TAILIEUCHUNG - Programming Without a Call Stack – Event-driven Architectures

Official’s blocks and paddles shall be utilized on each mat. An announcer and assistant announcer shall be utilized. Contestants shall be directed by the announcer to report directly to a specific mat. The announcer should read the age division and weight class first, next the names of the athletes and their state/club, then the mat number, and finally the names and mat number should be repeated. It is suggested that if semi-finals are conducted, they shall be run in flights by weight class following the conclusion of all pool finals. Medal matches shall be run in. | Programming Without a Call Stack -Event-driven Architectures Gregor Hohpe Most computer systems are built on a command-and-control scheme one method calls another method and instructs it to perform some action or to retrieve some required information. But often the real world works differently. A company receives a new order a web server receives a request for a Web page the right front wheel of my car locks up. In neither case did the system order processing web server anti-lock brake control schedule or request the action. Instead the event occurred based on external action or activity caused either by the physical world or another connected computer system. Could we change the architecture of our system to relinquish control and instead respond to events as they arrive What would such a system look like Events Everywhere The real world is full of events. The alarm goes off the phone rings the gas low warning light in the car comes on. Many computer systems especially embedded systems are designed to respond to events. The engine control computer in your car receives an event every time the crankshaft is at the zero position and starts the timer for another round of ignitions. As of now many of the systems that function based on external events live in a rather small universe most of them even invisible to the user. However as computer systems become more and more interconnected they start to publish and receive an increasing number of events. An order management system may receive orders from a Web site or an order entry application and notify other systems of the new order. Systems interested in new orders might be the financial system which will see whether the order is backed with a credit line or a valid credit card to charge and the warehouse which verifies that inventory to fulfill the order is present. Each of these systems might then publish another event to any interested party. The shipping system in turn might wait for both an .

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