UBSS overview, ATC Middleware

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Information about UBSS overview, ATC Middleware

Published on December 31, 2007

Author: elfuchs

Source: slideshare.net

UBSS UNIX Based System Software MCC/CPC/CIS

Overview  UBSS Is The Middleware For THOMSON-CSF AIRSYS Centers :  ATM : Air Traffic Management Systems.  ACCS : Air Command And Control Systems.  And Others Control Command (C²) Applications.  UBSS is used all over the world by AIRSYS provided ATC or ACS systems :  about 500 nodes on 25 operational sites  about 1000 nodes on 60 sites (delivered system and contracts in progress)  UBSS Is Based On UNIX Mechanisms, It Provides High Level Services For Unix Based Real Time Distributed Fault Tolerant Systems.  Services Are Available Through API Provided For C And Ada Language. 01/04/2004  UBSS Provides A Framework For Application Design. Version 6 UBSS Product 2 Multidomain Control Center

UBSS Genesis Beginning of UBSS design : 1990 Two main objectives :  To Answer to ATM real time constraints on UNIX platforms  To Allow distributed architectures Reuse of existing technologies or models :  Asynchronous tasking model from THOMSON  Data replication technology from SIGNAAL 01/04/2004 Version 6 UBSS Product 3 Multidomain Control Center

UBSS Concepts TRANSPARENCY. Independence Between Logical And Physical Architecture. ENCAPSULATION. Ada And C Interface, Socket Based Layered Architecture. SOFTWARE COTS* PRODUCT (V3.3). Industrial And Quality Rules. 01/04/2004 * COTS : Commercial Of the Shelf Version 6 UBSS Product 4 Multidomain Control Center

UBSS Concepts : Transparency (OSI RM/ODP*, ANSA*) * ANSA : Advanced Networked System Architecture OSI RM ODP : OSI Reference Model of Open Distributed Processing (ISO 10746-1, X901).  Access Transparency : Local And Remote Applications Are Addressed By Identical Operations.  Location Transparency : Applications Are Addressed Without Knowledge Of Their Location.  Replication Transparency : Enables Multiple Instances Of Applications, Without Knowledge Of Their Surroundings.  Failure Transparency : Allows Automatic Recovery Of System Failures, Without Lasting Effects To The Applications Users.  Migration Transparency : Allows The Movement Of Applications Without Affecting The Operation Of Users Or Other Applications.  Scaling Transparency : Allows The System And Application Software To Expand In Scale Without Changing The Application Programs. 01/04/2004 Version 6 UBSS Product 5 Multidomain Control Center

UBSS Concepts : Transparency  Transparency Implementation. Asynchronous Real Time. A Task = A Unix Process. Asynchronous Communication. Fault Tolerant Services. 01/04/2004 Version 6 UBSS Product 6 Multidomain Control Center

UBSS Concepts : Transparency LAN P1 P2 P1 ∆ t1 ∆ t3 Name Server P3 P2 ∆ t2 Centralised Architecture P3 01/04/2004 Distributed Architecture Version 6 UBSS Product 7 Multidomain Control Center

Synchronous Real Time VS Asynchronous Real Time Synchronous = Periodic=> No ∆T Events T1 T2 T3 T4 T5 e1 e2 e3 e4 e5 e6 Time ∆Τ T1 T2 T3 T4 T5 e1 e2 e3 e4 e5 e6 Time Assynchronous = Aperiodique => ∆Τ 01/04/2004 Version 6 UBSS Product 8 Multidomain Control Center

Synchronous Communications VS Asynchronous Communications No Transmission Delays Constant Transmission Delays Randomly Variable Transmission Delays Events Events Events Events e1 e1 e1 Events e1 Events e1 e1 T1 T1 T1 T1 T1 T1 e2 e2 e2 e2 e2 T2 T2 T2 T2 e2 T2 e3 e3 e3 e3 e3 T2 T3 T3 T3 T3 T3 e4 e4 e4 e3 e4 e4 T3 e4 01/04/2004 Version 6 UBSS Product 9 Multidomain Control Center

