| The thesis is based on the research and development of the 226 project, which isAir Traffic Control system for military. Firstly, the construction and function aboutthe 226 project are introduced in the thesis, in which, the status and significance ofMonitor and Control Agent (MCA) are mentioned. Then, the thesis investigated thedesign and implementation of Workstation Monitor and Control Agent (WMCA)subsystem, one of the main components of MCA, in detail, in which, with theknowledge of software engineering, research on the model and procedure ofsoftware development, and studies carried out on several key technologies in theWMCA, some algorithms and methods are being adopted and considered aseffective and robust in practice. The main researches are presented as follows:(1 implementation of Algorithm to acquire system information from VirtualFile System: With the knowledge of Virtual file system (VFS) provided by UNIX, itis possible to acquire process information in certain time and to compare the processinformation acquired this time with those obtained last time in order to keep theprocess ID and the number of the processes consistent. With these consistent data,we get the results based on analyzing and computing, including CPU use rate,memory free rate and correlative process information, etc. The algorithm makes fulluse of VFS (Virtual File System) of UNIX and the dynamic characteristic of processso that it is transparent and robust and the testing results have only negligible error.(2)The method based SNMP to acquire system information: The 3com switchsupports SNMP protocol and contains standard MIBII, which is used by SNMP togather information about the devices of a network. Interface group is the componentof MIBII, which provides port state and flow of switch. After acquiring theinformation of port, we can get the availability of the port through comput;,ig. WhileSCO UNIX also supports SNMP and has its own MIB. That is, HOST group, whichrecords host resources system information. The thesis describes those objects thatare concerned with host memory in HOST group. In a word, it is simple and feasibleto request their values with SNMP.(3)The research and implementation of SNMP cross ph tforms: In different OS,the implementations of SNMP are different and the programming interfaces own thediversity. The paper introduces an Object-Oriented method to avoid the disadvantageabove, which can be used on different OS, that is, it is cross-platforms. SNMPcoding and decoding is based on BER (Basic Encoding Rules).So with theintroduction of BER, the paper illuminates the implementation of SNMP crossplatforms in detail. Practically speaking, the method given by the paper resolves thediversity existed in different system platform and the message collection isconvenient, rapid and accurate, which is of value and usability. (4)The design ofworkstation mode switchover: Workstation mode stands for a group of processesthat are read from a configuration file when workstation mode needs to be startedand controlled together. And WMCA switchover means a group of processes areterminated and another group of ones are started. According to requirement analysis,it should be thought over that some modes are limited so that they can be run ononly one host synchronously and two certain modes can be permit runningtogether on a device. Through investigating and studying, the paper brings forwardsolutions respectively, which are proved feasible. The knowledge and technology relative to SNMP are the main issue in thethesis. The paper states concepts of SNMP in different perspective. Firstly, itsfundamental is introduced and some examples are given to help to explain its usage.Secondly, the paper expatiate the implementation of SNMP cross platform used inWMCA. Lastly, the paper advances some ideas about the improvement of WMCAbasedSNMP. The thesis is dissertated around five parts. The first part, it gives thebackground, sign...
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