Which meaning of "subscribe" is used here?
"In event-based architectures, processes essentially communicate through the propagation of events, which optionally also carry data, as shown in Fig. 2-2(a). For distributed systems, event propagation has generally been associated with what are known as publish/subscribe systems (Eugster et aI., 2003)."
It means to register one's desire to receive notification of certain kinds of event. g. a newspaper or periodical, meaning that one wishes to receive every issue.
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It means to register one's desire to receive notification of certain kinds of event. This is a specialised computing sense that developed from the everyday sense of subscribing to e.g. a newspaper or periodical, meaning that one wishes to receive every issue.