Unlike traditional information systems that work by issuing a request and wait for a response, event-driven system designed to process the events that occurred, allowing the system to observe, react dynamically, and provide personal data depends on the recipient and the situation. Event Processing in Action introduced the main concepts of event-driven architecture and shows how to use, design, and build event processing systems and applications. Because the pattern to connect the events that occurred in a system, this book also presents the pattern of event-general and explains how to detect and implement them.