de.griefed.serverpackcreator.spring.task

Class TaskHandler

java.lang.Object

de.griefed.serverpackcreator.spring.task.TaskHandler

@Service
public class TaskHandler
extends java.lang.Object

How to implement a task queue using Apache Artemis and Spring Boot
Huge Thank You to Gauthier for writing the above guide on how to implement a JMS. Without it this implementation of Artemis would have either taken way longer or never happened at all. I managed to translate their Kotlin-code to Java and make the necessary changes to fully implement it in ServerPackCreator.
TaskHandler class which determines what to do with all message in our JMS, depending on their task type and content of the message.

Constructor Summary

Constructors

Constructor and Description
TaskHandler(ConfigurationHandler injectedConfigurationHandler, ServerPackHandler injectedServerPackHandler, ServerPackService injectedServerPackService, TaskSubmitter injectedTaskSubmitter, ApplicationProperties injectedApplicationProperties) Constructor responsible for our DI.

Method Summary

Modifier and Type	Method and Description
void	handleGeneration(Task task) JmsListener listening to the destination tasks.background and selector type = 'generation', so only task that match the generation-type are worked with in this method. If a task is received that matches this type, the generation of a new server pack is started.
void	handleScan(Task task) JmsListener listening to the destination tasks.background and selector type = 'scan', so only task that match the scan-type are worked with in this method. If a task is received that matches this type, the CurseForge project and file ID of said task is checked for validity.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TaskHandler

@Autowired
public TaskHandler(ConfigurationHandler injectedConfigurationHandler,
                              ServerPackHandler injectedServerPackHandler,
                              ServerPackService injectedServerPackService,
                              TaskSubmitter injectedTaskSubmitter,
                              ApplicationProperties injectedApplicationProperties)

Constructor responsible for our DI.

Parameters:

injectedConfigurationHandler - Instance of ConfigurationHandler.

injectedServerPackHandler - Instance of ServerPackHandler.

injectedServerPackService - Instance of ServerPackService.

injectedTaskSubmitter - Instance of TaskSubmitter.

injectedApplicationProperties - Instance of ApplicationProperties.

Method Detail

handleScan

@JmsListener(destination="tasks.background",
             selector="type = \'scan\'")
public void handleScan(Task task)

JmsListener listening to the destination tasks.background and selector type = 'scan', so only task that match the scan-type are worked with in this method.
If a task is received that matches this type, the CurseForge project and file ID of said task is checked for validity. If the combination is found valid, either a new entry is saved to the database or an already existing one updated, if the existing one has the status Generating and lastModified is bigger than 30 minutes. In either case, a GenerateCurseProject-task is sent which will then generate a server pack from the CurseForge project and file ID combination.

Parameters:

task - The task for which to check the CurseForge project and file ID, as well as status.

handleGeneration

@JmsListener(destination="tasks.background",
             selector="type = \'generation\'")
public void handleGeneration(Task task)

JmsListener listening to the destination tasks.background and selector type = 'generation', so only task that match the generation-type are worked with in this method.
If a task is received that matches this type, the generation of a new server pack is started.

Parameters:

task - The task with which to generate a server pack from a CurseForge project and file ID.