description and manual
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1. Figure 4 1 6 Find a Service ae Logout DBGlobe IST 2001 32645 Proof of Concept Prototype View service search results In Figure 4 1 7 the user can see the results of the search request The results contain the 1 Service name Users must be aware about the service name in order to invoke it through their applications ii Provider Provider name is important in case we wish to provide quality of services A user may prefer services that are provided by a specific user because the last is reliable iii Link to the wsdl of the service As mentioned earlier the wsdl description is very important in case that user wish to invoke the service through his applications In that case he has to be aware about the service profile in order to invoke the appropriate service iv Set of keywords Those keywords give an outline of the service characteristics rT DBGlobe IST 2001 32645 Logout eer teen FA neng HEWS gport SPORT good word contact sport character reference character referanea boxing pugilism fisticuffs Aladdin allusien professional boxing pumch up Figure 4 1 7 Search Results 18 DBGlobe IST 2001 32645 Proof of Concept Prototype Logout At the top right of each page the user can select the logout link to exit from the system 19 DBGlobe IST 2001 32645 Proof of Concept Prototype 4 2 Manual for the Proof of Concept Prototype In the previous paragraph we pres2. 5 The functions of a SpotMe server are the following a Create group of friends cooperators Furthermore SpotMe servers are also able to 1 Add Delete Edit a friend cooperator This is achieved by asking the SpotMe server to add delete edit him il Show the user location This capability exhibits location management DBGlobe with the aid of communities answers these questions b Find a service based on keywords exhibits communities In order to find a service the SpotMe servers ask directly the relative communities or through the DBGlobe system for a list of services that match the given keywords 6 Get Services that belong to a specific category exhibits communities Again to achieve this DBGlobe communities are utilized When a SpotMe client asks for services it does so through the SpotMe application What that means is that it requests from the SpotMe server to find him all the services belonging to the specific category SpotMe servers forward the request to the appropriate community or to the DBGlobe system and get the wanted answer which is then returned to the client All the previous capabilities are very important and necessary for any context aware application their availability through the DBGlobe system enables the applications to be built rapidly and without the need to implement the whole system from scratch Additionally due to the use of web service protocols the application can be implemented in a variety
3. 4 Communities _15 DBGlobe IST 2001 32645 Proof of Concept Prototype Register a service The user is able to register his services to the system using the form of Figure 4 1 1 He must provide the name of the service a set of keywords that describes the service the running url and the WSDL url DBGlobe IST 2001 32645 Logout Register Your Service Register Service search For A Serice Provider chara Service Name _ Keywords Delim keywords with Running Us oo WSDL Ud oO required fields Figure 4 1 5 Register a service _16 DBGlobe IST 2001 32645 Proof of Concept Prototype Find a service The DBGlobe system provides through the form of Figure 4 1 6 the capability to find a service In order to find the service the user must enter a set of keywords that describes the characteristics of the services that he wishes to find e g if the user wishes to find the available weather services he can fill the box with keywords like news and press the submit The request will be forwarded to a CAS which will forward the request to the communities that match the given keywords The communities will execute the query Select services where description contains 999 Ge 99 news The keywords must be separated by using DBGlobe IST 2001 32645 Register Your Service Search For A Service Find Service News keywords supperate keywords with
