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From Matt Sicker <boa...@gmail.com>
Subject Re: [lang] Thread safety annotations
Date Wed, 30 Nov 2016 04:11:47 GMT
Oh that's a pretty decent advantage there actually.

On 29 November 2016 at 22:07, Gary Gregory <garydgregory@gmail.com> wrote:

> On Tue, Nov 29, 2016 at 8:04 PM, Matt Sicker <boards@gmail.com> wrote:
>
> > That's pretty neat. So it looks like two competing styles of annotations
> > here would be separate annotations for each concern, a single annotation
> > with an enum, or even separate annotations with boolean values or enums
> > (though that gets a little more complex come to think of it).
> >
>
> The problem with solo annotations is that you can say nonsensical things
> like:
>
> @ThreadSafe
> @NotThreadSafe
> public class Foo {
> ...
> }
>
> You can't do that with:
>
> @Contract(threading = ThreadingBehavior.IMMUTABLE)
>
> Gary
>
>
> >
> > If only the JDK had an annotation for this.
> >
> > On 29 November 2016 at 20:41, Gary Gregory <garydgregory@gmail.com>
> wrote:
> >
> > > And an example:
> > >
> > > /**
> > >  * HTTP/2 compatible extension of {@link RequestConnControl}.
> > >  *
> > >  * @since 5.0
> > >  */
> > > @Contract(threading = ThreadingBehavior.IMMUTABLE)
> > > public class H2RequestConnControl extends RequestConnControl {
> > > ...
> > >
> > > Gary
> > >
> > > On Tue, Nov 29, 2016 at 6:40 PM, Gary Gregory <garydgregory@gmail.com>
> > > wrote:
> > >
> > > > FYI, this is how we're going to do it in HttpComponents 5:
> > > > https://svn.apache.org/repos/asf/httpcomponents/
> > > > httpcore/trunk/httpcore5/src/main/java/org/apache/hc/core5/
> > > > annotation/ThreadingBehavior.java
> > > >
> > > > Gary
> > > >
> > > > On Tue, Nov 29, 2016 at 2:20 PM, Gary Gregory <
> garydgregory@gmail.com>
> > > > wrote:
> > > >
> > > >> On Tue, Nov 29, 2016 at 1:59 PM, Benedikt Ritter <
> britter@apache.org>
> > > >> wrote:
> > > >>
> > > >>> I agree with Oliver. I don't think we have consensus about if
and
> how
> > > we
> > > >>> want to implement this. Does it even make sense to try to document
> > > this?
> > > >>> What value does such a documentation have, when it is wrong 50%
of
> > the
> > > >>> time? I just sumed up the feedback I got from one (!) user at
the
> > > >>> conference. I think this needs more thought. This is why I
> suggested
> > to
> > > >>> create a PR instead of committing this directly to master.
> > > >>>
> > > >>
> > > >> This is a good discussion. Let's keep in mind the audience for these
> > new
> > > >> annotations:
> > > >>
> > > >> - Commons Lang
> > > >> - All of Commons
> > > >> - Any Java code.
> > > >>
> > > >> Just because we may not get to document thread safety properly in
> > > Commons
> > > >> Lang does not mean that any other developers will fail similarly.
> > > >>
> > > >> My goal is not to decorate all of Commons Lang with these new
> > > annotations
> > > >> and certainly not to take on the task of documenting all of Commons
> > ;-)
> > > >>
> > > >> I look at these annotations as a tool, a Commons way of using
> > > annotations
> > > >> where some folks best see fit.
> > > >>
> > > >> Providing these annotations is one thing, using them another ;-)
> > > >>
> > > >> Gary
> > > >>
> > > >>
> > > >>>
> > > >>> Regards.
> > > >>> Benedikt
> > > >>>
> > > >>> Gary Gregory <garydgregory@gmail.com> schrieb am Di. 29.
