Abstract: There is provided method of centralized control of event messages for accessing services by processes that generate event messages, comprising: monitoring event messages from an event broker server of a distributed event streaming technology service monitoring a central event dataset storing the event messages streamed over a network from the processes for accessing the services, counting a number of event messages for combination(s) of event attribute(s) according to set(s)-of-rules, dynamically generating a lock that includes instructions for blocking the event messages having the certain combination of event attributes(s) in response to the number reaching a threshold for a certain combination of event attribute(s), and dynamically providing the lock to each process that generates event messages having the combination of event attribute(s), wherein each process is configured for implementing the lock for locally blocking the event messages having the certain combination of event attribute(s).

Abstract: A method comprising using at least one hardware processor for: receiving first a set of keywords associated with a first advertising platform; receiving second a set of keywords associated with a second advertising platform; defining binary relations between the first and second sets of keywords; applying formal concept analysis (FCA) to the binary relations, to produce a concept lattice; and updating the concept lattice responsive to changes in the first or second sets of keywords.