Posts Tagged ‘ArcGIS Server Java’

ArcGIS Server Java Samples

July 14, 2008

I’m surprised to see lot of ArcGIS Server Java Samples posted in ArcScripts Section of ESRI.  This is really great news for Java Developers.

  1.  Custom Query : http://arcscripts.esri.com/details.asp?dbid=15676
  2. Hide Layers: http://arcscripts.esri.com/details.asp?dbid=15675
  3. Simple Routing Task: http://arcscripts.esri.com/details.asp?dbid=15675
  4. Search Attribute Task (with Source Code): http://arcscripts.esri.com/details.asp?dbid=15669       (Using ArcGIS Server 9.3)
  5. Bookmark Map Extent: http://arcscripts.esri.com/details.asp?dbid=15666
  6. Add Layers to mapservice :  http://arcscripts.esri.com/details.asp?dbid=15665
  7. Upload and Download Points, Lines and Polygons (CSV and WebGraphics) http://arcscripts.esri.com/details.asp?dbid=15624

.. and more java samples for reference. I guess ESRI started shifting their interest to Java too.

Technology Migration ArcGIS Server 9.2 to 9.3

June 19, 2008

This post higlights some points on technology migration from ArcGIS Server 9.2 to 9.3. Some one might ask, “Hello ..dude..why do you want this so early ?”.  ArcGIS 9.3 is expected to release by this July. So this would be ideal period to discuss on this. This will be helpful for those who wants to develop new application in 9.3 or redevelop/migrate the existing 9.2 application or atleast curious to know about new features in 9.3.

Yet 9.2 Web ADF have not been explored fully, atleast by myself. Now 9.3 is almost ready. I guess 9.2 released in November 2006. With in 2 years ESRI came up with brand new 9.3.  Web ADF in 9.2 has been under lot of critiscm from several folks though used widely. The ADF learning path is bit hard, thats the naked truth thats the reason everyone hate using 9.2 atleast in .NET. On Other hand Java ADF in 9.2 seems good but lacks documentation. I have not heared much annoyance/comments with respect to java.  Server is not so easy as conventional IMS.  ArcGIS Server provides extensive functionalities than IMS product. It all depends on your requirement and bussiness needs.  Lets get into topic without further noise.

In General, 9.3 ADF built on the same framework in 9.2 with a number of technology and performance enhancements have been incorporated in 9.3 to provide comprehensive platform. The core object model has undergone minor (believe so) changes.  ADF (.NET) is hybrid platform- mix of server side and client side development enviroment. Basic web controls like Map, TOC and Overview has been re-engineered and scriptable now.

Your migration options depend on whether you built a Web ADF application using the Web Mapping Application template (includes applications generated by Manager) or you build a custom Web ADF application without the template.  Below matrix explains the possiblities to upgrade.

9.2 to 9.2 Migration

 Key points for developers:

  • Using ASP.NET partial postback pattern instead of client callback. If you might written lot of code for TOC, rendering by now controls will take care of all your needs. Even if required, it will be on client side
  • Customised Web ADF Javascript libraries. Night mare on Javascript is gone. Developer can get full details of script along with neat documentation.
  • Custom tasks uses partial post back
  • Shallow stateful pattern is no longer supported in 9.3.  Developers should be aware of this. Because adding/removing layers done thru pooled server objects using shallow stateful concepts. Here 9.3 HTTP hanlder (ESRI.ArcGIS.ADF.Web.UI.WebControls.MapHandler) responsible for Map draw operations.
  • Understanding of REST or Javascript API is must.

Sailent features in 9.3 :

