Chainvayler

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Hey guys,

Remember my PoC project *Postvayler* many years ago? It was making POJOs
persistent transparently based on @annotations and of course Prevayler.

Recently I took the idea one step forward and extended the mechanism to
also replicate POJOs among JVMs.

Here is my blog post about it:
https://medium.com/@hakan.eryargi/transparent-replication-and-persistence-for-pojo-graphs-805d9ae0f776


Here is the project *Chainvayler* itself:
https://github.com/raftAtGit/Chainvayler

Personally I find the idea really promising :)

Cheers,
Hakan (r a f t)

PS: I'm somehow got out from the email list, re-registered myself.

On Mon, Dec 2, 2013 at 12:12 AM hakan eryargi <[email protected]>
wrote:

> i'm experimenting with the idea. so far not bad. just put what I've done
> to GitHub. any suggestions, critics and contributions are welcome:)
> https://github.com/raftAtGit/Postvayler
>
> apologies for the name, it sounded like a nice word play:)
>
> to run the sample, run the Compiler class
> with raft.postvayler.samples.bank.Bank argument and then run
> raft.postvayler.samples.bank.Main
>
> how it works:
> compiler injects bytecode to root class and all @Persistent classes that
> can be accesible* from root.
>
> root class contains an injected object pool, where each @Persistent class
> is assigned a Long id and put into this object pool when created. this pool
> will be* a WeakValueMap so objects which are not attached to root will be
> garbage collected at some time.
>
> each @Persist method in a @Persistent class is instrumented like this:
> @Persist
> ReturnType doSomething(someParams) {..}
>
> doSomehing is copied to __postvayler__doSomething(..). the original doSomehing
> becomes:
>
> ReturnType doSomething(someParams) {
>     if (!there is postvayler context)
>         return __postvayler__doSomething(..);
>     if (we are in a prevayler transaction)
>         return __postvayler__doSomething(..);
>     return prevayler.execute(new MethodTransaction(..));
> }
>
> the arguments to doSomehing(..) is transformed in MethodTransaction such
> that references to @Persistent objects are replaced with Reference's,
> which will later be restored from object pool. seems as this also solves
> the Baptism problem.
>
> looks good to me for now:)
>
> cheers,
> *r a f t*
>
> * not implemented yet
>
> On Wed, Nov 27, 2013 at 11:07 AM, Naveen Chawla <[email protected]>
> wrote:
>
>> Sure, here:
>> http://docs.oracle.com/javase/tutorial/java/generics/methods.html
>>
>> As for consistency, any multi-changes explicitly synchronized over
>> prevalentObject can be auto-batched.
>>
>>
>> On 27 November 2013 00:25, Klaus Wuestefeld <[email protected]> wrote:
>>
>>> > It is ordinary generic method syntax.
>>>
>>> Could you point me to some doc on this syntax? I couldnt find it here:
>>> http://docs.oracle.com/javase/tutorial/extra/generics/methods.html
>>>
>>> > The beginning and end of a transaction would simply be any change to
>>> any
>>> > non-transient field.
>>>
>>> Suppose a transaction needs to update two fields to be correct but the
>>> system crashes after the first. Will the system not be inconsistent on
>>> recovery?
>>>
>>> Klaus
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Rapidly troubleshoot problems before they affect your business. Most IT
>>> organizations don't have a clear picture of how application performance
>>> affects their revenue. With AppDynamics, you get 100% visibility into
>>> your
>>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
>>> AppDynamics Pro!
>>>
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>>> _______________________________________________
>>> To unsubscribe go to the end of this page:
>>> http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
>>> _______________________________________________
>>> "Databases in Memoriam" -- http://www.prevayler.org
>>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Rapidly troubleshoot problems before they affect your business. Most IT
>> organizations don't have a clear picture of how application performance
>> affects their revenue. With AppDynamics, you get 100% visibility into your
>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
>> Pro!
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clktrk
>> _______________________________________________
