One of the common questions we hear about Apama, and EPL, is: “How can I create derived classes?” The naive answer is “you can’t” – but let’s dig a little deeper.
First off, a little bit of background. Apama EPL doesn’t have classes – it has events. An event can have both data and methods (actions) but it is not a class. Among other things, this means that you can’t directly extend or inherit an event.… Read More
The latest version of Apama Community Edition has arrived bringing many improvements including new connectivity options, usability improvements for Apama queries and enhancements to EPL.… Read More
EPL Memory profiling is about investigating and analyzing an Apama application’s behavior to aid in optimizations for better memory usage and identifying any leaks. Apama’s capability to profile the EPL memory usage does provide a handy mechanism to identify any listener or object leaks used in the application within the correlator. Identifying such leaks could otherwise be a daunting task for any developer.
Note : Usage of the memory profiler is recommended during the development or debugging of an EPL application but, not when in production since it impacts the performance of the application.… Read More
The latest release of Apama Community Edition provides a new connectivity plug-in which is a transport allowing the Apama correlator to access REST or other web services. The transport is a client for other webservices, rather than allowing the correlator to act as a web service itself. In order to use the HTTP client transport you need to configure a chain within the connectivity system using the correlator configuration YAML. This chain provides the mapping between Apama events inside the correlator and HTTP requests/responses to the external web service.… Read More
Hopefully you will have seen our webinar which gave an insight into the type of applications that can be built rapidly with Apama Community Edition – if not – you can see it here. This post serves as an aid alongside that, briefly describing the application that was shown and supplying links to help you get started so that you can download, run and begin expanding and changing it to suit your needs.… Read More
In the rapidly expanding ecosystems of Complex Event Processing (CEP) and Event Stream Processing (ESP, also known as Stream Processing) together known as Streaming Analytics, Apama is no longer the only choice available. The world is becoming ever more digitized, and just as the data flows grow in number and depth, so must the solutions evolve to meet these greater challenges. With both large commercial organizations and the open source community all committing their own offerings, choosing the best has never been more involved.… Read More