diff --git a/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/AbstractWebSocketHandler.kt b/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/AbstractWebSocketHandler.kt
index 495c8af..5073c66 100644
--- a/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/AbstractWebSocketHandler.kt
+++ b/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/AbstractWebSocketHandler.kt
@@ -6,32 +6,78 @@ import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame
 import io.netty.handler.codec.http.websocketx.PingWebSocketFrame
 import io.netty.handler.codec.http.websocketx.PongWebSocketFrame
 import io.netty.handler.codec.http.websocketx.TextWebSocketFrame
+import kotlin.reflect.KMutableProperty0
+import kotlin.reflect.KMutableProperty1
 
-@Suppress("unused")
+@Suppress("unused", "MemberVisibilityCanBePrivate", "NOTHING_TO_INLINE")
 open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHandler<T, H>> : WebSocketHandler<T, H> {
-  private var onOpen: ((client: T) -> Unit)? = null
+  inline fun <A1> addListener(
+    p: KMutableProperty0<((A1) -> Unit)?>,
+    crossinline newHandler: (A1) -> Unit,
+  ) {
+    val oldHandler = p.get()
+    p.set { a1: A1 ->
+      oldHandler?.invoke(a1)
+      newHandler(a1)
+    }
+  }
 
-  fun onOpen(onOpen: ((client: T) -> Unit)) {
+  inline fun <A1> addListener(
+    p: KMutableProperty1<AbstractWebSocketHandler<T, H>, ((A1) -> Unit)?>,
+    crossinline newHandler: (A1) -> Unit,
+  ) {
+    val oldHandler = p.get(this)
+    p.set(this) { a1: A1 ->
+      oldHandler?.invoke(a1)
+      newHandler(a1)
+    }
+  }
+
+  inline fun <A1, A2> addListener(
+    p: KMutableProperty0<((A1, A2) -> Unit)?>,
+    noinline newHandler: (A1, A2) -> Unit,
+  ) {
+    val oldHandler = p.get()
+    p.set { a1: A1, a2: A2 ->
+      oldHandler?.invoke(a1, a2)
+      newHandler(a1, a2)
+    }
+  }
+
+  inline fun <A1, A2> addListener(
+    p: KMutableProperty1<AbstractWebSocketHandler<T, H>, ((A1, A2) -> Unit)?>,
+    crossinline newHandler: (A1, A2) -> Unit,
+  ) {
+    val oldHandler = p.get(this)
+    p.set(this) { a1: A1, a2: A2 ->
+      oldHandler?.invoke(a1, a2)
+      newHandler(a1, a2)
+    }
+  }
+
+  var onOpen: ((client: T) -> Unit)? = null
+
+  fun onOpen(onOpen: ((client: T) -> Unit)?) {
     this.onOpen = onOpen
   }
 
   override fun onOpen(client: T) {
-    onOpen?.also { it(client) } ?: super.onOpen(client)
+    onOpen?.invoke(client)
   }
 
-  private var onClose: ((client: T) -> Unit)? = null
+  var onClose: ((client: T) -> Unit)? = null
 
-  fun onClose(onClose: ((client: T) -> Unit)) {
+  fun onClose(onClose: ((client: T) -> Unit)?) {
     this.onClose = onClose
   }
 
   override fun onClose(client: T) {
-    onClose?.also { it(client) } ?: super.onClose(client)
+    onClose?.invoke(client)
   }
 
-  private var onError: ((client: T, e: Throwable) -> Unit)? = null
+  var onError: ((client: T, e: Throwable) -> Unit)? = null
 
-  fun onError(onError: ((client: T, e: Throwable) -> Unit)) {
+  fun onError(onError: ((client: T, e: Throwable) -> Unit)?) {
     this.onError = onError
   }
 
@@ -39,7 +85,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     onError?.also { it(client, e) } ?: super.onError(client, e)
   }
 
-  private var readMessage1: ((client: T, msg: String) -> Unit)? = null
+  var readMessage1: ((client: T, msg: String) -> Unit)? = null
 
   @JvmName("readMessage1")
   fun readMessage(readMessage: (client: T, msg: String) -> Unit) {
@@ -50,7 +96,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage1?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readMessage2: ((client: T, msg: TextWebSocketFrame) -> Unit)? = null
+  var readMessage2: ((client: T, msg: TextWebSocketFrame) -> Unit)? = null
 
