Systematic Review on Aspect-oriented UML Modeling: A Complete Aspectual UML Modeling Framework
Noorazean Mohd Ali
This study presented a systematic review on Aspect-Oriented Modeling by using UML, which is the popular and well-established modeling language in the industry. Further, the Aspect-Orientation is a complement for Object-Orientation. Thus, it would be natural to investigate the adaptability of UML to Aspect-Orientation. Our research questions focused on investigating the Aspect-Oriented UML (AOUML) approaches based on the literature and for having the benefits of a complete framework for AOUML. The objective of this study was to systematically identify and analyze the Aspect-Oriented Modeling approaches using UML. Therefore, a systematic literature review has been carried out on the existing studies published in the conferences, proceedings and journals. Based on the review, it is evident that the complexity and size systems have grown up, which accumulatively led to the manifestation of new concerns. Moreover, these new concerns that have arrived onboard have cut-cross other concerns and core classes in the system by its nature. Due to this fact, the concept of Advance Separation of Concerns (ASoC) has been put on the table of discussions and the need for an approach to model and represent these crosscutting concerns (Aspect), which is responsible for producing, spreading and tangling representation, throughout the development of life cycle, which is vital and this is considered to be our motivation of systematic review of Aspectual UML modeling. As a result, we have searched the proper databases using the suitable keywords, which match our research questions; we have also collected 468 studies and screened them to minimize the number of studies to 73, which are more appropriate for the present study.
Received: July 28, 2012;
Accepted: October 13, 2012;
Published: February 01, 2013
The needs for the Separation of Concerns (SoC) are in demand during the software
development processes (Magableh and Kasirun, 2007) and
it has received wide spread attention (Dahiya and Sachdeva,
2007). Therefore, a lot of approaches have been proposed and used such as:
Subject-orientation (SO), Feature-orientation (FO) and the most popular Object-orientation
(OO), to represent the concerns of the system (Chitchyan
et al., 2005). Due to the weakness of Object-Oriented Analysis and
Design approach, the proposition in handling the crosscutting concerns (Aspects)
(Uetanabara et al., 2009), Aspect-Orientation
Analysis and design (AOAD) approach has been proposed to focus on the crosscutting
concerns and its effect on multiple classes (Fazal-e-Amin
and Oxley, 2010). In addition, the AOAD is further divided into Aspect-oriented
Requirement Engineering (AORE), Aspect-Oriented Architecture (AOA) and Aspect-Oriented
Design Modeling (AODM). All these fields of AO focus on efficiently handling
the Aspects throughout the software life cycle. However, the most neural field
is the modeling field.
In fact, there are quit a good number of researches have been carried on AODM
as software design process and modelling is considered to be very vital and
important topic (Shen et al., 2011), due to that,
AODM literatures have addressed the modeling of Aspects using different techniques.
Some are based on Architectures View (Katara, 2002),
Aspect-Oriented Language (Groher and Baumgarth, 2004;
Groher and Schulze, 2003), XML representation format
(Suzuki and Yamamoto, 1999), some other are based on
component engineering (Grundy, 2000) and Component Views
(Muller, 2004). Furthermore, the AODM using UML Diagram
is the most well-known technique (Ali et al., 2007a;
Changchien et al., 2002), which has drawn the
attention of a lot of researchers, the AO is considered as an extension to OO
UML is the most accepted design language in Software Engineering, the UML is
considered to be a standard in the industry and it provides a powerful set of
modeling tools and diagrams (Asteasuain et al., 2008).
Thus, the UML for aspect has to be investigated similar to OO. Finally, there
are many propositions on Aspect-Oriented Design Modeling (AODM) using UML approaches.
However, there is a lack of uniform standard (Albunni and
Petridis, 2008; Zhang, 2005). UML with its current
state of the design level is unable to properly model all domains and languages
constructs (Qureshi and Manuel, 2006) as well as it
is unable to represent Aspect-Orientation constructs and the crosscutting nature
of the Aspects (Marco et al., 2008).
Programming and modeling language exist in a relation of mutual support. Thus,
our research focused on button-up technique. It starts from the well-established
aspect coding languages level (AspectJ), which is a hot programming topic nowadays
(Zhang et al., 2009) and moves backward to design
level to generate an Aspect-Oriented UML constructs notation (Aspectual UML).
