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Copied getAndSub() over from Reactor

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Operators.getAndSub was removed in Reactor 3.0.1, this commit copies the
implementation over to AbstractRequestBodyPublisher, which used it.
This commit is contained in:
Arjen Poutsma
2016-09-01 11:16:01 +02:00
parent feb02f813e
commit 35cf4f173b
1 changed files with 24 additions and 1 deletions
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25
spring-web/src/main/java/org/springframework/http/server/reactive/AbstractRequestBodyPublisher.java
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@@ -106,7 +106,7 @@ abstract class AbstractRequestBodyPublisher implements Publisher<DataBuffer> {
while (hasDemand()) {
DataBuffer dataBuffer = read();
if (dataBuffer != null) {
Operators.getAndSub(this.demand, 1L);
getAndSub(this.demand, 1L);
this.subscriber.onNext(dataBuffer);
}
else {
@@ -116,6 +116,29 @@ abstract class AbstractRequestBodyPublisher implements Publisher<DataBuffer> {
return false;
}
/**
* Concurrent substraction bound to 0 and Long.MAX_VALUE.
* Any concurrent write will "happen" before this operation.
*
* @param sequence current atomic to update
* @param toSub delta to sub
* @return value before subscription, 0 or Long.MAX_VALUE
*/
private static long getAndSub(AtomicLong sequence, long toSub) {
long r;
long u;
do {
r = sequence.get();
if (r == 0 || r == Long.MAX_VALUE) {
return r;
}
u = Operators.subOrZero(r, toSub);
} while (!sequence.compareAndSet(r, u));
return r;
}
protected abstract void checkOnDataAvailable();
/**