RFR: 8297822: De-duplicate code in module jdk.sctp [v4]

[Roger Riggs]

On Tue, 6 Dec 2022 14:04:17 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposes merging logic and optimising three classes that exist for aix, macos and windows.
>> 
>> Optimisation will reduce byte code. Below is an example for one of the many methods optimised.
>> 
>> Before:
>> 
>> public void implCloseSelectableChannel() throws java.io.IOException;
>>   Code:
>>      0: new           #7                  // class java/lang/UnsupportedOperationException
>>      3: dup
>>      4: ldc           #11                 // String SCTP not supported on this platform
>>      6: invokespecial #13                 // Method java/lang/UnsupportedOperationException."<init>":(Ljava/lang/String;)V
>>      9: athrow
>> 
>> 
>> After:
>> 
>> public void implCloseSelectableChannel() throws java.io.IOException;
>>   Code:
>>      0: invokestatic  #16                 // Method sun/nio/ch/sctp/UnsupportedUtil.sctpUnsupported:()Ljava/lang/UnsupportedOperationException;
>>      3: athrow
>
> Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
> 
>  - Remove UnsupportedUtil.java where not needed
>  - Merge branch 'master' into sctp-dedup
>  - Remove final declarations
>  - Move and refactor classes to reduce duplication
>  - Fix copyrignt and add sealed classes
>  - De-duplicate code in module jdk.sctp

LGTM

-------------

Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11436