Nov. 2016
> > um
> > > >>> 22:33:
> > > >>>
> > > >>> > On Tue, Nov 29, 2016 at 1:12 PM, Oliver Heger <
> > > >>> > oliver.heger@oliver-heger.de>
> > > >>> > wrote:
> > > >>> >
> > > >>> > >
> > > >>> > >
> > > >>> > > Am 28.11.2016 um 22:28 schrieb Gary Gregory:
> > > >>> > > > WRT licensing, I re-implemented the annotations
in git
> master.
> > > >>> Notice
> > > >>> > > that
> > > >>> > > > all Javadocs are different and much simpler for
now. Feel
> free
> > to
> > > >>> write
> > > >>> > > > more.
> > > >>> > >
> > > >>> > > As the length of this thread shows, using annotations
for the
> > > >>> purpose of
> > > >>> > > documenting thread-safety can be a controversial topic.
> > > >>> > >
> > > >>> >
> > > >>> > How is the length of a thread a reflection of its controversy?
> > > >>> >
> > > >>> >
> > > >>> > > I do not see the advantage over a plain text documentation
in
> > > >>> Javadoc.
> > > >>> > > Written text can even be more comprehensive.
> > > >>> > >
> > > >>> >
> > > >>> > One does not exclude the other. Annotations are easy to search.
> > Text
> > > in
> > > >>> > Javadoc is subject to typos and formatting oddities that
makes it
> > > much
> > > >>> > harder to search.
> > > >>> >
> > > >>> > Tools can work with annotations.
> > > >>> >
> > > >>> >
> > > >>> > >
> > > >>> > > The risk that the documentation goes out of sync with
the
> > > >>> implementation
> > > >>> > > is given in both scenarios. But if a class announced
as
> > thread-safe
> > > >>> is
> > > >>> > > manipulated in a way that it is no longer thread-safe,
I would
> > > >>> consider
> > > >>> > > this as a bug. This is also a kind of backwards-incompatible
> > > change.
> > > >>> > >
> > > >>> >
> > > >>> > That has nothing to do with annotations. If we change behavior
in
> > > some
> > > >>> > incompatible way, that's the bug.
> > > >>> >
> > > >>> > I can interpret what you wrote as: If I remove an @Override
> > > annotation,
> > > >>> > then that is backwards-incompatible change. That sounds extreme.
> > > >>> >
> > > >>> > I do not think we have talked about annotations in the context
of
> > > >>> backwards
> > > >>> > compatibility. Does this deserve a separate discussion?
> > > >>> >
> > > >>> > a third penny,
> > > >>> > Gary
> > > >>> >
> > > >>> >
> > > >>> > >
> > > >>> > > My 2 cents
> > > >>> > > Oliver
> > > >>> > >
> > > >>> > > >
> > > >>> > > > Gary
> > > >>> > > >
> > > >>> > > > On Mon, Nov 28, 2016 at 12:55 PM, Gary Gregory
<
> > > >>> garydgregory@gmail.com
> > > >>> > >
> > > >>> > > > wrote:
> > > >>> > > >
> > > >>> > > >> On Mon, Nov 28, 2016 at 12:18 PM, Matt Benson
<
> > > >>> gudnabrsam@gmail.com>
> > > >>> > > >> wrote:
> > > >>> > > >>
> > > >>> > > >>> I hoped to stay out of this. :) Points:
> > > >>> > > >>>
> > > >>> > > >>> * "provided" scope is another Maven mechanism
that compiles
> > > >>> against a
> > > >>> > > >>> given dependency but does not pull the
dependency in as a
> > > runtime
> > > >>> > > >>> dependency. I personally prefer it to marking
a dependency
> > > >>> optional.
