Demonstration Programs

Demonstration Programs

Demonstration programs provide examples of how to use the ObjectStore Java Interface. Select the README file to learn what the program does and how to run it. Select the directory to display a list of the source files, which you can examine outside the browser. The best demonstration to start with is the simple applet hit counter. After that, try the basic example of using the ObjectStore Java Interface. Brief descriptions of all demos are after the following table.

README File	Directory That Contains the Demo
Simple applet hit counter	install_dir/com/odi/demo/pcount
Basic example of using the ObjectStore Java Interface	install_dir/com/odi/demo/people
Using (com.odi.util) classes in a trading model for portfolios of securities	install_dir/com/odi/demo/pport
Java/C++ programs that create and access objects	install_dir/com/odi/demo/jcpp
Product bill of materials with GUI for queries	install_dir/com/odi/demo/products
Querying ObjectStore utility (com.odi.util) collections	install_dir/com/odi/demo/query
Using multiple cooperating threads	install_dir/com/odi/demo/threads
Using multiple segments in multiple databases, exporting objects	install_dir/com/odi/demo/tracker
Controlling persistent representation of objects	install_dir/com/odi/demo/rep
Basic Java Dynamic Data API example.	install_dir/com/odi/demo/jdd1
Using the Java Dynamic Data API to manage multiple views of data.	install_dir/com/odi/demo/jdd2

Here are descriptions of the demo programs:

• Simple applet hit counter shows how to write a simple applet that uses ObjectStore. You can use this applet as a hit counter, such as those you see on Web pages that indicate the number of times that page has been visited. (install_dir/com/odi/demo/pcount)

• Basic example of using ObjectStore stores some information about a few people and then retrieves the information and displays it. Additional information about this demo is in Chapter 2 of the user guide. (install_dir/com/odi/demo/people)

• Using (com.odi.util) classes in a trading model for portfolios of securities computes the "net asset value" of a portfolio as a function of time, This demo uses a dictionary collection provided by the (com.odi.util) facility. (install_dir/com/odi/demo/pport)

• Java/C++ programs that create and access objects is an example of how to use C++ classes in an ObjectStore Java program. (install_dir/com/odi/demo/jcpp)

• Product bill of materials with GUI for queries loads a products demo database with bicycle parts, and provides a graphical user interface to query the database. (install_dir/com/odi/demo/products)

• Querying ObjectStore utility (com.odi.util) collections provides two programs for querying a database that stores information about customers. Each program uses the collection and query features in com.odi.util. One version uses a B-tree-based Map to look up customers by telephone number. The other version supports ad hoc queries (queries supplied by users at run time) with indexes. (install_dir/com/odi/demo/query)

• Using multiple cooperating threads illustrates the use of ObjectStore in multi-threaded applications where the threads cooperate, which means they belong to the same session. (install_dir/com/odi/demo/threads)

• Using multiple segments in multiple databases, and exporting objects provides an example of features specific to the Java interface to ObjectStore, and not included in ObjectStore PSE or PSE Pro for Java. These features include using multiple databases, allocating in multiple segments, exporting objects, and recovering from deadlock. (install_dir/com/odi/demo/tracker)

• Controlling persistent representation of objects shows that you do not need to store all instance variables; you can choose your own representation. (install_dir/com/odi/demo/rep)

• Using the Java Dynamic Data API. This program is a basic example of the use of the Java Dynamic Data (JDD) API in ObjectStore to store and manage data. (install_dir/com/odi/demo/jdd1)

• Using the Java Dynamic Data API. This program is an example of the use of JDD to manage multiple views of the same data independently of each other. (install_dir/com/odi/demo/jdd2)