src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/PseudoPublisher.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/PseudoPublisher.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,80 @@
+/*
+ * 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.concurrent.Flow;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+// Completes the subscription on first request. Never calls onNext()
+
+class PseudoPublisher<T> implements Flow.Publisher<T> {
+
+ private final Throwable throwable;
+
+ PseudoPublisher() {
+ this(null);
+ }
+
+ PseudoPublisher(Throwable throwable) {
+ this.throwable = throwable;
+ }
+
+ @Override
+ public void subscribe(Flow.Subscriber<? super T> subscriber) {
+ subscriber.onSubscribe(new Subscription(subscriber));
+ }
+
+ private class Subscription implements Flow.Subscription {
+
+ private final Flow.Subscriber<? super T> subscriber;
+ private final AtomicBoolean done = new AtomicBoolean();
+
+ Subscription(Flow.Subscriber<? super T> subscriber) {
+ this.subscriber = subscriber;
+ }
+
+ @Override
+ public void request(long n) {
+ if (done.compareAndSet(false, true)) {
+ if (n > 0) {
+ if (throwable == null) {
+ subscriber.onComplete();
+ } else {
+ subscriber.onError(throwable);
+ }
+ } else {
+ subscriber.onError(new IllegalArgumentException("request(" + n + ")"));
+ }
+ }
+ }
+
+ @Override
+ public void cancel() {
+ done.set(true);
+ }
+
+ }
+}