README.md

Exercise 4: Finale Workflow

One of the benefits of Temporal is that it provides SDKs for several languages and you can use multiple languages in the context of a single Workflow. For example, you might write your Workflow in Go but use Java or TypeScript for an Activity in that workflow.

The last exercise in this workshop does exactly that. The Workflow itself is written in Go, but the Activity that is executed as part of this Workflow is written in Java, as is the Worker that runs it. Since the Activity is written in Java, it's able to use a Java graphics library that would otherwise be would be incompatible with a typical Go program. Since the Workflow and Activities are implemented in two different languages, you'll need to start two Worker programs, one written in Java that will execute the Activity code and one written in Go that will execute the Workflow code.

GitPod Environment Shortcuts

If you are executing the exercises in the provided GitPod environment, you can take advantage of certain aliases to aid in navigation and execution.

Command	Action
ex4	Change to Exercise 4 Practice Directory
ex4j	Execute the Exercise 4 jar file Directory
ex4w	Execute the Exercise 4 Worker.
ex4st YOUR_NAME	Execute the Exercise 4 Starter, passing in your name. If you provide a name with spaces in it, be sure to enclose it in quotation marks. Ex: "Mason Egger"

Run the Activity Worker (implemented in Java):

In one terminal, run the following command:

$ java -classpath \
    java-activity-and-worker-1.1.jar \
    io.temporal.training.PdfCertWorker

Note: If you're using GitPod, you can run the shortcut ex4j

Run the Workflow Worker (implemented in Go):

In another terminal, run this command:

$ go run worker/main.go

Note: If you're using GitPod, you can run the shortcut ex4w

Start the Workflow (Go)

In another terminal, run the following command, but be sure to replace Mason Egger with your full name.

$ go run start/main.go "Mason Egger"

Note: If you're using GitPod, you can run the shortcut ex4st "Mason Egger"

• Once the workflow is complete, use the explorer view on the left side of the exercise environment to locate the file created by this workflow. It will have a name similar to 101_certificate_sally_jiang.pdf, only with your name in place of sally_jiang.
• Right-click its icon in the explorer view and choose Download....
• After you've downloading it to your computer, open it with your preferred PDF viewer.

Thank you for participating in Temporal 101!

This is the end of the exercise.