mobile context data management framework
DESCRIPTION
TRANSCRIPT
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MOBILE CONTEXT DATA MANAGEMENT FRAMEWORK
The 5th FTRA International Conference on Multimedia and Ubiquitous Engineering (MUE 2011)
David Martin, Carlos Lamsfus, Aurkene Alzua Cooperative Research Centre in Tourism – CICtourGUNE (Spain)
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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1. Introduction
• People on the move are active technology users.
– Worldwide mobile phone sales to end users totalled 1.211 billion units in 2009 (Gartner).
• Mobile devices have become a new way to access information and consume services on the Internet everywhere.
• There is a new challenge in this scenario
– How could we provide the correct information to people on the move at any time and place?
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1. Introduction
Location
Temperature
User Profile
Moving Mode
Social Context
...
Device
¡¡Context Data!!
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1. Introduction
– The development of applications that use context data is not trivial
– Sources of context information have to be identified
– Data has to be gathered from such sources
– Data has to be unified and managed (process, infer new data, store)
– Data has to be served to the applications
– All these complex tasks require new types of software architectures and tools to easily design, develop and test applications by developers.
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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2. Architecture overview
Context Data Manager
Streams{A, B}
Context Provider
Context Data
Source
Mobile Gateway
Context Data
Wrapper
Context Data
Wrapper
Context Data
Wrapper
Context Provider
Context Data
Source
Context Provider
Context Data Manager
Streams{B, C}
Stream C Stream A Stream B
Application
Management
Providers
Sources
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper Visual
Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper Visual
Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Context Provider
– Each provider can send data about one specific context entity type and more than one provider can send data about the same context entity type.
• Proactive: it periodically gets data from the context data source.
• Reactive: it waits until an external event occurs.
– Mobile Context Provider
– Proactive and Reactive
– Built-in Providers • Location: latitude, longitude, altitude.
• Moving mode: none, walking, transportation.
• Social data: other Bluetooth devices near the user.
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper Visual
Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Context Data Wrapper
– It encapsulates raw data in the form of key/value pairs.
– It also encapsulates other provider configuration properties.
– Context entity type
– Provider ID
– ...
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3. Detailed description of the framework
Provider Mobile Device
Context Manager Stream {gps, pulsometer, weather}
Provider Pulsometer
Provider Yahoo Weather
Entity Type: Person Entity Type: Person Entity Type: City
(Id, Loutraki)
(Temperature, 5)
Stream: “weather”
(Id, David)
(Latitude , 5)
(Longitude, 3)
Stream: “gps”
(Id, David)
(Heart rate, 73)
Stream: “pulsometer”
Wrapper
Wrapper
Wrapper
User A
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper Visual
Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Providers ´ Registry
– It manages the life cycle of all the registered providers.
• A communication protocol is used in order to register/unregister a provider.
• It periodically sends messages to the registered providers in order to get a status message from them.
– When the developer unregisters a provider, cancels a stream subscription or the provider is no more longer alive, it automatically deletes all the context data it was providing from the manager.
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3. Detailed description of the framework
– Providers´Registry visual tools
– It has a visual Control Panel in order to subscribe/unsubscribe to a specific context data stream.
– It automatically creates a window per provider showing all of the received data in real time (debugging tool).
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper
Visual Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper
Visual Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Context Data Mapper
– It transforms key/value pairs into Java Bean objects type instances that represent different context entities (Person).
• Automatic Mapper
– It automatically transforms key/value pairs into context entity instances.
• Programmatic Mapper
– The developer implements transformations programmatically.
– It allows more complex data transformations, data base access,...
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3. Detailed description of the framework
– Automatic Mapper
– Java Bean classes that represent context entities have to be marked using annotations provided by the framework.
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper
Visual Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Context Data Aggregator – Data is unified using the specified id.
– It also updates the Context Knowledge Base with up to date data.
– It stores past context in the Context History database.
