Dynamic pipeline configuration

Functions
	config.set_methods (var methods_table)
	Set the methods that should be used to implement the event callbacks. More...
	config.get_methods ()
	Get the methods that should be used to implement the event callbacks. More...
	config.set_regex (var regex_table)
	Set the regular expressions that are used by the pipeline. More...
	config.get_regex ()
	Get the regular expressions that are used by the pipeline. More...
	config.set_file (var filename)
	Set the file that contains all the event callbacks. More...
	config.get_file ()
	Get the filename of the file that contains the event callbacks. More...
	config.commit ()
	Commit and activate a configuration. More...
	config.clear_required_fields ()
	Clear all the required fields for the pipeline. See required-fields.
	config.add_required_field (var field)
	Add a new required field to the pipeline. See required-fields. More...

Detailed Description

The methods in this package provide access to the configuration of a pipeline script.

These methods operate on a config object as returned by system_get_pipeline() As a result, the colon (':') operator should be used.

Function Documentation

config.add_required_field

(

var

field

)

Add a new required field to the pipeline. See required-fields.

Parameters

field

- Name of field to add

config.commit

(

)

Commit and activate a configuration.

Returns

status, errmsg

If status == 0, then the operation has succeeded. If status == -1, then the operation has failed and errmsg will contain a status string.

This function will causes a configuration to take effect.

config.get_file

(

)

Get the filename of the file that contains the event callbacks.

Returns

Filename of the pipeline script

config.get_methods

(

)

Get the methods that should be used to implement the event callbacks.

Returns

The method table for the pipeline

Note

This method is not officially supported at present

config.get_regex

(

)

Get the regular expressions that are used by the pipeline.

Returns

A table containing details of the regular expressions

config.set_file

(

var

filename

)

Set the file that contains all the event callbacks.

Parameters

filename

- Filename of the pipeline script

The filename is applied to all the methods (as configured using the set_methods() method), it is not possible to implement different callbacks in different script files for the same pipeline.

config.set_methods

(

var

methods_table

)

Set the methods that should be used to implement the event callbacks.

Parameters

methods_table

- Table of methods

Returns

Note

This method is not officially supported at present

The table of methods can contain the following members:

table.initialise
table.update
table.nodata
table.status
table.request
table.discard

Thus to set the update callback on the pipeline named "example", the following code snippet could be used:

local config = system.get_pipeline("example")

-- Retrieve the current methods, and modify the update callback
local methods = config:get_methods()
methods.update = "new_update_function"
config:set_methods(methods)

-- Commit and activate the new configuration
config:commit()

config.set_regex

(

var

regex_table

)

Set the regular expressions that are used by the pipeline.

Parameters

regex_table

- Table of regular expressions

The table should comprise of key/value pairs where the key is the regular expression and the value is one of the following: "listener-include", "listener-exclude", "provider-include" and "provider-exclude".

For example, the following snippet will reconfigure the "example" pipeline so that is additionally accepts symbols within /L hierarchy:

local config = system.get_pipeline("example")

-- Retrieve the current methods, and modify the update callback
local regex = config:get_regex()
regex["^/L"] = "listener-include"
config:set_regex(regex)

-- Commit and activate the new configuration
config:commit()