--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/AsyncConnection.java	Fri Dec 09 11:35:02 2016 +0000
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.incubator.http;
+
+import jdk.incubator.http.internal.common.ByteBufferReference;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+/**
+ * Implemented by classes that offer an asynchronous interface.
+ *
+ * PlainHttpConnection, AsyncSSLConnection AsyncSSLDelegate.
+ *
+ * setAsyncCallbacks() is called to set the callback for reading
+ * and error notification. Reads all happen on the selector thread, which
+ * must not block.
+ *
+ * Writing uses the same write() methods as used in blocking mode.
+ * Queues are employed on the writing side to buffer data while it is waiting
+ * to be sent. This strategy relies on HTTP/2 protocol flow control to stop
+ * outgoing queue from continually growing. Writes can be initiated by the
+ * calling thread, but if socket becomes full then the queue is emptied by
+ * the selector thread
+ */
+interface AsyncConnection {
+
+    /**
+     * Enables asynchronous sending and receiving mode. The given async
+     * receiver will receive all incoming data. asyncInput() will be called
+     * to trigger reads. asyncOutput() will be called to drive writes.
+     *
+     * The errorReceiver callback must be called when any fatal exception
+     * occurs. Connection is assumed to be closed afterwards.
+     */
+    void setAsyncCallbacks(Consumer<ByteBufferReference> asyncReceiver,
+                           Consumer<Throwable> errorReceiver,
+                           Supplier<ByteBufferReference> readBufferSupplier);
+
+
+
+    /**
+     * Does whatever is required to start reading. Usually registers
+     * an event with the selector thread.
+     */
+    void startReading();
+
+    /**
+     * In async mode, this method puts buffers at the end of the send queue.
+     * When in async mode, calling this method should later be followed by
+     * subsequent flushAsync invocation.
+     * That allows multiple threads to put buffers into the queue while some other
+     * thread is writing.
+     */
+    void writeAsync(ByteBufferReference[] buffers) throws IOException;
+
+    /**
+     * In async mode, this method may put buffers at the beginning of send queue,
+     * breaking frames sequence and allowing to write these buffers before other
+     * buffers in the queue.
+     * When in async mode, calling this method should later be followed by
+     * subsequent flushAsync invocation.
+     * That allows multiple threads to put buffers into the queue while some other
+     * thread is writing.
+     */
+    void writeAsyncUnordered(ByteBufferReference[] buffers) throws IOException;
+
+    /**
+     * This method should be called after any writeAsync/writeAsyncUnordered
+     * invocation.
+     * If there is a race to flushAsync from several threads one thread
+     * (race winner) capture flush operation and write the whole queue content.
+     * Other threads (race losers) exits from the method (not blocking)
+     * and continue execution.
+     */
+    void flushAsync() throws IOException;
+
+}