| /* |
| * 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 Duration duration; |
| private final Instant deadline; |
| |
| TimeoutEvent(Duration duration) { |
| this.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 + ", duration=" + duration |
| + ", deadline=" + deadline + "]"; |
| } |
| } |