Posts Tagged ‘WebSockets’

MAF and WebSockets Integration – Live Twitter Stream by Andrejus Baranovskis

Posted: June 23, 2015 in Uncategorized
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clip_image002MAF and WebSockets – I will describe how it works together. WebSockets is a protocol providing full-duplex communication channel over a TCP connection. This channel is interactive (communication is both ways) and we can send messages from the server to the client (MAF application running on the device). There is no need to use push notifications, WebSockets provide JSON support and allow to send complex payload data. In a way it competes with REST, however REST is different with request is being initiated by the client. WebSockets data is received automatically – there is no need to trigger any event by the client.
I have implemented sample MAF application with WebSockets integration, you can download it here – AltaMobileApp_v1.zip. Finance screen in the application contains MAF output text component. This component displays latest data received through WebSockets channel. Server side is listening for live Twitter Stream updates and sends each tweet location over WebSockets to the MAF application. See how it works in this screen recording: Read the complete article here.

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WebSocket Accelerated Live Data Synchronization for MAF by Andrejus Baranovskis

Posted: June 21, 2015 in JDeveloper & ADF, Mobile
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clip_image002New generation Mobile and Web applications are going to use WebSockets. This is one of the fastest and convenient ways to transfer JSON formatted data from the server to the client and back. Huge advantage – server could initiate data synchronisation request and deliver JSON messages directly to the client. You should read my previous post about detail information how to configure MAF with WebSocket – Oracle MAF and WebSockets Integration – Live Twitter Stream.
In this post I would like to describe, how to integrate further information received through WebSocket with MAF components. I will use MAF Tree Map UI component to display live data for Tweets locations.
Below you could see screen recording – MAF Tree Map is getting refreshed automatically, each time when update through WebSocket channel is being received. This is amazing, how fast data through WebSocket channel is coming. In this test, MAF is handling around 1 update per second, received from WebSocket: Read the complete article here.

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Using Java API for WebSockets in JDeveloper 12.1.3 by Eugene Fedorenko

Posted: March 14, 2015 in JDeveloper & ADF
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The latest release of JDeveloper 12c (12.1.3.0) along with WebLogic Server 12.1.3 came up with some new Java EE 7 features. One of them is support of JSR 356 Java API for WebSockets. Actually the WebSocket Protocol (RFC 6455) has been supported starting from 12.1.2.0 release, but it was based on WebLogic specific implementation of the WebSocket API. Now this proprietary WebLogic Server clip_image002WebSocket API has been deprecated. However, it is still supported for backward compatibility.
In this post I am going to show an example of using JSR 356 Java API for WebSockets in a simple  ADF application. The use case is about some sailing regatta which takes place in the Tasman Sea. There are three boats participating in the regatta and they are going to cross the Tasman Sea sailing from Australia to New Zealand coast. The goal of the sample application is to monitor the regatta and inform users about how it is going on, showing the positions of the boats on a map.
We’re going to declare a WebSocket server endpoint in the application and when a user opens a page a Java script function opens a new WebSocket connection. The application uses a scheduled service which every second updates boats coordinates and sends a message containing new boats positions to all active WebSocket clients. On the client side a Java script function receives the message and adds markers to the Google map according to the GPS coordinates. So, each user, interested in the regatta, is going to see the same updated picture representing the current status of the competition.

WebSocket server endpoint

Let’s start with declaring a WebSocket server endpoint. There is a small issue in the current implementation, which probably will be resolved in future releases. The WebSocket endpoints can not be mixed with ADF pages and they should be deployed in a separate WAR file. The easiest way to do that is to create a separate WebSocket project within the application and to declare all necessary endpoints in this project: Read the complete article here.

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Building a Smart Home Server by Using the Java EE 7 WebSocket API

Posted: February 4, 2015 in Community
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This tutorial shows you how to create an application that uses the WebSocket API for real-time communication between a client and a server. You learn how to:

  • Create a Java Platform, Enterprise Edition 7 (Java EE 7) application that uses the WebSocket API
  • Use the OnOpen and OnMessage WebSocket lifecycle events to perform different actions on the Java EE 7 application.
  • Define a client-side WebSocket endpoint by using JavaScript
  • Operate on Plain Old Java Objects (POJOs), in real-time, with actions invoked from a web browser client

Get the free tutorial here.

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ADF12c-WebSockets-SlidePresenterDemo by Lucas Jellema

Posted: January 2, 2015 in JDeveloper & ADF
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WebLogic 12c (12.1.2) has support for WebSockets. ADF 12c runs on WebLogic 12c. Therefore, we should be able to leverage that WebSockets support in an ADF application. And indeed we can, as this article describes. It will explain the creation of a simple application – the SlidePresenter – that allows users to select an image from a carousel. As soon as they make the selection, all currently connected clients are synchronized, showing the same slide: Read the complete article here.

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Using Java API for WebSockets in JDeveloper 12.1.3 by Eugene Fedorenko

Posted: December 26, 2014 in JDeveloper & ADF
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clip_image002Introduction

The latest release of JDeveloper 12c (12.1.3.0) along with WebLogic Server 12.1.3 came up with some new Java EE 7 features. One of them is support of JSR 356 Java API for WebSockets. Actually the WebSocket Protocol (RFC 6455) has been supported starting from 12.1.2.0 release, but it was based on WebLogic specific implementation of the WebSocket API. Now this proprietary WebLogic Server WebSocket API has been deprecated. However, it is still supported for backward compatibility.
In this post I am going to show an example of using JSR 356 Java API for WebSockets in a simple ADF application. The use case is about some sailing regatta which takes place in the Tasman Sea. There are three boats participating in the regatta and they are going to cross the Tasman Sea sailing from Australia to New Zealand coast. The goal of the sample application is to monitor the regatta and inform users about how it is going on, showing the positions of the boats on a map.
We’re going to declare a WebSocket server endpoint in the application and when a user opens a page a Java script function opens a new WebSocket connection. The application uses a scheduled service which every second updates boats coordinates and sends a message containing new boats positions to all active WebSocket clients. On the client side a Java script function receives the message and adds markers to the Google map according to the GPS coordinates. So, each user, interested in the regatta, is going to see the same updated picture representing the current status of the competition.

WebSocket server endpoint

Let’s start with declaring a WebSocket server endpoint. There is a small issue in the current implementation, which probably will be resolved in future releases. The WebSocket endpoints can not be mixed with ADF pages and they should be deployed in a separate WAR file. The easiest way to do that is to create a separate WebSocket project within the application and to declare all necessary endpoints in this project:

This is also important to set up a readable Java EE Web Context Root for the project: Read the complete article here.

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

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HTML5, WebSockets and Java EE 7 – Screencast by Adam Bien

Posted: November 20, 2014 in Glassfish, WebLogic
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clip_image002A simplest possible example for HTML – Java EE 7 communication using WebSockets. Watch the video here.

See also other screencasts at: http://tv.adam-bien.com or subscribe to http://www.youtube.com/user/bienadam.

See you at Java EE Workshops at Munich’s Airport, particularly at the Java EE User Interfaces or / and Java EE 7 and HTML 5 workshops!

WebLogic Partner Community

For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center.

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