src/java.net.http/share/classes/java/net/http/internal/common/Demand.java
branchhttp-client-branch
changeset 56092 fd85b2bf2b0d
parent 56091 aedd6133e7a0
child 56093 22d94c4a3641
--- a/src/java.net.http/share/classes/java/net/http/internal/common/Demand.java	Wed Feb 07 15:46:30 2018 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,116 +0,0 @@
-/*
- * Copyright (c) 2017, 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 java.net.http.internal.common;
-
-import java.util.concurrent.atomic.AtomicLong;
-
-/**
- * Encapsulates operations with demand (Reactive Streams).
- *
- * <p> Demand is the aggregated number of elements requested by a Subscriber
- * which is yet to be delivered (fulfilled) by the Publisher.
- */
-public final class Demand {
-
-    private final AtomicLong val = new AtomicLong();
-
-    /**
-     * Increases this demand by the specified positive value.
-     *
-     * @param n
-     *         increment {@code > 0}
-     *
-     * @return {@code true} iff prior to this operation this demand was fulfilled
-     */
-    public boolean increase(long n) {
-        if (n <= 0) {
-            throw new IllegalArgumentException(String.valueOf(n));
-        }
-        long prev = val.getAndAccumulate(n, (p, i) -> p + i < 0 ? Long.MAX_VALUE : p + i);
-        return prev == 0;
-    }
-
-    /**
-     * Tries to decrease this demand by the specified positive value.
-     *
-     * <p> The actual value this demand has been decreased by might be less than
-     * {@code n}, including {@code 0} (no decrease at all).
-     *
-     * @param n
-     *         decrement {@code > 0}
-     *
-     * @return a value {@code m} ({@code 0 <= m <= n}) this demand has been
-     *         actually decreased by
-     */
-    public long decreaseAndGet(long n) {
-        if (n <= 0) {
-            throw new IllegalArgumentException(String.valueOf(n));
-        }
-        long p, d;
-        do {
-            d = val.get();
-            p = Math.min(d, n);
-        } while (!val.compareAndSet(d, d - p));
-        return p;
-    }
-
-    /**
-     * Tries to decrease this demand by {@code 1}.
-     *
-     * @return {@code true} iff this demand has been decreased by {@code 1}
-     */
-    public boolean tryDecrement() {
-        return decreaseAndGet(1) == 1;
-    }
-
-    /**
-     * @return {@code true} iff there is no unfulfilled demand
-     */
-    public boolean isFulfilled() {
-        return val.get() == 0;
-    }
-
-    /**
-     * Resets this object to its initial state.
-     */
-    public void reset() {
-        val.set(0);
-    }
-
-    /**
-     * Returns the current value of this demand.
-     *
-     * @return the current value of this demand
-     */
-    public long get() {
-        return val.get();
-    }
-
-    @Override
-    public String toString() {
-        return String.valueOf(val.get());
-    }
-}