As there is a lack of Aspectual design notations in AODM for designing Aspect
Oriented code (AspectJ in this case) (Muley et al.,
2010), this would mainly depend on having a look at the coding constructs,
then try to implement it in a representational notation to be used in the design
modeling level. As a result, the level of encapsulation would be increased,
not only at the coding level, but rather at design level too. Concurrently,
the level of consistency would be maintained to high level as all the coding
constructs would be denoted at design phase in the first place (Kande
et al., 2002). This study focused on investigating the Aspect-Oriented
UML (AOUML) approaches based on the literature and for having the benefits of
a complete framework for AOUML.
A SYSTEMATIC REVIEW
This review is based on a structured Systematic Literature Review (SLR) (Ramey
and Rao, 2011). A systematic literature review/mapping refers to the review,
evaluation and interpretation of the all related available research and primary
studies that are relevant to clearly formulated questions, followed by extracting
and analyzing information included in the review (Ramey
and Rao, 2011). SLR is composed of the following steps:
||Systematic Mapping Planning
||Conduction of the search
||Selection of the primary studies and
||Analysis and map building
The four steps and their output artifacts are depicted below in Fig.
Step 1: Systematic mapping plan: Here, the plan that we have used to
conduct the research is executed. It consists of three sub steps:
||Good formulation for the RQ
||Selection of the Databases and Resources and
||The Inclusion Criteria (IC) and Exclusion Criteria (EC)
Research questions: This section explains the research questions used
in this study. The significance of the questions stated below, is nothing but
the signature and the semantics represent all dimensions of our research towards
aspectual UML modeling. Apart of that, some peer-reviewed well established studies
have recommended that such questions scope to be included.
|| Systematic literature review processes
RQ1: What are the Aspect-Orientation UML modeling techniques and approaches
which have been drawn by literature?
RQ2: Does the literature have complete set of UML diagrams extensions
to model Aspect-Orientation?
RQ3: Does the literature have complete Aspect-Orientation modeling framework
based on AspectJ constructs and its language specifications?
RQ4: What are the implication of applying UML 2.4 latest infrastructure
and super structure on Aspect-Orientation modeling?
With respect to RQ1, we are more focused on the existing Aspect modeling techniques
and tools that have been used to model crosscutting in the Software Development.
We have also considered the scope and limitation of a lot of techniques including
the current aspect modeling techniques, in terms of usability, applicability
With respect to RQ2, the literatures have focused on modeling Aspect-orientation
either at early stage of software life cycle or at the later stages, however,
none of the researches have proposed a complete Aspectual framework. For instance,
some studies have proposed an Aspect-Oriented Use Cases (Araujo
and Moreira, 2003), some others have proposed Aspect-Oriented Sequence diagram
(Klein et al., 2007), few more have addressed
the aspect-oriented class diagram (Zhang, 2005; Katara,
2002). However, none of them have proposed a complete set of aspectual UML
diagram. Additionally, even (Ali, 2010) stated that
state chart is among the most important UML diagram, however, only few studied
the adoptability of Aspects into it. Apart of this, none of the researches have
investigated the applicability of using UML timing diagram as instance. Therefore,
this research focused on the applicability of a complete and comprehensive aspectual
UML 2.4 framework, as majority of the researchers have carried their researches
and proposition based on older UML versions.
With respect to RQ3, literatures have focused on reverse engineering approaches.
It starts from bottom-up approach, it investigated the well established aspect
programming languages, then tries to model its constructs and syntax. Some approaches
have proposed and extended AspectJ, however, none of the studies have proposed
a complete set of modeling for all AspectJ language specification for all UML
Since we are focusing on the extended UML 2.4, which is the latest version
of UML (Muller, 2004) that supports Aspect modeling
in AOSD. The Information System Development (ISD) has many methodologies such
as spiral (Kaur et al., 2012) in the field to
address different software development phases (Yusof et
al., 2011), AOSD is one of them, due to that we need to justify the
significance our technique compared to proposals of other studies, more over
we need to rationalize the employment of UML 2.4 compared with other versions
of UML and ultimately elucidate the goals, aims and contributions that could
be achieved by our modeling. The RQ4 is more concerned about such in AOSD.
Selection of the Databases and Resources (Search Process): In this step
we have tried to find out the databases and resources that we are going to use.
