diff --git a/src/org/redkale/net/AsyncConnection2.java b/src/org/redkale/net/AsyncConnection2.java
new file mode 100644
index 000000000..469d29a71
--- /dev/null
+++ b/src/org/redkale/net/AsyncConnection2.java
@@ -0,0 +1,365 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.redkale.net;
+
+import java.io.IOException;
+import java.net.*;
+import java.nio.ByteBuffer;
+import java.nio.channels.*;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.*;
+import java.util.function.*;
+import javax.net.ssl.SSLContext;
+
+/**
+ *
+ * <p>
+ * 详情见: https://redkale.org
+ *
+ * @author zhangjx
+ */
+public abstract class AsyncConnection2 implements ReadableByteChannel, WritableByteChannel, AutoCloseable {
+
+    protected SSLContext sslContext;
+
+    protected Map<String, Object> attributes; //用于存储绑定在Connection上的对象集合
+
+    protected Object subobject; //用于存储绑定在Connection上的对象， 同attributes， 只绑定单个对象时尽量使用subobject而非attributes
+
+    protected volatile long readtime;
+
+    protected volatile long writetime;
+
+    protected final Supplier<ByteBuffer> bufferSupplier;
+
+    protected final Consumer<ByteBuffer> bufferConsumer;
+
+    protected ByteBuffer readBuffer;
+
+    //在线数
+    protected AtomicLong livingCounter;
+
+    //关闭数
+    protected AtomicLong closedCounter;
+
+    protected Consumer<AsyncConnection2> beforeCloseListener;
+
+    //关联的事件数， 小于1表示没有事件
+    protected final AtomicInteger eventing = new AtomicInteger();
+
+    protected AsyncConnection2(Supplier<ByteBuffer> bufferSupplier, Consumer<ByteBuffer> bufferConsumer) {
+        Objects.requireNonNull(bufferSupplier);
+        Objects.requireNonNull(bufferConsumer);
+        this.bufferSupplier = bufferSupplier;
+        this.bufferConsumer = bufferConsumer;
+    }
+
+    public final long getLastReadTime() {
+        return readtime;
+    }
+
+    public final long getLastWriteTime() {
+        return writetime;
+    }
+
+    public final int increEventing() {
+        return eventing.incrementAndGet();
+    }
+
+    public final int decreEventing() {
+        return eventing.decrementAndGet();
+    }
+
+    @Override
+    public abstract boolean isOpen();
+
+    public abstract boolean isTCP();
+
+    public abstract boolean shutdownInput();
+
+    public abstract boolean shutdownOutput();
+
+    public abstract <T> boolean setOption(SocketOption<T> name, T value);
+
+    public abstract Set<SocketOption<?>> supportedOptions();
+
+    public abstract SocketAddress getRemoteAddress();
+
+    public abstract SocketAddress getLocalAddress();
+
+    public abstract int getReadTimeoutSeconds();
+
+    public abstract int getWriteTimeoutSeconds();
+
+    public abstract void setReadTimeoutSeconds(int readTimeoutSeconds);
+
+    public abstract void setWriteTimeoutSeconds(int writeTimeoutSeconds);
+
+    @Override
+    public abstract int read(ByteBuffer dst) throws IOException;
+
+    public abstract void read(CompletionHandler<Integer, ByteBuffer> handler);
+
+    public abstract void read(long timeout, TimeUnit unit, CompletionHandler<Integer, ByteBuffer> handler);
+
+    @Override
+    public abstract int write(ByteBuffer src) throws IOException;
+
+    public abstract <A> void write(ByteBuffer src, A attachment, CompletionHandler<Integer, ? super A> handler);
+
+    public final <A> void write(ByteBuffer[] srcs, A attachment, CompletionHandler<Integer, ? super A> handler) {
+        write(srcs, 0, srcs.length, attachment, handler);
+    }
+
+    public abstract <A> void write(ByteBuffer[] srcs, int offset, int length, A attachment, CompletionHandler<Integer, ? super A> handler);
+
+    public void setReadBuffer(ByteBuffer buffer) {
+        if (this.readBuffer != null) throw new RuntimeException("repeat AsyncConnection.currentReadBuffer");
+        this.readBuffer = buffer;
+    }
+
+    public ByteBuffer pollReadBuffer() {
+        ByteBuffer rs = this.readBuffer;
+        if (rs != null) {
+            this.readBuffer = null;
+            return rs;
+        }
+        return bufferSupplier.get();
+    }
+
+    public void offerReadBuffer(ByteBuffer buffer) {
+        if (buffer == null) return;
+        bufferConsumer.accept(buffer);
+    }
+
+    public void offerReadBuffer(ByteBuffer... buffers) {
+        if (buffers == null) return;
+        for (ByteBuffer buffer : buffers) {
+            bufferConsumer.accept(buffer);
+        }
+    }
+
+    public ByteBuffer pollWriteBuffer() {
+        return bufferSupplier.get();
+    }
+
+    public void offerWriteBuffer(ByteBuffer buffer) {
+        if (buffer == null) return;
+        bufferConsumer.accept(buffer);
