Transcript Document
Basics of OSGi and Phidgets
May 24, 2007
Department of Computer Science
Guillermo Hernandez, Jose Reyes Alamo
Understanding the basics of
OSGi and Phidgets Programming
Smart Home Lab Iowa State University
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
Phidgets
• Definition - User-friendly system available
for controlling and sensing the environment
from your computer. No hardware knowledge
needed, just a matter of plugging into the
USB port on your computer and use Phidgets
software libraries to access these devices.
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
Phidgets Hardware Installation
1. Connect one end of a USB cable to the
phidget and the other end to the computer.
2. (Optional) If the phidget requires power
make sure to plug it to a power source.
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
Phidgets Software Intallation
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Go to www.phidget.com and click on downloads.
Click on the link for Phidget21 Downloads
Download the file PHIDGET.MSI
Install the PHIDGET.MSI. This file allows your
OS to easily interact with the Phidgets.
5. Download Java JNI Library - Phidget21 to a
known location. This is a .jar file that will be used
later for application development.
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
Using Phidgets – RFID Project
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Open Eclipse and go to File NewProject and select Java
Project
Click Next and give an appropriate name to the project and click
Finish.
RIGHT click under you project name and click on Properties
On the menu to the left, click on Java Build Path
On the Tab Menu click on Libraries
Click on Add External JARs.
Locate the file called phidget21.jar (just downloaded)
Create a new Class
Import the following packages: com.phidget.* and
com.phidget.event.*
Department of Computer Science
Guillermo Hernández, José M. Reyes Álamo
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import com.phidgets.*;
import com.phidgets.event.*;
public class RFIDExample{
public static final void main(String args[]) throws Exception {
RFIDPhidget rfid;
rfid = new RFIDPhidget();
rfid.addTagGainListener(new TagGainListener(){
public void tagGained(TagGainEvent oe){
System.out.println(oe);
}
});
rfid.openAny();
rfid.waitForAttachment();
System.out.println("Serial: " + rfid.getSerialNumber());
System.out.println("Outputs: " + rfid.getOutputCount());
rfid.setAntennaOn(true);
rfid.setLEDOn(true);
System.in.read();
rfid.close();
rfid = null;
}
}
Basics of OSGi and Phidgets
May 24, 2007
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
OSGi
• What is OSGi?
– OSGi stands for Open Services Gateway Initiative.
– It is an open standards organization composed of companies
like Sun Microsystems, IBM, Motorola among many others.
– Provides a Java based service platform that can be remotely
managed.
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
OSGi
• Key terms in OSGi
– Bundle- a java JAR file that contains service definition and
implementation.
– Service- a function provided by a bundle. (e.g. reading the
temperature of a temperature sensor).
– Framework- the central component of OSGi. It is the
execution environment for services and bundles.
Basics of OSGi and Phidgets
May 24, 2007
Department of Computer Science
Guillermo Hernández, José M. Reyes Álamo
OSGi
Figure 1- OSGi Framework
Basics of OSGi and Phidgets
May 24, 2007
Department of Computer Science
Guillermo Hernández, José M. Reyes Álamo
OSGi
Smart Home Application
Application Layer
Use services published by bundles
Service Layer
Use service published
by other bundles
Service
Service
Service
Services published by bundles
Knoplerfish OSGI Framework
Bundles deployed to framework
Bundle
Bundle
Bundle
Bundle
Actuator
Actuator
Atlas
Node
Physical Layer
. . . . .
Sensor
Sensor
Figure 2- Service Oriented Framework
Department of Computer Science
Basics of OSGi and Phidgets
May 24, 2007
Guillermo Hernández, José M. Reyes Álamo
OSGi
Code Demonstration
•How to create a bundle
•How to create and publish a service
•How to use a service
Department of Computer Science
Guillermo Hernández, José M. Reyes Álamo
Questions
Basics of OSGi and Phidgets
May 24, 2007