The selection of the databases usually depends on the following three criteria:
||Content update (the sources are always up to date with the
||The availability of the full text of the papers and
||The Quality of research accuracy and preciseness is taken in the consideration
The Table 1 shows the Electronic Databases and Resources
used in this systematic review. These databases are the most popular, standardized,
well-established and most relevant to the Aspect-oriented modelling.
The Inclusion criteria (IC) and exclusion criteria (EC): IC and EC are
considered as important elements of the Systematic Review (Ramey
and Rao, 2011). These criteria helps us in including the primary studies
that shows relevancy to the research questions and exclude the studies, which
do not have relevancy to answer the research questions. Table
2 shows the EC and Table 3 shows the IC.
|| Electronic databases and resources
Step 2: Conducting the search: This step is divided into two sub steps:
||Choosing Key words and
||Search strings in databases. By approaching the end of the conducting
the search (step 2)
We will come out with the final edition of the primary related studies, using
the proper keywords, with the database related string searching format.
Choosing key words: The keywords have been chosen carefully. It must
be simple and meaningful enough to cover up all the primary studies, which can
bring back more accurate results in the searched databases. The selected keywords
of our research were shown previously in the keywords section.
|| Exclusion criteria created for systematic mapping
|| Inclusion criteria created for systematic mapping
Search strings in databases: Every database search engine has its own
strings settings, as everyone has its special format. Generally, the strings
used to search the proper databases have to compose from AND/OR connections,
as shown below:
||(UML AND (Aspects OR Aspect Modelling OR Aspectual OR AODS))
||(Aspect AND (Modelling OR Representation OR Capturing OR UML))
Step 3: Selection of the primary studies: As a result of applying the
above keywords (Step 2) on the listed data sources (Step 1), we have identified
that the total number of primary studies are 468. Furthermore, we have extracted
the proper direct related studies, by removing the duplication and redundancies
and by reading the abstract of the articles and the full text. As a result,
we got 73 primary studies related to our topic as shown in Table
3. The qualitative focused studies are selected based on the systematic
review approaches rules and conditions (Ramey and Rao, 2011).
Additionally, 9 out of the 14 primary related studies have been taken from latest
peer-reviewed conference/journals. Table 4 describes the screening
of articles in numbers and total number of included study for each research
questions. Figure 2 shows the screening process used for our
Figure 3 shows the trend of screening process. Initially,
we had a huge number of articles and then they have been reduced by screening
the articles till we get the primary studies. Figure 4 illustrates
an idea about the studies in terms of year distribution; we have observed that
Aspect-Oriented UML study have started at the end of 1990 sec.
|| The screening and selection process
|| Articles screening in numbers
|| Trend of articles screening process
|| Year-wise distribution
We have identified that there are quite good number of researches have been
carried out. Since 2006, the number has started increasing gradually. This gives
us an indication that the field of the study was not stable and has not been
standardized yet and the rooms are open for researchers.
Step 4: Analysis and build mapping: Figure 5 depicts
the connection between the study areas of our research. Initially, Software
Analysis and Design approaches are divided into Object-Orientation (Letherbirdge
and Laganiere, 2001), Subject-Orientation (Ossher and
Tarr, 1999), feature-Orientation (Cohen et al.,
1992) and Aspect-Orientation, which is divided into Aspect-Oriented Requirement
Engineering (AORE), Aspect-Oriented Architecture (Bass et
al., 1998; Shaw and Garlan, 1996) and Aspect-Oriented
Design Modeling (AODM), which specify the behavior and structure of the software
Our work has focused on AODM. In fact, AODM is concerned with representing
and capturing the dynamic and static view of aspects and characteristics of
aspects from the early stage of software life cycle. As a result, a lot of researchers
came out with different kinds of modeling methods and techniques such as: Theme/UML
(Clarke and Baniassad, 2005), SUP (Omar
et al., 2002), Cocompose (Dennis and Bergmans,
2002), Aspect at Design Time (ADT) (Jose et al.,
2000) and Aspect-Oriented UML Diagrams modeling, which is the focus of our
In reality, there are a lot of Aspect-Oriented UML modeling (AOUML) approaches,
however, only few of them have come of age and have been presented at acknowledged
conferences and journals. The AOUML approaches are categorized into two general
categories. The first category is called constructing/building UML profile.
