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Last modified: December 2007

URL: http://cxc.harvard.edu/chips4.0/check_server_exists.py.html

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AHELP for ChIPS 4.0 check_server_exists Context: py.chips

Synopsis

Determines if the specified server is currently running.

Syntax

check_server_exists(server_id)

Description

  • server_id - the id of the chips server to query; generally a string such as "ChipsServer_17334_1".

The check_server_exists command allows the user to verify that a chips server is running before attempting to connect to it. The call can be used while the client is already connected to a different server without having to first disconnect.

The routine returns True if the requested server exists and False otherwise. If the server does not exist, the routine may take several seconds to return a value, since the request needs to time out.

The list_servers command ("ahelp py.chips list_servers") can be used to find out all the ChIPS servers that are currently running on a machine.

Example

chips> check_server_exists("ChipsServer_17991_1")
True
chips> check_server_exists("ChipsServer_7358_1")
False

Two servers are checked: the first is running and the second doesn't exist.

Bugs

See the bugs pages on the ChIPS website for an up-to-date listing of known bugs.

See Also

py.chips
connect, create_server, disconnect, get_server_id, list_servers, lock, unlock
Last modified: December 2007


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