package cn.flightfeather.supervision.infrastructure.utils
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import org.apache.commons.logging.LogFactory
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import java.net.InetAddress
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import java.security.SecureRandom
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import java.util.*
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import kotlin.experimental.and
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class UUIDGenerator {
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private var midValue: String? = null
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private var seeder: SecureRandom? = null
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init {
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midValue = null
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seeder = null
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val buffer = StringBuffer(16)
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buffer.append(midValueStatic)
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buffer.append(toHex(System.identityHashCode(this), 8))
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midValue = buffer.toString()
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seeder = SecureRandom()
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seeder!!.nextInt()
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}
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fun generate(): String {
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val uid = StringBuffer(32)
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val currentTimeMillis = System.currentTimeMillis()
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uid.append(toHex((currentTimeMillis and -1L).toInt(), 8))
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uid.append(midValue)
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uid.append(toHex(seeder!!.nextInt(), 8))
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return uid.toString()
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}
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companion object {
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private val log = LogFactory.getLog(UUIDGenerator::class.java)
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private var seederStatic: SecureRandom? = null
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private var addr: ByteArray? = null
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private var midValueStatic: String? = null
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private var prevMillis = 0L
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private var addrBytes: ByteArray? = null
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init {
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seederStatic = null
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addr = null
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try {
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addr = InetAddress.getLocalHost().address
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addrBytes = InetAddress.getLocalHost().address
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val buffer = StringBuffer(8)
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buffer.append(toHex(toInt(addr!!), 8))
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midValueStatic = buffer.toString()
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seederStatic = SecureRandom()
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seederStatic!!.nextInt()
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} catch (ex: Exception) {
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log.error("", ex)
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}
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}
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fun generate(obj: Any): String {
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val uid = StringBuffer(32)
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val currentTimeMillis = System.currentTimeMillis()
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uid.append(toHex((currentTimeMillis and -1L).toInt(), 8))
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uid.append(midValueStatic)
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uid.append(toHex(System.identityHashCode(obj), 8))
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uid.append(toHex(random, 8))
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return uid.toString()
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}
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fun generate16(obj: Any): String {
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val uid = StringBuffer(16)
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uid.append(toHex(System.identityHashCode(obj), 8))
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uid.append(toHex(random, 8))
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return uid.toString()
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}
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private fun toHex(value: Int, length: Int): String {
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var value = value
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val hexDigits = charArrayOf('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F')
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val buffer = StringBuffer(length)
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val shift = length - 1 shl 2
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var i = -1
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while (++i < length) {
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buffer.append(hexDigits[value shr shift and 0xf])
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value = value shl 4
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}
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return buffer.toString()
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}
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private fun toInt(bytes: ByteArray): Int {
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var value = 0
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var i = -1
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while (++i < bytes.size) {
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value = value shl 8
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value = value or bytes[i].toInt()
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}
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return value
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}
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private val random: Int
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@Synchronized get() = seederStatic!!.nextInt()
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private val systemTimeMillis: Long
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@Synchronized get() {
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val millis = System.currentTimeMillis()
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if (millis > prevMillis) {
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prevMillis = millis
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} else {
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prevMillis++
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}
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return prevMillis
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}
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val uniqueLong: Long
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get() {
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var l = systemTimeMillis
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l *= 1000L
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val b1 = (addrBytes!![3] and 0xff.toByte()).toLong()
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l += b1
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return java.lang.Long.valueOf(l)
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}
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var chars = arrayOf(
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"a",
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"b",
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"c",
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"d",
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"e",
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"f",
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"g",
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"h",
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"i",
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"j",
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"k",
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"l",
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"m",
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"n",
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"o",
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"p",
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"q",
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"r",
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"s",
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"t",
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"u",
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"v",
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"w",
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"x",
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"y",
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"z",
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"0",
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"1",
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"2",
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"3",
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"4",
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"5",
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"6",
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"7",
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"8",
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"9",
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"A",
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"B",
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"C",
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"D",
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"E",
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"F",
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"G",
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"H",
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"I",
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"J",
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"K",
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"L",
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"M",
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"N",
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"O",
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"P",
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"Q",
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"R",
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"S",
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"T",
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"U",
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"V",
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"W",
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"X",
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"Y",
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"Z"
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)
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/*
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* 长度为8位的UUID
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*/
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fun generateShortUUID(): String {
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val shortBuffer = StringBuffer()
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val uuid = UUID.randomUUID().toString().replace("-", "")
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for (i in 0..7) {
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val str = uuid.substring(i * 4, i * 4 + 4)
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val x = Integer.parseInt(str, 16)
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shortBuffer.append(chars[x % 0x3E])
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}
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return shortBuffer.toString()
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}
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/*
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* 长度为16位的UUID
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*/
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fun generate16ShortUUID(): String {
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val shortBuffer = StringBuffer()
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val uuid = UUID.randomUUID().toString().replace("-", "")
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for (i in 0..15) {
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val str = uuid.substring(i * 2, i * 2 + 2)
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val x = Integer.parseInt(str, 16)
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shortBuffer.append(chars[x % 0x3E])
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}
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return shortBuffer.toString()
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}
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/**
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* 长度为指定位数的UUID
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* @param uuidLength
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* @return
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*/
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fun generateUUID(uuidLength: Int): String {
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val shortBuffer = StringBuffer()
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val uuid = UUID.randomUUID().toString().replace("-", "")
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for (i in 0 until uuidLength) {
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val str = uuid.substring(i * 4, i * 4 + 4)
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val x = Integer.parseInt(str, 16)
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shortBuffer.append(chars[x % 0x3E])
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}
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return shortBuffer.toString()
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}
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}
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}
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