> > > >>> > > >>> * For annotations with only classfile retention,
a future
> > > package
> > > >>> > > >>> rename e.g. lang4 would not require a consumer
to upgrade
> > just
> > > >>> for
> > > >>> > the
> > > >>> > > >>> renamed annotation, though nothing would
stop them from
> doing
> > > >>> so. A
> > > >>> > > >>> given project could depend on either or
both of lang3 and
> > lang4
> > > >>> in
> > > >>> > any
> > > >>> > > >>> combination of compile-only or runtime-inclusive
scope with
> > no
> > > >>> > > >>> problems.
> > > >>> > > >>> * A standalone annotations component might
be interesting,
> > but
> > > >>> I'm
> > > >>> > not
> > > >>> > > >>> sure if the proposed annotations constitute
a critical mass
> > > >>> adequate
> > > >>> > > >>> to justify it.
> > > >>> > > >>>
> > > >>> > > >>
> > > >>> > > >> I would have a hard time justifying a
> > commons-lang3-annotations
> > > >>> module
> > > >>> > > >> with only these 4 annotations.
> > > >>> > > >>
> > > >>> > > >> I could see having a Commons Annotations component
though
> > which
> > > >>> for
> > > >>> > good
> > > >>> > > >> or bad would hold all annotations one could
imagine having
> the
> > > >>> Commons
> > > >>> > > >> world. Hm... it smells a bit though...
> > > >>> > > >>
> > > >>> > > >> Gary
> > > >>> > > >>
> > > >>> > > >>
> > > >>> > > >>>
> > > >>> > > >>> Matt
> > > >>> > > >>>
> > > >>> > > >>> On Mon, Nov 28, 2016 at 1:21 PM, Pascal
Schumacher
> > > >>> > > >>> <pascalschumacher@gmx.net> wrote:
> > > >>> > > >>>> Groovy had to change the license of
its documentation from
> > > CC-A
> > > >>> 3.0
> > > >>> > to
> > > >>> > > >>> the
> > > >>> > > >>>> Apache License during incubation:
> > > >>> > > >>>>
> > > >>> > > >>>> https://issues.apache.org/jira/browse/LEGAL-167
> > > >>> > > >>>> http://markmail.org/message/2e7tehlwtpx625q4
> > > >>> > > >>>> https://issues.apache.org/jira/browse/GROOVY-7470
> > > >>> > > >>>>
> > > >>> > > >>>> So I guess Commons is probably not
allowed to use these
> > files.
> > > >>> > > >>>>
> > > >>> > > >>>>
> > > >>> > > >>>> Am 28.11.2016 um 18:58 schrieb Gary
Gregory:
> > > >>> > > >>>>>
> > > >>> > > >>>>> On Mon, Nov 28, 2016 at 7:15 AM,
Jochen Wiedmann
> > > >>> > > >>>>> <jochen.wiedmann@gmail.com>
> > > >>> > > >>>>> wrote:
> > > >>> > > >>>>>
> > > >>> > > >>>>>> On Mon, Nov 28, 2016 at 4:06
PM, sebb <sebbaz@gmail.com
> >
> > > >>> wrote:
> > > >>> > > >>>>>>
> > > >>> > > >>>>>>> The code would not run
without the JCIP jar.
> > > >>> > > >>>>>>
> > > >>> > > >>>>>> Are there licensing issues
regarding that jar?
> > > >>> > > >>>>>>
> > > >>> > > >>>>> Hm, according to https://www.apache.org/legal/
> > resolved.html,
> > > >>> the
> > > >>> > > >>> license
> > > >>> > > >>>>> "Creative Commons Attribution (CC-A)
2.5" is discussed in
> > the
> > > >>> > section
> > > >>> > > >>> "HOW
> > > >>> > > >>>>> SHOULD "WEAK COPYLEFT" LICENSES
BE HANDLED?"
> > > >>> > > >>>>>
> > > >>> > > >>>>> It looks like we might have an
issue but this is not
> clear
> > to
> > > >>> me as
> > > >>> > > >>> IANAL.