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3. Detailed description of the framework
Context Data Manager
Context History
Data Base Context Knowledge Base
Rule Engine Query Engine
Providers´ Registry
Context Data Aggregator
Context Data Mapper Factory
Programmatic Mapper
Automatic Mapper
Context Data Mapper
Visual Control Panel
Context Providers´ Layer
Context Entity (Java Bean)
Provider
Status
Context Data
Wrapper
Registration/ Unregistration
Context Data
Wrapper
Applications
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3. Detailed description of the framework
– Context Knowledge Base
– It contains all the context entity instances, which are stored in memory.
• Rule Engine: the developer can provide rules in order to infer high level context from gathered raw data.
• Query Engine: data from the Knowledge Base can be queried using an object oriented query language.
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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4. Validation of the framework
– Mobile tourism service
– It is a push service that sends personalized notifications to mobile devices according to the visitors’ context on a defined area.
Mobile Client Server Side Notification Manager
User Profile Social Context
Location Moving Mode
Time Date
Temperature Other
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4. Validation of the framework
• Transportation Information Scenario
– Tourism entity: bus company.
– Context parameters: location and moving mode (none).
If a visitor is waiting for the bus, the system pushes a notification with an estimation of the remaining time for the bus to arrive.
Bus arrival estimation time
Location = Bus stop Moving mode = “none”
Bus Company
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Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
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5. Benefits of the framework
– The framework provides several improvements compared with mentioned approaches
– Context data life cycle is automatically managed
• Context raw data is automatically transformed into the context model
• Context data is automatically updated
• Providers’ states are taken into account
– Any context data model can be used
– Debugging tools are provided
– Mobility support is provided
– It has a flexible configuration
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
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5. Benefits of the framework
– The framework provides several improvements compared with related work.
– Context data life cycle is automatically managed
– Any context data model can be used
– It can be used with any object oriented context model implemented by the programmer
– Debugging tools are provided
– Mobility support is provided
– It has a flexible configuration
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
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5. Benefits of the framework
– The framework provides several improvements compared with related work.
– Context data life cycle is automatically managed
– Any context data model can be used
– Debugging tools are provided
– Visual debugging tools are provided in order to assist developers in the prototyping stage.
– Mobility support is provided
– It has a flexible configuration
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
![Page 38: Mobile context data management framework](https://reader036.vdocuments.net/reader036/viewer/2022062510/54b4f2b64a7959244d8b47d9/html5/thumbnails/38.jpg)
5. Benefits of the framework
– The framework provides several improvements compared with related work.
– Context data life cycle is automatically managed
– Any context data model can be used
– Debugging tools are provided
– Mobility support is provided
– It has a mobile extension in order to get context data from user’s mobile device.
– It has a flexible configuration
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
![Page 40: Mobile context data management framework](https://reader036.vdocuments.net/reader036/viewer/2022062510/54b4f2b64a7959244d8b47d9/html5/thumbnails/40.jpg)
5. Benefits of the framework
– The framework provides several improvements compared with related work.
– Context data life cycle is automatically managed
– Any context data model can be used
– Debugging tools are provided
– Mobility support is provided
– It has a flexible configuration
– The configuration is based on a publish/subscribe system, that makes the framework easily extensible and adaptable to different application domains.
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SOCAM CoBra
Semantic Spaces
CASS Context Toolkit
CMF
JCAF
5. Benefits of the framework
Hydrogen
![Page 42: Mobile context data management framework](https://reader036.vdocuments.net/reader036/viewer/2022062510/54b4f2b64a7959244d8b47d9/html5/thumbnails/42.jpg)
Index
1. Introduction
2. Architecture overview
3. Detailed description
4. Validation
5. Benefits
6. Conclusions
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6. Conclusions
– The development of contextual computing applications is complex.
– Developers do not have the right tools to easily implement such services.
– Our work
– Developer oriented framework.
– It can enhance the development of applications that adapt and react to the user context.