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SOA for Antelope. Web Services for Antelope-based Observing Systems. Tony Fountain ([email protected]) Longjiang Ding ([email protected]) Neil Cotofana ([email protected]) April 2005. Overview. Web Services Motivation Web Services Solution Overview Services Details: implemented actions

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Soa for antelope l.jpg

SOA for Antelope

Web Services for Antelope-based Observing Systems

Tony Fountain ([email protected])

Longjiang Ding ([email protected])

Neil Cotofana ([email protected])

April 2005


Overview l.jpg
Overview

  • Web Services Motivation

  • Web Services Solution Overview

  • Services Details: implemented actions

  • Services-Antelope interface layer

  • US Array Usage Scenario

  • WS-RF and Security

  • Status and Plans


Web services motivation l.jpg
Web Services Motivation

  • Why WS for Antelope:

    • Provide foundation for Antelope control system that is efficient, scalable among many-orb/rtexec systems topology

    • Loosely-coupled base for automating many Antelope manual configuration processes (e.g. US Array)

    • Basis for client-side system-manager applications (e.g. Kent’s system operator portal )


Roadnet web services solution l.jpg
ROADNet Web Services Solution

  • Web Services Software Stack

    • Web Services application environment bundled with ROADNet software suite and installed by default on newly deployed Orb hosts

      • JDK 1.4.2

      • Jakarta Tomcat 4.1.x (application server)

      • Apache AXIS 1.2 (Soap Server)

    • Modular Web Services for Antelope for configuration and control of Orbs and related processes

  • Supports various deployment scenarios:

    • Central ORB configuration

    • Distributed, multiple ORBs configuration

  • Orb Control Web Services

    • Initially focus on

      • Rtexec task manager system

      • Orbmonrtd ORB topology manager system

      • Q3302orb datalogger manager system

    • Behavior of deployed real-time system can be dynamically modified via control web services (e.g. turn on/off process, add/remove process)


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Conceptual SensorNet Architecture

Web Client

Standalone Client

Workflow

Portal

Kepler

Web Services

Event Detection

RT Monitoring

Command Control

Analysis

SensorNet Middleware

Antelope

Lab Resources

Field Devices

Databases

Analysis

Sensors

Actuators

Visualization

Dataloggers

Resources


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Desktop and Mobile Users

Geospatial SensorNet Architecture

Standaloneweb service clients

Portal Server

WSDL

WSDL

SOAP Servers

SensorMiddleware

Sensors

Lab Resources

Datalogger

Field Devices


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Antelope Web Services (Details)

  • Currently implemented rtexec services include:http://phalanx.sdsc.edu:8080/SensorService/services/Rtexec?wsdl

    • getAllProcesses:

      • retrieve all the defined processes within rtexec “Processes” array

    • getAllOnProcesses:

      • retrieve all processes listed as “on” within the rtexec “Run” table

    • getStatus4Process:

      • get status info. ('on' or 'off') of given process within “Run” table

    • turnOnAProcess:

      • turn on a given process within rtexec “Run” table

    • turnOffAProcess:

      • turn off a given process within rtexec “Run” table

    • restartAProcess:

      • restart a given process with an optional delay before restart

    • addANewProcess:

      • add a new process into the rtexec

    • removeAProcess:

      • remove a process from the rtexec

    • getPfFile:

      • retrieve whole content of rtexec entity as string for viewing or editing


Antelope web services details8 l.jpg
Antelope Web Services (Details)

  • Currently implemented orbmonrtd services include: http://phalanx.sdsc.edu:8080/SensorService/services/Orbmonrtd?wsdl

    • getAllSources:

      • retrieve all the defined sources within orbmonrtd “Sources” table

    • addANewSource:

      • add a new source into the orbmonrtd

    • removeASource:

      • Remove a source from the orbmonrtd

    • getPfFile:

      • retrieve whole content of orbmonrtd entity as string for viewing or editing

  • Currently implemented q3302orb services include: http://phalanx.sdsc.edu:8080/SensorService/services/Q3302orb?wsdl

    • getAllDataloggers:

      • retrieve all the defined dataloggers within q3302orb “Dataloggers” table

    • addANewDatalogger:

      • add a new datalogger into the q3302orb

    • removeADatalogger:

      • Remove a datalogger from the q3302orb

    • getPfFile:

      • retrieve whole content of q3302orb entity as string for viewing or editing


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Services-Antelope Interface: Pf2Java

  • Pf2Java:

    • Java package for parsing and representing Antelope PF “entities” or specific PF files

    • Handles the cascading/composite definition of certain PF entities via the $PFPATH system variable

    • Naming conventions parallel those found in existing Antelope APIs (where possible)

  • Motivation:

    • Antelope system relies heavily on parameter files (PF). System behavior can be modified at run-time by editing these files programmatically (e.g. rtexec.pf)

  • Description of classes:

    • User classes:

