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Date: Fri, 27 May 2016 18:38:40 +0300
Message-ID: <CAMegbcLR_UwvhoQ4pvBiEvHnRZm6hGnvbomnD9eL3CkzhsZtmg@mail.gmail.com>
Subject: Re: Simulating Graph Dependencies With Ignite
From: Alexei Scherbakov <alexey.scherbakoff@gmail.com>
To: user@ignite.apache.org
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archived-at: Fri, 27 May 2016 15:38:53 -0000

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Of course you can store result of recalculation in the temp variable if
it's needed for next recalculation.


2016-05-27 18:34 GMT+03:00 Alexei Scherbakov <alexey.scherbakoff@gmail.com>:

> Hi,
>
> You can store cell dependencies as Ignite's data grid of
>
> IgniteCache<Cell, Cell> cells = ...
>
> where relation between key and value is interpreted like: value depends on
> key.
>
> When the cell is updated you do the following:
>
> Cell cell = updated;
> do {
>      recalculate(cell);
> } while( (cell = cells.get(cell)) != null);
>
> Did it help ?
>
>
>
>
>
> 2016-05-27 16:49 GMT+03:00 pragmaticbigdata <amits.84@gmail.com>:
>
>> Hello,
>>
>> I have started exploring apache ignite by following the introductory
>> videos.
>> It looks quite promising and I wanted to understand if it will be well
>> suited for the use case I brief out below. If so, I would be glad to hear
>> out on how could I approach it
>>
>> The use case is
>>
>> We are trying to implement cell level dependencies within multiple tables.
>> It's similar to the functionality excel offers just that in our case it
>> could span across multiple tables. Imagine multiple cells in an excel
>> worksheet having interdependent formula's where updating a value in one
>> cell
>> causes another cell value to change and that cell update causes another
>> cell
>> value to update and so on and so forth. It is kind of graph of
>> dependencies
>> that determines what is the next row cell that needs to be updated.
>>
>> With apache ignite, what api's and data structures could I use to
>> maintain a
>> graph of inter-dependencies between multiple tables? Note that these would
>> be metadata dependencies and not data.
>>
>> I would appreciate to get inputs on this.
>>
>> Thanks,
>> Amit
>>
>>
>>
>> --
>> View this message in context:
>> http://apache-ignite-users.70518.x6.nabble.com/Simulating-Graph-Dependencies-With-Ignite-tp5282.html
>> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>>
>
>
>
> --
>
> Best regards,
> Alexei Scherbakov
>


-- 

Best regards,
Alexei Scherbakov

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<div dir=3D"ltr">Of course you can store result of recalculation in the tem=
p variable if it&#39;s needed for next recalculation.<div><br></div></div><=
div class=3D"gmail_extra"><br><div class=3D"gmail_quote">2016-05-27 18:34 G=
MT+03:00 Alexei Scherbakov <span dir=3D"ltr">&lt;<a href=3D"mailto:alexey.s=
cherbakoff@gmail.com" target=3D"_blank">alexey.scherbakoff@gmail.com</a>&gt=
;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi,<div><br></=
div><div>You can store cell dependencies as Ignite&#39;s data grid of</div>=
<div><br></div><div>IgniteCache&lt;Cell, Cell&gt; cells =3D ...</div><div><=
br></div><div>where relation between key and value is interpreted like: val=
ue depends on key.</div><div><br></div><div>When the cell is updated you do=
 the following:</div><div><br></div><div>Cell cell =3D updated;</div><div>d=
o {</div><div>=C2=A0 =C2=A0 =C2=A0recalculate(cell);</div><div>} while( (ce=
ll =3D cells.get(cell)) !=3D null);</div><div><br></div><div>Did it help ?<=
/div><div><br></div><div><br></div><div><br></div><div><br></div></div><div=
 class=3D"gmail_extra"><div><div class=3D"h5"><br><div class=3D"gmail_quote=
">2016-05-27 16:49 GMT+03:00 pragmaticbigdata <span dir=3D"ltr">&lt;<a href=
=3D"mailto:amits.84@gmail.com" target=3D"_blank">amits.84@gmail.com</a>&gt;=
</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
I have started exploring apache ignite by following the introductory videos=
.<br>
It looks quite promising and I wanted to understand if it will be well<br>
suited for the use case I brief out below. If so, I would be glad to hear<b=
r>
out on how could I approach it<br>
<br>
The use case is<br>
<br>
We are trying to implement cell level dependencies within multiple tables.<=
br>
It&#39;s similar to the functionality excel offers just that in our case it=
<br>
could span across multiple tables. Imagine multiple cells in an excel<br>
worksheet having interdependent formula&#39;s where updating a value in one=
 cell<br>
causes another cell value to change and that cell update causes another cel=
l<br>
value to update and so on and so forth. It is kind of graph of dependencies=
<br>
that determines what is the next row cell that needs to be updated.<br>
<br>
With apache ignite, what api&#39;s and data structures could I use to maint=
ain a<br>
graph of inter-dependencies between multiple tables? Note that these would<=
br>
be metadata dependencies and not data.<br>
<br>
I would appreciate to get inputs on this.<br>
<br>
Thanks,<br>
Amit<br>
<br>
<br>
<br>
--<br>
View this message in context: <a href=3D"http://apache-ignite-users.70518.x=
6.nabble.com/Simulating-Graph-Dependencies-With-Ignite-tp5282.html" rel=3D"=
noreferrer" target=3D"_blank">http://apache-ignite-users.70518.x6.nabble.co=
m/Simulating-Graph-Dependencies-With-Ignite-tp5282.html</a><br>
Sent from the Apache Ignite Users mailing list archive at Nabble.com.<br>
</blockquote></div><br><br clear=3D"all"><div><br></div></div></div><span c=
lass=3D"HOEnZb"><font color=3D"#888888">-- <br><div data-smartmail=3D"gmail=
_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"></div><=
div><div dir=3D"ltr"><br>Best regards,<br></div><div>Alexei Scherbakov<br><=
/div></div></div></div></div></div>
</font></span></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><d=
iv><div dir=3D"ltr"><div dir=3D"ltr"></div><div><div dir=3D"ltr"><br>Best r=
egards,<br></div><div>Alexei Scherbakov<br></div></div></div></div></div></=
div>
</div>

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