   @JvmName("readMessage2")
   fun readMessage(readMessage: (client: T, msg: TextWebSocketFrame) -> Unit) {
@@ -61,7 +107,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage2?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readMessage3: ((client: T, msg: ByteArray) -> Unit)? = null
+  var readMessage3: ((client: T, msg: ByteArray) -> Unit)? = null
 
   @JvmName("readMessage3")
   fun readMessage(readMessage: (client: T, msg: ByteArray) -> Unit) {
@@ -72,7 +118,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage3?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readMessage4: ((client: T, msg: ByteBuf) -> Unit)? = null
+  var readMessage4: ((client: T, msg: ByteBuf) -> Unit)? = null
 
   @JvmName("readMessage4")
   fun readMessage(readMessage: (client: T, msg: ByteBuf) -> Unit) {
@@ -83,7 +129,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage4?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readMessage5: ((client: T, msg: ByteBuffer) -> Unit)? = null
+  var readMessage5: ((client: T, msg: ByteBuffer) -> Unit)? = null
 
   @JvmName("readMessage5")
   fun readMessage(readMessage: (client: T, msg: ByteBuffer) -> Unit) {
@@ -94,7 +140,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage5?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readMessage6: ((client: T, msg: BinaryWebSocketFrame) -> Unit)? = null
+  var readMessage6: ((client: T, msg: BinaryWebSocketFrame) -> Unit)? = null
 
   @JvmName("readMessage6")
   fun readMessage(readMessage: (client: T, msg: BinaryWebSocketFrame) -> Unit) {
@@ -105,7 +151,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readMessage6?.also { it(client, msg) } ?: super.readMessage(client, msg)
   }
 
-  private var readPing1: ((client: T, msg: PingWebSocketFrame) -> Unit)? = null
+  var readPing1: ((client: T, msg: PingWebSocketFrame) -> Unit)? = null
 
   @JvmName("readPing1")
   fun readPing(readMessage: (client: T, msg: PingWebSocketFrame) -> Unit) {
@@ -116,7 +162,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPing1?.also { it(client, msg) } ?: super.readPing(client, msg)
   }
 
-  private var readPing2: ((client: T, msg: ByteBuf) -> Unit)? = null
+  var readPing2: ((client: T, msg: ByteBuf) -> Unit)? = null
 
   @JvmName("readPing2")
   fun readPing(readMessage: (client: T, msg: ByteBuf) -> Unit) {
@@ -127,7 +173,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPing2?.also { it(client, msg) } ?: super.readPing(client, msg)
   }
 
-  private var readPing3: ((client: T, msg: ByteBuffer) -> Unit)? = null
+  var readPing3: ((client: T, msg: ByteBuffer) -> Unit)? = null
 
   @JvmName("readPing3")
   fun readPing(readMessage: (client: T, msg: ByteBuffer) -> Unit) {
@@ -138,7 +184,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPing3?.also { it(client, msg) } ?: super.readPing(client, msg)
   }
 
-  private var readPing4: ((client: T, msg: ByteArray) -> Unit)? = null
+  var readPing4: ((client: T, msg: ByteArray) -> Unit)? = null
 
   @JvmName("readPing4")
   fun readPing(readMessage: (client: T, msg: ByteArray) -> Unit) {
@@ -149,7 +195,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPing4?.also { it(client, msg) } ?: super.readPing(client, msg)
   }
 
-  private var readPing5: ((client: T, msg: String) -> Unit)? = null
+  var readPing5: ((client: T, msg: String) -> Unit)? = null
 
   @JvmName("readPing5")
   fun readPing(readMessage: (client: T, msg: String) -> Unit) {
@@ -160,7 +206,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPing5?.also { it(client, msg) } ?: super.readPing(client, msg)
   }
 
-  private var readPong1: ((client: T, msg: PongWebSocketFrame) -> Unit)? = null
+  var readPong1: ((client: T, msg: PongWebSocketFrame) -> Unit)? = null
 
   @JvmName("readPong1")
   fun readPong(readMessage: (client: T, msg: PongWebSocketFrame) -> Unit) {
@@ -171,7 +217,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPong1?.also { it(client, msg) } ?: super.readPong(client, msg)
   }
 
-  private var readPong2: ((client: T, msg: ByteBuf) -> Unit)? = null
+  var readPong2: ((client: T, msg: ByteBuf) -> Unit)? = null
 
