ETALIS :: Event driven Transaction Logic Inference System</font>

Event File Management

To test ETALIS, enter an event program in the textarea below. Alternatively you can browse and upload a file that contains an event program. Press "Compile and Load" to make the program ready for execution. To execute a program, go to "Interactive Console". For help on the ETALIS syntax, see help

Select a file to upload an event program to ETALIS

Interactive Console

Loaded Event Program:

Execution:

Google Stocks Demo

ETALIS can apply aggregate functions while detecting complex events (in an incremental fashion). Aggregates over events are defined as aggregate(+Template,+EventPath,-Result) where Template can be any of the following: count, sum(Var), min(Var) , max(Var). In the following example, ETALIS computes the average of live Google's stock prices in an interval delimited by two events: start_compEvent and stop_compEvent.

%Examples of processing stock events from Google finance in ETALIS: %================================================================== %Calculates number of events, triggered in the delimited interval: counter_compEvent(Id,Counter):- ((db(company(Id)) * start_compEvent) * aggregate(count, stock(Id,Price,Volume)^* ,Counter) ) * stop_compEvent. %Calculates the sum of prices in events from the delimited interval: sum_compEvent(Id,Sum):- ((db(company(Id)) * start_compEvent) * aggregate(sum(Price), stock(Id,Price,Volume)^* ,Sum) ) * stop_compEvent. %Calculates the avrage price of Google's stocks in the delimited interval: avg(Id,Average):- (counter_compEvent(Id,Counter) /\ sum_compEvent(Id,Sum) ) * prolog(is(Average,Sum/Counter)). % Selects companies from Google financial service to apply the above rules: db(company('GOOG')).

Test the Google Stock demo. Use "Start" and "Stop" to create an interval in which the avrage price of Google stocks will be calculated.
To reset the current state of the engine, press 'reset ETALIS'.

Test with Synthetic Events

This demo demonstrates ETALIS capability to handle an event program (a set of event patterns) with respect to a given synthetically generated stream of events. To generate an input stream, set the number of distinguished event symbols and the number of total events in the stream. The achieved performance will be displayed in the right-hand side pane.

To load and compile an event program, use the 'Event File Management' tab.
A loaded program will be executed against previously generated event stream
by pressing 'Run'. To reset the current state of the engine, press 'reset ETALIS'.