Aspectj in Action, Second Edition
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A Brief Introduction to Aspect-Oriented Programming
R R R A Brief Introduction to Aspect-Oriented Programming" R R Historical View Of Languages" R •# Procedural language" •# Functional language" •# Object-Oriented language" 1 R R Acknowledgements" R •# Zhenxiao Yang" •# Gregor Kiczales" •# Eclipse website for AspectJ (www.eclipse.org/aspectj) " R R Procedural Language" R •# Also termed imperative language" •# Describe" –#An explicit sequence of steps to follow to produce a result" •# Examples: Basic, Pascal, C, Fortran" 2 R R Functional Language" R •# Describe everything as a function (e.g., data, operations)" •# (+ 3 4); (add (prod 4 5) 3)" •# Examples" –# LISP, Scheme, ML, Haskell" R R Logical Language" R •# Also termed declarative language" •# Establish causal relationships between terms" –#Conclusion :- Conditions" –#Read as: If Conditions then Conclusion" •# Examples: Prolog, Parlog" 3 R R Object-Oriented Programming" R •# Describe " –#A set of user-defined objects " –#And communications among them to produce a (user-defined) result" •# Basic features" –#Encapsulation" –#Inheritance" –#Polymorphism " R R OOP (cont$d)" R •# Example languages" –#First OOP language: SIMULA-67 (1970)" –#Smalltalk, C++, Java" –#Many other:" •# Ada, Object Pascal, Objective C, DRAGOON, BETA, Emerald, POOL, Eiffel, Self, Oblog, ESP, POLKA, Loops, Perl, VB" •# Are OOP languages procedural? " 4 R R We Need More" R •# Major advantage of OOP" –# Modular structure" •# Potential problems with OOP" –# Issues distributed in different modules result in tangled code." –# Example: error logging, failure handling, performance -
Weaving Ontology Aspects Using a Catalog of Structural Ontology Design Patterns
Weaving Ontology Aspects Using a Catalog of Structural Ontology Design Patterns Ralph Schäfermeier and Adrian Paschke Corporate Semantic Web Group, Institute of Computer Science, Freie Universität Berlin, Germany {schaef,paschke}@inf.fu-berlin.de http://www.csw.inf.fu-berlin.de Abstract. Modular development of ontologies proves beneficial at dif- ferent stages of the ontology lifecycle. In our previous work, we proposed aspect-oriented ontology development as a flexible approach to modular ontology development and a-posteriori modularization of existing mono- lithic ontologies, inspired by aspect-oriented programming and based on so called cross-cutting concerns. Similar to other formalisms for mod- ular ontologies (e.g. E-Connections), aspect-oriented ontologies rely on an extension of the used ontology language. This derivation from the standard in turn requires specially adapted tools in order to use these ontologies in applications. In this paper, we present an approach to the recombination of aspect-oriented ontology modules to standard OWL 2 ontologies by using an aspect-weaving service. The weaving service relies on a preconfigured catalog of structural ontology design patterns. We show that the use of the weaving service yields syntactically correct and semantically complete ontologies while still allowing ontology developers to fully benefit from modular ontology development. Keywords: Aspect-Oriented Ontology Development, Aspect-Oriented Programming, Ontology Modularization, Ontology Design Patterns 1 Introduction Modular ontology development has proved beneficial when it comes to improve- ment of reasoning and query result retrieval performance, scalability for ontol- ogy evolution and maintenance, complexity management, amelioration of un- derstandability, reuse, context-awareness, and personalization [17]. A significant amount of research work has been dedicated in the field of ontology modular- ization, and various kinds of approaches tackle the problem from different per- spectives. -
Annotation File Format Specification
Annotation File Format Specification https://checkerframework.org/annotation-file-utilities/ September 1, 2021 Contents 1 Purpose: External storage of annotations 1 2 Grammar 2 2.1 Grammar conventions . 2 2.2 Java file grammar . 2 2.2.1 Package definitions . 3 2.2.2 Class definitions . 3 2.2.3 Field definitions . 5 2.2.4 Method definitions . 5 2.3 Bytecode Locations . 6 2.3.1 Bytecode offsets . 7 2.3.2 Source code indexes . 7 2.3.3 Code locations grammar . 7 2.3.4 AST paths . 9 2.4 Annotations . 15 2.4.1 Annotation definitions . 15 2.4.2 Annotation uses . 15 3 Example 17 4 Types and values 17 5 Alternative formats 19 1 Purpose: External storage of annotations Java annotations are meta-data about Java program elements, as in \@Deprecated class Date f ... g". Ordinarily, Java annotations are written in the source code of a .java Java source file. When javac compiles the source code, it inserts the annotations in the resulting .class file (as \attributes"). Sometimes, it is convenient to specify the annotations outside the source code or the .class file. • When source code is not available, a textual file provides a format for writing and storing annotations that is much easier to read and modify than a .class file. Even if the eventual purpose is to insert the annotations in the .class file, the annotations must be specified in some textual format first. • Even when source code is available, sometimes it should not be changed, yet annotations must be stored somewhere for use by tools. -
