RFR 8191494: Refresh the incubating Http Client

[Daniel Fuchs]

Hi Chris,

Thanks for refreshing the webrev with our internal feedback.

I believe there are still some cleanup we could do to
wean out some more dead code (for instance I believe
ExceptionallyCloseable though implemented - is not
really used anywhere).

There are also some files that contain some commented out
code that could be cleaned up (e.g. HeaderParser.java,
Http1Request.java, Http2Connection.java, SSLDelegate.java)

Http2Connection.java:
Obsolete comments can be removed:
  212     // only keep a strong reference to Http2ClientImpl, which only has
  213     // a weak reference on HttpClientImpl, to avoid strong references
  214     // from the selector thread to HttpClientImpl (via attachments).


These are mostly nit but I think we should at least delete
the obsolete commented out method from Http2Connection as
there are too many of them and some of these are confusing.

Also your webrev is missing a recent change I pushed to add
copyright headers to policy files, as well as some minor
other fixes, hopefully you'll be able to take that in before
integrating.

best regards,

-- daniel

On 24/11/2017 17:05, Chris Hegarty wrote:
> Just an update on this.
> 
> There have been many review comments, off line, that have resulted in
> changes pushed to the sandbox, so I've refreshed the webrev at the
> same location.
> 
> http://cr.openjdk.java.net/~chegar/http_client_sandbox_8191494/
> 
> -Chris.
> 
> On 17/11/17 18:31, Chris Hegarty wrote:
>> Work on the incubating HTTP Client has been ongoing in the 
>> `http-client-branch` of the JDK sandbox [1] ( and previously in the 
>> JDK 10 sandbox [2] ). This issue proposes to take a snapshot of that 
>> work so as to refresh the version in the JDK mainline. As of now the 
>> mainline that corresponds to JDK 10.
>>
>> While incubating in JDK 9, the implementation has been almost 
>> completely rewritten over in the sandbox. The implementation is now 
>> complete asynchronous ( previously HTTP/1.1 has a blocking 
>> implementation ). Use of the RX Flow concept been pushed down into the 
>> implementation. This eliminates much of the original custom concepts 
>> to support HTTP/2. The "flow" of data can now be more easily traced 
>> from the user-level request publishers and response subscribers, all 
>> the way down to the underlying socket. This significantly reduces the 
>> number of concepts and complexity in the code, and maximizes the 
>> possibility of reuse between HTTP/1.1 and HTTP/2.
>>
>> As the API is still incubating, there have been some API tweaks. 
>> Mainly renaming ( request & response body processors are now request 
>> publisher and response subscriber ), minor spec clarifications around 
>> exceptions, a general tidy up and changes to address a number of 
>> external feedback items. Additionally, much work has been done on 
>> increasing test coverage and stabilization of the tests themselves.
>>
>> http://cr.openjdk.java.net/~chegar/http_client_sandbox_8191494/
>>
>> The webrev contains contributions from Chris Hegarty, Daniel Fuchs 
>> Michael McMahon, and Pavel Rappo. As can be seen from the sandbox 
>> history, review of the code has been effectively ongoing as the code 
>> has evolved, but nonetheless I'm sure it will benefit from further 
>> review.
>>
>> -Chris.
>>
>> [1] hg clone http://hg.openjdk.java.net/jdk/sandbox; cd sandbox; hg 
>> update http-client-branch
>> [2] http://hg.openjdk.java.net/jdk10/sandbox/