm.* | |
import java.util.* | |
import java.lang.* | |
import java.time.* | |
import java.time.temporal.* | |
/** | |
* We declare a package-level function main which returns Unit and takes | |
* an Array of strings as a parameter. Note that semicolons are optional. | |
*/ | |
fun main(args: Array<String>) { | |
val zoneId = ZoneId.of("America/Chicago") | |
var serverDate = ZonedDateTime.of(2017, 12, 8, 13, 30, 0, 0, zoneId) | |
val nowDate = ZonedDateTime.now(zoneId) | |
val timeOffset: Long = -7759 //fixed for test, almost 8 seconds - 7.759s | |
//val timeOffset = ChronoUnit.MILLIS.between(nowDate, serverDate) | |
val dateTimeProvider = OffsetDateTimeProvider(timeOffset) { nowDate } | |
val providerNowDate = dateTimeProvider.now() | |
println(nowDate) | |
println(timeOffset) | |
println(providerNowDate) | |
println(ChronoUnit.SECONDS.between(nowDate, providerNowDate)) | |
println(ChronoUnit.SECONDS.between(nowDate, providerNowDate) * 1000 - ChronoUnit.MILLIS.between(nowDate, providerNowDate)) | |
} | |
class OffsetDateTimeProvider(val milisecondsOffset: Long, val nowFn: () -> ZonedDateTime){ | |
fun now(): ZonedDateTime { | |
val nowDateTime = this.nowFn() | |
val result = nowDateTime.plus(milisecondsOffset, ChronoUnit.MILLIS) | |
return result | |
} | |
} |
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Device1 fire a "Start Stopwatch event";
Device[n] obtains the time, compares with its own (in milliseconds);
Device[n] will know the time difference to sync when getting DateTimes