Transcript Class Summary

Implementing Cloud-Based Productivity Solutions
with the AutoCAD® ObjectARX® API
Ravi Krishnaswamy
Senior Software Architect
© 2012 Autodesk
Class Summary
Goal: show how to leverage powerful web service based platforms and
applications in AutoCAD.
At the end of this class: one should have the basic tools and knowledge to
implement Arx applications with the cloud platform web services, such as
the Google APIs or any other cloud ‘Platforms as a Service’.
NOTE: This class includes several advanced programming topics
© 2012 Autodesk
Learning Objectives
At the end of this class, you will be able to:
 Implement an Arx application for Google Docs
 Learn about Google’s Data store – and differences from traditional data
stores
 Create an Arx app that uses the Google App Engine
 Learn about metering and costs of running a PaaS application
You will also learn about the open source libraries and tools used to
implement the solutions.
© 2012 Autodesk
ACAD.EXE
GDOCS.ARX
OAuth2
REST
Arx APIs
Spreadsheet API
JNI, Jersey, Jetty
Demo!
Google APP
ENGINE
Google DOCS
Scopes
Application registration
High Replication Data Store
GAE App deployment/frontends
© 2012 Autodesk
Libraries and Tools
© 2012 Autodesk
Java Tools and setup

Java SE http://www.oracle.com/technetwork/java/javase/downloads

JSE7 or JSE6

Eclipse http://www.eclipse.org/downloads/

JNI: Java to native

(add C:\Java\jre7\bin;C:\Java\jre7\bin\server) to path
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Google SDKs

Google Client APIs

http://code.google.com/p/google-api-javaclient/wiki/APIs#Google_OAuth2_API
 http://code.google.com/p/gdata-java-client/downloads/list
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Google App Engine SDK and Eclipse plugin


https://developers.google.com/appengine/downloads
https://developers.google.com/eclipse/docs/download
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Java Libraries

Jetty. Lightweight web server for OAuth2 authentication


http://www.eclipse.org/jetty/downloads.php
Jersey. Library to make REST implementation very easy.


http://jersey.java.net
http://jersey.java.net/nonav/documentation/latest/chapter_deps.html
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AutoCAD apis

AcDbTable Entity


setValue(), value(), setSize()
AcDbXrefGraph

AcDbXrefGraphNode, rootNode(), numOut(), out()
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The Docs API
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Create account, register id

http://accounts.google.com
 https://code.google.com/apis/console

Register for services
 Create credentials and client secret
© 2012 Autodesk
Scopes

https://developers.google.com/academy/apis/drive/driveapps/auth/scopes

https://developers.google.com/google-apps/spreadsheets/
private static final String[] scopes =
{
"https://www.googleapis.com/auth/userinfo.profile",
"https://www.googleapis.com/auth/userinfo.email",
"https://docs.google.com/feeds",
"https://spreadsheets.google.com/feeds"
};
© 2012 Autodesk
Authentication and Authorization

OAuth2
 https://developers.google.com/accounts/docs/OAuth2
 Credentials, and Credentials Storage
public static int createOAuth2Authorizer()
public static int setJsonCredentials(int authIndex, String jsonCredentials)
public static int setScopes(int authIndex, String[] scopes)
public static int authorize(int authIndex)
public static String getAccessToken(int authIndex)

Setting access token
String accessToken = Authorizer.getAccessToken(mAuthorizer);
mSpreadsheetService.setHeader("Authorization", "Bearer " + accessToken);
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Connecting it together
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Step by Step
We downloaded the JDK, downloaded and installed the libraries and SDKs,
installed Eclipse and the App Engine plugin for eclipse.
2. We registered our app id in our google account, generating the client secret
json.
3. We imported or created two eclipse Java projects:
1.
a)
b)
The OAuth2 project
The google docs project
And exported two runnable jars, selecting the option to copy referenced
libraries to a subdirectory.
5. We created a VS2010 JNI project – with the C++ access to the java APIs,
making sure the .jars created in step 3 are loaded.
6. We created an ARX app, incorporating the JNI apis, and commands to
get/set the spreadsheet data to the AcDbTable entity.
7. We set NEXTFIBERWORLD to 0 in AutoCAD, quit, and noted in the next
session, FIBERWORLD was 0. We then ran the app.
4.
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The Google App Engine
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The App Engine and Data Store

The App Engine is the server part of our application on the Google
platform.

The following link gives a step by step procedure of creating an
account


https://developers.google.com/web-toolkit/doc/latest/tutorial/appengine
This is integrated in Eclipse

File  New  Project – ‘Google’
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High Replication Data Store

For details and an overview.


https://developers.google.com/appengine/docs/java/datastore/
Key concepts for the store are the notion of
Entities – these are the referenceable objects that hold properties
 Properties – these are named properties and entity has
 Kind – this qualifies the type of entity being created
 Key - this is an object that lets you reference an entity.

© 2012 Autodesk
The References problem

Item has ContentId and LocalPath
 Item has a list of references
 Determine: Given a content Id



What are nodes with different local paths with the same content
What are the references
What are the referencers
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Implementation of references

Xref graph api: host dwg is root, xrefs are child nodes
 Use timestamps and special request header information for region, city


Qualify content and references query by Date/Time. I.e. between specific
dates.
Qualify content and references query by region. I.e. city/state/country.
© 2012 Autodesk
Step by Step
1.
2.
3.
4.
5.
6.
7.
Create and setup an Eclipse project for GAE, including installing the
GAE sdk and the GAE plugin.
Implement, using Jersey, REST apis that log a FileItem and its
references in the High Replication Data Store.
Deploy that app to GAE from within eclipse.
Implement a Java client app using Jersey to invoke the REST apis to
put a FileItem, and get references and references to a file item.
Implement a JNI layer to invoke the Java client apis
Integrate the JNI calls into the ARX app that implements the
GAELOGREFS, GAEGETREFS and GAEGETREFSTO commands.
Run the arx app, making sure FIBERWORLD is 0.
© 2012 Autodesk
Metrics and Billing
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Google Client API
•
•
•
•
Free quota
Wide range of services
Some services have billing
Ability to view usage profile
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GAE usage and billing
Billing information at:
https://developers.google.com/appengine/docs/billing
Complex Billing
• Bandwidth
• Instance hours (backend and frontend)
• Database operations (read, write, small)
• Storage
© 2012 Autodesk
Azure

Windows Azure Cloud Services: PaaS
App doesn’t remember state, kept in DataStore services
 Also has web role and worker role instances (frontend/backend)
 Like GAE – create web role, create package, deploy to cloud.
 Integrated in Visual Studio


Azure provides IaaS. Specify VHD and VM size (like AMI in Amazon).

Billing: http://www.windowsazure.com/enus/pricing/calculator/?scenario=full
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Thank You!
© 2012 Autodesk
Autodesk, AutoCAD* [*if/when mentioned in the pertinent material, followed by an alphabetical list of all other trademarks mentioned in the material] are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and/or other countries. All other brand names, product names, or trademarks belong to their respective holders. Autodesk reserves the right to alter product and
services offerings, and specifications and pricing at any time without notice, and is not responsible for typographical or graphical errors that may appear in this document. © 2012 Autodesk, Inc. All rights reserved.
© 2012 Autodesk