Málaga meeting, WEST-T4. May 22-25. Pag. 1

Trading for COTS components in Open Environment

EUROMICRO’2001http://www.euromicro.org

WEST – T4. Málaga, May 22-25

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Introduction

top-down bottom-up

- times

- costs

- efforts

+ flexibility

+ reliability

+ reusability

RepositoryOff-the-shelf components

Software development

CBSE

trader

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A trader service

trader

exporter importer

export() 2 query()

13

4

5

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Requirements for a COTS trader

Heterogeneous component model

Federation

Service composition and adaptation

Multiples interfaces.

Softmatchmaking

Signature information is not enough

Use of heuristics and metrics

extensible/scalable

automatic/store and forward

push/pull models

Delegation

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Current traders

ODP model: ODP trading service, ISO/ITU-T.

• ORBacus (OOC/IONA). http://www.ooc.com

• OpenORB (Intalio). http://www.openorb.org

• AceORB (TAO). http://www.cs.wustl.edu/schmidt/ACE

• VisiBroker (Borland). http://www.borland.com/visibroker

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ODP trader shortcomings

1. Use homogeneous object model.

2. Use direct federation.

3. Do not allow service composition or adaptation.

4. Exact matches at the signature level only.

5. Do not allow multiple interfaces.

6. They are based on a push model only.

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Services and service types

ODP trading service specification:

“A service is a set of capabilities provided by an object at a computational level. A service is an instance of service type”

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COTStrader

COTS XML repository

export

import

WEB

EXPORT

INTERFACE

WEB

IMPORT

INTERFACE

EXPORTER

IMPORTER

templates

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COTStrader: spec template

Functional Non Functional

Marketing

Packaging

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COTStrader

module OnePlaceBuffer {

// Provided interfaces

interface OnePlaceBuffer {

void write(in long x);

long read();

};

// Required interfaces

interface out {

oneway void print(in long x);

};

};

Example

CORBA IDL

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COTStrader

COTS XML repository

export

import

WEB

EXPORT

INTERFACE

WEB

IMPORT

INTERFACE

EXPORTER

IMPORTER

templates

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  <?xml-stylesheet type="text/xsl" href="http://www.cotstrader.com/COTS-XMLStyle.xsl"?>   <COTScomponent name="OnePlaceBuffer"        xmlns="http://www.cotstrader.com/COTS-XMLSchema.xsd"        xmlns:types="http://www.w3.org/2000/10/XMLSchema">

  <functional> ... </functional>

  <properties> ... </properties>

  <packaging> ... </packaging>

  <marketing> ... </marketing>

</COTScomponent>

COTStrader: Exporting

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 <functional>

<providedInterfaces> . . . </providedInterfaces>  <requiredInterfaces>. . .</requiredInterfaces>

 <serviceAccessProtocol>. . . </serviceAccessProtocol>

 </functional>

COTStrader: Exporting

Functional information:

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<providedInterfaces>

  <interface name="OnePlaceBuffer">     <description notation="CORBA-IDL">  ´ interface OnePlaceBuffer {               void write(in long x); long read();           };     </description>     <behavior notation="Larch">       <description notation= "Java/Larch"         href="http://www.cotstrader.com/samp/OPB/OnePlaceBuffer.beh"       </description>       <exactMatching href="http://liribarn.ual.es:8080/servlet/Larch.exactMatch"/>       <softMatching href="http://liribarn.ual.es:8080/servlet/Larch.softMatch"/>     </behavior>   </interface>

</providedInterfaces>  

COTStrader: ExportingFunctional information example: providedInterfaces.

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  <requiredInterfaces>

    <interface name="out">

      <description notation="CORBA-IDL">         interface out {              oneway void print(in long x);           }       </description>

    </interface>

  </requiredInterfaces>

COTStrader: Exporting

Functional information example: requiredInterfaces.

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<serviceAccessProtocol>    <description notation="pi-protocols">      OnePlaceBuffer(ref,out) = ref?write(x,rep).out!print(x). rep!().Full(ref,out,x);     Full(ref,out,x)=ref?read(rep).rep!(x).OnePlaceBuffer(ref,out);   </description>

  <exactMatching href="http://liribarn.ual.es:8080/servlet/PI.exactMatching"/>

  <softMatching href="http://liribarn.ual.es:8080/servlet/PI.softMatching"/>

</serviceAccessProtocol>

COTStrader: Exporting

Functional information : serviceAccessProtocol.

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  <properties notation="W3C">     <property name="securityLevel">        <type>xsd:string</type> <value>SAFE</value>     </property>

    <property name="capacity">        <type>xsd:int</type> <value>1</value>     </property>

    <property name="isRunningNow">        <type>xsd:bool</type> <!-- dynamic property -->       <value href=“...8080/servlet/OnePlaceBuffer.running"/>    </property>

    <property name="keywords">        <type>xsd:string</type> <value>storage,bounded</value>     </property>   </properties>

COTStrader: Exporting

Non Functional information example: properties.

