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Make AbstractResponseBodySubscriber.onSubscribe thread-safe 

When there are simultaneous invocations of onSubscribe, only the first one should succeed, the rest should cancel the provided subscriptions
This commit is contained in:
Violeta Georgieva 2016-06-29 10:23:38 +03:00
parent 11ed847aca
commit 0605c0f3be
1 changed files with 7 additions and 4 deletions
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11
spring-web-reactive/src/main/java/org/springframework/http/server/reactive/AbstractResponseBodySubscriber.java
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@ -18,6 +18,7 @@ package org.springframework.http.server.reactive;
import java.io.IOException;
import java.nio.channels.Channel;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicReference;
import javax.servlet.WriteListener;
@ -169,11 +170,13 @@ abstract class AbstractResponseBodySubscriber implements Subscriber<DataBuffer>
@Override
void onSubscribe(AbstractResponseBodySubscriber subscriber,
Subscription subscription) {
if (BackpressureUtils.validate(subscriber.subscription, subscription)) {
Objects.requireNonNull(subscription, "Subscription cannot be null");
if (subscriber.changeState(this, REQUESTED)) {
subscriber.subscription = subscription;
if (subscriber.changeState(this, REQUESTED)) {
subscription.request(1);
}
subscription.request(1);
}
else {
super.onSubscribe(subscriber, subscription);
}
}
},