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Davit Petrosyan edited this page Mar 11, 2021
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Work4j is an open-source library to create distributed, highly available job scheduler.
In Work4j, there are several central concepts such as:
- Job Definition: The data structure to define a "template" of a job that should run on a cluster.
- Job Execution: An object that represents desired job execution on one or more machines in the cluster.
- Iteration: A special structure that is created by a worker as a result of a single occasion of a particular job's execution.
- Cluster: A virtual group of machines or worker instances that the job execution is assigned to.
Rather than that, here are some important modules and their responsibilities:
- Scheduler Controller: The entry point for any job operations including defining jobs, executing them, reporting iterations, and cluster management.
- Scheduler Data Repository: The underlying data provider for the Scheduler Controller to act as an interim layer for storing and manipulating the scheduling data (jobs, executions, iterations, clusters, more).
- Worker Controller: An entry point for the worker application that is responsible to execute all the jobs assigned to the particular cluster according to their schedule or triggers.
- Scheduler Channel: An interface to act as a communication channel between worker and scheduler applications.
| Artifact | Group | Description |
|---|---|---|
| work4j-worker | io.imast | The package contains worker logic to execute jobs according to their schedule |
| work4j-controller | io.imast | The package contains the scheduler controller logic which allows to define, store, execute and manipulate jobs |
| work4j-model | io.imast | The package contains all the necessary models for defining or executing jobs |
| work4j-data | io.imast | The package contains a necessary data storage provider interface that can be implemented for a specific database |
| work4j-data-mongo | io.imast | The package implements work4j-data provider for the MongoDB database |
| work4j-channel | io.imast | The package contains main interfaces for worker-scheduler interaction including direct and event-driven communication |
| work4j-execution | io.imast | The package contains necessary interfaces for implementing the logic of a concrete job type and its behavior |