Aspect-Oriented Software Development for Real-Time and Internet Applications
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 09 | Sep 2018 www.irjet.net p-ISSN: 2395-0072 Aspect-Oriented Software Development for Real-Time and Internet Applications Ogbonna J. C.1, Nwokoma F. O.2, Nwala K. T.3, Nwandu I. C.4 1,3Reseacher, Dept. of Computer Science, Clifford University Owerrinta, Abia State Nigeria 2,4Reseacher, Dept. of Computer Science, Federal University of Technology Owerri, Imo State Nigeria ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Software development evolution has introduced and increasing the reusability of a software product, which a number of useful software development methods. Efficient in turns results in better software development. modularization of program artifacts that cut across multiple AOP is based on the idea that computer systems are better locations during software development called crosscutting programmed by separately specifying the various concerns concerns have been a major drawback for these software (properties or areas of interest) of a system and some development methods including the almighty Object-Oriented description of their relationships, and then relying on Software Development method. Concerns like recovery, mechanisms in the underlying AOP environment to weave or synchronization, logging, encryption, authentication, compose them together into a coherent program (Elrad, authorization, validation, verification, -
Model-Based Aspect Weaver Construction
Model-based Aspect Weaver Construction Suman Roychoudhury1, Frédéric Jouault2,1, and Jeff Gray1 1 University of Alabama at Birmingham, Birmingham, AL 35294 {roychous, gray}@cis.uab.edu 2 ATLAS group (INRIA & LINA), University of Nantes, France [email protected] Abstract. This paper describes an approach that combines model engineering with program transformation techniques to construct aspect weavers for general-purpose programming languages. The front-end of the weaver uses a high-level language (i.e., an aspect language) to specify aspects and is designed with a metamodel-based approach using the AMMA toolsuite. The back-end of the weaver uses transformation rules, which are generated from these high-level aspect specifications, to perform the actual low-level weaving. Both the aspect specification (front-end) and transformation rules (back-end) are captured as models within the AMMA platform. The translation from source aspect model to target transformation model is achieved using ATL, which is a model transformation language. Keywords: model transformation, program transformation, model engineering, aspect-oriented-programming, software engineering. 1 Introduction Program transformation systems have been used in the past to construct aspect weavers for programming languages [1]. Program transformation engines (PTEs) such as the Design Maintenance System (DMS) [2], or ASF+SDF [3], provide direct availability of scalable parsers and an underlying low-level transformation framework to modify source programs. This low-level transformation framework (that generally uses term-rewriting or graph-rewriting techniques to modify base code) can form the basis of constructing aspect weavers [4]. In our previous research, we demonstrated how a term-rewriting PTE like DMS can be used to construct an aspect weaver for a general-purpose programming language (GPL) like ObjectPascal [1]. -
Advanced-Java.Pdf
Advanced java i Advanced java Advanced java ii Contents 1 How to create and destroy objects 1 1.1 Introduction......................................................1 1.2 Instance Construction.................................................1 1.2.1 Implicit (Generated) Constructor.......................................1 1.2.2 Constructors without Arguments.......................................1 1.2.3 Constructors with Arguments........................................2 1.2.4 Initialization Blocks.............................................2 1.2.5 Construction guarantee............................................3 1.2.6 Visibility...................................................4 1.2.7 Garbage collection..............................................4 1.2.8 Finalizers...................................................5 1.3 Static initialization..................................................5 1.4 Construction Patterns.................................................5 1.4.1 Singleton...................................................6 1.4.2 Utility/Helper Class.............................................7 1.4.3 Factory....................................................7 1.4.4 Dependency Injection............................................8 1.5 Download the Source Code..............................................9 1.6 What’s next......................................................9 2 Using methods common to all objects 10 2.1 Introduction...................................................... 10 2.2 Methods equals and hashCode........................................... -
Inversion of Control in Spring – Using Annotation
