Awesome

iwf-java-sdk

Java SDK for iWF workflow engine

See samples for how to use this SDK to build your workflow.

Requirements

• Java 1.8+

How to use

Here is the link to all the versions on Maven available to use. It gets replicated from staging repo after 30-60 minutes.

Also the Java docs for the latest version. For the latest version, MVN Repository website may have 1~2 days delay to show up.

Gradle

// https://mvnrepository.com/artifact/io.iworkflow/iwf-java-sdk
implementation 'io.iworkflow:iwf-java-sdk:2.5.+'

Maven

<!-- https://mvnrepository.com/artifact/io.iworkflow/iwf-java-sdk -->
<dependency>
    <groupId>io.iworkflow</groupId>
    <artifactId>iwf-java-sdk</artifactId>
    <version>2.5.+</version>
    <type>pom</type>
</dependency>

Concepts

To implement a workflow, the two most core interfaces are

• Workflow interface defines the workflow definition

• WorkflowState interface defines the workflow states for workflow definitions

A workflow can contain any number of WorkflowStates.

See more in https://github.com/indeedeng/iwf#what-is-iwf

How to build & run

Using IntelliJ

1. Check out the idl submodule by running the command: git submodule update --init --recursive
2. In "Build, Execution, Deployment" -> "Gradle", choose "wrapper task in Gradle build script" for "Use gradle from".
3. Open Gradle tab, click "build" under "build" to build the project

Development Guide

Update IDL

Run the command git submodule update --remote --merge to update IDL to the latest commit

Repo structure

• .github/workflows/: the GithubActions workflows
• iwf-idl/: the idl submodule
• script/: some scripts for GithubActions and testing
• src/: Java source code
  • main/java/io/iworkflow/core/: SDK code
    • command/: the command implementation
    • communication/: the communication implementation
    • mapper/: the mapper with IDL
    • persistence/: the persistence implementation
    • validator/: some validators
    • Client.java: the client implemntation
    • ...java ...
  • test/java/io/iworkflow/: Java test code (currently only integ test)
    • spring/: the integ test setup of using Spring as REST controller
    • integ/: the integration tests
      • XyzTest.java: a file for test cases
      • xyz/: the iWF workflow implementation for the integration test cases

Development Plan

1.0

• Start workflow API
• Executing start/decide APIs and completing workflow
• Parallel execution of multiple states
• Timer command
• Signal command
• SearchAttribute
• DataAttribute
• StateExecutionLocal
• Signal workflow API
• Get workflow DataAttributes/SearchAttributes API
• Get workflow API
• Search workflow API
• Cancel workflow API
• Reset workflow API
• InternalChannel command
• AnyCommandCompleted Decider trigger type
• More workflow start options: IdReusePolicy, cron schedule, retry
• StateOption: WaitUntil/Execute API timeout and retry policy
• Reset workflow by stateId/StateExecutionId

1.1

• New search attribute types: Double, Bool, Datetime, Keyword array, Text
• Workflow start options: initial search attributes

1.2

• Skip timer API for testing/operation
• Decider trigger type: any command combination

1.3

• Support failing workflow with results
• Improve workflow uncompleted error return(canceled, failed, timeout, terminated)

1.4

• Support PROCEED_ON_FAILURE for WaitUntilApiFailurePolicy

2.0

• Renaming some concepts/APIs with breaking changes(see releaste notes)
• Support workflow RPC

2.1

• Support caching on persistence

2.2

• Support atomic conditional complete workflow by checking signal/internal channel emptiness

2.3

• Support dynamic data/search attributes and internal/signal channel definition
• Support state options overridden dynamically
• Support describe workflow API

2.4

• Support execute API failure policy
• Support RPC persistence locking policy

2.5

• Add waitForStateExecutionCompletion API

2.6

• Small breaking changes to IdReusePolicy for fixing typo