diff --git a/AsyncSocket/build.gradle b/AsyncSocket/build.gradle
index 16e2921..c6107f7 100644
--- a/AsyncSocket/build.gradle
+++ b/AsyncSocket/build.gradle
@@ -2,5 +2,6 @@ dependencies {
     compile project(":")
 
     // kotlin 协程
-    compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.2.1'
+    compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9'
+    testRuntime group: 'org.jetbrains.kotlinx', name: 'kotlinx-coroutines-debug', version: '1.3.9'
 }
\ No newline at end of file
diff --git a/AsyncSocket/src/test/kotlin/cn/tursom/datagram/server/test.kt b/AsyncSocket/src/test/kotlin/cn/tursom/datagram/server/test.kt
index 3627a03..a3a73cb 100644
--- a/AsyncSocket/src/test/kotlin/cn/tursom/datagram/server/test.kt
+++ b/AsyncSocket/src/test/kotlin/cn/tursom/datagram/server/test.kt
@@ -4,6 +4,7 @@ import cn.tursom.channel.BufferedAsyncChannel
 import cn.tursom.core.log
 import cn.tursom.core.pool.DirectMemoryPool
 import cn.tursom.datagram.AsyncDatagramClient
+import cn.tursom.socket.NioClient
 import cn.tursom.socket.server.BuffedNioServer
 import kotlinx.coroutines.runBlocking
 
@@ -11,6 +12,7 @@ val echoHandler: suspend BufferedAsyncChannel.() -> Unit = {
   while (true) {
     val buffer = read()
     log("$this recv from client $remoteAddress: ${buffer.toString(buffer.readable)}")
+    Throwable().printStackTrace()
     write(buffer)
   }
 }
@@ -35,7 +37,7 @@ fun main() {
 
   runBlocking {
     val input = System.`in`.bufferedReader()
-    var client = AsyncDatagramClient.connect("127.0.0.1", port).getBuffed(pool)
+    var client = NioClient.connect("127.0.0.1", port).getBuffed(pool)
     while (true) {
       try {
         print(">>>")
diff --git a/build.gradle b/build.gradle
index 0bc736a..a846c3e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlinVersion = '1.3.72'
+    ext.kotlinVersion = '1.4.0'
 
     repositories {
         mavenLocal()
diff --git a/src/main/kotlin/cn/tursom/core/Tools.kt b/src/main/kotlin/cn/tursom/core/Tools.kt
index b01e46d..6746904 100644
--- a/src/main/kotlin/cn/tursom/core/Tools.kt
+++ b/src/main/kotlin/cn/tursom/core/Tools.kt
@@ -6,6 +6,7 @@ import sun.misc.Unsafe
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.lang.reflect.Field
+import java.lang.reflect.Method
 import java.lang.reflect.ParameterizedType
 import java.lang.reflect.Type
 import java.net.URLDecoder
@@ -406,3 +407,35 @@ fun <T, R> Iterable<T>.firstNotNull(selector: (T) -> R): R? {
   }
   return null
 }
+
+fun Class<*>.forAllMethods(action: (Method) -> Unit) {
+  var clazz = this
+  while (clazz != Any::class.java) {
+    clazz.declaredMethods.forEach(action)
+    clazz = clazz.superclass
+  }
+  clazz.declaredMethods.forEach(action)
+}
+
+private val BASE62_DIGITS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray()
+
+tailrec fun Long.base62(sBuilder: StringBuilder = StringBuilder()): String {
+  return if (this == 0L) {
+    sBuilder.reverse().toString()
+  } else {
+    val remainder = (this % 62).toInt()
+    sBuilder.append(BASE62_DIGITS[remainder])
+    (this / 62).base62(sBuilder)
+  }
+}
+
+fun String.base62Decode(): Long {
+  var sum: Long = 0
+  val len = length
+  var base = 62L
+  for (i in 0 until len) {
+    sum += BASE62_DIGITS.indexOf(this[len - i - 1]) * base
+    base *= 62
+  }
+  return sum
+}
diff --git a/utils/src/main/kotlin/cn/tursom/utils/Tools.kt b/utils/src/main/kotlin/cn/tursom/utils/Tools.kt
index 79a4fa2..8d7318d 100644
--- a/utils/src/main/kotlin/cn/tursom/utils/Tools.kt
+++ b/utils/src/main/kotlin/cn/tursom/utils/Tools.kt
@@ -2,15 +2,12 @@ package cn.tursom.utils
 
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
+import com.google.gson.reflect.TypeToken
 import kotlinx.coroutines.*
-import java.lang.reflect.InvocationHandler
-import java.lang.reflect.Method
-import java.lang.reflect.Proxy
 import java.util.concurrent.Executor
 import kotlin.coroutines.resume
 import kotlin.coroutines.resumeWithException
 import kotlin.coroutines.suspendCoroutine
-import kotlin.reflect.jvm.javaMethod
 
 @Suppress("unused", "SpellCheckingInspection")
 val gson = GsonBuilder()
@@ -25,9 +22,10 @@ val prettyGson = GsonBuilder()
 
 fun Any.toJson(): String = gson.toJson(this)
 fun Any.toPrettyJson(): String = prettyGson.toJson(this)
-inline fun <reified T : Any> String.fromJson(): T = gson.fromJson(this, T::class.java)
+//inline fun <reified T : Any> String.fromJson(): T = gson.fromJson(this, T::class.java)
 
-inline fun <reified T : Any> Gson.fromJson(json: String) = this.fromJson(json, T::class.java)!!
+inline fun <reified T : Any> Gson.fromJson(json: String) = this.fromJson<T>(json, object : TypeToken<T>() {}.type)
+inline fun <reified T : Any> String.fromJson(gson: Gson = cn.tursom.utils.gson) = gson.fromJson<T>(this, object : TypeToken<T>() {}.type)!!
 
 suspend fun <T> io(block: suspend CoroutineScope.() -> T): T {
   return withContext(Dispatchers.IO, block)