4. eth ene 13 Using the DBGIOBE SYStem icccecccccccccccccccsceceescescsesecsssesecsseesssesessseessseseenseesseess 14 View Communi ie sxvcigulpctia needs E eee 15 RECIT CLS CIVIC Oar DG ea hc crs a ee uN edhe 16 FIO SCP VIGO sot ncn hacia oss aiattaion eo osbe hain GSiand fotos N 17 View SIn ece Sear NFSU S ata e hoe te te dabetsatete aeholhiak 18 LOCO oaae E E A E E 19 4 2 Manual for the Proof of Concept Prototype 0 cece 20 keo A VOTIVE VS E si citi E cae ance eee 21 Toom TO TMC ADL UC GION sitet eters has int ae ila tel Sea cysiln sinh acc sock Sechelt 22 View VOUT CLOUD and JVICNOS aisea ch na N de 23 View anA ArI POU E EE S SN 24 APPC ON OPU ONS soeren RER E E E 25 Frend Manatee serasa a a eds eek asada tales Detecd 26 EPICS VI GHA SCINGNE Sir EEE EEE E E O TE 28 CONC O SVI C OS aa eat ic E EE E E E 29 ROS ANWES IS CO E E eee ane EN eee 31 LOS OU E EE ETATE E E AAEE OAE NAE 32 Concl slon Sacra A E 33 DBGlobe IST 2001 32645 Proof of Concept Prototype 1 Introduction A concept central to the DBGlobe system is the concept of a context aware ad hoc database This concept and the associated query processing mechanisms were presented in Deliverable D14 The objective of the query mechanism is to support context continuous and containment queries as efficient as possible around the notion of community taking into account problems such as disconnections and device limitations In order to test and provide a proof of concept proto
5. in Figure 4 2 7 He must provide 1 the Service name 11 the keywords that give an outline of the service characteristics 111 the end point url this is where the application runs iv the wsdl url this url will be used by the user in order to be aware about the service interface Friend List Add Friend Register a service _ ___ Keywords Figure 4 2 9 Register a new service 37 DBGlobe IST 2001 32645 Proof of Concept Prototype Logout Finally the user can click the link logout of the top menu to exist the system 35 DBGlobe IST 2001 32645 Proof of Concept Prototype Conclusions In this deliverable we describe the proof of concept prototype In detail we showed how communities can help answer not only location based queries but semantic level ones in an organized and efficient manner The fact that communities define create ad hoc databases around concepts and not just around location enabled our prototype application to achieve itss goals That 1s communities enabled SpotMe to find and keep track of all friends that have similar interests with a given user Finally as shown in order to enable keeping constant track of friends we needed to utilize continues queries It is clear that without the utilization of communities some tasks would be extremely difficult to implement within the scope of a relatively small application To summarise in this deliverable we presented SpotMe a
6. remote procedure calls and responses In order to handle the SOAP messages we use Axis Axis is essentially a SOAP engine a framework for constructing SOAP processors such as clients servers gateways etc The current version of Axis is based on Java Because DBGlobe uses AXML framework that allows using arbitrary SOAP based web services and also pecifying and using more elaborate services that may query and update AXML documents 8 9 10 we can also use this framework to establish service calls to the registered services The AXML framework is centered on AXML documents which are XML documents that contain service calls to web services The AXML framework is ideal DBGlobe IST 2001 32645 Proof of Concept Prototype for data and web service integration The context of an AXML document is dynamic since you can specify when a service call should be activated and for how long the results are valid AXML allows also calling continuous services that provide stream of answers and service supporting intentional data AXML documents including service calls as parameters and or result Our application prototype has been implemented by using java technology JSDK 1 4 1 web server Tomcat 5 and Mysql as database technology The Tomcat service is responsible to execute the dynamic pages and the Mysql database management system is used for storing information about the users their friends and their options The rest of the informatio
7. 32645 Proof of Concept Prototype Application Options Figure 4 2 5 shows the two basics options of the application Firstly the user can be alerted when other users add him in their contact list Secondly the user can be alerted when a friend publish a new service Friend List Add Friend Preferences Alert me when other people add me to their contact list Alert me when my friends publish new service Qo itp tnternet Figure 4 2 5 Application options 25 DBGlobe IST 2001 32645 Proof of Concept Prototype Friend Management Figure 4 2 5 1 exhibits the page that opens by clicking the link Add friend at the top menu Friend List Add Friend Add anew Friend ESSIE z aooo l l mee S Figure 4 2 6 1 Add a new friend Figure 4 2 6 1 shows the form that is available to add a new friend by giving either the login of the new friend or the email The result of the form filling is the shown in Figure 4 2 6 2 where the user can select the user that wishes to add to his list by clicking the select link 26 DBGlobe IST 2001 32645 Proof of Concept Prototype Friend List Add Friend Select user login Email select chara charai lucy ac cy Figure 4 2 6 2 Select the new friend The next step is to select the group to which the new friend will be added Finally the friend will be added to the list If the new friend wishes to be informed when someone adds him to his list then the fri
