RFR: 8274308: Improve efficiency for HandshakeContext initialization. [v2]

[Xue-Lei Andrew Fan]

On Sat, 6 Nov 2021 08:54:33 GMT, Daniel Jeliński <duke at openjdk.java.net> wrote:

> Can we extend the public API of `SSLContext` with methods for managing `activeProtocols`, `activeCipherSuites` and possibly `algorithmConstraints`? Without this API change we would need to check every time if the active protocols, ciphers and constraints match the cached ones.
> 

Yes, it is one direction that we could consider to have more configuration in SSLContext, rather than configure individually in each socket.  I think it may improve the performance a lot.

> Also, looking at the flame graphs provided, it appears that about 50% of the handshake time is spent in `SSLAlgorithmDecomposer#decompose`; given that there are only 3 instances of that class (and could be further reduced to 2), would it make sense to optimize the method by caching the results of algorithm decomposition?

If it is true, I think should optimize the decompose method, may be not limited to caching.

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PR: https://git.openjdk.java.net/jdk/pull/5793