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A Web-based Mashup Environment
for On-the-fly Service Composition
2008 IEEE International Symposium on
Service-Oriented System Engineering
Qi Zhao
, Gang Huang
Jiyu Huang , Xuanzhe Liu
Hong Mei
報告者：謝侃呈
Abstract
This paper proposes an on-the-fly approach
to web-based service composition.
We do not distinguish the design-time and
runtime of services and their composition.
We propose a component model for
separating the service business and user
interface.
Introduction
什麼是WBS component?
Many existing work provided web-based
service composition environments, in which
the service business logic and User Interface
(UI) are encapsulatedinto a single component,
called web-based service (WBS) components.
Introduction
Introduction
Given a set of components, qualification
means to check whether the proposed
component satisfies a given set of requirements.
The strict separation between design-time
and run-time brings some serious limitations
on software reuse.
Motivation Scenario
Motivation Scenario
There are three WBS components:
1. A city weather forecast component
2. A Google Map
3. A geo-position detector
The weather map displays 24-hours weather
of the user’s geographical position on the map
Motivation Scenario
Problems：
1. Yahoo Map or Google Map ?
2. The geo-data of detector and
map may be mismatched.
3. Redundant UI elements should be
removed.
Web-based Service Component Model
Web-based Service Component Model
Interface
UI
Programming
Interface
Implementation
View
Model
Controller
The controller
manages
the interaction
logic between
The
view constructs
and
The business logic
of WBS
component:
view.
manages UI elements
The 1)
UI properties
responds to model
users’ and
actions
The model implements business
methods
and 2)
invokes
the corresponding
The controller partlogic
consists
of severala element
controllers.
by invoking
remote service
3) Events
functions
in the implementation
Eachinteract
element
controller
WBS components
with
others encapsulates the interaction
logic ofinterface.
one specific UI element.
by their programming
On-the-fly Service Composition
In our approach, dynamic languages and the no
separation between design-time and run-time
are the most important in design rationales.
On-the-fly Service Composition
I. Retrieving Components
II. Programming Interface
Composition
III. User Interface Composition
I. Retrieving Components
Our WBS component model does not
distinguish between designtime and runtime.
The composition environment is hosted in a
web browser and implemented by JavaScript.
II. Programming Interface Composition
III. User Interface Composition
CONCLUSION
Developers can qualify components and their
composition in a more effective and better
user experience manner.