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Date: Wed, 5 Mar 2014 07:01:54 +1100
Subject: Re: Functional programming
From: Chris Angelico <rosuav@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
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Xref: csiph.com comp.lang.python:67714

On Wed, Mar 5, 2014 at 6:49 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> public ConnectionPool(int maxConnections, String url) throws SQLException {
>     try {
>         super(() -> {
>             try {
>                 return DriverManager.getConnection(url);
>             } catch ( SQLException ex ) {
>                 throw new WrappedSqlException(ex);
>             }
>         }, maxConnections);
>     } catch (WrappedSqlException wse) {
>         throw wse.getSqlException();
>     }
> }
>
> ===JAVA END=============================================================
>
> ===PYTHON BEGIN=========================================================
>
> def __init__(self, max_connections, url):
>     super().__init__(lambda: DriverManager.get_connection(url), max_connections)

You're not doing the same thing, though. The Java rigmarole is to
ensure that an SQLException thrown in getConnection will propagate up,
despite (presumably) something inside the equivalent of
super().__init__ that swallows SQLExceptions. Of course it looks
tidier when you don't do the messy bit.

ChrisA