49 lines
1.8 KiB
Kotlin
49 lines
1.8 KiB
Kotlin
package ch.dissem.apps.abit.util
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import android.content.Context
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import android.preference.PreferenceManager
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import ch.dissem.apps.abit.util.Constants.PREFERENCE_POW_AVERAGE
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import ch.dissem.apps.abit.util.Constants.PREFERENCE_POW_COUNT
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import java.math.BigInteger
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/**
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* POW statistics that might help estimate the POW time, depending on
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*/
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object PowStats {
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private val TWO_POW_64: BigInteger = BigInteger.valueOf(2).pow(64)
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private var averagePowUnitTime = 0L
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private var powCount = 0L
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fun getExpectedPowTimeInMilliseconds(ctx: Context, target: ByteArray): Long {
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if (averagePowUnitTime == 0L) {
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val preferences = PreferenceManager.getDefaultSharedPreferences(ctx)
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synchronized(this) {
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averagePowUnitTime = preferences.getLong(PREFERENCE_POW_AVERAGE, 0L)
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powCount = preferences.getLong(PREFERENCE_POW_COUNT, 0L)
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}
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}
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return (averagePowUnitTime * BigInteger(target) / TWO_POW_64).toLong()
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}
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fun addPow(ctx: Context, time: Long, target: ByteArray) {
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val targetBigInt = BigInteger(target)
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val powCountBefore = BigInteger.valueOf(powCount)
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synchronized(this) {
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powCount++
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averagePowUnitTime = (
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(averagePowUnitTime * powCountBefore + (time * TWO_POW_64 / targetBigInt)) / powCount
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).toLong()
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val preferences = PreferenceManager.getDefaultSharedPreferences(ctx)
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preferences.edit()
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.putLong(PREFERENCE_POW_AVERAGE, averagePowUnitTime)
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.putLong(PREFERENCE_POW_COUNT, powCount)
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.apply()
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}
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}
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private operator fun Long.times(other: BigInteger) = this.toBigInteger() * other
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private operator fun BigInteger.div(other: Long) = this / other.toBigInteger()
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}
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