+    }
+
+    public void offerWriteBuffer(ByteBuffer... buffers) {
+        if (buffers == null) return;
+        for (ByteBuffer buffer : buffers) {
+            bufferConsumer.accept(buffer);
+        }
+    }
+
+    public void dispose() {//同close， 只是去掉throws IOException
+        try {
+            this.close();
+        } catch (IOException io) {
+        }
+    }
+
+    public AsyncConnection2 beforeCloseListener(Consumer<AsyncConnection2> beforeCloseListener) {
+        this.beforeCloseListener = beforeCloseListener;
+        return this;
+    }
+
+    @Override
+    public void close() throws IOException {
+        if (closedCounter != null) {
+            closedCounter.incrementAndGet();
+            closedCounter = null;
+        }
+        if (livingCounter != null) {
+            livingCounter.decrementAndGet();
+            livingCounter = null;
+        }
+        if (beforeCloseListener != null) {
+            try {
+                beforeCloseListener.accept(this);
+            } catch (Exception io) {
+            }
+        }
+        if (this.readBuffer != null) {
+            bufferConsumer.accept(this.readBuffer);
+        }
+        if (attributes == null) return;
+        try {
+            for (Object obj : attributes.values()) {
+                if (obj instanceof AutoCloseable) ((AutoCloseable) obj).close();
+            }
+        } catch (Exception io) {
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public final <T> T getSubobject() {
+        return (T) this.subobject;
+    }
+
+    public void setSubobject(Object value) {
+        this.subobject = value;
+    }
+
+    public void setAttribute(String name, Object value) {
+        if (this.attributes == null) this.attributes = new HashMap<>();
+        this.attributes.put(name, value);
+    }
+
+    @SuppressWarnings("unchecked")
+    public final <T> T getAttribute(String name) {
+        return (T) (this.attributes == null ? null : this.attributes.get(name));
+    }
+
+    public final void removeAttribute(String name) {
+        if (this.attributes != null) this.attributes.remove(name);
+    }
+
+    public final Map<String, Object> getAttributes() {
+        return this.attributes;
+    }
+
+    public final void clearAttribute() {
+        if (this.attributes != null) this.attributes.clear();
+    }
+
+    //------------------------------------------------------------------------------------------------------------------------------
+    /**
+     * 创建TCP协议客户端连接
+     *
+     * @param address             连接点子
+     * @param group               连接AsynchronousChannelGroup
+     * @param readTimeoutSeconds  读取超时秒数
+     * @param writeTimeoutSeconds 写入超时秒数
+     *
+     * @return 连接CompletableFuture
+     */
+    public static CompletableFuture<AsyncConnection> createTCP(final AsynchronousChannelGroup group, final SocketAddress address,
+        final int readTimeoutSeconds, final int writeTimeoutSeconds) {
+        return createTCP(group, null, address, readTimeoutSeconds, writeTimeoutSeconds);
+    }
+
+    /**
+     * 创建TCP协议客户端连接
+     *
+     * @param address             连接点子
+     * @param sslContext          SSLContext
+     * @param group               连接AsynchronousChannelGroup
+     * @param readTimeoutSeconds  读取超时秒数
+     * @param writeTimeoutSeconds 写入超时秒数
+     *
+     * @return 连接CompletableFuture
+     */
+    public static CompletableFuture<AsyncConnection> createTCP(final AsynchronousChannelGroup group, final SSLContext sslContext,
+        final SocketAddress address, final int readTimeoutSeconds, final int writeTimeoutSeconds) {
+        final CompletableFuture<AsyncConnection> future = new CompletableFuture<>();
+        try {
+            final AsynchronousSocketChannel channel = AsynchronousSocketChannel.open(group);
+            try {
+                channel.setOption(StandardSocketOptions.TCP_NODELAY, true);
+                channel.setOption(StandardSocketOptions.SO_KEEPALIVE, true);
+                channel.setOption(StandardSocketOptions.SO_REUSEADDR, true);
+            } catch (IOException e) {
+            }
+            channel.connect(address, null, new CompletionHandler<Void, Void>() {
+                @Override
+                public void completed(Void result, Void attachment) {
+                    future.complete(create(channel, sslContext, address, readTimeoutSeconds, writeTimeoutSeconds));
+                }
+
+                @Override
+                public void failed(Throwable exc, Void attachment) {
+                    future.completeExceptionally(exc);
+                }
