Correlator status lines allow you to monitor the runtime operational status of a running correlator. When a project is running, correlator status lines are logged every 5 seconds when you start the correlator.
You can specify the interval at which the correlator logs status lines by providing the --logQueueSizePeriod option when you start the correlator. Where to look for status log lines
The default behavior when a correlator is run from the command line is for the correlator log (which includes the status information) to be written to standard output.… Read More
The latest release of Apama Community Edition provides two new connectivity plug-ins, an MQTT transport and a native JSON Codec. MQTT Transport
This connectivity plug-in is a transport for the MQTT protocol (see http://mqtt.org/). MQTT is an extremely lightweight publish/subscribe messaging transport used widely by IoT devices. This allows the Apama correlator to send and receive events from a remote system via an MQTT broker, such as Software AG Universal Messaging.… Read More
Apama provides various command line tools that can be used to monitor and manage correlators. In this blog post, we will discuss some of them, focusing on how to use them and for what purposes. The command line tools provide various options which can be viewed by appending --help after the tool name, for example, correlator --help, engine_inject --help etc. We recommend using the Apama Command Prompt available from the Start Menu which ensures that the environment variables are set correctly.… Read More
The latest version of Apama Community Edition has arrived bringing many improvements including new connectivity options, enhancements to EPL and support for additional platforms. Apama Community Edition core components
The Apama Community Edition core components form a lightweight Apama package that makes it easy to create re-distributable projects based on Apama. The core components do not include any of the commercial third party components that would restrict your freedom to include the Apama Streaming Analytics engine in your own re-distributable projects.… Read More
Unit tests play a crucial role in tightening the developer feedback loop. They enable developers to receive fast feedback on the validity of their application’s behaviour, and can assist with development processes such as TDD. Whilst not replacing the need for system tests, unit tests contribute to the suite of testing methods available, helping developers create elegant, reliable code.
AUnit is a unit test and packaging tool for Apama. Unit tests are written directly in EPL, enabling developers to introspect and assert their application at an event object level.… Read More
The Raspberry Pi is a great little computer that can now run Apama with the release of the Community Edition Core components. And one of the great things about the Raspberry Pi is the way in can interact with real world ‘things’ using it’s GPIO pins, such as LEDs, buttons, buzzers, etc. To connect Apama to the GPIO pins on the Raspberry Pi we have created the GPIO Plugin which will allow a user to easily monitor and respond to changes on the GPIO pins.… Read More