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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.datastax.dse.driver.internal.core.cql.reactive;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.concurrent.atomic.AtomicLong;
public final class ReactiveOperators {
/**
* Atomically adds the given value to the given AtomicLong, bound to Long.MAX_VALUE.
*
* @param current the current value.
* @param toAdd the delta to add.
*/
public static void addCap(@NonNull AtomicLong current, long toAdd) {
long r, u;
do {
r = current.get();
if (r == Long.MAX_VALUE) {
return;
}
u = r + toAdd;
if (u < 0L) {
u = Long.MAX_VALUE;
}
} while (!current.compareAndSet(r, u));
}
/**
* Atomically subtracts the given value from the given AtomicLong, bound to 0.
*
* @param current the current value.
* @param toSub the delta to subtract.
*/
public static void subCap(@NonNull AtomicLong current, long toSub) {
long r, u;
do {
r = current.get();
if (r == 0 || r == Long.MAX_VALUE) {
return;
}
u = Math.max(r - toSub, 0);
} while (!current.compareAndSet(r, u));
}
}