CORBA Controls Workshop, Grenoble 9-11 October, 2002 ACS CORBA-based Common Software for ALMA and other projects G.Chiozzi*, B.Gustafsson*, B.Jeram*, P.Sivera* M.Plesko**, M.Sekoranja**, G.Tkacik**, K.Zagar**, D.Fugate*** *ESO, ** CosyLab, *** NRAO

ALMA Project 2CORBA Controls 2002ALMA Common Software Contents What is ALMA? Why a common software? What are the key ideas in ACS? What is the Architecture of ACS How are we going to go on? Who is using ACS? How can you get more information

ALMA Project 3CORBA Controls 2002ALMA Common Software ALMA Project in Summary Joint project between astronomical organisations in Europe and North America (and Japan) m antennas (25 microns, 0.6”) Array configurations:150m-10 Km Near S.Pedro de Atacama, Chile at 5000m Imaging capability over mm range 10 receiver bands very high resolution correlator

ALMA Project 4CORBA Controls 2002ALMA Common Software ALMA Common Software (ACS) ALMA project is highly distributed: many sites and many “development cultures” ACS aims at providing an answer to the following needs: –common application framework and programming model, not just libraries –well tested software that avoids duplication –make upgrades and maintenance reasonable –incremental development via Releases –standardisation offering environment with design patterns and their implementation (rather than pure rules). –common configuration control/installation procedures It worked on a comparable size project: the VLT

ALMA Project 5CORBA Controls 2002ALMA Common Software ACS start-up: Summer 1999 Preliminary discussions on ACS objectives and structure: –experience from VLT and other projects –New technology: CORBA, Java, XML Decided to start from existing product, to make use of CORBA experience. Collaboration with JSI-Ljubljana to further develop existing system built for High Energy Physics (ICALEPCS ‘99, Trieste).

ALMA Project 6CORBA Controls 2002ALMA Common Software ACS Architecture ApplicationsCORBA Middleware ACEDevelopment tools 1 - Base tools Device Drivers Error SystemLogging SystemAstro librariesBACITime SystemData channel 2 - Core packages Java Component Config DBC++ Application Framework FITS librariesUIF librariesScripting 4 - Hi-level APIs and tools...more to come... Java Application Framework ACS Installer Command System Alarm SystemArchiving System MACI Manager 3 - Services Java Container Serialization Plugs Activator

ALMA Project 7CORBA Controls 2002ALMA Common Software Component-Container Model A Component-Container based architecture emphasizes Separation of Concerns. Same idea as.NET, EJB, CCM Container manages components –Lifecycle interface (init, start, stop, update) –Service interface (what component offers) –Optional: security, persistency, transactions… Client... Container Component 1 Component 2 Component 3

ALMA Project 8CORBA Controls 2002ALMA Common Software ACS Deployment diagram

ALMA Project 9CORBA Controls 2002ALMA Common Software DO-Property-Characteristics DO: base class for any physical/logical Device (e.g. temperature sensor, motor) Each DO has Properties (e.g. status value, position - control/monitor points) Characteristics of Dos and Properties (Static data in Configuration DB, e.g. units, ranges, default values) ABeans Property DO_name() DO 0..n NamedComponent name() description() version() URI() get_interface() get_characteristic_by_name() find_characteristic() Characteristic 0..n type RWProperty set_sync() set_async() increment() decrement() type ROProperty get_sync() get_async() create_monitor() Device (from Examples) type MonitorPoint (from Examples) type ControlPoint (from Exampl... Control system Devices are Distributed Objects Thermostat (from Exampl... An example of Device Examples of user defined classes:

ALMA Project 10CORBA Controls 2002ALMA Common Software Configuration Database Defining accessing and maintaining the configuration of a system Three-tier database-access architecture: –Database engine –Database Access Layer (DAL). –Database clients CORBA access interface XML/Schemas for OO data definition and access. Database DAL/CDB Server Data client CDB Administrati on 3 – Database clients 2 – Database Access Layer (DAL) 1 – Database engine Read-write admin. interface Read- only Data interface

ALMA Project 11CORBA Controls 2002ALMA Common Software Configuration Database: DO Schemas

ALMA Project 12CORBA Controls 2002ALMA Common Software Abeans visual editing

ALMA Project 13CORBA Controls 2002ALMA Common Software TICS Control Panel

ALMA Project 14CORBA Controls 2002ALMA Common Software OE and Admin Client

ALMA Project 15CORBA Controls 2002ALMA Common Software Supported Platforms Operating system: Linux, SUN OS, (MS- Windows) Real-time: VME,VxWorks (Phase1), CAN bus Languages: C++, JAVA, Python CORBA middleware: TAO (& ACE) (C++), Orbacus (Java), Omniorb (Python), CORBA services.

ALMA Project 16CORBA Controls 2002ALMA Common Software ACS Documentation

ALMA Project 17CORBA Controls 2002ALMA Common Software ACS Installations IRAM Granada Lofar UK ATC DRAO Penticton NRAO Socorro, VLA NRAO Tucson NRAO Charlotsville ESO La Silla IRAM Grenoble ESO NAOJ IJS/Cosylab Ljubljana AOT Trieste MPI Bohn ANKA Uni. Bochum

ALMA Project 18CORBA Controls 2002ALMA Common Software ACS Status Oct. 2000: ACS v.0.0 (Prototype) Dec. 2000: KP test Sep. 2001: ACS Architecture Document Sep.2001: ACS 1.0 Apr. 2002: ACS 1.1 (support for TICS) In use in Test Interferometer Software (TICS) prototype Nov. 2002: ACS 2.0 We plan an incremental release every 6 months

ALMA Project 19CORBA Controls 2002ALMA Common Software ALMA Sites Chajnantor

ALMA Project 20CORBA Controls 2002ALMA Common Software Conclusion Developed based on the experience of both astronomical and accelerator control projects Can easily run on many platforms Open source (GPL licence) Free development tools and ORBs We think that many other projects can use ACS A wider user’s base can provide valuable feedback

ALMA Project 21CORBA Controls 2002ALMA Common Software Extra slides The following pages contain some extra slides that we do not plan to show at the conference, but that could be useful.

ALMA Project 22CORBA Controls 2002ALMA Common Software Data Channel

ALMA Project 23CORBA Controls 2002ALMA Common Software DO

ALMA Project 24CORBA Controls 2002ALMA Common Software Logging

ALMA Project 25CORBA Controls 2002ALMA Common Software Management and Access Control

ALMA Project 26CORBA Controls 2002ALMA Common Software Archiving System

ALMA Project 27CORBA Controls 2002ALMA Common Software How much effort in ACS 1.1? Source lines of code (for comments add about 10%) for: –ACS cmm Modules (code developed for ACS) –Java Abeans (mostly code inherited from ANKA) SLOC Directory SLOC-by-Language (Sorted) ACS cpp=61536,sh=129,tcl=28,sed=23,csh= Java java= Total Physical Source Lines of Code = Estimated Development Effort in Person-Years = (Basic COCOMO model, Person-Months = 2.4 * (KSLOC**1.05)) Total Estimated Cost to Develop = $ (average salary = $56286/year, overhead = 2.4). Data generated using 'SLOCCount' by David A. Wheeler More than 2000 pages of printable design/reference documentation