Facoltà di Ingegneria
Corso di Studi in Ingegneria Informatica
tesi di laurea
Uno strumento per la configurazione
remota di reti di sensori senza filo
Anno Accademico 2008/2009
relatore
prof. Marcello Cinque
candidato
Fabrizio Barbato
matr. 534/001785
Alla mia famiglia
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Introduzione
6
Capitolo 1. Wireless Sensor Network e iCAAS
9
1.1
1.1.1
1.1.2
1.1.3
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
Wireless Sensor Network
Ambiti applicativi
Problematiche di gestione
Monitoraggio sul world wide web: il Sensor Web
iCAAS
Data Access, Sensor networks access e Caching
Filtering
Sessioning
Heterogeneous system accesses
Base di dati di iCAAS: il modello E-R
Capitolo 2. Progettazione strumento di configurazione remota dei sensori senza filo
2.1
2.1.1
2.1.2
2.2
2.3
2.3.1
2.3.2
2.3.3
Analisi dei requisiti
Requisiti funzionali
Requisiti non funzionali
Progettazione architetturale
Progettazione di basso livello
Meccanismi di comunicazione tra client e server
Serializzazione dei dati per lo scambio tra client e server
Persistenza dello stato dell'applicazione
Capitolo 3. Realizzazione dello strumento WSNCT
3.1
3.1.1
3.1.2
3.1.3
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.3
Conclusioni
Bibliografia
Tecnologie utilizzate
Java e il servlet container Apache Tomcat
JSON come formato per lo scambio dati client-server
Persistenza dei dati con Hibernate
Dettagli implementativi
La classe ObjectExtractor per il parsing del json
Le classi di utilità
La servlet Confserv per il salvataggio delle configurazioni sul database
La servlet JsonCreator per la creazione del json
Problematiche riscontrate
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Figura 1.1 - Schema di una rete di sensori
Figura 1.2 - Architettura di una WSN con sistema remoto di ricezione dati
Figura 1.3 - Architettura iCAAS
Figura 1.4 - Modello E-R di iCAAS
Figura 2.1 - Diagramma dei casi d'uso per la configurazione di una rete
Figura 2.2 - Diagramma dei casi d'uso per la configurazione di un sensore
Figura 2.3 - Diagramma dei casi d'uso per la configurazione di una mappa
Figura 2.4 - Diagramma dei casi d'uso per la configurazione di una proprietà
Figura 2.5 - Applicazione a strati
Figura 2.6 - Modello thin e fat client
Figura 2.7 - Architettura client-server three tier
Figura 2.8 - Architettura di WSNCT
Figura 2.9 - Diagramma di seguenza
Figura 2.10 - Struttura database iCAAS
Figura 3.1 - Schema strutturale di un oggetto JSON
Figura 3.2 - Schema strutturale di un array JSON
Figura 3.3 - Tipologie di valori JSON
Figura 3.4 - Architettura di Hibernate
Figura 3.5 - Pattern session-per-conversation
Figura 3.6 - Interfaccia INet
Figura 3.7 - Diagramma classe Net
Figura 3.8 - Interfaccia ITableHome
Figura 3.9 - Diagramma classe TableHome
Figura 3.10 - Diagramma classe NetHome
Figura 3.11 - Diagramma classe ICAASdb
Figura 3.12 - Architettura Middle-thier
Figura 3.13 - Diagramma classe ObjectExtractor
Figura 3.14 - Classi di utilità
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Codice 2.1 – Esempio di una richiesta HTTP
Codice 2.2 – Esempio di una risposta HTTP
Codice 3.1 – Configurazione file web.xml di WSNCT
Codice 3.2 – Costruttore classe ObjectExtractor
Codice 3.3 – Esempio funzione parseAndInitArray
Codice 3.4 – Esempio funzione fillArrays
Codice 3.5 – Estratto n.1 funzione addUadToArrayList
Codice 3.6 – Estratto n.2 funzione addUadToArrayList
Codice 3.7 – Esempio inserimento database
Codice 3.8 – Funzione processNet
Codice 3.9 – Funzione getLastId di NetHome
Codice 3.10 – Esempio ri-modulazione id
Codice 3.11 – Estratto funzione addPropertyToArrayList
Codice 3.12 – Inserimento proprietà nel database
Codice 3.13 – Problematica associazione sensore-proprietà
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2.3.2 Serializzazione dei dati per lo scambio tra client e server
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3.2 Dettagli implementativi
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3.2.1 La classe ObjectExtractor per il parsing del json
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3.2.3 La servlet ConfServ per il salvataggio delle configurazioni sul db
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