RFR: 8245095: Implementation of JEP 408: Simple Web Server [v5]

[Michael McMahon]

On Tue, 21 Sep 2021 14:09:54 GMT, Julia Boes <jboes at openjdk.org> wrote:

>> This change implements a simple web server that can be run on the command-line with `java -m jdk.httpserver`.
>> 
>> This is facilitated by adding an entry point for the `jdk.httpserver` module, an implementation class whose main method is run when the above command is executed. This is the first such module entry point in the JDK.
>> 
>> The server is a minimal HTTP server that serves the static files of a given directory, similar to existing alternatives on other platforms and convenient for testing, development, and debugging.
>> 
>> Additionally, a small API is introduced for programmatic creation and customization.
>> 
>> Testing: tier1-3.
>
> Julia Boes has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
> 
>  - Merge branch 'master' into simpleserver
>  - Merge remote-tracking branch 'origin/simpleserver' into simpleserver
>  - Merge branch 'master' into simpleserver
>  - refactor isHidden,isReadable,isSymlink checks and cleanup tests
>  - Merge branch 'master' into simpleserver
>  - check isHidden, isSymlink, isReadable for all path segments 
>  - add checks for all path segments
>  - Merge branch 'master' into componentcheck
>  - Merge branch 'master' into simpleserver
>  - improve output on startup
>  - ... and 6 more: https://git.openjdk.java.net/jdk/compare/6d91a3eb...fe059131

src/jdk.httpserver/share/classes/sun/net/httpserver/simpleserver/SimpleFileServerImpl.java line 135:

> 133:             var socketAddr = new InetSocketAddress(addr, port);
> 134:             var server = SimpleFileServer.createFileServer(socketAddr, root, outputLevel);
> 135:             server.setExecutor(Executors.newSingleThreadExecutor());

I think this code has the effect of creating one thread for the selector and a second one for the execution of the handlers. If we want to keep thread usage to an absolute minimum then it might be better to not set an executor. Then, the selector thread executes the handlers as well.

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PR: https://git.openjdk.java.net/jdk/pull/5505