8. DBGlobe IST 2001 32645 DBGlobe A Data Centric Approach to Global Computing Deliverable D15 Prototype System for Location Aware Query Processing description and manual Report Version 1 0 Report Preparation Date December 15 2003 Delivery Date to EC December 17 2003 Classification Public Contract Start Date 1 1 2002 Duration 36 months Estimated Person Months 10 Total Number of Pages 34 Project Coordinator University of Ioannina Contributing Partners University of Ioannina Institute National de Recherch en Informatique et en Automatique Computer Technology Institute Research Center of the Athens University of Economics and Business University of Cyprus University of California Riverside Project funded by the European Community under the Information Society Technologies Programme 1998 2002 DBGlobe IST 2001 32645 Proof of Concept Prototype Abstract Mobile devices or PMOs and wireless networking brings about a new computing paradigm where location and wireless services are of central importance Mobile devices as they relocate themselves create ad hoc databases around their current location A client usually requests a particular service that is of close proximity usually within his local Cell or CAS We can thus view location as a concept around which we pose queries Concept is a semantic notion and describes a specific property for example travelling weather taxi reser
9. answer questions that refer to multiple cells as it was described in D14 the same applies to the SpotMe application Additionally the SpotMe application the server of the application can request from the DBGlobe system to add user services or ask to find a service that will be answered by the related community The various steps needed to be taken and functions that are offered to make the SpotMe application operational are the following DBGlobe IST 2001 32645 Proof of Concept Prototype l Initialization of a SpotMe server During the initialization the server needs to know at least one CAS in order to be able to connect with the DBGlobe system Initialization of SpotMe clients The client just needs to know the address of a SpotMe server in order to login and start using the application Please note that in order to connect with the network a SpotMe client must be within range of a DBGlobe cell and therefore a CAS Login of a SpotMe client During its login a SpotMe client connects to a SpotMe server The functions a SpotMe client can perform through the SpotMe application are the following a Access to local services exhibits location management In order to do so a client needs to know which services are local to him Thus upon such a request the SpotMe server utilizes the location management of DBGlobe to both discover the requester location and the local to the requestor services Select services that contai
10. e account Through this account the user specifies some basic information about his identity Figure 4 1 1 presents the form with this required information DBGlobe Firstname oO o Lastname aaa email _ Mobile phone _ lt lt DEGlobe Login DBGlobe Password _ lt lt lt Figure 4 1 1 Register to DBGlobe 12 DBGlobe IST 2001 32645 Proof of Concept Prototype Login process Any user who wishes to use the DBGlobe system can have access to it after his login process As it shown in Figure 4 1 2 to access the system the user must enter his DBGlobe login and password DEBGlobe Login sd Password gt Figure 4 1 2 Login to the DBGlobe system _ 3 DBGlobe IST 2001 32645 Proof of Concept Prototype Using the OBGlobe system After the login process the user is presented with the page shown in Figure 4 1 3 DBGlobe IST 2001 32645 Register four Service Search For A Service Welcome to DBGlobe System Figure 4 1 3 DBGlobe system interface From this page a user can click the links that are presented on the left of the page Thus a user is able to e Register a new service e Search for a service e View available communities These actions are described next _14 DBGlobe IST 2001 32645 Proof of Concept Prototype View Communities Figure 4 1 4 presents all the available communities by giving their 1 uri first column 11 de