Inversion of Control in Spring – Using Annotation In this chapter, we will configure Spring beans and the Dependency Injection using annotations. Spring provides support for annotation-based container configuration. We will go through bean management using stereotypical annotations and bean scope using annotations. We will then take a look at an annotation called @Required, which allows us to specify which dependencies are actually required. We will also see annotation-based dependency injections and life cycle annotations. We will use the autowired annotation to wire up dependencies in the same way as we did using XML in the previous chapter. You will then learn how to add dependencies by type and by name. We will also use qualifier to narrow down Dependency Injections. We will also understand how to perform Java-based configuration in Spring. We will then try to listen to and publish events in Spring. We will also see how to reference beans using Spring Expression Language (SpEL), invoke methods using SpEL, and use operators with SpEL. We will then discuss regular expressions using SpEL. Spring provides text message and internationalization, which we will learn to implement in our application. Here's a list of the topics covered in this chapter: • Container configuration using annotations • Java-based configuration in Spring • Event handling in Spring • Text message and internationalization [ 1 ] Inversion of Control in Spring – Using Annotation Container configuration using annotation Container configuration using Spring XML sometimes raises the possibility of delays in application development and maintenance due to size and complexity. To solve this issue, the Spring Framework supports container configuration using annotations without the need of a separate XML definition. -
Type Annotations Specification
Type Annotations Specification (JSR 308) Michael D. Ernst [email protected] May 2, 2013 The JSR 308 webpage is http://types.cs.washington.edu/jsr308/. It contains the latest version of this document, along with other information such as a FAQ, the reference implementation, and sample annotation processors. Contents 1 Introduction 2 2 Java language syntax extensions 2 2.1 Source locations for annotations on types . 2 2.1.1 Implicit type uses are not annotatable . 5 2.1.2 Not all type names are annotatable . 5 2.2 Java language grammar changes . 6 2.2.1 Syntax of array annotations . 8 2.2.2 Syntax of annotations on qualified types . 9 2.3 Target meta-annotations for type annotations . 9 3 Class file format extensions 11 3.1 The type annotation structure . 12 3.2 The target type field: the type of annotated element . 13 3.3 The target info field: identifying a program element . 13 3.3.1 Type parameters . 13 3.3.2 Class supertypes: extends and implements clauses . 14 3.3.3 Type parameter bounds . 14 3.3.4 Method return type, receiver, and fields . 15 3.3.5 Method formal parameters . 15 3.3.6 throws clauses . 15 3.3.7 Local variables and resource variables . 15 3.3.8 Exception parameters (catch clauses) . 16 3.3.9 Type tests, object creation, and method/constructor references . 16 3.3.10 Casts and type arguments to constructor/method invocation/references . 16 3.4 The type path structure: Identifying part of a compound type . 17 A Examples of classfile structure 18 A.1 Examples of type parameter bounds . -
Java Class Annotation Example
Java Class Annotation Example Bud etherealizing her matriarch inimitably, unwavering and decayed. Antimonious and regulation Rog violated almost anywhere, though Saunderson tosses his Creon outdating. Which Roland disinhuming so ordinarily that Westleigh tooth her opposites? It is class to classes are pretty easy to reflection to list to catch, company or property to generate mock for? First method of java example. The java are given list of bibliography. Default annotations example, java code examples of the compiler to be applied to json. The new project for extracting information to create web sites without editions but i go into the annotated bibliography paper, we welcome to isolate the mechanics of using. Parsing the examples can be used from open source and. We will utilize the class analyzes the same type declaration etc at runtime reflection methods or evaluative lists the suite itself which are. Nice explanation about the front controller, we added and then issues a class of the information, management example demonstrates how can be executed and. There are working standalone spring boot application into system proposed here, because of annotations. Its annotations example annotation examples java. Hibernate does not to class or specify java example of fundamental never hurt or not. Read from java class acts as each article has been designed with examples select then we learned about? We made as classes that class or examples of annotation example classes or an earlier article example it tells spring. The table pointing back to interface. From java example is applied only contains a second argument. Junit provides a test cases, we want specific warnings and ideas into our newsletter for an understanding takt time in. -
Static and Dynamic Approaches to Weaving
