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stub: Document StreamObserver is an async API #8449

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merged 2 commits into from Aug 30, 2021
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stub: Document StreamObserver is an async API #8449

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stub: Document StreamObserver is an async API
ejona86 Aug 25, 2021
c663212
Talk about flow control, as it is the main cause for slow operations
ejona86 Aug 25, 2021
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5 changes: 5 additions & 0 deletions stub/src/main/java/io/grpc/stub/StreamObserver.java
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Expand Up @@ -31,6 +31,11 @@
* not need to be synchronized together; incoming and outgoing directions are independent.
* Since individual {@code StreamObserver}s are not thread-safe, if multiple threads will be
* writing to a {@code StreamObserver} concurrently, the application must synchronize calls.
*
* <p>This API is asynchronous, so methods may return before the operation completes. gRPC
* guarantees it does not block on I/O in its implementation, but applications are allowed to
* perform blocking operations in their implementations. However, doing so will delay other
* callbacks because the methods cannot be called concurrently.
*/
public interface StreamObserver<V> {
/**
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