syncronise all and any code that accesses the array, and make sure that your
blocks are "wide" enough.
E.G. this WON'T work because the "syncronized" bock should be out-side of
the loop.
public void populateBigArray ( long[] bigArray )
{
for (i = 0 ; i< VERY_BIG_NUMBER ; i++)
{
syncronized (bigArray)
{
bigArray[i] = i;
}
}
}
> -----Original Message-----
> From: Ionel Condor [SMTP:[EMAIL PROTECTED]]
> Sent: 07 November 2002 03:16
> To: [EMAIL PROTECTED]
> Subject: Re: how to lock the access to an array till a method is
> finished ...
>
> I have already do this but does not help.
> The synch in this case does not help, as it LOCKS the object that calls
> the
> method and NOT THE the array that is used by the method and also by the
> jsp
> page.
> (my use of 'volatile' also does not help).
>
> Ionel.
>
> > Syncronize the code/method that populates the array as well as the
> > code/methods that access it. This can either be done using the
> syncronise
> > method modifier, or using syncronised blocks, which is better.
> >
> > This is however more of an elementary Java issue though, search the web
> for
> > the PDF version of Bruce Eckel's book: "Thinking in Java" and read
> chapter
> > 14.
> >
> >
> >
> > > -----Original Message-----
> > > From: Ionel Condor [SMTP:[EMAIL PROTECTED]]
> > > Sent: 07 November 2002 02:43
> > > To: [EMAIL PROTECTED]
> > > Subject: how to lock the access to an array till a method is
> > > finished...
> > >
> > > Hi,
> > > I have the following situation:
> > > In a bean, I have a method that populates an array with a large, very
> > > large
> > > amount of data (required for some operations).
> > > From my jsp page I do not want to allow any web clients to see the
> length
> > > of
> > > this array, till the process of population is finished....I mean that
> > > otherwise one can see intermediary results and I want to avoid this.
> > >
> > > (I have tried to mark volatile the array but this helps me only to
> keep
> > > the
> > > correct value in all the threads, does not lock me also the object).
> > >
> > > Do I have to use a complicated wait/notify mechanism to achive this or
> how
> > > can I do ?
> > >
> > > Many thanks,
> > > Ionel C.
> > >
> > >
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It is the strict policy of Truworths that its e-mail facility and all
e-mail communications emanating therefrom, should be utilised for
business purposes only and should conform to high professional and
business standards. Truworths has stipulated certain regulations in
terms whereof strict guidelines relating to the use and content of
e-mail communications are laid down. The use of the Truworths e-mail
facility is not permitted for the distribution of chain letters or
offensive mail of any nature whatsoever. Truworths hereby distances
itself from and accepts no liability in respect of the unauthorised
use of its e-mail facility or the sending of e-mail communications
for other than strictly business purposes. Truworths furthermore
disclaims liability for any unauthorised instruction for which
permission was not granted. Truworths Limited accepts no liability
for any consequences arising from or as a result of reliance on this
message unless it is in respect of bona fide Truworths business for
which proper authorisation has been granted.
Any recipient of an unacceptable communication, a chain letter or
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appropriate action can be taken against the individual concerned.
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For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
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http://www.esperanto.org.nz/jsp/jspfaq.jsp
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