11. el between the DBGlobe system and the applications which can be built on top of it We focus on what features are provided by the DBGlobe system how SpotMe utilizes communities and how communities enable SpotMe to achieve its goals DBGlobe IST 2001 32645 Proof of Concept Prototype 2 Using the Prototype Application with Communities The DBGlobe system can be seen as a platform that enables context aware applications 1 e SpotMe to be build over it by providing them with a set of the necessary services i e locating user and services Figure 2 1 shows the layering of the system as a whole The context aware applications i e SpotMe can directly use through the web services protocol any CoAS or CAS Soap Calls Eo Soap Calls g g Soap Calls CAS Core Interface CAS Application Interface Figure 2 1 SpotMe connection with DBGlobe In more detail the SpotMe application is comprised of an application server and its clients The application server SpotMe server is connected with the DBGlobe system Figure 2 1 As depicted in Figure 2 1 our prototype implementation is not part of the DBGlobe system instead it is an application that utilizes DBGlobe SpotMe helps users locate their online friends as well as nearby services To achieve this it utilizes the DBGlobe mechanisms for location management and service discovery More specifically since DBGlobe uses the communities mechanism to
12. end will be added only after the new friends allows it SIT a DBGlobe IST 2001 32645 Proof of Concept Prototype Service Management At the top menu the user can select the link services This link will open the page that is shown in Figure 4 2 7 Friend List Add Friend Local Available Services Search for 4 service Register a service Figure 4 2 7 Manage Services From this page a user can follow either the link that shows the local available services or the link that allows to user to search for a service and finally the link that enables users to register their service _28 DBGlobe IST 2001 32645 Proof of Concept Prototype Search for services The page shown in Figure 4 2 8 1 opens after the user has click to the link Search for a service of Figure 4 2 7 Friend List Add Friend Search for a service Enter keywords Fil Figure 4 2 8 1 In the form of Figure 4 2 8 1 a user can enter a set of keywords that describe the service that he wishes to find Figure 4 2 8 2 shows the results 29 DBGlobe IST 2001 32645 Proof of Concept Prototype Friend List Figure 4 2 8 2 Search Results By clicking to the service name the user can open the service in a new window _ 30 DBGlobe IST 2001 32645 Proof of Concept Prototype Register a new service The user can fill the input fields of the form Figure 4 2 9 that opens when he clicks the link Register a service
13. ented a manual for using the DBGlobe system functions In this paragraph we present the manual for using the proof of concept prototype The major objective of the prototype is to create a tool that enables a user to exchange their services with the people they wish The prototype gives the ability to e Create a group of users e To add delete users e To register user services e To search for services e To search for services among those users e To find local services In the following paragraphs we present a short manual for the above 20 DBGlobe IST 2001 32645 Proof of Concept Prototype Register to the system Each user in order to use the prototype application must be a user of the DBGlobe system too This is important because as we mentioned earlier the context aware application implements only the application specific functions 1 e who is friend to whom for the remaining functionality e g get user location register service it makes calls to the DBGlobe system For example in the case that the application is requested to find the location of a user it must forward the request to the DBGlobe system if the user is not member of the DBGlobe then the request would not be answered Figure 4 2 1 presents the registration form DBGlobe Firstname oO lt o Lastname aaa Emaii L Mobile phone _ DBGlobeLogin DBGlobe Password Figure 4 2 1 Re
14. gister to the system SA DBGlobe IST 2001 32645 Proof of Concept Prototype Each user in order to login to the application must provide his login and password as shown on the Figure 4 2 2 spotme Logini password Forgot Password Register Figure 4 2 2 Login to the application 19 a DBGlobe IST 2001 32645 Proof of Concept Prototype View your group and friends Figure 4 2 3 shows the major screen of the application The user can see its group of friends colleagues partners For each member of the group the information displayed includes e His status online or offline online users have an orange signal offline users have a black signal e The name of friend e User location if available Each user name is a link to the user profile user filippos if you are nat fitimpos click here Friend List 5 Hot sam Delete available 5S chara athens Delete zi lbo itp internet Figure 4 2 3 Major application screen ae DBGlobe IST 2001 32645 Proof of Concept Prototype View friends partner profile Figure 4 2 4 exhibits users profile with the basic information Additionally there is a link that allows user to view the services that the friend provides Friend List Add Friend Profile Firstname George Lastname Samaras Login sam Email cssamaramucy ac cy Mobile g9 valable Services a loe ip tnternet 4 Figure 4 2 4 User s profile _24 DBGlobe IST 2001