Basically, constructing UML profile extension is usually called as light-weight
extension, because all the existing UML profile extension techniques do not
implement any new UML Meta-model elements. Also, the constructing UML profile
extension techniques are usually considered to be predefined set of constraints,
tagged values, graphical representations and stereotypes (Elminir
et al., 2011). Thus, constructing UML profile extension method supplement
the aspect based on the flexibility and extendibility nature of the standard
UML domain modeling (Przybylek, 2010). The second category
is UML Meta Model Extension. It refers to the Meta Model of basic rules and
principles used to construct the domain conceptual models, it is considered
as model of a modeling language. Also, this category is considered to be a heavy-weight
extension, as it does proposes new UML Meta model to represent aspects and its
crosscutting nature (Rui et al., 2009).
The major difficulty in comparing and critically analyzing AOM approaches and
their benefits of modeling framework, is the lack of a common understanding
for the basic ingredients of aspect-oriented modeling, Fig. 6
shows the criteria that we are based on and compared against.
Criteria categories: Here, the description of the criteria used to compare
the AOUML selected modeling approaches. The motivation behind the selection
of these criteria is that, to show the gaps in the knowledge and how our work
will fill in such gaps by answering the research questions. Thereby, clearly
stating the methodology used for assembling the criteria catalog and defining
a common description schema.
|| Connection between the studys areas
|| Criteria categories
The methodological justification behind criteria design and assembly is to
provide a prerequisite for a comprehensive analysis of existing AOUML approaches
and thus allows comparing different AOUML Modeling approaches in greater detail.
However, no measurable criteria have been excluded. Moreover, criteria with
an ambiguous definition and/or no appropriate means of measurement are also
excluded as well as criteria that does not meet a standard guideline has been
excluded (Shukur and Mohamed, 2008). Clear catalogues
for these criteria are briefly elaborated in the next sections. An abbreviation
has been added to each one of them:
||Language Specification (LS): This category describes
some criteria related to the modeling language. The UML Modeling Language
Version (UMLMLV), Extension Mechanism (EM), Language Purpose (LP), Platform
Dependency (PD), Diagram Type (DT), Modeling Process (MP) this obtained
from (Wimmer et al., 2011), Traceability (T)
and Adoptability (A)
||AspectJ constructs/syntax (AJC): This catalogue contains vital
criteria, as we are going to study full list of AspectJ constructs-most
used and well-established AspectJ language in the industry-to perform a
reverse engineering (button-up). This would increase the consistency, level
of understanding and the smooth transition from one stage to another (Kande
et al., 2002). The criteria have been inspired from (Laddad,
2002). The following are the criteria: Dynamic Crosscutting Support
(DCS), Static Crosscutting Support (SCS), Join Points Types (JPT), Pointcut
Types (PCT) and Advice Types (AT)
||Maturity Issues (MI): This catalogue investigates the maturity
of the approach proposed, in fact, many approaches have been proposed, but
this study will focus only few of them, which we believe are well-established
and have gained good reputation among researchers (Wimmer
et al., 2011). It is divided into Modeling Examples (ME), Application
in Real-World Projects (ARWP) and Usability (U)
||Tool Support (TS): This catalogue category has highlighted some
criteria that have concentrated on a tool support for any proposed research.
It has been divided into Modeling Support (MS), Code Generation (CG) and
Model Kernel Extraction (MKE)
||Real example illustration (REI): This catalogue considers the applicability
and reality of the demonstrated example used by the author. It is dived
into Used Example (UE). Complexity (C)
||Complete framework support (CFS): This category highlights a composition
of other categories. We call a proposition as a complete framework if it
does capture all the AspectJ constructs, all UML diagrams 2.4 (not only
few) and has a comprehensive tool support for auto AspectJ generation and
model kernel file extraction
Aspect-oriented UML modeling approaches: Aspect-oriented UML modeling
approaches is categorized into two general categories. The first category is
called constructing/building UML profile. Basically, constructing UML profile
extension is called as light-weight extension, because all the current existing
propositions constructing UML profile extension techniques, do not implement
any new UML Meta-model elements. Also, constructing UML profile extension techniques
are usually considered to be a predefined set of constraints, tagged values,
graphical representations and stereotypes. Thus, constructing UML profile extension
method supplement the aspect based on the flexibility and extendibility nature
of the standard UML domain modeling (Przybylek, 2010).