   @JvmName("readPong2")
   fun readPong(readMessage: (client: T, msg: ByteBuf) -> Unit) {
@@ -182,7 +228,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPong2?.also { it(client, msg) } ?: super.readPong(client, msg)
   }
 
-  private var readPong3: ((client: T, msg: ByteBuffer) -> Unit)? = null
+  var readPong3: ((client: T, msg: ByteBuffer) -> Unit)? = null
 
   @JvmName("readPong3")
   fun readPong(readMessage: (client: T, msg: ByteBuffer) -> Unit) {
@@ -193,7 +239,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPong3?.also { it(client, msg) } ?: super.readPong(client, msg)
   }
 
-  private var readPong4: ((client: T, msg: ByteArray) -> Unit)? = null
+  var readPong4: ((client: T, msg: ByteArray) -> Unit)? = null
 
   @JvmName("readPong4")
   fun readPong(readMessage: (client: T, msg: ByteArray) -> Unit) {
@@ -204,7 +250,7 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
     readPong4?.also { it(client, msg) } ?: super.readPong(client, msg)
   }
 
-  private var readPong5: ((client: T, msg: String) -> Unit)? = null
+  var readPong5: ((client: T, msg: String) -> Unit)? = null
 
   @JvmName("readPong5")
   fun readPong(readMessage: (client: T, msg: String) -> Unit) {
@@ -214,4 +260,4 @@ open class AbstractWebSocketHandler<T : WebSocketClient<T, H>, H : WebSocketHand
   override fun readPong(client: T, msg: String) {
     readPong5?.also { it(client, msg) } ?: super.readPong(client, msg)
   }
-}
\ No newline at end of file
+}
diff --git a/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/WebSocketClient.kt b/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/WebSocketClient.kt
index 218cd60..a3a7e22 100644
--- a/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/WebSocketClient.kt
+++ b/ts-core/ts-ws-client/src/main/kotlin/cn/tursom/core/ws/WebSocketClient.kt
@@ -3,7 +3,9 @@ package cn.tursom.core.ws
 import cn.tursom.core.ShutdownHook
 import cn.tursom.core.buffer.ByteBuffer
 import cn.tursom.core.buffer.impl.NettyByteBuffer
+import cn.tursom.core.notifyAll
 import cn.tursom.core.uncheckedCast
+import cn.tursom.core.wait
 import io.netty.bootstrap.Bootstrap
 import io.netty.buffer.ByteBuf
 import io.netty.buffer.Unpooled
@@ -20,6 +22,8 @@ import io.netty.handler.logging.LoggingHandler
 import io.netty.handler.ssl.SslContextBuilder
 import io.netty.handler.ssl.util.InsecureTrustManagerFactory
 import java.net.URI
+import java.util.concurrent.ThreadFactory
+import java.util.concurrent.atomic.AtomicInteger
 
 
 @Suppress("unused")
@@ -38,8 +42,11 @@ open class WebSocketClient<in T : WebSocketClient<T, H>, H : WebSocketHandler<T,
   private val uri: URI = URI.create(url)
   var ch: Channel? = null
     internal set
+  var closed: Boolean = false
+    private set
 
   init {
+    uncheckedCast<T>()
     ShutdownHook.addHook {
       close()
     }
@@ -82,7 +89,7 @@ open class WebSocketClient<in T : WebSocketClient<T, H>, H : WebSocketHandler<T,
     )
     val handler = WebSocketClientChannelHandler(uncheckedCast(), handler, autoRelease)
     val bootstrap = Bootstrap()
-    bootstrap.group(group)
+      .group(group)
       .channel(NioSocketChannel::class.java)
       .handler(object : ChannelInitializer<SocketChannel>() {
         override fun initChannel(ch: SocketChannel) {
@@ -196,12 +203,24 @@ open class WebSocketClient<in T : WebSocketClient<T, H>, H : WebSocketHandler<T,
   }
 
   open fun onOpen() {
+    closed = false
   }
 
   open fun onClose() {
+    closed = true
+    notifyAll { }
+  }
+
+  fun waitClose() {
+    if (!closed) wait { }
   }
 
   companion object {
-    val group: EventLoopGroup = NioEventLoopGroup()
+    private val threadId = AtomicInteger()
+    private val group: EventLoopGroup = NioEventLoopGroup(0, ThreadFactory {
+      val thread = Thread(it, "WebSocketClient-${threadId.incrementAndGet()}")
+      thread.isDaemon = true
+      thread
+    })
   }
 }