pylebecq / examples-node

Examples of workflows implemented in node.js using Zenaton

Zenaton examples for Node.js

This repository contains examples of workflows built with Zenaton. These examples illustrates how Zenaton orchestrates tasks that are executed on different workers.

Installation

Download this repo

git clone https://github.com/zenaton/examples-node.git

and install dependencies

npm install

then add an .env file

cd examples-node; npm install ; cp -n .env.example .env

and populate it with your application id and api token found here.

Then, you need to install a Zenaton worker

curl https://install.zenaton.com | sh

and start it, and make it listen to your configuration:

zenaton start; zenaton listen --env=.env --boot=boot.js

Your all set!

Your workflows will be processed by your worker, so you won't see anything except the stdout and stderr, respectively zenaton.out and zenaton.err. Look at these files :)

Example 1 : Sequential tasks execution

This example showcases

• a sequential execution of two tasks. The second task is executed only when the first one is processed.
• In a sequential task execution, you can get the output of a task. The result of the first task can be used by the second one.

node launch_sequential.js

Example 2: Parallel tasks execution

This example showcases

• a parallel execution of 2 tasks
• a third task that is executed only after both first two tasks were processed

node launch_parallel.js

Example 3: Asynchronous tasks execution

this example showcases

• An asynchronous execution of a task A (fire and forget)
• Then a sequential execution of Task B

node launch_asynchronous.js

When a task is dispatched asynchronously, the workflow continues its execution without waiting for the task completion. Consequently, a task asynchronous dispatching always returns a null value.

Example 4: Event

This example showcases

• how to change a workflow's behaviour based on an external event

node launch_event.js

Example 5: Wait

This example showcases

• how the provided Wait task can be used to pause the workflow for a specified duration

node launch_wait.js

Example 6: Wait Event

This example showcases

• how the provided Wait task can also be used to pause the workflow up to receiving a specific external event

node launch_wait_event.js

Example 7: Recursive Workflow

This example showcases

• how launching events or workflows directly from orchestrated tasks allows you to schedule recurring workflows

node launch_recursive.js

Example 8: Workflow Versions

This example showcases

• how to update your workflow implementation, even while previous versions are still running

node launch_version.js