> > > >>> > > >>>>> I you look at the license summary
> > > >>> > > >>>>> https://creativecommons.org/licenses/by/2.5/
it sure
> seems
> > > >>> OK, but
> > > >>> > > our
> > > >>> > > >>>>> resolved.html has this license
on a list of licenses to
> > watch
> > > >>> out
> > > >>> > > for.
> > > >>> > > >>>>>
> > > >>> > > >>>>> So to be on the safe side, how
do we best re-implement
> > these?
> > > >>> The
> > > >>> > > >>>>> annotation names we can keep as
is but I would imagine
> that
> > > >>> we'd
> > > >>> > want
> > > >>> > > >>> to
> > > >>> > > >>>>> re-write the Javadoc from scratch.
> > > >>> > > >>>>>
> > > >>> > > >>>>> Thoughts?
> > > >>> > > >>>>>
> > > >>> > > >>>>> Gary
> > > >>> > > >>>>>
> > > >>> > > >>>>>
> > > >>> > > >>>>>> Jochen
> > > >>> > > >>>>>>
> > > >>> > > >>>>>>
> > > >>> > > >>>>>> --
> > > >>> > > >>>>>> The next time you hear: "Don't
reinvent the wheel!"
> > > >>> > > >>>>>>
> > > >>> > > >>>>>> http://www.keystonedevelopment.co.uk/wp-
> > > content/uploads/2014
> > > >>> /10/
> > > >>> > > >>>>>> evolution-of-the-wheel-300x85.jpg
> > > >>> > > >>>>>>
> > > >>> > > >>>>>> ------------------------------
> > > ------------------------------
> > > >>> > > ---------
> > > >>> > > >>>>>> To unsubscribe, e-mail: dev-unsubscribe@commons.
> > apache.org
> > > >>> > > >>>>>> For additional commands, e-mail:
> > > dev-help@commons.apache.org
> > > >>> > > >>>>>>
> > > >>> > > >>>>>>
> > > >>> > > >>>>>
> > > >>> > > >>>>
> > > >>> > > >>>>
> > > >>> > > >>>>
> > > >>> > ------------------------------------------------------------
> > > ---------
> > > >>> > > >>>> To unsubscribe, e-mail: dev-unsubscribe@commons.
> apache.org
> > > >>> > > >>>> For additional commands, e-mail:
> > dev-help@commons.apache.org
> > > >>> > > >>>>
> > > >>> > > >>>
> > > >>> > > >>> ------------------------------
> ------------------------------
> > > >>> ---------
> > > >>> > > >>> To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> > > >>> > > >>> For additional commands, e-mail:
> dev-help@commons.apache.org
> > > >>> > > >>>
> > > >>> > > >>>
> > > >>> > > >>
> > > >>> > > >>
> > > >>> > > >> --
> > > >>> > > >> 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=cadb800f39946ec62ea2b
> > > >>> 1af9fe6a2b8>
> > > >>> > > >>
> > > >>> > > >> <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=31ecd1f6b6d1eaf8886ac
> > > >>> 902a24de418%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
> > > >>> > > >>
> > > >>> > > >
> > > >>> > > >
> > > >>> > > >
> > > >>> > >
> > > >>> > > ------------------------------------------------------------
> > > >>> ---------
> > > >>> > > To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> > > >>> > > For additional commands, e-mail: dev-help@commons.apache.org
> > > >>> > >
> > > >>> > >
> > > >>> >
> > > >>> >
> > > >>> > --
> > > >>> > 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&linkCo
> > > >>> de=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&linkCo
> > > >>> de=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&linkCo
> > > >>> de=%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
> > > >>> >
> > > >>>
> > > >>
> > > >>
> > > >>
> > > >> --
> > > >> 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
> > > >>
> > > >
> > > >
> > > >
> > > > --
> > > > 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
> > > >
> > >
> > >
> > >
> > > --
> > > 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
> > >
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-- 
Matt Sicker <boards@gmail.com>

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