Hi
There is nothing which stops this solution working over multiple JVMs.
You can either use an RMI logging thread, or multiple log files and consolidate
outside the VM, or a queue in the underlying database, which can be accessed
from multiple VMs.
Also refer to the discussion on singletons over multiple VMs earlier in this
mailing list archives.
Joel Crisp, Senior Java Architect, SUN PS Java Center (UK)
Chris Raber wrote:
>
> Joel,
>
> Your solution only works in a single JVM architecture. What if you have your
> components spread over many JVM's?
>
> You need a singleton logging service in this context.
>
> -Chris.
>
> > -----Original Message-----
> > From: Joel Crisp [SMTP:[EMAIL PROTECTED]]
> > Sent: Tuesday, November 23, 1999 9:24 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Java implementation Query:Urgent
> >
> > Hi
> >
> > Both of these solutions are BAD !
> >
> > You should implement a queue which can take multiple threads writing log
> > objects
> > to the queue. You can do this without synchronization using the atomic
> > features
> > of the java language calculations and volatile variables. Then use one
> > thread
> > to pull the log objects of the queue and write them to the file.
> >
> > Locking on a shared object will bottleneck your performance, and JNI is
> > discouraged
> > in EJBs.
> >
> > Joel Crisp, Senior Java Architect, SUN PS Java Center (UK)
> >
> > Srinivasan VS wrote:
> > >
> > > Hi
> > >
> > > If multiple applications are writing on to the same file, you might need
> > to
> > > implement the writing using JNI (C does provided for opening a file in
> > > mutually exclusive mode). I dont
> > > think Java allows opening a file in mutually exclusive mode.
> > >
> > > If multiple threads of the same application are writing to the same
> > file,
> > > you might consider getting locks on a shared object.
> > >
> > > Hope this helps
> > > srini
> > > ----- Original Message -----
> > > From: Sanjay Nambiar <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Saturday, November 20, 1999 4:52 AM
> > > Subject: Java implementation Query:Urgent
> > >
> > > > Hi All,
> > > > Sorry to post this mail on this mailing list.But if some one could
> > provide
> > > a
> > > > solution.....
> > > > We have "probably" a preliminary query.
> > > > In our application we would like to write to one log file by multiple
> > > > processes.The problem we are facing is as follows:
> > > > We have to implement one log class which would be static and a method
> > of
> > > > that class would be called by the respective
> > > > applications.
> > > >
> > > > During writing to the file, the messages are being Garbled as shown
> > below.
> > > > Error Num Insert query is as follows:"....."
> > > > Where the string "Error Num" actually is a complete string "Error
> > Number
> > > is
> > > > :100 ISAM Query" .
> > > >
> > > > This is because multiple applications are trying to write to the file
> > at
> > > the
> > > > same time.
> > > > We have implemented RandomAccessFile.Method is
> > > RandomAccessFile.WriteBytes()
> > > > We request for a solution in terms of brief pointers or a detailed
> > > solution.
> > > >
> > > > Regards,
> > > > SANJAY Nambiar
> > > >
> > > >
> > >
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> > > >
> > > >
> > >
> > >
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