UBSS Concepts : Transparent Applications plugging Non UBSS Third party Third party Application Application Application UBSS Application UBSS Application (Ada or C or C++) (Ada or C or C++) UBSS Adaptor UBSS Backbone Operating System and telecomunications 01/04/2004 Version 6 UBSS Product 10 Multidomain Control Center

UBSS Concepts : Encapsulation Provides Typesafe Encapsulation Of Lower-Level UNIX Programming Interfaces. Shields Developers From Low Level Programming Details. High Level Abstractions Provided By Value-Added Encapsulation Facilitate The Construction Of Distributed System. Improves Software Reusability And Portability. UBSS Is Based On UNIX Mechanisms, It Provides High Level Services For Unix And Sockets Based Real Time Distributed Fault Tolerant Systems. Services Are Available Through API Provided For C And Ada Language. 01/04/2004 Version 6 UBSS Product 11 Multidomain Control Center

Middleware Benefit : Software product life cycle Transparency System Life cycle = 10 years Application Application Middleware Middleware Operating System Operating System Technologie Life cycle = 3 years 01/04/2004 Version 6 UBSS Product 12 Multidomain Control Center

Software lay out ADA & C & C++ Applications Standard UBSS Interface FROZEN INTERFACE UBSS MIDDLEWARE Operating System (UNIX) Hardware Platform Communication medium & protocol 01/04/2004 Version 6 UBSS Product 13 Multidomain Control Center

UBSS Concepts : Encapsulation Application (Ada or C or C++) API Ada or C UBSS Middleware Socket DEC Digital_Unix HP UX Solaris - AIX Ultrix - ... 01/04/2004 Version 6 UBSS Product 14 Multidomain Control Center

UBSS Concepts : Software COTS Product Software Team : To Regroup System Software Skills In One Dedicated Team (MCC/CIS :Infrastructure System). UBSS Product Code Size : 300 Kloc Of C, 30 Kloc Of Ada. UBSS Product Documentation Size : 3000 Pages + 1000 Man Pages (On-Line Documentation, CD ROM, WEB). Methodology : DOD 2167A : SRS, SDD, STP, STD, STR, VDD, SUM, Man Pages. Quality process : ISO9000, CMM* 01/04/2004 * CMM : Capability Maturity Model For Software Version 6 UBSS Product 15 Multidomain Control Center

UBSS Concepts : Software Product Support And Maintenance :  Hot Line : Phone, Email, WEB.  2 Major Releases A Year, Fully Tested (STP,STD, STR) And Documented (VDD ). Training Sessions :  2 Levels (Theoretical An Practical) : Programmers, Integrators.  About 20 Training Sessions Already Performed. Tools : Debugging, Performance, Training. 01/04/2004 Version 6 UBSS Product 16 Multidomain Control Center

UBSS :Technical Middleware Application Operational Middleware (Framework) Middleware Technical Middleware 01/04/2004 Version 6 UBSS Product 17 Multidomain Control Center

UBSS : Software Architecture Tool Box Peer To Peer.  Synchronous Or Asynchronous Inter Process Communication (IPC).  System Wide Shared Data Distribution. Client/Server.  Data : Push/Pull.  Processing : Synchronous/Asynchronous.  Distributed Server : Duplicated Concurrent Or Cooperant.  Dynamic Server Allocation And Reconfiguration. Event Services.  Subscription To Asynchronous Notification.  Stateless Or Statefull Processing.  Multiplexing And Priority. 01/04/2004 Version 6 UBSS Product 18 Multidomain Control Center

UBBS : Application Software Architecture Loop Event Processing Sequential Event Processing begin loop forever wait event1 wait event send message1 case event event1 send message1 wait event2 send message2 event2 send message2 event3 wait event3 send message3 send message3 end case end end loop 01/04/2004 Asynchronous Synchronous Version 6 UBSS Product 19 Multidomain Control Center

