Run Java Code

This handler (com.rierino.handler.OpenHFTEventHandler) provides ability to load and execute dynamic Java event handler codes during runtime.

Handler Parameters

Parameter	Definition	Example	Default
code.state	Name of the state manager storing code definitions	customCodes	handler_code
code.domain	Category of codes within the code state manager that can be used by this handler	basket_operations	-
code.local.dir	Local directory to store dynamic codes	/tmp	java.io.tmpdir

Actions

Process / ProcessCode

Passes requested event to dynamic event handler for processing. Event metadata parameters applicable for this action are as follows:

Table

Parameter	Definition	Example	Default
Dynamic Handler	Name of the code handler to execute request	basket_operations	-
Dynamic Action	Name of the action to call on code handler	PriceBasket	-

JSON Schema

All parameters applicable for the selected code handler are also passed on by the OpenHFTEventHandler.

Codes

Handler codes provide ultimate flexibility in deploying new codes during runtime. These codes are typically deployed using an OpenHFTEventHandler and can be automatically recompiled and put to use in production with a code pulse or journal.

It is possible to extend the languages that are supported for dynamic handler codes with new event handlers. Rierino is shipped with dynamic code deployment for Java with the following properties:

• Name: Descriptive name of the handler code

• Status: Whether the handler code should still execute or not

• Description: Detailed explanation of the code contents

• Domain: Business domain for the handler code

• Class: Fully classified classname for the handler code (e.g. com.rierino.handler.dynamic.ExampleEventHandler)

• Dependencies: List of Jar files and locations of dependencies of this code, which are also loaded during runtime

• Code: Complete code for the handler implementation

While using a pre-compiled deployment is a better practice, dynamic handler coding allows for faster deployment of mission critical changes or simpler CI/CD processes during development.