Avoid allocations in ChannelPoolPartioning

[doom369]

Currently, ChannelPoolPartitioning does allocation for every request in uri.getBaseUrl();. The simplest possible fix is to replace uri.getBaseUrl() with uri.getHost() or maybe with the URI itself.

@hyperxpro WDYT?

[hyperxpro]

Great find.

However, using uri.getHost() will only return the hostname, not the port and schema. How about using a record class, something like this:

record PartitionKey(String scheme, String host, int port) {}

  @Override                                                                                                                                                                                                                                                                                                                                                                                                                                
  public Object getPartitionKey(Uri uri, @Nullable String virtualHost, @Nullable ProxyServer proxyServer) {
      if (proxyServer == null && virtualHost == null) {                                                                                                                                                                                                                                                                                                                                                                                    
          return new PartitionKey(uri.getScheme(), uri.getHost(), uri.getExplicitPort());
      }                                                                                                                                                                                                                                                                                                                                                                                                                                    
      // rest of the code...
  } 

This will avoid String allocation, and comparisons will be faster too.

[doom369]

@hyperxpro works for me. do you want me to send PR or you'll do it?

[hyperxpro]

Send a PR please :)