Have you looked at using the fn:trace() or xdmp:trace() functions and filtering
the log on the event name?
If you called fn:trace() like this:
fn:trace( "This is my application's message", "MyApplication")
It writes an entry to ErrorLog.txt that looks like this;
2010-03-10 08:26:49.605 Info: [Event:id=MyApplication] This is my
application's message
It's then easy to read the ErrorLog.txt and return the lines with your
particular event name ("id=...").
Here is a function that can be used to read any of the logs and return the last
"$maxentries" that contain the event name:
declare function readLog($filename as xs:string, $maxentries as xs:integer,
$event as xs:string)
as xs:string*
{
try {
(: We need to restrict reading of logs to the Log
directory or this becomes an open door
to read any file on the host file system. :)
if (fn:contains($filename, "/") or
fn:contains($filename, "\"))
then fn:concat("Error: Invalid Log name specified: '",
$filename, "'")
else (
let $pathsep := if
(xdmp:platform()="winnt") then "\" else "/"
let $logdir :=
fn:concat(xdmp:data-directory(), $pathsep, "Logs", $pathsep)
let $logfile := fn:concat( $logdir,
$filename)
let $content :=
xdmp:filesystem-file($logfile)
(: split the output into individual entries
:)
let $entries :=
if
($event eq "")
then
fn:tokenize($content,"\n")
else
fn:tokenize($content,"\n")[fn:contains(., $event)]
let $i := fn:count($entries)
let $first := fn:max( (1, $i -
$maxentries) )
return $entries[$first to fn:last()]
)
}
catch ($e) {
fn:concat("Exception thrown reading log: ",
$e/error:format-string/text() )
}
};
Note that if you pass an empty event name it will return the last entries of
the log file.
If you wrap your message in an element name like this:
declare function logInfo($evtid as xs:string, $values as item()*)
as item()*
{
let $msg := element message { $values }
return fn:trace( $msg, $evtid )
};
Use xdmp:unquote() on the <message> after the event string and you have all the
power of XQuery for further processing.
Let me know if that helps.
Keith L. Breinholt
[email protected]<mailto:[email protected]>
From: [email protected]
[mailto:[email protected]] On Behalf Of isa ran
Sent: Wednesday, March 10, 2010 7:57 AM
To: [email protected]
Subject: [MarkLogic Dev General] working with .txt file in MarkLogic
Hi,
Can we load and update a .txt file using MarkLogic/generic xquery functions in
Marklogic?
Something similar to a ErrorLog.txt and using xdmp:log()......
to be specific a customized log file for the application rather than using the
ErrorLog.txt.
I don't mind if the .txt file is in the filesystem or the Marklogic database.
Thanking you,
isa.
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