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| Re: EMF Data model and multithread application [message #424516 is a reply to message #424515] |
Tue, 28 October 2008 21:58   |
 Ed Merks
Messages: 33141
Registered: July 2009 |
Senior Member |
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Vincent,
Comments below.
Vincent L. wrote:
> Hi,
>
> Is is possible to access the EMF model from multi-thread application?
It is, and things like the transaction APIs are there to help make it safer.
>
> Is EMF is thread safe?
No more or less so than say DOM or ArrayList.
Keep in mind too that even this code for a thread safe list is not
thread safe
int index = list.indexOf(o);
list.remove(index);
Generally thread safety must be achieved at the highest levels of the
application, with things like jobs and transactions. Fine grained
thread safety is typically an illusion.
>
> Are there special methods in EMF that helps to make synchronization
> between thread or should the user manages this manually in his
> application?
Transactions and Jobs are the ways to go.
>
> Do EMF provides mutexes to lock data structures against concurrent
> access ?
No, EMF provide no locking at all, which is good because it ensures that
EMF will not cause deadlock as you try to build a higher level threading
policy around it.
>
> Thanks,
>
> Regards.
>
> Vincent
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Vincent,<br>
<br>
Comments below.<br>
<br>
<br>
Vincent L. wrote:
<blockquote cite="mid:ge819l$imt$1@build.eclipse.org" type="cite">Hi,
<br>
<br>
Is is possible to access the EMF model from multi-thread application?
<br>
</blockquote>
It is, and things like the transaction APIs are there to help make it
safer.<br>
<blockquote cite="mid:ge819l$imt$1@build.eclipse.org" type="cite"><br>
Is EMF is thread safe?
<br>
</blockquote>
No more or less so than say DOM or ArrayList.<br>
<br>
Keep in mind too that even this code for a thread safe list is not
thread safe<br>
<blockquote>int index = list.indexOf(o);<br>
list.remove(index);<br>
</blockquote>
Generally thread safety must be achieved at the highest levels of the
application, with things like jobs and transactions. Fine grained
thread safety is typically an illusion.<br>
<blockquote cite="mid:ge819l$imt$1@build.eclipse.org" type="cite"><br>
Are there special methods in EMF that helps to make synchronization
between thread or should the user manages this manually in his
application?
<br>
</blockquote>
Transactions and Jobs are the ways to go.<br>
<blockquote cite="mid:ge819l$imt$1@build.eclipse.org" type="cite"><br>
Do EMF provides mutexes to lock data structures against concurrent
access ?
<br>
</blockquote>
No, EMF provide no locking at all, which is good because it ensures
that EMF will not cause deadlock as you try to build a higher level
threading policy around it.<br>
<blockquote cite="mid:ge819l$imt$1@build.eclipse.org" type="cite"><br>
Thanks,
<br>
<br>
Regards.
<br>
<br>
Vincent
<br>
</blockquote>
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--------------000109050005030000020607--
Ed Merks
Professional Support: https://www.macromodeling.com/
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