>> To unsubscribe go to the end of this page:
>> http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
>> _______________________________________________
>> "Databases in Memoriam" -- http://www.prevayler.org
>>
>>
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hey guys,</div><div><br></div><div>R=
emember my PoC project <b>Postvayler</b> many years=C2=A0ago? It was making=
 POJOs persistent transparently based on=C2=A0@annotations and of course Pr=
evayler.</div><div><br></div><div>Recently I took the idea one step forward=
 and extended the mechanism to also replicate POJOs among JVMs.</div><div><=
br></div><div>Here is my blog post about it:</div><div><a href=3D"https://m=
edium.com/@hakan.eryargi/transparent-replication-and-persistence-for-pojo-g=
raphs-805d9ae0f776">https://medium.com/@hakan.eryargi/transparent-replicati=
on-and-persistence-for-pojo-graphs-805d9ae0f776</a>=C2=A0</div><div><br></d=
iv><div>Here is the project <b>Chainvayler</b> itself:=C2=A0<br></div><div>=
<a href=3D"https://github.com/raftAtGit/Chainvayler" target=3D"_blank">http=
s://github.com/raftAtGit/Chainvayler</a>=C2=A0</div><div><br></div><div>Per=
sonally I find the idea really promising :)</div><div><br></div><div>Cheers=
,</div><div>Hakan (r a f t)=C2=A0</div><div><br></div><div>PS: I&#39;m some=
how got out from the email list, re-registered myself.</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Dec 2, =
2013 at 12:12 AM hakan eryargi &lt;<a href=3D"mailto:[email protected]=
m">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div dir=3D"ltr">i&#39;m experimenting with the i=
dea. so far not bad. just put what I&#39;ve done to GitHub. any suggestions=
, critics and contributions are welcome:)<div><a href=3D"https://github.com=
/raftAtGit/Postvayler" target=3D"_blank">https://github.com/raftAtGit/Postv=
ayler</a></div>
<div><br></div><div>apologies for the name, it=C2=A0sounded like a nice wor=
d play:)<br></div><div><br></div><div><div>to run the sample, run the Compi=
ler class with=C2=A0raft.postvayler.samples.bank.Bank argument and then run=
 raft.postvayler.samples.bank.Main</div>
<div><br></div><div>how it works:</div><div>compiler injects bytecode to ro=
ot class and all @Persistent=C2=A0classes that can be accesible* from root.=
=C2=A0</div><div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_e=
xtra">root class contains an injected object pool, where each @Persistent c=
lass is assigned a Long id and put into this object pool when created. this=
 pool will be* a WeakValueMap so objects which are not attached to root wil=
l be garbage collected at some time.</div>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">each @Persi=
st method in a=C2=A0@Persistent class is instrumented like this:</div><div =
class=3D"gmail_extra"><font face=3D"courier new, monospace">@Persist</font>=
</div><div class=3D"gmail_extra">
<font face=3D"courier new, monospace">ReturnType doSomething(someParams) {.=
.}</font></div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_ext=
ra"><font face=3D"courier new, monospace">doSomehing </font>is copied to <f=
ont face=3D"courier new, monospace">__postvayler__doSomething(..)</font>. t=
he original <font face=3D"courier new, monospace">doSomehing </font>becomes=
:<br>
</div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra"><font=
 face=3D"courier new, monospace">ReturnType=C2=A0doSomething(someParams) {<=
/font></div><div class=3D"gmail_extra"><font face=3D"courier new, monospace=
">=C2=A0 =C2=A0 if (!there is postvayler context)=C2=A0</font></div>
<div class=3D"gmail_extra"><font face=3D"courier new, monospace">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 return __postvayler__doSomething(..);</font></div><div cl=
ass=3D"gmail_extra"><font face=3D"courier new, monospace">=C2=A0 =C2=A0 if =
(we are in a prevayler transaction)=C2=A0</font></div>
<div class=3D"gmail_extra"><font face=3D"courier new, monospace">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 return __postvayler__doSomething(..);</font></div><div cl=
ass=3D"gmail_extra"><font face=3D"courier new, monospace">=C2=A0 =C2=A0 ret=
urn prevayler.execute(new MethodTransaction(..));</font></div>
<div class=3D"gmail_extra"><font face=3D"courier new, monospace">}<br></fon=
t></div><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">the=
