RFR: 8087124 HTTP/2 implementation

[Michael McMahon]

On 07/04/16 14:19, Simone Bordet wrote:
> Hi,
>
> On Wed, Apr 6, 2016 at 4:08 PM, Michael McMahon
> <michael.x.mcmahon at oracle.com> wrote:
>> Hi,
>>
>> This is the webrev for the HTTP/2 part of JEP 110.
>>
>> http://cr.openjdk.java.net/~michaelm/8087124/webrev.1/index.html
> Before I dive further into this, seems to me that the implementation
> is blocking; not the API which are protected via dispatches to other
> threads (that then block), but the I/O.
> Is this deliberate ? I was under the impression the HTTP client wanted
> to be non-blocking at its core ?
>
At the lowest level the implementation uses two threads per TCP 
connection, one
for reading and one for writing. I do plan to change that to dispatch 
from the selector
and execute the reads and writes asynchronously. It's not a particularly 
big change,
but would prefer to do it after the first integration of this code.

The Stream layer above this behaves much the same as in Http/1.1. where it
uses a single thread invocation for sending each request body and 
receiving each
response body. So, it's not exactly blocking. Nor is it entirely 
asynchronous/non blocking.

- Michael