The second category is UML Meta Model Extension. It refers to the Meta Model
of basic rules and principles use to construct the domain conceptual models,
it is considered as model of a modeling language. Also, this category is considered
to be a heavy-weight extension, as it does proposes new UML Meta model to represent
aspects and its crosscutting nature (Rui et al.,
2009). The literature of AOUML modeling shows that, there are fourteen approaches,
where they are considered mature enough and well-established.
The Aspect-oriented Component Engineering (AOCE) focuses on recognizing a mixture
of slices or aspects of an overall system (Grundy, 2000).
A component provides services to, or services it uses from other components.
Aspects are horizontal segments through a system, which basically affect many
other components identified, by the process of decomposition, such as persistence
and distribution. Developers use aspects to describe different perspectives
on component capabilities during requirements engineering and design. The AOCE
proposes representation for Aspect and aspects details. It provides a new framework
for describing and reasoning about component capabilities from multiple perspectives.
In literature (Ho et al., 2002), UML All Purpose
Transformer (UMLAUT) toolkit is another use for the MOF mechanism. It is an
aspect oriented UML models used for easily building specific weavers for producing
detailed design models from high level. It enables the developer to program
the weavers at the level of UML Meta mode. The UMLAUT provides the user with
a general purpose operator that can be extended and as well as reused for different
application with specific demands. Each AO design may be developed with an application
specific weaver that optimizes the weaving process demonstrated by UMLAUT.
Stein et al. (2002) considered to be one of
the light-weight UML extensions. It has been developed as a design notation
for AspectJ, it extends the existing UML standard notations. It comes with a
new production AspectJ weaving process.
Theme/UML is used to produce separate design models for each theme
elicited from the requirements phase and then it does encapsulate the concern
representing some kind of functionality in a system (Clarke
and Baniassad, 2005). The Theme/UML is considered to be a heavy-weight extension
of the UML metamodel version, as it does add some new element to the standard
representation. Basically, the Theme/UML poses no restrictions on the UML diagrams
that might be used for modeling. Nevertheless, package and class diagrams are
specifically used for structure modeling and sequence diagrams are used for
Elrad et al. (2005) aims to model aspect independently
from the existing types of the Aspect-Oriented programming languages. The Class
diagrams are used to express the structural dependencies and state the machines
model and the behavioral dependencies of concerns. The approach provides a guideline
on how to refine the modeling continually from class diagram to the state of
Jacobson and Ng (2005), used case driven software development
method has been realized by extending the UML 2.0 metamodel. Aspect-Oriented
Software Development with Use Cases (AOSD/UC) comes with a systematic process
that focuses on the separation of concerns throughout the software development
life cycle, that is, from requirements engineering with use cases down to the
implementation phase. For the design phase, component diagrams can be refined
into class diagrams, while sequence diagrams are used to model behavioral features.
Concerns are modeled using a use case slices stereotype and the approach does
not come with any support tools as majority of the existing approaches are depending
on the existing tools such as Rational Rose (Ali et al.,
2007b) and MagicDraw which they do not provide the option to represent crosscutting
concerns (aspects) efficiently as well as There are many Computer-Aided Software
Engineering (CASE) Tools for visual developing class diagrams in 2D and 3 D
(Sanatnama and Brahimi, 2010) which do not consider
Aspects as well.
Pawlak et al. (2005) proposed a mix mode mechanism,
where it makes use of the UML profile extension and UML ability to be extended
to model different domain models as well as UML Meta object Facility model mechanism,
by proposing new Meta object/notation. It proposes a Java Aspect Component (JAC),
which is a platform dependent. This JAC comes with a new UML notations and an
implementation to it as well. It does support for all steps of development for
Aspect-Orientation from its design, to its implementation ending with the deployment.
This approach uses the UML profile mechanism to design aspects by adding stereotypes
to qualify classes implementing aspects and non functional concerns.
Aspect-oriented Class Design Model consists of a set of aspect models and a
primary model (Reddy et al., 2006). Each aspect
model describes a feature that crosscuts elements in the primary model. The
aspect and primary models are composed to obtain an integrated design view.