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<packaging>    <description notation="CCM-softpkg“ href=“.../OPB/Impl_OnePlaceBuffer.csd"/> </packaging>

COTStrader: Exporting

Packaging/architectural information example: packaging.

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<?xml version="1.0"?><softpkg name="OnePlaceBuffer_services" version="1.0"> <pkgtype>CORBA Component</pkgtype> <title>OnePlaceBuffer</title> <description>A descriptor example for cotstrader.com</description> <idl id="IDL:example/OnePlaceBuffer:1.0"> <link href="http://www.cotstrader.com/samples/OPB/OnePlaceBuffer.idl"/> </idl> <implementation> <os name="Win95"/> <os name="WinNT" version="4.0"/> <os name="AIX"/> <processor name="x86"/> <processor name="sparc"/> <runtime name="JRE" version="1.3"/> <programminglanguage name="Java"/> <code type="jar"> <fileinarchive name="services.jar"/> <entrypoint>services.OnePlaceBuffer</entrypoint> </code> <threadsafety level="instance"/> <dependency type="ORB"> <name>ORBacus</name> </dependency> </implementation></softpkg>

CCM: http://www.cotstrader.com/examples/OPB/Implement_OnePlaceBuffer.csd

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  <marketing>     <license href="http://www.cotstrader.com/examples/OPB/license.html" /> 

    <expirydate>05-10-2001</expirydate>      <certificate href="http://www.cotstrader.com/examples/OPB/lcard.png"/> 

    <vendor>       <companyname>E-Brokering corp.</companyname>       <webpage>http://www.e-B.com</webpage>       <mailto>sales@e-Brokering.com</mailto>       <address>         <zip>04120</zip>         <street>Ctra Sacramento s/n</street>         <city>Almeria</city> <country>Spain</country>          <street>Campus de Teatinos</street>         <city>Málaga</city> <country>Spain</country>        </address>     </vendor>     <description>A one-place buffer</description>   </marketing>

COTStrader: Exporting

Marketing information example: marketing.

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COTStrader

COTS XML repository

export

import

WEB

EXPORT

INTERFACE

WEB

IMPORT

INTERFACE

EXPORTER

IMPORTER

templates

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COTStrader: Importing

<?xml version='1.0'?> <COTScomponent name="Query1"                  xmlns="http://www.cotstrader.com/COTS-XMLSchema.xsd">

   <functional>      <providedInterfaces>        <interface name="OnePlaceBuffer">          <description notation="CORBA-IDL">             interface OnePlaceBuffer {                void write(in long x);                long read();             }          </description>        </interface>      </providedInterfaces>    </functional>    <properties>      <property name="securityLevel"> <type>xsd:string</type> </property>      <property name="isRunningNow"> <type>xsd:bool</type> </property>    </properties>

</COTScomponent>

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COTStrader: Importing

<COTSquery name="ClientQuery"            xmlns="http://www.cotstrader.com/COTS-XMLSchema.xsd">

  <COTSdescription href="http://www.cotstrader.com/Query1.xml" />

   <functionalMatching>

     <interfaceMatching>

       <exactMatching

href="http://www.cotstrader.com/cgi-bin/exactMatch.cgi" />

     </interfaceMatching>

     <serviceAccessProtocolMatching>

<softMatching />

</serviceAccessProtocolMatching>

  </functionalMatching>

... 

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COTStrader: Importing

  <COTSquery name="ClientQuery"              xmlns="http://www.cotstrader.com/COTS-XMLSchema.xsd">

. . .

   <propertyMatching>      <constraints notation="XQuery">

(securityLevel = SAFE) and (isRunningNow = TRUE)      </constraints>      <preferences notation="ODP">firts</preferences>    </propertyMatching>

   <packagingMatching notation="XQuery">     description/notation = "CCM-softpkg" and      ( description/implementation/os/name = "WinNT" or         description/implementation/os/name = "Solaris" )    </packagingMatching>

   <marketingMatching notation="XQuery">     vendor/address/country = "Spain"    </marketingMatching>

  </COTSquery>

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COTStrader

Two kinds of matchings: Exact Soft E

Functional:

Properties, packaging and marketing:

Constraints and preferences, XQuery (W3C)

Constraints : >, <, >=, <=, =, !=, not, and, or.

Preferences : first, random, min(expr), max(expr)

S

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COTStrader

COTS XML repository

export

import

WEB

EXPORT

INTERFACE

WEB

IMPORT

INTERFACE

EXPORTER

IMPORTER

Query templates

CORBA/ORBacus

Linux/Java

Apache/ServerTomcat/Servlets

Soft/exact matching

XQueryXQEngine