Java Cadence Samples for OSS Presentation

This package contains two samples demoed at Open Source Summit Europe (OSSEU)

More Cadence info at:

• Cadence Service
• Cadence Java Client
• Go Cadence Client

Overview of the Samples

Money Transfer Sample

Demonstrates a simple transfer from one account to another.

Money Batch Transfer Sample

A single deposit after multiple withdrawals. Demonstrates that workflow is stateful.

Get the Samples

Run the following commands:

  git clone https://github.com/mfateev/presentation-java-samples.git
  cd presentation-java-samples

Import into IntelliJ

In the IntelliJ user interface, navigate to File->New->Project from Existing Sources.

Select the cloned directory. In the Import Project page, select Import project from external model, choose Gradle and then click Next->Finish.

Build the Samples

  ./gradlew build

Run Cadence Server

Run Cadence Server using Docker Compose:

curl -O https://raw.githubusercontent.com/uber/cadence/master/docker/docker-compose.yml
docker-compose up

If this does not work, see the instructions for running Cadence Server at https://github.com/uber/cadence/blob/master/README.md.

Register the Domain

To register the sample domain, run the following command once before running any samples:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.common.RegisterDomain

See Cadence UI

The Cadence Server running in a docker container includes a Web UI.

Connect to http://localhost:8088.

Enter the sample domain. You'll see a "No Results" page. After running any sample, change the filter in the top right corner from "Open" to "Closed" to see the list of the completed workflows.

Click on a RUN ID of a workflow to see more details about it. Try different view formats to get a different level of details about the execution history.

Install Cadence CLI

Command Line Interface Documentation

Run the samples

Each sample has specific requirements for running it. The following sections contain information about how to run each of the samples after you've built them using the preceding instructions.

Don't forget to check unit tests found under src/test/java!

Money Transfer Sample

Workflow Worker:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneytransfer.AccountTransferWorker

Activities Worker:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneytransfer.AccountActivityWorker

Initiate Transfer:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneytransfer.TransferRequester

Money Batch Transfer Sample

Workflow Worker:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneybatch.AccountTransferWorker

Activities Worker:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneybatch.AccountActivityWorker

Initiate Transfer:

./gradlew -q execute -PmainClass=com.uber.cadence.samples.moneybatch.TransferRequester