--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/httpclient/reactivestreams-tck/org/reactivestreams/Subscriber.java	Tue Jul 02 13:25:51 2019 +0100
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * 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 org.reactivestreams;
+
+/**
+ * Will receive call to {@link #onSubscribe(Subscription)} once after passing an instance of {@link Subscriber} to {@link Publisher#subscribe(Subscriber)}.
+ * <p>
+ * No further notifications will be received until {@link Subscription#request(long)} is called.
+ * <p>
+ * After signaling demand:
+ * <ul>
+ * <li>One or more invocations of {@link #onNext(Object)} up to the maximum number defined by {@link Subscription#request(long)}</li>
+ * <li>Single invocation of {@link #onError(Throwable)} or {@link Subscriber#onComplete()} which signals a terminal state after which no further events will be sent.
+ * </ul>
+ * <p>
+ * Demand can be signaled via {@link Subscription#request(long)} whenever the {@link Subscriber} instance is capable of handling more.
+ *
+ * @param <T> the type of element signaled.
+ */
+public interface Subscriber<T> {
+    /**
+     * Invoked after calling {@link Publisher#subscribe(Subscriber)}.
+     * <p>
+     * No data will start flowing until {@link Subscription#request(long)} is invoked.
+     * <p>
+     * It is the responsibility of this {@link Subscriber} instance to call {@link Subscription#request(long)} whenever more data is wanted.
+     * <p>
+     * The {@link Publisher} will send notifications only in response to {@link Subscription#request(long)}.
+     *
+     * @param s
+     *            {@link Subscription} that allows requesting data via {@link Subscription#request(long)}
+     */
+    public void onSubscribe(Subscription s);
+
+    /**
+     * Data notification sent by the {@link Publisher} in response to requests to {@link Subscription#request(long)}.
+     *
+     * @param t the element signaled
+     */
+    public void onNext(T t);
+
+    /**
+     * Failed terminal state.
+     * <p>
+     * No further events will be sent even if {@link Subscription#request(long)} is invoked again.
+     *
+     * @param t the throwable signaled
+     */
+    public void onError(Throwable t);
+
+    /**
+     * Successful terminal state.
+     * <p>
+     * No further events will be sent even if {@link Subscription#request(long)} is invoked again.
+     */
+    public void onComplete();
+}