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List:       jakarta-commons-dev
Subject:    Re: [DBCP]
From:       Matt Sicker <boards () gmail ! com>
Date:       2017-03-29 18:34:01
Message-ID: CACmp6kqWH3m5YBFp0c90A86MZ8xy+4SKe0Xcg2cS9r=7uM6AGw () mail ! gmail ! com
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MethodHandles.Lookup lookup = MethodHandles.lookup();
MethodType mt = MethodType.methodType(boolean.class, int.class);
MethodHandle handle = lookup.findVirtual(Connection.class, "isValid", mt);

// ...

boolean isValid = (boolean) handle.invokeExact(connection, timeout);

The findVirtual() call above will throw NoSuchMethodException if it doesn't
exist. This is basically the same thing as traditional reflection, but more
direct.

On 29 March 2017 at 13:09, Gary Gregory <garydgregory@gmail.com> wrote:

> On Wed, Mar 29, 2017 at 8:28 AM, Matt Sicker <boards@gmail.com> wrote:
>
> > Using a MethodHandle lookup ahead of time to create a fast invocation
> proxy
> > and using that where available would make sense. I don't like the idea of
> > catching errors like that.
> >
>
> Hi Matt,
>
> Thank you for the tip. Do you have an example handy? (short on time today,
> scrambling like a madman, otherwise I'd hack around)
>
> Gary
>
>
> >
> > On 29 March 2017 at 01:53, Gary Gregory <garydgregory@gmail.com> wrote:
> >
> > > Hi All:
> > >
> > > The method:
> > >
> > > org.apache.commons.dbcp2.DelegatingConnection.isValid(int)
> > >
> > > delegates to a JDBC method that is marked "@since 1.6" in the JDBC
> > Javadoc.
> > >
> > > I am dealing with an old JDBC driver that throws an AbstractMethodError
> > > when this method is called.
> > >
> > > How can I workaround this? Should we add some mode to DBCP2 to deal
> with
> > > pre-1.6 JDBC drivers? If so how? Catch the AME specifically and
> return...
> > > what?
> > >
> > > Gary
> > >
> > > --
> > > E-Mail: garydgregory@gmail.com | ggregory@apache.org
> > > Java Persistence with Hibernate, Second Edition
> > > <https://www.amazon.com/gp/product/1617290459/ref=as_li_
> > > tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&
> > > linkCode=as2&tag=garygregory-20&linkId=cadb800f39946ec62ea2b1af9fe6a2
> b8>
> > >
> > > <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> > > 1617290459>
> > > JUnit in Action, Second Edition
> > > <https://www.amazon.com/gp/product/1935182021/ref=as_li_
> > > tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182021&
> > > linkCode=as2&tag=garygregory-20&linkId=31ecd1f6b6d1eaf8886ac902a24de4
> > 18%22
> > > >
> > >
> > > <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> > > 1935182021>
> > > Spring Batch in Action
> > > <https://www.amazon.com/gp/product/1935182951/ref=as_li_
> > > tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182951&
> > > linkCode=%7B%7BlinkCode%7D%7D&tag=garygregory-20&linkId=%7B%
> > > 7Blink_id%7D%7D%22%3ESpring+Batch+in+Action>
> > > <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> > > 1935182951>
> > > Blog: http://garygregory.wordpress.com
> > > Home: http://garygregory.com/
> > > Tweet! http://twitter.com/GaryGregory
> > >
> >
> >
> >
> > --
> > Matt Sicker <boards@gmail.com>
> >
>
>
>
> --
> E-Mail: garydgregory@gmail.com | ggregory@apache.org
> Java Persistence with Hibernate, Second Edition
> <https://www.amazon.com/gp/product/1617290459/ref=as_li_
> tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&
> linkCode=as2&tag=garygregory-20&linkId=cadb800f39946ec62ea2b1af9fe6a2b8>
>
> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> 1617290459>
> JUnit in Action, Second Edition
> <https://www.amazon.com/gp/product/1935182021/ref=as_li_
> tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182021&
> linkCode=as2&tag=garygregory-20&linkId=31ecd1f6b6d1eaf8886ac902a24de418%22
> >
>
> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> 1935182021>
> Spring Batch in Action
> <https://www.amazon.com/gp/product/1935182951/ref=as_li_
> tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182951&
> linkCode=%7B%7BlinkCode%7D%7D&tag=garygregory-20&linkId=%7B%
> 7Blink_id%7D%7D%22%3ESpring+Batch+in+Action>
> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=
> 1935182951>
> Blog: http://garygregory.wordpress.com
> Home: http://garygregory.com/
> Tweet! http://twitter.com/GaryGregory
>



-- 
Matt Sicker <boards@gmail.com>


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