# SSE Item Store Jersey Example

An example demonstrating how Server Sent Events (SSE) Jersey support can be used to notify clients about changes in server-side managed data (collection of items). The example also outlines how SSE events can be consumed using javascript browser-based clients.

## Contents

The example consists of a web-based client application and a server-side application deployed on a Jetty servlet container.

The server side part of the application consists of a JAX-RS resource managing collection of string items and a simple HTML page that includes a browser SSE client written in Javascript as well as a basic CSS stylesheet. The SSE Javascript client connects to the JAX-RS resource and transforms the streamed messages into HTML code that is rendered by the browser. The javascript client also demonstrates how named and unnamed SSE events are handled by HTML5 `EventSource` component. The mapping of the URI path space of the server-side part of the application is presented in the following table:

URI path | Resource class | HTTP methods
--- | --- | ---
`/resources/items` | `ItemStoreResource` | `GET, POST`
`/resources/items/events` | `ItemStoreResource` | `GET (SSE)`

Application is configured to run using Jetty maven plugin under base path `sse-item-store-webapp`.

## Running the Example

> `mvn clean compile jetty:run`

The command above deploys the current example. After successful deployment, you should be able to access the browser SSE client page at http://localhost:8080/sse-item-store-webapp/index.html. To see the raw SSE event stream, you may also point your browser directly at the `ItemStoreResource`.

## Deploying the example to another servlet container.

> `mvn clean package`

The command above creates a Servlet 3.x compliant WAR located in the target directory. The WAR can be then deployed to your Servlet 3.x compliant container.