Event handling in distributed event handling systems

An apparatus configured to support handling of events by a host of an event handling system, the apparatus comprising:

• a processor and a memory communicatively connected to the processor, the processor configured to:
• subscribe, by the host, to a first event queue of a message bus, the first event queue of the message bus configured to store events of a first event type to be processed by a first event processing function of the host;
• subscribe, by the host, to a second event queue of the message bus, the second event queue configured to store events of a second event type to be processed by a second event processing function of the host;
• maintain, by the host, a local buffer configured to store events received from the first event queue of the message bus and events received from the second event queue of the message bus;
• and
• retrieve, by the host based on a local queuing policy of the host and a local event retrieval condition detected at the host, a retrieved event comprising a first event from the first event queue of the message bus or a second event from the second event queue of the message bus.