+            });
+        } catch (IOException e) {
+            future.completeExceptionally(e);
+        }
+        return future;
+    }
+
+    /**
+     * 通常用于 ssl socket
+     *
+     * @param socket Socket对象
+     *
+     * @return 连接对象
+     */
+    public static AsyncConnection create(final Socket socket) {
+        return create(socket, null, 0, 0);
+    }
+
+    public static AsyncConnection create(final Socket socket, final SocketAddress addr0, final int readTimeoutSecond0, final int writeTimeoutSecond0) {
+        return new TcpBioAsyncConnection(socket, addr0, readTimeoutSecond0, writeTimeoutSecond0, null, null);
+    }
+
+    public static AsyncConnection create(final Socket socket, final SocketAddress addr0, final int readTimeoutSecond0,
+        final int writeTimeoutSecond0, final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new TcpBioAsyncConnection(socket, addr0, readTimeoutSecond0, writeTimeoutSecond0, livingCounter, closedCounter);
+    }
+
+    public static AsyncConnection create(final SocketChannel ch, SocketAddress addr, final Selector selector,
+        final int readTimeoutSeconds0, final int writeTimeoutSeconds0) {
+        return new TcpNioAsyncConnection(ch, addr, selector, readTimeoutSeconds0, writeTimeoutSeconds0, null, null);
+    }
+
+    public static AsyncConnection create(final SocketChannel ch, final SocketAddress addr0, final Selector selector, final Context context) {
+        return new TcpNioAsyncConnection(ch, addr0, selector, context.readTimeoutSeconds, context.writeTimeoutSeconds, null, null);
+    }
+
+    public static AsyncConnection create(final SocketChannel ch, SocketAddress addr, final Selector selector,
+        final int readTimeoutSeconds0, final int writeTimeoutSeconds0,
+        final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new TcpNioAsyncConnection(ch, addr, selector, readTimeoutSeconds0, writeTimeoutSeconds0, livingCounter, closedCounter);
+    }
+
+    public static AsyncConnection create(final DatagramChannel ch, SocketAddress addr,
+        final boolean client0, final int readTimeoutSeconds0, final int writeTimeoutSeconds0) {
+        return new UdpBioAsyncConnection(ch, addr, client0, readTimeoutSeconds0, writeTimeoutSeconds0, null, null);
+    }
+
+    public static AsyncConnection create(final DatagramChannel ch, SocketAddress addr,
+        final boolean client0, final int readTimeoutSeconds0, final int writeTimeoutSeconds0,
+        final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new UdpBioAsyncConnection(ch, addr, client0, readTimeoutSeconds0, writeTimeoutSeconds0, livingCounter, closedCounter);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch) {
+        return create(ch, null, 0, 0);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, final SocketAddress addr0, final int readTimeoutSeconds, final int writeTimeoutSeconds) {
+        return new TcpAioAsyncConnection(ch, null, addr0, readTimeoutSeconds, writeTimeoutSeconds, null, null);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, SSLContext sslContext, final SocketAddress addr0, final int readTimeoutSeconds, final int writeTimeoutSeconds) {
+        return new TcpAioAsyncConnection(ch, sslContext, addr0, readTimeoutSeconds, writeTimeoutSeconds, null, null);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, final SocketAddress addr0, final Context context) {
+        return new TcpAioAsyncConnection(ch, context.sslContext, addr0, context.readTimeoutSeconds, context.writeTimeoutSeconds, null, null);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, final SocketAddress addr0, final int readTimeoutSeconds,
+        final int writeTimeoutSeconds, final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new TcpAioAsyncConnection(ch, null, addr0, readTimeoutSeconds, writeTimeoutSeconds, livingCounter, closedCounter);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, SSLContext sslContext, final SocketAddress addr0, final int readTimeoutSeconds,
+        final int writeTimeoutSeconds, final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new TcpAioAsyncConnection(ch, sslContext, addr0, readTimeoutSeconds, writeTimeoutSeconds, livingCounter, closedCounter);
+    }
+
+    public static AsyncConnection create(final AsynchronousSocketChannel ch, final SocketAddress addr0,
+        final Context context, final AtomicLong livingCounter, final AtomicLong closedCounter) {
+        return new TcpAioAsyncConnection(ch, context.sslContext, addr0, context.readTimeoutSeconds, context.writeTimeoutSeconds, livingCounter, closedCounter);
+    }
+
+}