It describes a composition approach that utilizes a composition algorithm and
composition directives. Composition directives are used when the default composition
algorithm is known or expected to yield incorrect models. Its prototype tool
supports default class diagram composition.
Coelho and Murphy (2006) presented crosscutting structure
usually is done using two ways:
||Tree views, which involves developers in combining information
across multiple views manually and
||Static structure diagrams, which be likely suffer from extreme graphical
An active model is an approach that attends to these problems by presenting
the right crosscutting structure at the proper time. The right information
is determined through automatic projection and abstraction operations that select
elements and relationships likely to be of interest and that abstract those
elements and relationships to control the diagram complexity when too many similar
cases occur. The information is presented at the right time through a combination
of a user-driven expansion operation that adds detail to the model and interaction
features that show some information only on demand by the user.
Cottenier et al. (2007) introduced a new join
point selection mechanism based on state machine specifications. The interfaces
of a system include a specification of the effects of method invocations on
the state of the module instance. This specification is not defined with respect
to potential aspects, but unambiguously describes the observable behavior of
the module. We have shown how a smart join point selection mechanism is able
to infer points that might be located deep inside the implementation of a module,
given pointcut that are expressed entirely in terms of its specification element.
It refines the class diagram and the composite structure to capture the static
structure of the system. It uses the state machine extension to represent the
behaviors of the system.
Katara and Katz (2007) concerned architecture used
to group aspect designs and can be seen as a software architecture viewpoint.
The concern architecture model provides an aspect-oriented perspective on software
design. The model can also be seen as an aspect analysis viewpoint for analyzing
impacts of changes or trade-offs in concerns to be addressed by aspects. It
adds some new stereotypes to model aspects such as <<Aspects>>,<<Concerns>>,
<<Bind>>, <<replace>> and <<Unify>>.
Klein et al. (2007) proposed an Aspect-oriented
UML approach using the standard UML. It did not propose any new notation as
well as, it did not use the UML extension ability believing in keeping the standardization
as it is not changed. It is originally based on Message Sequence Charts (MSC)
a standardized scenario language. It uses UML 2.0 sequence diagram. Indeed,
no extensions to the UML Sequence diagram have been made; relatively a simplified
Meta model for Sequence diagram has been designed, where conformity with the
original UML Sequence diagram is accomplished through model transformation in
the supplementary tool support.
Sharafi et al. (2010) presented an extension
to the UML metamodel to explicitly capture the crosscutting concerns. It proposes
an independent way from any programming language and cross platform. The newly
created metamodel can be represented in standard XMI format, it does not have
its own tool to draw the modeling; it uses the existing CASE tools to read this
XML format. This language-independent aspectual description can support model
transformations vital to software development and maintenance, such as forward
engineering, reverse engineering and reengineering.
Aspect-oriented UML Modeling proposed an extension establishing a new package
called AoUML, which consists of elements to represent the primary AO concepts
such as aspect, advice, pointcut, parent declaration, introduction and crosscutting
dependency (Przybylek, 2010). It also proposes reuse
elements from the UML 2.1.2 infrastructure and superstructure specifications.
RESEARCH FINDINGS RESULTS
After applying the systematic review based on our RQ, we have compared the
critical points and determined the mature approaches; we have illustrated our
findings in the tabulated forms. The table lists all approaches (rows) and the
criteria we are examining (columns). Each table comes with its index (legend)
to elaborate the meaning of each abbreviation.
Table 5 illustrates the comparison between the selected approaches
based on the language specific criteria. We have identified that none of the
proposed approaches have used UML 2.4 and none of them was focusing on all UML
diagrams, however, majority were focusing on class diagram (Structural modeling).
Also, majority of the approaches did not propose any modeling procedure. Moreover,
most of the approaches are neither tractable nor adoptable. While Table
6 shows that majority of the approaches have demonstrated their work with
only a modeling example, few of them used a real life example demonstration,
which makes only few of them usable.
Table 7 and 8 indicate that only few researches
have demonstrated a complex demonstration example, some of them used a depreciated
example such as, the compositor example, which is a well-known example for crosscutting
representation. While Table 8 shows that none of the proposed
approaches are consider as a complete framework, as none of them have proposed
an extension to all UML language, apart from not using the latest UML edition.
Moreover, none of them have provided a tool with the ability to generate AspectJ
code, as well as model kernel extraction, at the same time none used to mode
all AspectJ constructs.
