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Re: InstantDB: Synchronized Servlets


Okay -- I guess my question is devolving down to
whether the servlet engine is using multiple
JVM's.  I'm not using Enhydra -- I'm writing
servlets to run at an ISP (mycgiserver.com) which
is running jserv under apache.  But I believe
there is only one JVM.   I can check on that.

Thanks for the help.

Steve

----- Original Message -----
From: "Thom Nelson" <thom@lutris.com>
To: <instantDB@enhydra.org>
Sent: Wednesday, March 21, 2001 11:43 AM
Subject: Re: InstantDB: Synchronized Servlets


| The only time you'd want to use the RmiJdbc
driver is when accessing the
| same InstantDB database using two or more Java
Virtual Machine
| processes.  You should have no problem accessing
the same database from
| within the same JVM.  If you're running two
servlets in one instance of
| Enhydra, for example, you won't run into any
issues using the same
| InstantDB database.
|
| Thom
|
| Steve Carton wrote:
| >
| > Thom,
| >
| > I guess I'm a little surprised by that.  I
would
| > have thought if I created a synchronized,
static
| > method encapsulating my IDB action, since
statics
| > are shared by all servlet instances, it would
| > prevent a collision.
| >
| > Steve
| > ----- Original Message -----
| > From: "Thom Nelson" <thom@lutris.com>
| > To: <instantDB@enhydra.org>
| > Sent: Tuesday, March 20, 2001 5:34 PM
| > Subject: Re: InstantDB: Synchronized Servlets
| >
| > | Hi Steve,
| > |
| > | This will not work, because you will still
have
| > different instances of
| > | instantdb running against the same database
| > files.  This will inevitably
| > | result in corrupted data, since much of
| > instantdb's state is cached in
| > | memory.  This isn't a threading issue;
instantdb
| > works fine with
| > | multiple threads, just not multiple VMs.
| > |
| > | Thom
| > |
| > | Steve Carton wrote:
| > | >
| > | > I'm wondering if I can achieve the same
effect
| > as the RmiJdbc server from a
| > | > servlet if I encapsulate the JDBC code in
| > synchronized methods?
| > | >
| > | > Anyone try that?
| > | >
| > | > Steve Carton
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