author | michaelm |
Thu, 29 Mar 2018 17:14:17 +0100 | |
branch | http-client-branch |
changeset 56368 | c10279a27b41 |
parent 56264 | c012b93297b0 |
child 56399 | a0929d5dd63f |
permissions | -rw-r--r-- |
48083 | 1 |
/* |
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* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.internal.net.http.common; |
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import java.util.concurrent.Flow; |
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import java.util.concurrent.atomic.AtomicBoolean; |
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/** |
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* Maintains subscription counter and provides primitives for: |
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* - accessing window |
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* - reducing window when delivering items externally |
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* - resume delivery when window was zero previously |
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*/ |
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public class SubscriptionBase implements Flow.Subscription { |
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final Demand demand = new Demand(); |
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final SequentialScheduler scheduler; // when window was zero and is opened, run this |
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final Runnable cancelAction; // when subscription cancelled, run this |
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final AtomicBoolean cancelled; |
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public SubscriptionBase(SequentialScheduler scheduler, Runnable cancelAction) { |
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this.scheduler = scheduler; |
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this.cancelAction = cancelAction; |
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this.cancelled = new AtomicBoolean(false); |
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} |
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@Override |
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public void request(long n) { |
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if (demand.increase(n)) |
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scheduler.runOrSchedule(); |
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} |
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@Override |
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public synchronized String toString() { |
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return "SubscriptionBase: window = " + demand.get() + |
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" cancelled = " + cancelled.toString(); |
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} |
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/** |
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* Returns true if the window was reduced by 1. In that case |
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* items must be supplied to subscribers and the scheduler run |
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* externally. If the window could not be reduced by 1, then false |
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* is returned and the scheduler will run later when the window is updated. |
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*/ |
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public boolean tryDecrement() { |
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return demand.tryDecrement(); |
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} |
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public long window() { |
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return demand.get(); |
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} |
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@Override |
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public void cancel() { |
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if (cancelled.getAndSet(true)) |
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return; |
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scheduler.stop(); |
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cancelAction.run(); |
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} |
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} |