UBSS Components Inter-Process Communication (IPC) • Mailbox (MLBX) Communication • FIFO Multi Purpose Telecommunication Management (MTM) Consistent Data Store Copies (CDC) Node And Process Management (NPM) Supervision • Dual Node Control (DNC) System Control And Monitoring (SCM) Time And Clock Management (TCM) • External Time Injection (ETI) Time/clock management • Clock Synchronization (CS) • Time Management (TM) • High Resolution Timers (HRT) Input Output Calls (IOC) Miscellaneous Basic System Name Server (BNS) 01/04/2004 Dynamic Trace Unit (DTU) Version 6 UBSS Product 20 Multidomain Control Center

UBSS New Components : PATIO* project Outputs : DSS : Distributed Sequencing Services DST : Distributed Simulated Time (TMH) 01/04/2004 * PATIO : Platform for ATM Tools Integration to Pre-operation Version 6 UBSS Product 21 Multidomain Control Center

Possible interfaces Application Message Library Message Interface Interface Interface 3 3 2 Operator UBBS Interface Process 1 4 4 File interface File interface 01/04/2004 Version 6 UBSS Product 22 Multidomain Control Center

UBSS Components : Architecture Of A Node 1 : interfacing with library functions 2 : operator interface 3 : FP interface Application Application processes 1 1 DTU 1 1 1 1 1 1 NPM SCM TCM CDC MTM 3 IOC DNC BNS IPC Front Processor 2 2 (LINES_FP) Tape Disk 2 Operator WAN Printer 01/04/2004 LAN Version 6 UBSS Product 23 Multidomain Control Center

Consistent Data Store Copies (CDC) : Scope Asynchronous Data Distribution = System Wide Distributed Shared Memory. Typed Shared Memory. Data Store = Array Of Records Duplicated On Each Node. CDC Keeps Duplicated Record Coherency. Provides Data Persistence And Independence Between Read And Write Operations. After Subscription, User Is Notified Of Each Update. With CDC a server instance is present on each client Node : Proxy 01/04/2004 Version 6 UBSS Product 24 Multidomain Control Center

UBSS CDC : Context Diagram Master Slave Slave Appli Appli Appli Data Store Data Store Data Store data bus LAN Slave Slave Data Store Data Store Appli Appli Appli 01/04/2004 Version 6 UBSS Product 25 Multidomain Control Center

UBSS CDC : ATC Operational Data Distribution Tracks Flight plans Appli Appli FPL TRK FPL TRK FPL FPL TRK TRK 1 to 100 Appli Appli Appli CWPs 01/04/2004 Version 6 UBSS Product 26 Multidomain Control Center

UBSS CDC : System Design Radar RFP RDP FDP Radar1 Radar2 Radar3 Radar4 System Tracks Identification Flight Plan MMI MMI MMI MMI 01/04/2004 Version 6 UBSS Product 27 Multidomain Control Center

UBSS CDC Principle : Data Store (RUC : Record Update Counter) (RUO: Record Update Originator) data store copy RUC RUO User record 12000 records max. { 32 Ko max. CAM 01/04/2004 (CAM : Central Announcement Message) Version 6 UBSS Product 28 Multidomain Control Center

UBSS CDC Protocol : Periodic CAM A B C D E A B C D E T Update CAM T T Update CAM Update T CAM CAM T CAM Master 01/04/2004 (CAM : Central Announcement Message) Version 6 UBSS Product 29 Multidomain Control Center

Basic Name Server ( BNS) : Scope System Wide Logical Name Services. BNS Maintains An Indirection Table Included In CDC : ‘’ALIAS’.’ A BNS Entry Is An Object Name With Physical Or Logical Attributes. CDC Based : Available On Each Node. System Wide Notification When Links Or Attributes Are Updated. Usage Example : BNS Keeps System Components States. BNS Keeps System Topology. 01/04/2004 Version 6 UBSS Product 30 Multidomain Control Center