Table 9 shows that, only few approaches have their own tool,
the rest used an already implemented tool. And even those who proposed a tool
did not work on having AspectJ code generator as well as Model extractor.
|| Language criteria
|UMLMLV: UML modelling language version, EM: Extension mechanism,
LP: Language purpose, PD: Platform dependency, DT: Diagram type, MP: Modelling
process, T: Traceability, Y: Yes, N: No, C.D: Class diagram, P.D: Package
diagram, P: Partial support, CO.D: Component diagram, U.C: Use case, COMM.D:
Communication D, ST.D: State diagram, A: Adoptability, S.D: Sequence diagram,
S: Specific, CLL.D: Collaboration D
|| Maturity criteria
|ARWP: Application in Real-World projects, ME: Modeling examples,
U: Usability, Y: Yes, N: No
|| Real example
|C: Complexity, UE: Used example, Y: Yes, N: No
|| Complete framework
|CFS: Complete framework support, N: No
The Table 10 clearly shows that none of the approaches have
taken the full support for AspectJ constructs into consideration, some have
proposed a static representation for the pointcut some more have proposed dynamic
approaches, however, none has represented as per the AspectJ. Finally, some
have provided partial support for join point and advice type and none has presented
all types of the join points and advice.
|| Tools support
|MS: Modelling support, CG: Code generation, MKE: Model kernel
extraction, Y: Yes, N: No
|| AspectJ constructs
|DCS: Dynamic crosscutting support, SCS: Static crosscutting
support, JPT: Join points types, PCT: Pointcut type, AT: Advice type, N:
No, Y: Yes, P: Partial support
The results administrated below have answered the research questions that we
were focusing on. The RQ1 has focused on existing approaches; in the context
we have investigated the well-established elicited approaches. The RQ2 talks
about having a complete set of UML diagrams to model Aspects, based on the investigations
we have proved that none of the existing approaches got a complete set of aspectual
UML diagrams. The RQ3 focuses about modeling all AspectJ constructs and consequently,
we have proved that, none of the existing modeling approaches have come out
with modeling notations for all AspectJ. The RQ4 focuses about the usability
of UML 2.4 in modeling aspect orientation. This question of systematical survey
has been answered by depicting that, none have used the latest UML edition for
modeling and none have investigated the infrastructure and the superstructure
of the latest UML edition.
As a future work, the ability of adopt Aspects modelling in the learning objects
and e-Learning will be investigated due to the fact that e-Learning is becoming
a major component in academia today (Jayanthi et al.,
2007). Our future work is to provide a complete set of modelling notations
consist of all UML diagrams to represent and model all AspectJ. To evaluate
our modelling we will use different kind of evaluation techniques, we will try
to study the ability to evaluate the AO using the metrics which has been used
in object orientation (Parthasarathy and Anbazhagan, 2006)
to come up with a reliable model as Reliability is one of the major concerns
for software engineers (Chen et al., 2011).
After brain storming discussions, we had identified that almost all primary
articles have similarities in their objectives and all of them are heading towards
addressing and modeling the crosscutting concerns (Aspects) using UML, which
is the focus of RQ1. Furthermore, majority of the studies were focused on extending
the current UML model and make use of the extendibility feature of UML. Only
few researches had proposed their own notations and extensions. The majority
of the researches were focusing on one or two diagrams of the UML; none of them
were addressing a complete framework. Moreover, majority of them were not providing
tools for their propositions, they depend on the existing tool. Further, all
the researchers had focused on the older versions UML than the current UML edition,
which is UML 2.4. Moreover, none of the studies have focused on the new Infrastructure
specification and the Superstructure specification of the adaptability and compatibility
of UML 2.4 with the proposed model. We believe that Aspect-Oriented programming
should be extended to the entire software development. Each aspect of the implementation
should be declared during the design phase, so that there will be a clear traceability
from requirements through source code.
This study has been funded by the Faculty of Computer Science and Information
Technology in University National Malaysia (UKM). This Aspect-oriented systematical
review has inspired us and opened some new avenues for research. We are currently
carrying on the research and have started on creating Aspectual UML 2.4 Modeling
Approach, using the bottom up technique, to capture and represent all the crosscutting
concerns (Aspect) constructs and elements including AspectJ as a base for the
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