--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/httpclient/http2/server/Queue.java	Fri Nov 10 16:24:07 2017 +0300
@@ -0,0 +1,177 @@
+/*
+ * 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.
+ */
+
+import jdk.incubator.http.internal.common.ExceptionallyCloseable;
+
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.stream.Stream;
+
+// Each stream has one of these for input. Each Http2Connection has one
+// for output. Can be used blocking or asynchronously.
+
+public class Queue<T> implements ExceptionallyCloseable {
+
+    private final LinkedList<T> q = new LinkedList<>();
+    private volatile boolean closed = false;
+    private volatile Throwable exception = null;
+    private Runnable callback;
+    private boolean callbackDisabled = false;
+    private int waiters; // true if someone waiting
+
+    public synchronized int size() {
+        return q.size();
+    }
+
+//    public synchronized boolean tryPut(T obj) throws IOException {
+//        if (closed) return false;
+//        put(obj);
+//        return true;
+//    }
+
+    public synchronized void put(T obj) throws IOException {
+        if (closed) {
+            throw new IOException("stream closed");
+        }
+
+        q.add(obj);
+
+        if (waiters > 0) {
+            notifyAll();
+        }
+
+        if (callbackDisabled) {
+            return;
+        }
+
+        if (q.size() > 0 && callback != null) {
+            // Note: calling callback while holding the lock is
+            // dangerous and may lead to deadlocks.
+            callback.run();
+        }
+    }
+
+//    public synchronized void disableCallback() {
+//        callbackDisabled = true;
+//    }
+
+//    public synchronized void enableCallback() {
+//        callbackDisabled = false;
+//        while (q.size() > 0) {
+//            callback.run();
+//        }
+//    }
+
+//    /**
+//     * callback is invoked any time put is called where
+//     * the Queue was empty.
+//     */
+//    public synchronized void registerPutCallback(Runnable callback) {
+//        Objects.requireNonNull(callback);
+//        this.callback = callback;
+//        if (q.size() > 0) {
+//            // Note: calling callback while holding the lock is
+//            // dangerous and may lead to deadlocks.
+//            callback.run();
+//        }
+//    }
+
+    @Override
+    public synchronized void close() {
+        closed = true;
+        notifyAll();
+    }
+
+    @Override
+    public synchronized void closeExceptionally(Throwable t) {
+        if (exception == null) exception = t;
+        else if (t != null && t != exception) {
+            if (!Stream.of(exception.getSuppressed())
+                .filter(x -> x == t)
+                .findFirst()
+                .isPresent())
+            {
+                exception.addSuppressed(t);
+            }
+        }
+        close();
+    }
+
+    public synchronized T take() throws IOException {
+        if (closed) {
+            throw newIOException("stream closed");
+        }
+        try {
+            while (q.size() == 0) {
+                waiters++;
+                wait();
+                if (closed) {
+                    throw newIOException("Queue closed");
+                }
+                waiters--;
+            }
+            return q.removeFirst();
+        } catch (InterruptedException ex) {
+            throw new IOException(ex);
+        }
+    }
+
+    public synchronized T poll() throws IOException {
+        if (closed) {
+            throw newIOException("stream closed");
+        }
+
+        if (q.isEmpty()) {
+            return null;
+        }
+        T res = q.removeFirst();
+        return res;
+    }
+
+//    public synchronized T[] pollAll(T[] type) throws IOException {
+//        T[] ret = q.toArray(type);
+//        q.clear();
+//        return ret;
+//    }
+
+//    public synchronized void pushback(T v) {
+//        q.addFirst(v);
+//    }
+
+//    public synchronized void pushbackAll(T[] v) {
+//        for (int i=v.length-1; i>=0; i--) {
+//            q.addFirst(v[i]);
+//        }
+//    }
+
+    private IOException newIOException(String msg) {
+        if (exception == null) {
+            return new IOException(msg);
+        } else {
+            return new IOException(msg, exception);
+        }
+    }
+
+}