UBSS BNS : model Logique Name Logical or Physical Attributes Updates Notification FIFO FPL 200.111.23.7 :: 109 :: TCP PRINTER /DEV/TTY1 ERROR /etc/log220895 BNS CDC Indirection Table 01/04/2004 /etc/log230895 ERROR Version 6 UBSS Product 31 Multidomain Control Center

UBSS BNS : Indirection Level ALIAS SYMBOL ITEM 01/04/2004 Version 6 UBSS Product 32 Multidomain Control Center

UBSS BNS principle : Change Notification Item Change Alias Change Alias SYMBOL ITEM Attributs Change Notification } Change notification Alias Change Notification to FIFO 01/04/2004 Version 6 UBSS Product 33 Multidomain Control Center

Inter Process Communication (IPC) : Scope  Typed Asynchronous Communication Services.  Point To Point FIFO.  Secured FIFO.  Diffusion FIFO.  IPC Uses BNS Services For :  Remote Attributes Information.  Server Dynamic Reconfiguration. Multiple Or Single Event Asynchronous Waiting Point With Priorities. Communications Supervision. 01/04/2004 Version 6 UBSS Product 34 Multidomain Control Center

UBSS IPC : Concepts FIFO P2 P1 FIFO P2 P2 P3 FIF O BNS BNS P1 01/04/2004 Version 6 UBSS Product 35 Multidomain Control Center

UBSS IPC Concepts : FIFO paradigm Intra node communications FIFO P2 P1 Inter nodes communications P1 P2 01/04/2004 Node A Node B Version 6 UBSS Product 36 Multidomain Control Center

UBSS IPC Concepts : Wait Multiplexing FPL Priority Mask Appli FPL TRK TRK Appli Appli Wait From Strip Strip Appli FIFO Deck 01/04/2004 Version 6 UBSS Product 37 Multidomain Control Center

UBSS IPC : ATC Operator Orders Centralisation Tracks Flight plans FPL Appli Appli TRK FPL FPL FPL 1 to 100 CWPs Appli Appli Appli 01/04/2004 Version 6 UBSS Product 38 Multidomain Control Center

IPC/FIFO : Concepts Process Environment Timer Unix Process Appli Unix Signal Appli Appli socket Appli 01/04/2004 Version 6 UBSS Product 39 Multidomain Control Center

UBSS IPC services : Server Dynamic Reconfiguration @2 FIFO FPL @2 FIFO FPL @2 P2 FIFO BNS BNS P2 P1 Connection @1 @3 P3 FPL Before Crash @3 FIFO FPL @3 FIFO FPL @2 P2 FIFO BNS BNS P2 P1 Connection @1 @3 P3 FPL 01/04/2004 After Crash Version 6 UBSS Product 40 Multidomain Control Center

Node And Process Management (NPM) : Scope  Manages All Objects On A Node :  Processes, Shared Memory Segments, Semaphores.  Starts/Stops Processes Running On A Node.  Organizes Applications In Group Of Processes.  Identifies Process And Process Group Through Logical Name.  Detects And Reports Node, Process And Process Group States Changes.  Node, Process And Process Group Control And Recovery.  Executes Node, Process Group And Process Commands From Operator  Defines Application Environment.  Process Loop Detection.  User Script Shell Execution.  Dual Node Switching. 01/04/2004  Duplicated LAN Switching. Version 6 UBSS Product 41 Multidomain Control Center

System Control And Monitoring (SCM) : Scope System Wide Supervision Control And Monitoring. Enables Technical Operator To Monitor And Control The Status Of The Technical Part Of The System From Any System Node. System Wide Data Distribution CDC Based,  Gathers All System Objects States In Data Store Duplicated On Each System Node. Automatic System Configuration And Reconfiguration. Generic State Machines. CPU Load Monitoring. Handles Requests Issued By Users Or Applications Users. 01/04/2004 SNMP (Simple Network Management Protocol) MIB (Management Information Base) Version 6 UBSS Product 42 Multidomain Control Center

