--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/PullPublisher.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 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 java.util.Iterator;
+import java.util.concurrent.Flow;
+
+/**
+ * A Publisher that is expected to run in same thread as subscriber.
+ * Items are obtained from Iterable. Each new subscription gets a new Iterator.
+ */
+class PullPublisher<T> implements Flow.Publisher<T> {
+
+    private final Iterable<T> iterable;
+
+    PullPublisher(Iterable<T> iterable) {
+        this.iterable = iterable;
+    }
+
+    @Override
+    public void subscribe(Flow.Subscriber<? super T> subscriber) {
+        subscriber.onSubscribe(new Subscription(subscriber, iterable.iterator()));
+    }
+
+    private class Subscription implements Flow.Subscription {
+
+        private final Flow.Subscriber<? super T> subscriber;
+        private final Iterator<T> iter;
+        private boolean done = false;
+        private long demand = 0;
+        private int recursion = 0;
+
+        Subscription(Flow.Subscriber<? super T> subscriber, Iterator<T> iter) {
+            this.subscriber = subscriber;
+            this.iter = iter;
+        }
+
+        @Override
+        public void request(long n) {
+            if (done) {
+                subscriber.onError(new IllegalArgumentException("request(" + n + ")"));
+            }
+            demand += n;
+            recursion ++;
+            if (recursion > 1) {
+                return;
+            }
+            while (demand > 0) {
+                done = !iter.hasNext();
+                if (done) {
+                    subscriber.onComplete();
+                    recursion --;
+                    return;
+                }
+                subscriber.onNext(iter.next());
+                demand --;
+            }
+        }
+
+        @Override
+        public void cancel() {
+            done = true;
+        }
+
+    }
+}