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diff --git a/src/java/nginx/unit/websocket/AsyncChannelWrapper.java b/src/java/nginx/unit/websocket/AsyncChannelWrapper.java
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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package nginx.unit.websocket;
+
+import java.nio.ByteBuffer;
+import java.nio.channels.CompletionHandler;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import javax.net.ssl.SSLException;
+
+/**
+ * This is a wrapper for a {@link java.nio.channels.AsynchronousSocketChannel}
+ * that limits the methods available thereby simplifying the process of
+ * implementing SSL/TLS support since there are fewer methods to intercept.
+ */
+public interface AsyncChannelWrapper {
+
+    Future<Integer> read(ByteBuffer dst);
+
+    <B,A extends B> void read(ByteBuffer dst, A attachment,
+            CompletionHandler<Integer,B> handler);
+
+    Future<Integer> write(ByteBuffer src);
+
+    <B,A extends B> void write(ByteBuffer[] srcs, int offset, int length,
+            long timeout, TimeUnit unit, A attachment,
+            CompletionHandler<Long,B> handler);
+
+    void close();
+
+    Future<Void> handshake() throws SSLException;
+}