UBSS : SCM Context Diagram Slave Master Slave CSCM LSCM LSCM SNMP SCM SCM SCM data bus LAN Slave Slave SCM SCM APPLI NPM LSCM LSCM 01/04/2004 Version 6 UBSS Product 43 Multidomain Control Center

Time and Clock Management (TCM) : Scope  Time And Clock Management Provides The Following Services:  Clock Management Services:  External Time Injection (ETI): Synchronizes A Node (Time Server) With An External Time (Usually UTC Reference)  Clock Synchronization (CS) : Synchronizes All Nodes With The Time Server Node .  Time Management Services:  High Resolution Timers (HRT) : Provides High Resolution Timers To Application Programs  Time Management (TM) : Provides The Functionality To Work With Different Time Bases (Defined With New Offsets And Speeds).  Distributed Simulated Time (DST ) 01/04/2004 Version 6 UBSS Product 44 Multidomain Control Center

UBSS : TCM Context Diagram HRT HRT HRT (External) Clock_System tcm_store tcm_store tcm_store CS CS TS ETI clock system input 01/04/2004 Version 6 UBSS Product 45 Multidomain Control Center

Time request and transmission delay Request Time Client (CS) Server Latency Response Time Server (TS) 01/04/2004 Version 6 UBSS Product 46 Multidomain Control Center

Input Output Calls (IOC) : Scope  Input Output Call Services Two kinds of servers provide synchronous or asynchronous services via an IOC library. Files and Tape management services : IOC_SERVER Printing services : IOC_LPR_SERVER The result of the operation is sent after completion in an application FIFO, whose name is given as an input parameter of the call. Possibility to use several servers (IOC_SERVER) to perform several operations in parallel 01/04/2004 Version 6 UBSS Product 47 Multidomain Control Center

UBSS : IOC Context Diagram IOC servers IOC filter printer Application IOC Software library tape Disk IOC filter Disk printer Machine X Machine Y 01/04/2004 Version 6 UBSS Product 48 Multidomain Control Center

Multi Purpose Telecommunication Management (MTM) : Scope System external telecommunication management server Multi protocol management Available protocols are :  ISO TP4  X25  ARTAS : PDC (Private Data Channel 01/04/2004 Version 6 UBSS Product 49 Multidomain Control Center

Distributed Sequencing Services (DSS) Based on CDC Generic service for up to 32 sequences Each sequence controllable by keyword or key 01/04/2004 Version 6 UBSS Product 50 Multidomain Control Center

Dynamic Trace Utility (DTU) : Scope Dynamic Probes And Traces Services : Lib, Server, GUI On-Line Circular Files Data Storage And Trace Activation Off-Line :  Data Filtering With Unix Regular Expressions  Statistic Data Analysis : Mean And Standard Deviation Multi-Platform : Ultrix, Digital Unix, HP-UX, Solaris. Logical Name For Traces Identification For Management Spreadsheet Standard Files Format For Performances Documents Report UBSS Independent. 01/04/2004 Version 6 UBSS Product 51 Multidomain Control Center

UBSS : DTU principles Shared memory TCP sockets DTU DTU DTU DTU DTU User DTU process GUI library application process GUI library message queue other applications... traces circular files files 01/04/2004 Version 6 UBSS Product 52 Multidomain Control Center

UBSS Evolutions  Hard Real Time.  Wide Area Network (WAN) Distribution.  NTP (Network Time Protocol)  RPC (Remote Procedure Call)  Call Back Framework  CORBA (Common Object Request Broker Architecture) Compliance 01/04/2004 Version 6 UBSS Product 53 Multidomain Control Center

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