...

S4:incubator-s4$ ./gradlew s4-tools:installApp
.... verbose logs 
...:s4-tools:installApp

...

Create a new application

S4 provides some scripts in order to simplify development and testing of applications. Let's see how to create a new template project and start a new sample application.

Create a new project

1. Create a new application template (here, we create it in the /tmp directory): 

   Code Block
   S4:incubator-s4$ ./s4 newApp myApp -parentDir=/tmp ... some instructions on how to start ...

2. This creates a sample application in the specified directory, with the following structure:

   Code Block
   build.gradle --> the template build file, that you'll need to customize gradlew --> references the gradlew script from the S4 installation s4 --> references the s4 script from the S4 installation, and adds an "adapter" task src/ --> sources (maven-like structure)

A look at the sample project content

• The src/main/java/hello directory contains 3 files: 

  Code Block
  HelloPE.java --> a very simple PE: simply prints the name contained in incoming events HelloApp.java --> defines a simple application: exposes an input stream ("names"), connected to the HelloPE HelloInputAdapter --> a simple adapter that reads character lines from a socket, converts them into events, and sends the events to interested S4 apps

...

• , through the "names" stream