C# Class Examples.ControlClientUpdatingJSONTopics

This example shows a control client creating a JSON topic and sending updates to it. There will be a topic for each currency for which rates are provided. The topic will be created under the FX topic - so, for example FX/GBP will contain a map of all rate conversions from the base GBP currency. The rates are represented as string decimal values (e.g. "12.457"). The addRates method shows how to create a new rates topic, specifying its initial map of values. The changeRates method which takes a map shows how to completely replace the set of rates for a currency with a new map of rates. The changeRates method which takes a string shows an alternative mechanism where the new rates are simply supplied as a JSON string. Either of the changeRates methods could be used and after the first usage for any topic the values is cached, and so subsequent set calls can compare with the last value and send only the differences to the server.

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Public Methods

Method	Description
AddRates ( string currency, string>.IDictionary values, ITopicControlAddContextCallback callback ) : void	Add a new rates topic.
ChangeRates ( string currency, string>.IDictionary values, ITopicUpdaterUpdateContextCallback callback ) : void	Update and existing rates topic, replacing the rates mappings with a new set of mappings.
ChangeRates ( string currency, string jsonString, ITopicUpdaterUpdateContextCallback callback ) : void	Update an existing rates topic, replacing the rates mappings with a new set of mappings specified as a JSON string, for example {"USD":"123.45","HKD":"456.3"}.
ControlClientUpdatingJSONTopics ( string serverUrl ) : System	Constructor.
close ( ) : void	Close the session.
removeRates ( string currency, ITopicControlRemoveContextCallback callback ) : void	Remove a rates entry (remove its topic) and clear cached value for the topic.

Private Methods

Method	Description
MapToJSON ( string>.IDictionary values ) : IJSON	Convert a given map to a JSON object.
RateTopicName ( string currency ) : string	Generate a hierarchical topic name for a rates topic. e.g. for currency=GBP would return "FX/GBP".

Method Details

AddRates() public method

Add a new rates topic.

public AddRates ( string currency, string>.IDictionary values, ITopicControlAddContextCallback callback ) : void
currency	string	the base currency
values	string>.IDictionary	the full map of initial rates values
callback	ITopicControlAddContextCallback	reports outcome
return	void

ChangeRates() public method

Update and existing rates topic, replacing the rates mappings with a new set of mappings.

public ChangeRates ( string currency, string>.IDictionary values, ITopicUpdaterUpdateContextCallback callback ) : void
currency	string	the base currency
values	string>.IDictionary	the mew rates values
callback	ITopicUpdaterUpdateContextCallback	reports outcome
return	void

ChangeRates() public method

Update an existing rates topic, replacing the rates mappings with a new set of mappings specified as a JSON string, for example {"USD":"123.45","HKD":"456.3"}.

public ChangeRates ( string currency, string jsonString, ITopicUpdaterUpdateContextCallback callback ) : void
currency	string	the base currency
jsonString	string	a JSON string specifying the map of currency rates
callback	ITopicUpdaterUpdateContextCallback	reports outcome
return	void

ControlClientUpdatingJSONTopics() public method

Constructor.

public ControlClientUpdatingJSONTopics ( string serverUrl ) : System
serverUrl	string	for example "ws://diffusion.example.com:80"
return	System

close() public method

Close the session.

public close ( ) : void
return	void

removeRates() public method

Remove a rates entry (remove its topic) and clear cached value for the topic.

public removeRates ( string currency, ITopicControlRemoveContextCallback callback ) : void
currency	string	the currency to be removed
callback	ITopicControlRemoveContextCallback	reports the outcome
return	void