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Top Forums Shell Programming and Scripting How to update the contents in a file conditionally? Post 86366 by Neo on Thursday 13th of October 2005 12:47:48 PM
Old 10-13-2005
There are many ways to do this.

One way to do it is to write a temporary file in a directory each time a login fails. For example, your directory might look like:

india.pid1
us.pid2
uk.pid3

As you can see you can append the process id to the origins to avoid filename collisions.

Then, in a cron job, you can read the file names and add them up for each origin. Then, read the flat file where the previous values are stored into a array and add the new and old values, and write the new file.

Make sure to clean up the directory of temporary files.

You can also do this without an intermediate temporary file used as an IPC, in a single process, but if you have multiple login failures at one time, you will have have to implement file locking, which might be slower and more complex than a simple IPC like a temporary file.

There are myriad ways to do this. I suggest you use an intermediate approach like I suggested to avoid problems if you get multiple login failures in bursts - having said that, you did not describe the software architecture where the actually login failure flag (detection) occurs.
 

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Session::Store::Oracle(3)				User Contributed Perl Documentation				 Session::Store::Oracle(3)

NAME
Apache::Session::Store::Oracle - Store persistent data in a Oracle database SYNOPSIS
use Apache::Session::Store::Oracle; my $store = new Apache::Session::Store::Oracle; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::Oracle fulfills the storage interface of Apache::Session. Session data is stored in a Oracle database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions': id varchar2(32) # or however long your session IDs are. a_session long To create this schema, you can execute this command using the sqlplus program: CREATE TABLE sessions ( id varchar2(32) not null primary key, a_session long ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are DataSource, UserName, and Password. Example: tie %hash, 'Apache::Session::Oracle', $id, { DataSource => 'dbi:Oracle:database', UserName => 'database_user', Password => 'K00l' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::Oracle', $id, { Handle => $dbh }; The last option is LongReadLen, which specifies the maximum size of the session object. If not supplied, the default maximum size is 8 KB. AUTHOR
This modules was written by Jeffrey William Baker <jwbaker@acm.org> A fix for the commit policy was contributed by Michael Schout <mschout@gkg.net> SEE ALSO
Apache::Session, Apache::Session::Store::DBI perl v5.12.1 2007-09-28 Session::Store::Oracle(3)
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