Posts Tagged ‘asynchronous’

Using Deferred Objects and Promises with Java 8 and JDeferred

Sunday, September 27th, 2015

Promises may help us when dealing with asynchronous code and we need to merge, pipe or track the progress and the results of single parts of computation in our applications.

In the following tutorial I’d like to demonstrate a small library, JDeferred that helps us for this specific use case.


Testing Asynchronous Applications with Java and Awaitility

Sunday, August 23rd, 2015

Writing tests for asynchronous applications has never been much fun as we’re always struggling with the problem how to determine state changes, handle process terminations, dealing with timeouts or failures and stuff like this.

Awaitility eases this process for us offering a nice DSL, rich support for languages like Scala or Groovy and an easy-to-use syntax that’s even more fun when using it with Java 8′s lambda expressions.

In the following short introduction I’d like to demonstrate writing some tests different scenarios.


JAX-RS 2.0 REST Client Features by Example

Monday, December 30th, 2013

JAX-RS 2.0 aka JSR 339 not also specifies the API to build up a RESTful webservice but also enhances the client side API to easen up the process of writing a client for a REST service.

In the following tutorial we’re building up a client for a ready-to-play REST service and explore the different new options e.g. how to handle requests in a synchronous or asynchronous way, how to add callback handlers for a request, how to specify invocation targets to build up requests for a later execution or how to filter the client-server communication using client request filters and client response filters.


HTML5 Server Send Events using Node.js or Jetty

Sunday, October 21st, 2012

The HTML5 working draft describes different techniques to push information from a server to the client and the one described in this tutorial are Server-Send Events (SSE).

Using Server-Send-Events eliminates the need to poll a server periodically for information using AJAX and is really easy to implement because of the simple specification and the fact that nearly all modern browsers already implement this specification.


Message Driven Beans in Java EE 6

Sunday, June 5th, 2011

Message Driven Bean Tagcloud Message Driven Beans are no new concept due to the fact that they exist since EJB 2.0 but in Java EE 6 and the EJB 3.0 specification it is even more fun to use them.

In this tutorial we’re going to take a look at the specification and create an example application that transfers some objects via the Java Message Service to a Message-Driven Bean deployed on a GlassFish application server.

If you’re not interested in theory please skip to chapter 6 and directly start creating an application – otherwise we’ll begin with a short introduction into the JMS terminology and the concept of a Message-Driven-Bean..