Computer system for disparate windowing environments which translates requests and replies between the disparate environments

• US 5,613,090 A
• Filed: 10/05/1993
• Issued: 03/18/1997
• Est. Priority Date: 10/05/1993
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Willems, Richard A.
• Primary Examiner(s): Barry, Lance L.
• Application Number:
  US08/132,141
• Time in Patent Office: 1,260 Days
• Field of Search: 341/50-107, 345/118-120, 345/141-146, 345/153-155, 345/902, 395/155-161, 395/200, 395/300, 395/700, 395/800, 395/200.01, 395/200.03-200.04, 395/200.12, 395/200.18, 395/500, 395/650
• US Class Current: 719/329
• CPC Class Codes: G06F 9/452 Remote windowing, e.g. X-Window System, desktop virtualisation protocols for virtual reality H04L67/131
• CPC Class Codes: G06F 9/546 Message passing systems or structures, e.g. queues

Abstract

A computer system for disparate windowing environments includes a server which leverages as much of one windowing environment'"'"'s code as possible, and uses another windowing environment'"'"'s code only in cases either to remain compliant with the other windowing Environment'"'"'s protocol or where the other windowing environment'"'"'s code is clearly more suited for a given task. The server according to the present invention is made up of two basic components: a front end adapted for the first windowing environment, which is a network-aware application that serves up high-level application programming interfaces (e.g., create window, draw line, draw text) to a complementary component, a translation layer, running as a daemon on a UNIX machine. A custom protocol is used to communicate between the front end and the translation layer, in order to separate out functionality that can be handled ideally on a UNIX platform, such as property lists and atom management and place only the code that is absolutely necessary, such as window manipulation, rendering primitives and input event handling, on the PC. By placing code on a UNIX platform where system resources are typically not constrained, more system memory is made available on the PC. Each of the above attributes dramatically reduce system memory requirements and improve system performance.

Claims

1. A computer system for disparate environments, wherein an application is executing in said first windowing environment, the computer system comprising:

a network, including a plurality of personal computers and means for connecting said plurality of personal computers together in a manner which enables communications there between;

said plurality of personal computers including at least one personal computer of a first type operating in a first windowing environment and one or more personal windowing computers of a second type operating in a second windowing environment;

a translation layer receiving replies and providing requests according to said first windowing environment and providing requests and receiving replies according to an intermediate format and

a front end compatible with said second windowing environment and communicating with said translation layer, said front end receiving replies and providing requests according to said intermediate format and receiving requests and providing replies according to said second windowing environment,

wherein said translation layer comprises;

first protocol interface means for interfacing said first windowing environment in accordance with a first protocol;

first means for converting a plurality of requests from said application in said first windowing environment into a corresponding plurality of requests of said intermediate format;

second means for converting a plurality of replies in said intermediate format from said front end into a corresponding plurality of replies for said first windowing environment;

third means for converting a plurality of event codes in said intermediate format from said front end into a corresponding plurality of event codes for said first windowing environment;

fourth means for converting a plurality of error codes in said intermediate format generated by said front end into a corresponding plurality of error codes for said first windowing environment; and

second protocol interface means for interfacing to said front end in accordance with an intermediate protocol.

2. The computer system according to claim 1, wherein said translation layer comprises means for emulating an X server.

3. The computer system according to claim 1, wherein said translation layer executes as a daemon on said at least one personal computer of said first type.

4. The computer system according to claim 1, wherein said translation layer comprises a plurality of mapping routines.

5. A computer system for disparate environments, comprising:

a network including a plurality of personal computers and means for connecting said plurality of personal computers together in a manner which enables communications there between;

said plurality of personal computers including at least one personal computer of a first type operating in a first windowing environment and one or more personal windowing computers of a second type operating in a second windowing environment;

a translation layer receiving replies and providing requests according to said first windowing environment and providing requests and receiving replies according to an intermediate format and

a front end compatible with said second windowing environment and communicating with said translation layer, said front end receiving replies and providing requests according to said intermediate format and receiving requests and providing replies according to said second windowing environment, wherein said front end comprises;

network interface means for interfacing between said translation layer and said second window environment;

means for parsing and dispatching;

first report means for reporting events developed by said second windowing environment; and

second report means for reporting errors in requests from said translation layer.

6. The computer system according to claim 5, wherein said network interface means comprises:

sequencing means for receiving a network packet and breaking said network packet into a sequence of tasks and performing said sequence in an optimized manner.

7. The computer system according to claim 6, wherein said sequencing means comprises a finite state machine.

8. A server, comprising:

a network, including a plurality of personal computers and means for connecting said plurality of personal computers together in a manner which enables communications there between;

said plurality of personal computers including at least one personal computer of a first type operating in a UNIX windows environment and one or more personal computers of a second type operating in a DOS windows environment;

an application executing in said UNIX windows environment;

a translation layer receiving replies and providing requests according to said first windowing environment and providing requests and receiving replies according to an intermediate format, including;

first protocol interface means for interfacing to said UNIX windows environment in accordance with an X11R4 protocol;

first means for converting a plurality of requests from said application in said UNIX windows environment into a corresponding plurality of requests in said intermediate format;

second means for converting a plurality of replies in said intermediate format from said front end into a corresponding plurality of replies for said UNIX windows environment;

third means for converting a plurality of event codes in said intermediate format from said front end into a corresponding plurality of event codes for said UNIX windows environment;

fourth means for converting a plurality of error codes in said intermediate format generated by said front end into a corresponding plurality of error codes for said UNIX windows environment; and

second protocol interface means for interfacing to said front end in accordance with an intermediate protocol; and

a front end compatible with said DOS windows environment and communicating with said translation layer, said front end receiving replies and providing requests according to said intermediate format and receiving and providing replies according to said second windowing environment, said front end including;

network interface means for interfacing between said translation layer and said second windowing environment, said network interface means including;

sequencing means, including a finite state machine, for receiving a network packet and breaking said network packet into a sequence of tasks and performing said sequence in an optimized manner;

means for parsing and dispatching;

first report means for reporting events developed by said DOS windows environment; and

second report means for reporting errors in requests from said translation layer.

9. The computer system according to claim 8, wherein said translation layer comprises means for emulating an X server.

10. The computer system according to claim 8, wherein said translation layer comprises executes as a daemon on said at least one personal computer of said first type.

11. The computer system according to claim 8, wherein said translation layer comprises a plurality of mapping routines.