Progress update on May 26

Things done in the last week
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(1) Read Tuscany developers guide and "Extending Tuscany" slides

(2) Study the implementation of Atom binding (read the Atom implementation source, not have a clear idea yet)

(3) Read the implementation code of AXIS 2 binding (/incubator/tuscany/java/sca/modules/binding-ws-axis2) and refer to the "Extending Tuscany" slides. It seems make more sense than the Atom binding implementation, not yet sure why.

(4) Setup a SVN server for the project

(5) Build the Wiki page for the project

http://cwiki.apache.org/confluence/display/TUSCANYWIKI/Integrate+Google+services+in+SCA+compositions%28Apache+Tuscany%29


Things to do in the next week
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(1) Ask questions in the Dev list about binding extension in Tuscany

(2) Keep reading the documents and code, and have a better understanding how binding extension works

(3) If have a good understanding, start making the UML class diagram of the project

Proxy issue while installing tuscany plugin and coding GData clients

If you are connecting Internet via a Proxy server, here is what you need to read; otherwise if you are connecting to Internet directly, just ignore the following.

OK, let's assume you are connecting to Internet via a Proxy server(Damn it! but this is life, live with it.....)

(1) Installation issue while using "Find and Install" in Eclipse to install the Tuscany plugin

Have tried thousands of times to install Tuscany plugin, did not work......want to kill yourself......then you wonder if the tuscany update site is down....well, nope......the update site is up......Now you realize you are using a proxy....yes, damned proxy.


OK, here it goes....Window->Preference->Search for "Proxy", then you got the network connections, configure your Proxy server...then you go.....Life is good, eventually.

(2) Connection issue while coding GData client programs

Ok, you have download all the jar files for GData client APIs, now you are ready to write some sample code using these APIs...Let's start with the "Code search API" sample code...Well, did not work....You got this "Connection refused: connect" exception......Why?......Oh, yeah, I know, the proxy, damned proxy again....Google a second...OK, easy....let's set up the proxy server "System.getProperties" in the proxy, four lines of code.....Yeah, it is working............

All right, the "Code search API" works, let's try the "Blogger API"....it is a little bit more complicated, requires username/pwd authentication......Ok, let's add the code for the proxy settings in "System.getProperties"......Wait a second........No longer working......."AuthenticationException: Error connecting with login URI"........What the heck......My username/pwd is absolutely correct, you know after I check and recheck this for another 200 times.....Why??????......

OK, let me tell you......Only specify the proxy server information in the client seems not good enough.......The client is calling other classes in the GData client API.....And these classes might also need to connect to the server via the internet connection......What can I do.....I do not wanna modify these classes in the API......

Here is what you do........If you are using eclipse.....go to "Run As"->"Open Run Dialog"->"Arguments"->"VM Arguments".... Put these there

-Dhttp.proxyHost=yourProxyServerAddress -Dhttp.proxyPort=youProxyPortNumber -Dhttps.proxyHost=yourProxyServerAddress -Dhttps.proxyPort=youProxyPortNumber

If you are not using Eclipse, you know where you specify VM arguments...

That is it for tips today....Good luck

Progress Update on May 19

Things done in the last week
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(1) Reading documents of SCA specification and Java SCA Documentation(User guide, Developer guide)

(2) Reading documents of GData API(Core Data API document)

(3) The Tuscany SCA Java 1.2 is installed and tried out with the "store sample"

(4) GData client API is downloaded and tried out with the Google Calendar service.

(5) Tuscany SCA Java source code is downloaded and the "Hello Word" development environment is ready.


Things to do in the next week
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(1) More reading about SCA developers guide

(2) Study the implementation of Atom binding

(3) Try to have a good understanding of the "binding extension" part, and if comfortable and confident, start designing the UML class diagram. The implementation of Atom binding is a good place to learn from

Project Blog Created

This is the project blog site for the project of Gdata binding for Tuscany. The project is a GSoC project associated with Apache Tuscany(Sponsored by Google, Google Summer of Code).

This project will mainly focus on adding GData binding to Tuscany to allow users to integrate SCA compositions with Google services, and in a wider range, any other web accessible application and service with GData, Atom or RSS as the data representation. Tuscany is an evolutionary framework of SOA, and GData binding will be a necessary and significant reinforcement of the system.

Service oriented architecture (SOA) aims to deliver a loosely-coupled, highly-reusable, composable and adaptive infrastructure for enterprise applications. An essential characteristic of SOA is the ability to assemble existing services to create new applications that may consist of different technologies. As an implementation of SCA (Service Component Architecture), Tuscany delivers a powerful and flexible framework to simplify development, assembly, deployment and management of composite applications in SOA. It assembles new and existing services to create brand new applications that may consist of different technologies such as such as BPEL, Spring, and SCA’s Java component model. One of its outstanding features is the ability to support a variety of languages, bindings and component types in a consistent way.

Tuscany supports the binding of a variety of formats including EJB, WS-AXIS2 and etc. Unfortunately, GData is not yet supported by Tuscany. Compared with Atom and RSS, GData provides a general model to fetch feeds form resources, query information of interests in the feeds and represent results. GData Users can also perform updates to any service that has a GData interface while supporting optimistic concurrency and authentication.

The project progress and milestone events will be blogged here, stay tuned and more details will be coming...