--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/TimeoutEvent.java	Tue Apr 17 08:54:17 2018 -0700
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2015, 2018, 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.internal.net.http;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * Timeout event notified by selector thread. Executes the given handler if
+ * the timer not canceled first.
+ *
+ * Register with {@link HttpClientImpl#registerTimer(TimeoutEvent)}.
+ *
+ * Cancel with {@link HttpClientImpl#cancelTimer(TimeoutEvent)}.
+ */
+abstract class TimeoutEvent implements Comparable<TimeoutEvent> {
+
+    private static final AtomicLong COUNTER = new AtomicLong();
+    // we use id in compareTo to make compareTo consistent with equals
+    // see TimeoutEvent::compareTo below;
+    private final long id = COUNTER.incrementAndGet();
+    private final Instant deadline;
+
+    TimeoutEvent(Duration duration) {
+        deadline = Instant.now().plus(duration);
+    }
+
+    public abstract void handle();
+
+    public Instant deadline() {
+        return deadline;
+    }
+
+    @Override
+    public int compareTo(TimeoutEvent other) {
+        if (other == this) return 0;
+        // if two events have the same deadline, but are not equals, then the
+        // smaller is the one that was created before (has the smaller id).
+        // This is arbitrary and we don't really care which is smaller or
+        // greater, but we need a total order, so two events with the
+        // same deadline cannot compare == 0 if they are not equals.
+        final int compareDeadline = this.deadline.compareTo(other.deadline);
+        if (compareDeadline == 0 && !this.equals(other)) {
+            long diff = this.id - other.id; // should take care of wrap around
+            if (diff < 0) return -1;
+            else if (diff > 0) return 1;
+            else assert false : "Different events with same id and deadline";
+        }
+        return compareDeadline;
+    }
+
+    @Override
+    public String toString() {
+        return "TimeoutEvent[id=" + id + ", deadline=" + deadline + "]";
+    }
+}