RFR: 8284585: PushPromiseContinuation test fails intermittently in timeout [v2]

[Conor Cleary]

On Thu, 5 May 2022 13:37:08 GMT, Conor Cleary <ccleary at openjdk.org> wrote:

>> **Issue**
>> A recent fix for [JDK-8263031](https://bugs.openjdk.java.net/browse/JDK-8263031), which addressed the httpclient being unable to properly process Http/2 PushPromise frames followed by continuations caused intermittent failures of the test. This was cause by two seperate problems. 
>> 
>> - Firstly, on the client side, `Http2Connection.processFrame` did not a check for whether or not a Continuation was to be expected early on in the method resulting in frames other than the expected Continuation Frame being incorrectly processed. In Http/2, when a Continuation Frame is expected, no other type of frame should be processed without a connection error of type PROTOCOL_ERROR being thrown.
>> - Secondly, `Http2TestConnection.handlePush` had no guards around response headers and data frames being sent before a continuation is sent which resulted in the intermittent nature of this timeout. 
>> 
>> **Proposed Solution**
>> The test class `OutgoingPushPromise` was modified to contain a list of Continuation Frames as required rather than the Continuations being scheduled to send in the test itself. This prevents the situation of unexpected frames being sent before a Continuation Frame was meant to arrive. 
>> 
>> In addition to the above, Http2Connection was modified to ensure that a connection error of type PROTOCOL_ERROR is thrown if a frame other than a Continuation arrives at the client unexpectedly.
>
> Conor Cleary has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8284585: New constructor & minor improvements

Seeking additonal review from any watchers if possible

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PR: https://git.openjdk.java.net/jdk/pull/8518