 arguments to doSomehing(..) is transformed in <font face=3D"courier new, m=
onospace">MethodTransaction </font>such that references to @Persistent obje=
cts are replaced with <font face=3D"courier new, monospace">Reference&#39;<=
/font><font face=3D"arial, helvetica, sans-serif">s</font>, which will late=
r be restored from object pool. seems as this also solves the Baptism probl=
em.=C2=A0</div>
<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">looks good =
to me for now:)</div><div class=3D"gmail_extra"><br></div><div class=3D"gma=
il_extra">cheers,</div><div class=3D"gmail_extra"><i>r a f t</i></div><div =
class=3D"gmail_extra">
<br></div><div class=3D"gmail_extra">* not implemented yet</div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Nov 27, 2013 at 11:=
07 AM, Naveen Chawla <span dir=3D"ltr">&lt;<a href=3D"mailto:naveen.chwl@gm=
ail.com" target=3D"_blank">[email protected]</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Sure, he=
re:=C2=A0<a href=3D"http://docs.oracle.com/javase/tutorial/java/generics/me=
thods.html" target=3D"_blank">http://docs.oracle.com/javase/tutorial/java/g=
enerics/methods.html</a><div>
<br></div><div>As for consistency, any multi-changes explicitly synchronize=
d over prevalentObject can be auto-batched.</div>
</div><div><div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quot=
e">On 27 November 2013 00:25, Klaus Wuestefeld <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>&gt;</span>=
 wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div>&gt; It is ordinary generic method syntax.<br>
<br>
</div>Could you point me to some doc on this syntax? I couldnt find it here=
:<br>
<a href=3D"http://docs.oracle.com/javase/tutorial/extra/generics/methods.ht=
ml" target=3D"_blank">http://docs.oracle.com/javase/tutorial/extra/generics=
/methods.html</a><br>
<div><br>
&gt; The beginning and end of a transaction would simply be any change to a=
ny<br>
&gt; non-transient field.<br>
<br>
</div>Suppose a transaction needs to update two fields to be correct but th=
e<br>
system crashes after the first. Will the system not be inconsistent on<br>
recovery?<br>
<div><div><br>
Klaus<br>
<br>
---------------------------------------------------------------------------=
---<br>
Rapidly troubleshoot problems before they affect your business. Most IT<br>
organizations don&#39;t have a clear picture of how application performance=
<br>
affects their revenue. With AppDynamics, you get 100% visibility into your<=
br>
Java,.NET, &amp; PHP application. Start your 15-day FREE TRIAL of AppDynami=
cs Pro!<br>
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=3D/4140/ostg.clktrk" target=3D"_blank">http://pubads.g.doubleclick.net/gam=
pad/clk?id=3D84349351&amp;iu=3D/4140/ostg.clktrk</a><br>
_______________________________________________<br>
To unsubscribe go to the end of this page: <a href=3D"http://lists.sourcefo=
rge.net/lists/listinfo/prevayler-discussion" target=3D"_blank">http://lists=
.sourceforge.net/lists/listinfo/prevayler-discussion</a><br>
_______________________________________________<br>
&quot;Databases in Memoriam&quot; -- <a href=3D"http://www.prevayler.org" t=
arget=3D"_blank">http://www.prevayler.org</a><br>
</div></div></blockquote></div><br></div>
</div></div><br>-----------------------------------------------------------=
-------------------<br>
Rapidly troubleshoot problems before they affect your business. Most IT<br>
organizations don&#39;t have a clear picture of how application performance=
<br>
affects their revenue. With AppDynamics, you get 100% visibility into your<=
br>
Java,.NET, &amp; PHP application. Start your 15-day FREE TRIAL of AppDynami=
cs Pro!<br>
<a href=3D"http://pubads.g.doubleclick.net/gampad/clk?id=3D84349351&amp;iu=
=3D/4140/ostg.clktrk" target=3D"_blank">http://pubads.g.doubleclick.net/gam=
pad/clk?id=3D84349351&amp;iu=3D/4140/ostg.clktrk</a><br>___________________=
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_______________________________________________<br>
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arget=3D"_blank">http://www.prevayler.org</a><br>
<br></blockquote></div><br></div></div></div></div>
</blockquote></div></div>

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To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion
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