      • PfValue

      • PfArray (extends PfValue)

      • PfTable (extends PfValue)

      • Pf (extends PfArray)

    • System classes: (used by Pf class to parse PF files)

      • AntelopePfLexer

      • AntelopePfParser

      • AntelopePfParserSymbol

    • Dependencies:

      • java_cup.runtime library required for compiling and executing Java code

    • Built with:

      • Java CUP parser builder API (GPL open source software)

      • FLEX lexer/tokenizer builder API (GPL open source software)


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US Array Usage Scenario

  • Activity: provisioning new monitoring sites

  • Candidate tasks for Web Services:

    • Data Logger Configuration (q3302orb.pf)

    • Transition from “prelim” Orb to “production”

    • Update Display Tools (orbmonrtd.pf)

  • Case Study: Transition from “prelim” Orb to “production” Orb

  • Web Service tasks:

    • Remove connection from Data Logger to Prelim Orb

    • Add connection from Data Logger to Production Orb

    • Notify data logger to send future data to new Orb

  • Can be triggered from Web Portal interface

  • Diagram:

q3302orb

serviceremove datalogger

Prelim

Orb

1.

X

Web

Portal

Data

Logger

q3302orb

serviceadd datalogger

2.

3.

Product

-ion

Orb

orbmonrtd

serviceadd source


Slide11 l.jpg

US Array Scenario: adding new ORB-based sensor station

1. Get notification (email, call)

2. Gather info. (Data Logger type, IP Address, password, comm. Type)

3. Init communication with datalogger(edit param file: q3302orb.pf)

4. Verify Data Transmissionwith dlmon

5., 6. Get lat/lon, verify lat/lon

7. Build DB: add info into “prelim” DB

8. Wait 24 hours, check data

10.a Update real-time displays (orbmonrtd.pf files)

9. Transfer info from prelimto production DB

(Send metadata to down-stream users through ORB; send email notification)

Site is now operational.

Begin real-time QA/QC cycle

10.b Regenerate Travel Time stuff (ttgrid.pf); restart orbassoc

Web service automated process

10.c Update NAGIOS config files

Interactive manual process


Antelope wsrf extensions l.jpg

SoapRequest

Proxy Cert

Soap Body

Request Params

WS-Resource

WS-Resource

WS-Resource

WS-Resource

WS-Resource

WS-Resource

WS-Resource

Antelope WSRF Extensions

Services Repositoryname, definiton, others

Proxy RepositoryCerts,username, password, others

Soap Header

ORB

Manager

Databaseoperator

LookupService

Portal

WSRF

Authentication

& Authorization

ORB

commander

SOAP/HTTP

Data Analyzer

ORB

Monitor

Event Coordinator

ServiceInvoker

Antelope Web Services

Services

Subscriber

OtherServices

field digitizer

Object Ring Buffer

Field Interface Module

field digitizer

Databases

ORB Operations:

Orb ImportOrb ExportProcessingArchiving

Antelope Executive Module

field digitizer


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Security in WSRF

  • WS Authentication Authorization in GT4

    • Replacement of Grid Security Infrastructure (GSI)

    • Included:

      • Message level security which implements two standards:

        • WS-Security

          • Describes enhancements to SOAP messaging to provide quality of protection through message integrity, message confidentiality, and single message authentication

          • Provides a general-purpose mechanism for associating security tokens with messages

          • Describes how to encode binary security tokens

        • WS-SecureConversation

          • Layered on top of WS-Security

          • Mechanisms for establishing and sharing security contexts as well as deriving session keys from security contexts

          • Suitable for multiple messages exchanged between service provider and consumer

      • Authorization framework

        • Handle many authorization schemas including grid-mapfile, access control lists (ACL), and custom authorization handlers via the Security Assertion Markup Language (SAML) protocol

  • GT4: the new WSRF implementation (release in Jan. 31, 2005)


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Status and Plans

  • Current Status

    • Antelope web services:

      • Rtexec: http://phalanx.sdsc.edu:8080/SensorService/services/Rtexec?wsdl

      • Orbmonrtd: http://phalanx.sdsc.edu:8080/SensorService/services/Orbmonrtd?wsdl

      • Q3302orb: http://phalanx.sdsc.edu:8080/SensorService/services/Q3302orb?wsdl

    • Pf2Java package foundation complete and functional

  • Plans

    • Security:

      • For initial, prototype services, will have IP Address-based access controls to Web Services (a la Antelope native security system)

      • For longer term, will implement certificate-based security, taking advantage of WS-RF security APIs and mechanisms

    • Web Portal: web-based collection of customized web services clients for various domain applications

      • Make use of underlying Antelope Web Services

      • Certificate-based user authentication system

    • Integrate the latest WSRF standards for authentication/authorization of WS execution

    • Elaborate on US Array case study (adding a new monitoring site)

    • Integrate into KEPLER workflow system


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