Re: [Condor-users] ClassAd syntax in condor_advertise

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

Jan Ploski wrote:
> Hello,
>
> What is the relationship of the syntax that can be used in ClassAd files 
> for condor_advertise of 6.8.7 and the native ClassAd language syntax as 
> specified in the ClassAd Language Reference Manual 
> (http://www.cs.wisc.edu/condor/classad/refman/)?

Similar, but unfortunately different.

There are currently two versions of the ClassAd language floating about. 
 The one you mention above is the syntax for the standalone ClassAd 
libraries available on our website.

Unfortunately for a bunch of (mostly historical) reasons, the Condor 
system does not currently use these ClassAd libraries.  It uses an older 
implementation that has slightly different syntax.  The biggest 
difference is the ClassAd syntax inside Condor does not support some 
literal value types including sets, time, and nested classads.  Also, 
although both versions support a very similar set of built-in functions, 
some of the functions differ due to these typing differences.

Details on the ClassAd syntax used inside of Condor can be found in the 
Condor Manual section 4.1, available online at :

  http://www.cs.wisc.edu/condor/manual/v6.9/4_1Condor_s_ClassAd.html

> When I try specifying 
> attributes like foo = [ a=1; b=2 ] or bar = { 1, 2, 3 }, condor_advertise 
> rejects them, telling me that it "couldn't parse ClassAd".

Right, because the ClassAd implementation inside of Condor does not 
support sets.  It does, however, support "strings that contain a list", 
so you can do stuff like
   bar = "1, 2, 3, 7, 6.4, 32, 0"
and then use all sorts of handy built-in functions like the below; see 
the Manual for more details.  The stringList family of functions inside 
of Condor is kind of a substitute for the more formal set functions 
found in the later versions of ClassAds.

Hope this helps,
Todd.

Integer stringListSize(String list [ , String delimiter ])
    Returns the number of elements in the string list, as delimited by 
the optional delimiter string. Returns ERROR if either argument is not a 
string.


Integer stringListSum(String list [ , String delimiter ])
OR Real stringListSum(String list [ , String delimiter ])
    Sums and returns the sum of all items in the string list, as 
delimited by the optional delimiter string. If all items in the list are 
integers, the return value is also an integer. If any item in the list 
is a real value (noninteger), the return value is a real. If any item 
does not represent an integer or real value, the return value is ERROR.

Real stringListAve(String list [ , String delimiter ])
    Sums and returns the real-valued average of all items in the string 
list, as delimited by the optional delimiter string. If any item does 
not represent an integer or real value, the return value is ERROR. A 
list with 0 items (the empty list) returns the value 0.0.

Integer stringListMin(String list [ , String delimiter ])
OR Real stringListMin(String list [ , String delimiter ])
    Finds and returns the minimum value from all items in the string 
list, as delimited by the optional delimiter string. If all items in the 
list are integers, the return value is also an integer. If any item in 
the list is a real value (noninteger), the return value is a real. If 
any item does not represent an integer or real value, the return value 
is ERROR. A list with 0 items (the empty list) returns the value UNDEFINED.

Integer stringListMax(String list [ , String delimiter ])
OR Real stringListMax(String list [ , String delimiter ])
    Finds and returns the maximum value from all items in the string 
list, as delimited by the optional delimiter string. If all items in the 
list are integers, the return value is also an integer. If any item in 
the list is a real value (noninteger), the return value is a real. If 
any item does not represent an integer or real value, the return value 
is ERROR. A list with 0 items (the empty list) returns the value UNDEFINED.

Boolean stringListMember(String x, String list [ , String delimiter ])
    Returns TRUE if item x is in the string list, as delimited by the 
optional delimiter string. Returns FALSE if item x is not in the string 
list. Comparison is done with strcmp(). The return value is ERROR, if 
any of the arguments are not strings.

Boolean stringListIMember(String x, String list [ , String delimiter ])
    Same as stringListMember(), but comparison is done with stricmp(), 
so letter case is not relevant.

Boolean stringListRegexpMember(String pattern, String list [ , String 
delimiter ] [ , String options ])
    Returns TRUE if any of the strings within the list is a regular 
expression as described by pattern. Returns FALSE otherwise. If any 
argument is not a string, or if pattern does not describe a valid 
regular expression, returns ERROR. To include the fourth (optional) 
argument options, a third argument of delimiter is required. A default 
value for a delimiter is " ,".


> Regards,
> Jan Ploski
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--
Todd Tannenbaum                       University of Wisconsin-Madison
Condor Project Research               Department of Computer Sciences
tannenba@xxxxxxxxxxx                  1210 W. Dayton St. Rm #4257
Phone: (608) 263-7132                 Madison, WI 53706-1685