5th Slovakian-Hungarian Joint Symposium on Applied Machine Intelligence and Informatics January 25-26, 2007 ░ Poprad, Slovakia Static and Dynamic Approaches to Weaving Michal Forgáč, Ján Kollár Department of Computers and Informatics, Faculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia [email protected], [email protected] Abstract: In this paper we present current state of principles and applications in static and dynamic weaving. We are concentrating on static weaving in AspectJ and dynamic weaving in PROSE - PROgrammable extenSions of sErvice. The contribution of this paper is in analyses of both approaches to weaving which we aim to apply as essential mechanisms when constructing software systems by automatic evolution. Keywords: Aspect oriented programming, systems engineering, weaving mechanisms, AspectJ, PROSE1 1 Introduction As a complexity of software systems grows, the need for advanced methods and tools of their specification and the development is the task of the high importance. Object oriented programming (OOP) has increased the productivity of systems rapidly. Benefits of object orientation include support for modular design, code sharing, and extensibility [15]. Object orientation has enabled using inheritance and polymorphism in sence of Strachey's original definition of polymorphism [16]. However, the key issue in application of object approach is that it is not sufficient for crosscutting concerns. One of the fundamental principles of the software engineering is a principle of separation of concerns. A concern is a particular goal, concept, or area of interest, it means that it is in substance semantical concern. From the structural point of view a concern may appear in source code as [4]: This work has been supported by the Scientific grant agency project (VEGA) No. -
Efficient Runtime Aspect Weaving for Java Applications
Efficient Runtime Aspect Weaving for Java Applications Oscar Rodriguez-Prietoa, Francisco Ortina,∗, Donna O'Sheab aUniversity of Oviedo, Computer Science Department, Calvo Sotelo s/n, 33007, Oviedo, Spain bCork Institute of Technology, Department of Computer Science, Rossa Avenue, Bishopstown, Cork, Ireland Abstract Context: The aspect-oriented paradigm is aimed at solving the code scattering and tangling problem, providing new mechanisms to support better separation of concerns. For specific scenarios where high runtime adaptability is an important requirement, dynamic Aspect-Oriented Programming (AOP) represents a useful tool. With dynamic AOP, components and aspects can be woven and unwoven at runtime, enabling appli- cations greater responsiveness when dealing with different or changing requirements. However, this responsiveness typically incurs a cost in terms of runtime performance and memory consumption. Objective: Build an efficient dynamic aspect weaver for Java that provides the best runtime performance compared to the existing approaches, minimum memory overhead consumption, and similar functionalities to the widespread runtime weavers. Method: We design and implement weaveJ, a dynamic aspect weaver for Java. This dynamic weaver leverages the invokedynamic opcode introduced in Java 7, which allows dynamic relinkage of method and field access. We compare the functionalities of weaveJ with the existing dynamic weavers for Java, and evaluate their runtime performance and memory consumption. Results: weaveJ shows the best runtime performance for all benchmarks and real applications executed. Method interception with invokedynamic is at least 142% faster than the techniques used by the existing runtime weavers. The average cost of dynamic weaving using invokedynamic is only 2.2% for short running programs, and 1.5% for long running applications. -
Comprehensive Aspect Weaving for Java
Science of Computer Programming 76 (2011) 1015–1036 Contents lists available at ScienceDirect Science of Computer Programming journal homepage: www.elsevier.com/locate/scico Comprehensive aspect weaving for Java Alex Villazón ∗, Walter Binder, Philippe Moret, Danilo Ansaloni Faculty of Informatics, University of Lugano, CH-6900 Lugano, Switzerland article info a b s t r a c t Article history: Aspect-oriented programming (AOP) has been successfully applied to application code Received 20 July 2009 thanks to techniques such as Java bytecode instrumentation. Unfortunately, with existing Received in revised form 19 October 2009 AOP frameworks for Java such as AspectJ, aspects cannot be woven into the standard Java Accepted 2 December 2009 class library. This restriction is particularly unfortunate for aspects that would benefit Available online 29 April 2010 from comprehensive aspect weaving with complete method coverage, such as profiling or debugging aspects. In this article we present MAJOR, a new tool for comprehensive aspect Keywords: weaving, which ensures that aspects are woven into all classes loaded in a Java Virtual Aspect-oriented programming Aspect weaving Machine, including those in the standard Java class library. MAJOR includes the pluggable Bytecode instrumentation module CARAJillo, which supports efficient access to a complete and customizable calling Profiling context representation. We validate our approach with three case studies. Firstly, we Debugging weave existing profiling aspects with MAJOR which otherwise would generate incomplete Detecting memory leaks profiles. Secondly, we introduce an aspect for memory leak detection that also benefits Recreating crashing conditions from comprehensive weaving. Thirdly, we present an aspect subsuming the functionality Java Virtual Machine of ReCrash, an existing tool based on low-level bytecode instrumentation techniques that generates unit tests to reproduce program failures.