Java程序辅导

CRC Collaborative Designer
Notes by Greg Smith
Key Centre of Design Computing and Cognition
University of Sydney
CRC Collaborative Designer – p.1/15
Objective
CRC project aims
Investigate distributed designer collaboration &
facilitating technologies
Investigate allowing different disciplines to share design
models
CRC Collaborative Designer aims
Allow remote designers to collaborate
Conceptual design environment
Integrate with virtual environment
CRC Collaborative Designer – p.2/15
Requirements of initial prototype
Designers
Collaborate remotely across network
Visualise design in AW browser 3D panel
Interact with system via AW browser HTML panel
Index page
System overview
Help
Health of database and agent
Webcam
Audio and vision
CRC Collaborative Designer – p.3/15
Requirements of initial prototype
Whiteboard
Distributed
Save/load sketches to/from database
Logging
Capture image to background
Designer’s palette
Distributed collaboration
Palette of 3D objects
Changes with category of designer
Configure & select objects parametrically
3D model viewer
Save/load objects & collaboration status to/from
database
CRC Collaborative Designer – p.3/15
Demo
CRC Collaborative Designer – p.4/15
System architecture
1.. ∗
1.. ∗
Apache Tomcat JSP engine on Linux or PC
MySQL database on
Linux or PC
Designer’s PC
Sensor AW3DObjectSensor
AWAvatarSensor
Perceptor
Agent
CcdAgent SpatialAgent StructuralAgent
CcdActivator
SpatialActivator
StructuralAtcivator
ActionActivator
AW3DObjectEffector
Effector
NullConceptor
BioBean
ProjectBean
ObjectCatalog
AgentBean
pallete.jsp
whiteboard.jsp
3D
Panel
HTML
Panel
AgentServer
AW Server
Agent(s) on PC
webcam.jsp
index.jsp
CRC Collaborative Designer – p.5/15
Designers PC
1.. ∗
1.. ∗
Apache Tomcat JSP engine on Linux or PC
MySQL database on
Linux or PC
Designer’s PC
Sensor AW3DObjectSensor
AWAvatarSensor
Perceptor
Agent
CcdAgent SpatialAgent StructuralAgent
CcdActivator
SpatialActivator
StructuralAtcivator
ActionActivator
AW3DObjectEffector
Effector
NullConceptor
BioBean
ProjectBean
ObjectCatalog
AgentBean
pallete.jsp
whiteboard.jsp
3D
Panel
HTML
Panel
AgentServer
AW Server
Agent(s) on PC
webcam.jsp
index.jsp
CRC Collaborative Designer – p.6/15
JSP engine
1.. ∗
1.. ∗
Apache Tomcat JSP engine on Linux or PC
MySQL database on
Linux or PC
Designer’s PC
Sensor AW3DObjectSensor
AWAvatarSensor
Perceptor
Agent
CcdAgent SpatialAgent StructuralAgent
CcdActivator
SpatialActivator
StructuralAtcivator
ActionActivator
AW3DObjectEffector
Effector
NullConceptor
BioBean
ProjectBean
ObjectCatalog
AgentBean
pallete.jsp
whiteboard.jsp
3D
Panel
HTML
Panel
AgentServer
AW Server
Agent(s) on PC
webcam.jsp
index.jsp
CRC Collaborative Designer – p.7/15
MySQL database
1.. ∗
1.. ∗
Apache Tomcat JSP engine on Linux or PC
MySQL database on
Linux or PC
Designer’s PC
Sensor AW3DObjectSensor
AWAvatarSensor
Perceptor
Agent
CcdAgent SpatialAgent StructuralAgent
CcdActivator
SpatialActivator
StructuralAtcivator
ActionActivator
AW3DObjectEffector
Effector
NullConceptor
BioBean
ProjectBean
ObjectCatalog
AgentBean
pallete.jsp
whiteboard.jsp
3D
Panel
HTML
Panel
AgentServer
AW Server
Agent(s) on PC
webcam.jsp
index.jsp
CRC Collaborative Designer – p.8/15
Agent Ccd
Java program, uses AW SDK via JNI to DLL
Senses
Changes to 3D objects in world
Changes to avatars in world
Chat in world
Remembers what 3D objects are nearby
Remembers what avatars are nearby
Listens for messages from JSP pages
Requests are to change world
Satisfies each request & returns response
CRC Collaborative Designer – p.9/15
pallete.jsp
Designer sees HTML rendered in AW browser RHS panel
And clicks on a radio button
...





Enable architects objects



...
CRC Collaborative Designer – p.10/15
pallete.jsp
But there is no such HTML file on the server!
Instead it has the following
...
<% String ar_ch = (pb.getCategory().equals("ARCHITECT") ? "CHECKED" : "");
%>
’
method="POST">



 type="radio"
name="category"
value="<%= kcdcc.awa.proxy.AgentBean.ENABLE_ARCHITECT %>"
onChange="document.of.submit()">
Enable architects objects



...
CRC Collaborative Designer – p.11/15
pallete.jsp
The above is part of a Java Server Pages (JSP) file
Is normal HTML, CSS, JS, images, ...
But also with Java code inserted
Uses HTTP protocol
Server “executes” JSP file
HTML in pallete.jsp is left as is
Executes <% /* java here */ %> code
Executes <%= /* java here */ %> and inserts resulting value
Sends resulting HTML to client browser
When you click on radio button
Form is submitted back to same JSP file
CRC Collaborative Designer – p.12/15
pallete.jsp

’/>
’/>
<%
String pc = request.getParameter(’category’);
if (pc == null)
rmiagtst.setCategory(kcdcc.awa.proxy.AgentBean.ENABLE_ALL);
else
rmiagtst.setCategory(Integer.parseInt(pc));
%>


 same JSP constructs different HTML according to
situation
CRC Collaborative Designer – p.13/15
Database
Because pallete.jsp is on server
It can use a database when constructing HTML
<% kcdcc.crc.beans.ProjectBean pb =
new kcdcc.crc.beans.ProjectBean("Prototyping"); %>
kcdcc.crc.beans.ProjectBean is a Java class
Hides database details from JSP engine
Hides HTTP & JSP details from database
Has methods like
public String getCategory()
{ /* do SQL query to retrieve category */ }
public void setCategory(String cat)
{ /* do SQL update with cat */ }
CRC Collaborative Designer – p.14/15
Summary
Agent is a remote Java process
Listens to JSP engine for requests
Talks to AW server to satisfy requests
Database maintains state fo distributed system
JSP engine
Serves HTTP requests from AW browser clients (RHS
panel)
Interprets request messages
Updates database & agent accordingly
Returns new HTML in HTTP responses
CRC Collaborative Designer – p.15/15
Summary
AW browser: designer (citizen) ...
Interacts with 3D world
Chats to citizens &/or agent
Interacts via whiteboard
Interacts via webcam visual & audio
CRC Collaborative Designer – p.15/15