15. n keywordslist near by 333 Cyprus DBGlobe in turn will provide the requested information by contacting the user s home location get the user s current location and find all services registered to the user s current location b View cooperating services exhibits location management and communities Cooperating services are the services offered by a friend or another SpotMe client that is in the same group with the requesting client An example of this would be for a SpotMe client that belongs to the programmer s community to ask its fellow programmers for a piece of Java code Select service where contains java code The answer to such a question can be easily given if we have in place a community for programmers and their services The only necessary action is to forward this query to the related CoAS s So a SpotMe client will ask through the application and thus the SpotMe server the DBGlobe system to find the services of the programmer s group The DBGlobe system in turn will forward this query to the relative community and get the requested answer DBGlobe IST 2001 32645 Proof of Concept Prototype c Register a service to the system exhibits communities A SpotMe client may offer some services to others To make this possible the client registers the SpotMe server of its services The server then registers those services to the DBGlobe system in order to be used by other users
16. n e g user services user location 1s provided by the DBGlobe system the application just calls the appropriate service Communities have also been implemented using java JSDK 1 4 1 and are distributed across the DBGlobe system In the following section we present how the application accesses the DBGlobe system and what kinds of services are provided by it 10 DBGlobe IST 2001 32645 Proof of Concept Prototype 4 User s Manual This section is i a manual that guides users on how to use the DBGlobe system and 11 a manual that guides users on how to use the context aware application prototype SpotMe In both cases a web based interface is provided to allow access by any kind of device no installation 1s required 4 1 DBGlobe System Manual Users can have access to the DBGlobe system by creating a DBGlobe account With this account users can have access to web based interfaces that enable them to do the following 1 Create an account 2 Login 3 View the available communities and the services that are registered to these communities 4 Register its services 5 Find any service that matches a set of keywords 6 Use any application that has been created on top of the DBGlobe system A short manual for each of the above processes follows ra by ee DBGlobe IST 2001 32645 Proof of Concept Prototype Creating a new account Any user who wishes to have access to the DBGlobe system must own a DBGlob
17. n application that utilizes DBGlobe communities in order to create and support real user communities aoe DBGlobe IST 2001 32645 Proof of Concept Prototype Bibliography 1 2 3 4 5 6 7 8 9 10 11 G Koloniari and E Pitoura Bloom Filters for Hierarchical Data Proceeding of the 5 Workshop on Distributed Data and Structures WDAS 2003 Services Definition Language WSDL Web page http www w3 org TR WSDL Ouzzani M Benatallah B and Bouguettaya A Ontological Approach for Information Discovery in Internet Databases Distributed and Parallel Databases Journal 8 367 392 2000 S Abiteboul O Benjelloum and all Active XML Peer to Peer data and web service integration Simple Object Access Protocol SOAP Web page http www w3 org TR SOAP Deliverable D3 Overall system architecture Deliverable D7 Final Simulator prototype and Simulator Web Page Deliverable D11 The query language of DBGlobe Deliverable D12 Query optimization and execution in DBGlobe Deliverable D14 Location Aware Ad hoc Databases and Query Processing and Beyond http ws apache org axis 34
18. of programming languages without compatibility problems In the following section we discuss in more detail such implementation issues DBGlobe IST 2001 32645 Proof of Concept Prototype 3 Implementation Issues The DBGlobe architecture can be seen as a middleware that enables the fast and efficient implementation of context aware applications In this section we present implementation issues and details for creating a context aware application over the DBGlobe system The DBGlobe system provides a web service interface that enables any application written in any programming language to have access to the services it provides by using SOAP 5 messages Example services provided by CAS s include the following e Find the user location e Update the user location e Find local to the user services e Find any service that matches with a list of keywords e Register a service Moreover Communities have also a web service interface that enables applications to access them by using SOAP messages In our case we use axis technology 11 as a web service engine SOAP 5 is a lightweight protocol for exchange of information in a decentralized distributed environment It is an XML based protocol that consists of three parts an envelope that defines a framework for describing what is in a message and how to process it a set of encoding rules for expressing instances of application defined datatypes and a convention for representing
