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In recent years, systems that have been developed using event-based (also referred to as message-oriented) middleware platforms have become widespread. A Gartner study determined that the market size for message-oriented-middleware licenses was about $1 billion in 2005. In event-based systems, components do not directly call other components via explicit references, but instead use implicit invocation to transfer data and notifications of events by sending messages. Software connectors, e.g., event buses or brokers, then route these messages to the correct recipients. Messages are either broadcast to certain component groups or sent to recipients who previously subscribed to them.
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