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Collaborative Interactive Data Language (IDL)

Collaborative Interactive Data Language (IDL). Minjun Wang EECS Department, Syracuse University, USA mwang03@syr.edu Adviser Dr. Geoffrey C. Fox gcf@indiana.edu. Architecture (1). The collaborative IDL application consists of two types of clients – Master and participant.

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Collaborative Interactive Data Language (IDL)

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  1. Collaborative Interactive Data Language (IDL) Minjun Wang EECS Department, Syracuse University, USA mwang03@syr.edu Adviser Dr. Geoffrey C. Fox gcf@indiana.edu

  2. Architecture (1) • The collaborative IDL application consists of two types of clients – Master and participant. • It makes use of a Message Broker – NaradaBrokering as the underlying message communication service for the Master and Participant clients.

  3. Architecture (2) • The master client displays a GUI containing a lot of button widgets which represent JPEG images. • When a user clicks a button, • the corresponding image displays in IDL; • the master client captures the event and send it to NaradaBrokering to broadcast to participating clients for rendering.

  4. Architecture (3) • The participant receives event messages broadcasted from NaradaBrokering, and renders the display as that of the Master. There can be multiple instances of participant clients

  5. A Shared Event Model for Collaboration • We Use a shared event model for the IDL collaboration • It is Message-based event communication between Master and Participants instead of transferring bitmaps through the Internet. • It lowers the network traffic greatly • It improves performance and efficiency

  6. Implementation (1) • The Master client is an IDL program. It consists of a GUI building and managing procedure, and an event handling procedure. • It captures the event message in the event handler when a user click a button in the GUI. • It makes use of the IDL-Java bridge, call methods in a Java program to connect to NaradaBrokering, and send out the event messages to it for broadcasting.

  7. Implementation (2) • The participant is a Java program. • It connect to NaradaBrokering and receive event messages from it. • The Java program controls the rendering process according to the event messages it received. • It makes use of the Callable IDL technology and JNI technology. • It calls the IDL functions for the rendering. • In order to do that, it has to call the IDL functions through a C program, in other words, that C program calls IDL functions directly through Callable IDL technology. • A shared library (libCallableIDL.so) is generated from the C program, and the Java program calls the native functions in the shared library through JNI. • This way, it renders the images simultaneously with the master client.

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