19. scription second column and 411 registered to them services fourth column i The uri is necessary in case that the user wishes to have remote access to the community through his own application and that is because of the fact that communities are distributed and can be accessed only by using their url ii Description gives a notion of what kind of services are grouped under the umbrella of the specific community ii The set of services that are registered to the community are links to their wsdl descriptions Users must be aware of the interface of the service that is presented through that description in order to use the service In case of an AXML service the user will be able to call the service by clicking the link DBGlobe IST 2001 32645 Logout Register Your Service Search For A Service Community Keywords Services Actions 192 168 0 6 8001 root all Add Community sport basketball tenis football alymbics contact sport professional basketball American football American football game boxing pugilism fisticuffs touch football professional boxing punch up f 192 166 0 6 8001 spaorts Add Community news NEWS events newspapers good word ff192 1668 0 6 8001 news character reference Add Community character reference Aladdin Meow allusion travel outdoors airlines 192 168 0 6 8001 travel vacations holidays walk Add Community ambulation z E Internet Figure 4 1
20. type we have developed and experimented with a prototype implementation that uses this mechanism To this end we created SpotMe an application that utilizes the idea of communities as this was presented in D14 The general operation and functionality of SpotMe is to enable a user to find out where his friends colleagues partners are what services are offered to him either by his friends partners or others that registered with the DBGlobe system and allow him to advertise post his own services In detail SpotMe aims at providing its users with the following capabilities e Location Management for example find the nearest friend service e Notion of community find services of a given type e Track local to the user services e Find any service based on keywords e Allow users to register their services SpotMe is a context aware application built around web services Context aware application servers are connected with the DBGlobe system by calling the appropriate web services e g CAS web service or Community web service In this way any SpotMe client that enters a DBGlobe covered area can use the SpotMe application as shown in Figure 1 1 DBGlobe IST 2001 32645 Proof of Concept Prototype CAS E SpotMe Server O CoAS SpotMe Client Figure 1 1 Geographical distribution of SpotMe Clients amp Servers In the remainder of this report we provide a detailed description of the communication mod
21. vation etc In this deliverable we provide a description of the proof of concept In particular we will present a prototype implementation of an application that uses the communities that were described in deliverable D14 Executive Summary This report is a product of WP5 and aims at providing a proof of concept prototype for the Location Aware Ad hoc Databases and the Query Processing mechanisms of the DBGlobe framework The DBGlobe framework aims to provide an efficient way of service and data sharing among a variety of mobile devices The goal of this report is to present a proof of concept for the mechanism of ad hoc database creation i e communities and the support of context aware queries as described in the previous deliverable deliverable D14 DBGlobe IST 2001 32645 Proof of Concept Prototype Contents ADSra C si sascctedsasdencsdeseciacawsevevssaacescaeusaunsedseusscausecessesancccceusasesaduseesscassecessessecacceuveuses 2 Executive Summary cassssscadsscessdensassdecessestaawuasevesaadsesdensesscaceoeseteaseasesessacsevansaastaneaeees 2 Pe IMIROOUCHION csee a Aas 4 2 Using the Prototype Application with Communities cccccccsssssssssscccooees 6 3 Implementation USSU Sosseccion oiia a eee aE 9 d User S Manalo E 11 4 1 DBGlobe System Manual 0 0 0 000ccccccccccccccccesccssceseesesssesssseseesseeeeees 11 Credino NCW ACCOMM canis tesa avenue iE E EE E AEE RERESET 12 TOE TOC E a ica cence ee eck Cae
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