  1. Ready made utilities for migrating from 9.2
  2. ArcGIS JavaScript Extension for the Google Maps API
  3. ArcGIS JavaScript Extension for Virtual Earth
  4. Javascript is made public, documented, JSON based, and object oriented. Makes life easy for developer.  9.3 ADF will use JSON instead of XML for it’s communications between the client and server – this alone speeds things up ~30%
  5. Integration with other Javascript frameworks – like Dojo or ExtJS. This allows much more control over how the application looks and behaves.
  6. Improved Map Control, TOC and Overview control. Number of callbacks is reduced.
  7. The resource manager can be managed in Javascript, and has lots of configuration – i.e. layer aliases, fields to show, map tips etc.
  8. Results Viewer: bi-directional highlight. The task can have different results behavior (fields, map tips etc). Kudos!
  9. Additional web controls, additional AjaxExtenders – DockExtender, HoverExpandExtender (pin window type of thing)
  10. Use of HTTP Handlers used instead of pages so the page lifecycle is avoided, so it’s faster
  11. Blending at 9.2 used a single tiling scheme. At 9.3 each resource has it’s own tiling scheme, and the “blending has been massively improved”
  12. Javascript intellisense for Visual Studio 2008.
  13. Better templates and utility to convert previous version templates.
  14. Eliminated lots of callbacks, http handlers improve performance because the control tree is not re-created and destroyed
  15. Visual studio 2008 and .NET 3.5 framework supported
  16. Out-of-box printing tool and export using Adobe Acrobat Reader (PDF)
  17. ArcGIS Image Server is now an optional extension to ArcGIS Server
  18. Integration with Arc Web services
  19. ArcSDE is fully integrated with ArcGIS Server. SDE license bundled with Server.
  20. Windows Vista Support
  21. PostgreSQL support
  22. OGC specifications
  23. Much more…..

Hear the  Latest Podcasts on ArcGIS Server 9.3 from ESRI. CLICK HERE 

To summarise ArcGIS Server 9.3 seems improved much quality and performance wise.

  • Those who are new to Server and about to start development in 9.3 then donot look back web ADF at all.
  • If you are graduating from 9.2 and coming out of Web ADF then 9.3 REST/javascript API will be solace.
  • Are you about to migrate to 9.3 then look at both pros and cons. Don’t jump.

I thank fellow bloggers Dave, James Fee, Tom and others who helped me with valuable inputs. I dare to write this post because am NOT in beta evaluation. Hence people like me who look for similar information, this post may help. If there were any mistakes/omissions/additions or want of further details, please do comment or email me.

Chart Renderering using Web ADF

April 8, 2008

 

These are days am working with ArcGIS Server [9.2+SP3]- Java edition. I’ve started with ESRI samples and grown up to creating tasks for my application. Task framework is handy to create our own custom business logic with rich UI. I’m trying to recreate or mimic ‘Charts’ functionality similar to Arc Map.  User can select a layer (yet to code), field(s) and chart type to draw charts.   User has option to prevent overlap, change map base symbol color, field(s) color also. It works fine. No harm, charts draws fine. 

 

While I try to remove the rendering, I couldn’t do so. Later, When I investigated, chart rendering has been applied to the map service (i.e. on server objects) since it is pooled one. I have searched in forum/developers help, I learnt that com.esri.adf.web.data.renderer package has ONLY five classes WebClassBreakInfo, WebClassBreaksRenderer, WebSimpleRenderer, WebUniqueValueInfo, and WebUniqueValueRenderer.  The Chart Rendering option is NOT available with the web ADF.  My senior colleague who attended Dev Summit has explained me that only ArcIMS has this functionality through ArcXML using Chart Symbol Object and not in 9.2. ESRI will incorporate in 9.3 ;adding charts in graphics layer or from other source. This helps me that am working in right direction.

 

As a developer, you should not expect that everything can only done thru available methods/properties, sometimes we may need to use reverse logic to obtain desired result. One of my fellow colleague suggested that before applying chart rendering to layer object, feature renderer of the layer is stored temporarily once chart renderer is applied , web context is refreshed. Then now apply the feature renderer stored in temporary object to server object so that user can see the charts whereas a server object doesn’t get changed. This is simple and better idea for time being. 

 

There are several other interesting learning’s/findings in creating this task. I’ve used custom xsl from Daniel Garcia Roman Class break rendering. 

 

I’m facing some problems like how to update overview map dynamically when rendering type is changed, while changing radio events are not firing properly (I’ve to click twice). Yet to implement normalization, exclusions, orientation, size etc. For a developer who is fairly having good understanding of ArcObjects doing task is not so tough. Here, we are working with ArcObjects remotely. I always use VBA help to understand methods/properties of classes. Then try to migrate to java. Proper casting, creating objects in server context, error handling, using appropriate packages are very vital in server app development. I strongly feel that lack of samples in Developer help for Java as in .NET is a big handicap. We have depend on forums/experts  to understand certain basic issues.

 

 

Building JAVA Applications Using the ArcGIS Server Web ADF and AJAX (Dev Summit ’08)

February 28, 2008

Listen podcast from Jayant Sai, Developer, and Antony Jayaprakash, Product Engineer, ESRI on ArcGIS Server Web ADF intro

Listen here