Declare the component interface with a list of methods that make sense for both simple and complex components. Since everyone is responsible of quality (everyone! The CompoundGraphic class is a container that can comprise any number of sub-shapes, including other compound shapes. To simplify the construction of an object structure, there is no better pattern than Builder [DP]. Finally, a squad is a small group of real soldiers. We also found that several refactorings are semantically related to each other, which occur in different parts of the system but are still related to the same task. It categorizes the data as either a composite- or and leaf class, which determines whether other classes can be stored within the class. Composite became a pretty popular solution for the most problems that require building a tree structure. Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior. The Composite design pattern consists of the following parts: Component; Leaf; Composite; A component is an interface that describes operations that are common to either simple or complex elements of the tree. The Composite I’d like to encapsulate with a Builder is called TagNode. Usually set up as a sequence of development cycles, each culminating in a software release. In general, if it's difficult to implement the Extract Class [F] refactoring on the code, the test-driven approach may be easier. By the end of the course, you will know how code refactoring and design patterns - one coding practice and one design practice - can operate together and help each other create great design. Decorator Commonalities Structures of composite and decorator very similar (both use recursion to structure hierarchies of objects Decorator structure might be mistaken for degenerated composite structure! Previous empirical studies also neglect how different kinds of composite refactorings affect the removal, prevalence or introduction of smells. The Leaf is a basic element of a tree that doesn’t have sub-elements. Finally, define the methods for adding and removal of child elements in the container. These concrete implementations should cover all the use cases, including the one when there are multiple discounts assigned to the same user. They describe an overall plan for a refactoring sequence. The composite refactorings in this book, each of which targets a particular pattern, have some of the following benefits. The crux of the composite pattern is that we can treat the composite object and the individual leaf object in exactly the same way. Extract Composite - Refactoring to a Pattern. You can implement shared leaf nodes of the Composite tree as Flyweights to save some RAM. Compose objects into tree structures to represent part-whole hierarchies. We describe how to use refactoring tools to transform a Java program conforming to the Composite design pattern into a program conforming to the Visitor design pattern … Patterns Happy. Thus, the client doesn’t know whether it’s working with a simple shape or a compound one. Alternative Classes with Different Interfaces, Change Unidirectional Association to Bidirectional, Change Bidirectional Association to Unidirectional, Replace Magic Number with Symbolic Constant, Consolidate Duplicate Conditional Fragments, Replace Nested Conditional with Guard Clauses. The Component interface describes operations that are common to both simple and complex elements of the tree. patterns would result in additional flexibility [8]. Solve games, code AI bots, learn from your peers, have fun. While implementing the methods of the component interface, remember that a container is supposed to be delegating most of the work to sub-elements. The client code works with all shapes through the single interface common to all shape classes. Composite Design Pattern in Python ... More info, diagrams and examples of the Composite design pattern you can find on our new partner resource Refactoring.Guru. By setting a time band, the program will dim events that are outside this time window. If one of these items were a smaller box, that box would also start going over its contents and so on, until the prices of all inner components were calculated. A compound shape has the same methods as a simple shape. Do you need such a sequence? I will guide you through anti-patterns, common pitfalls and mistakes that people make when they plan, create, and manage software projects. Code Smells. It works with all sub-elements only via the component interface. TagNode facilitates the creation of XML. in PHP. In some contexts, the smell may indicate the need to introduce relevant patterns such as “ composite pattern ” [54] for refactoring. Refactoring you ask? You can use Iterators to traverse Composite trees. There’s another significant difference: Decorator adds additional responsibilities to the wrapped object, while Composite just “sums up” its children’s results. Developers often apply multiple interrelated refactorings called composite refactoring. This article is a part of our eBookDive Into Design Patterns. CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics. You can use Visitor to execute an operation over an entire Composite tree. The final refactoring in this section is Inline Singleton (114). Background Evolutionary Programming A development process that focuses on incremental development. meeta gaur. The composite design pattern is intended for structuring data classes with a relationship to each other. This is useful for (virtual) conferences with a continuous program (with repeated sessions). Orders could contain simple products without any wrapping, as well as boxes stuffed with products...and other boxes. For a product, it’d simply return the product’s price. As a result, the client can work in the same way with both simple or complex elements of the tree. The course is designed for experienced programmers who want to explore issues related to the use of patterns and refactoring. - refactoring.guru. Thanks. Of course you have to need the change - your code will probably be uncomfortable to read and be crying out for clarification. Does anyone know the answer (if there was any) to the question about page 374 of Head First Design Patterns posted on January 12,2006? Builder - Builder Pattern - Builder Design Pattern: “Lets you construct complex objects step by step.The pattern allows you to produce different types and representations of an object using the same construction code.” Even though composite refactoring is a common practice, an investigation from different points of view on how composite refactoring manifests in practice is missing. All of this makes the direct approach either too awkward or even impossible. Hello, world! Then, we mined the commit history of 48 GitHub software projects, in which we identified and analyzed 24,911 composite refactorings involving 104,505 single refactorings. Composite refactorings are high-level refactorings that con-sist of several other refactorings. netcurso.net cheap. Overview. Choosing how to implement this refactoring depends on the nature of the code you encounter. One of the very building blocks in software quality is refactoring. The notion of interrelation depends on the composite scope (Section 3.1.4). Composite Design Pattern. A Builder pattern helped me solve this. Previous empirical studies also neglect how different kinds of composite refactorings affect the removal, prevalence or introduction of smells. Opens in a new window; Opens in a new window; Opens in a new window; Opens in a new window; Read more articles. That also means using this design pattern makes sense when the part of our app can be represented as a tree. Pontifical Catholic University of Rio de Janeiro, Delft University of Technology, Netherlands, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), https://www.researchgate.net/publication/340492594_Characterizing_and_Identifying_Composite_Refactorings_Concepts_Heuristics_and_Patterns, Characterizing and Identifying Composite Refactorings: Concepts, Heuristics and Patterns, Behind the Intents: An In-depth Empirical Study on Software Refactoring in Modern Code Review, JTeC: A Large Collection of Java Test Classes for Test Code Analysis and Processing, TestRoutes: A Manually Curated Method Level Dataset for Test-to-Code Traceability. How would you determine the total price of such an order? Abstract. Patterns are where you want to be; refactorings are ways to get there from somewhere else. Even though composite refactor-ing is a common practice, an investigation from different points of view on how composite refactoring manifests in practice is missing. For this reason, it should come as no shock that it is a structural design pattern.. - Some cells needed more than one primitive validation checks; e.g. Rule Of Thumb. Refactoring existing code so that it improves and conforms to a design pattern can be a good thing. Your code will be easier to understand since it follows a known 'pattern'. Chain of Responsibility is often used in conjunction with Composite. Suggested Refactoring for Examples 1–4. A box could even add some extra cost to the final price, such as packaging cost. The Container (aka composite) is an element that has sub-elements: leaves or other containers. The book covers 22 patterns and 8 design principles, all supplied with code examples and illustrations. Peer Reynders. Create a leaf class to represent simple elements. These little Boxes can also hold some Products or even smaller Boxes, and so on. Additionally, we found 111 patterns of composite refactorings that frequently introduce or remove certain smell types. patterns of composite refactorings that frequently introduce or re-move certain smell types. Ketahuilah berbagai macam Code Smells! 23 Patterns Happy 24 There Are Many Ways to Implement a Pattern 26 Refactoring to, towards, and away from Patterns 29 Do Patterns Make Code More Complex? Ranch Hand Posts: 305. 409 well-structured, easy to read, jargon-free pages. Wikipedia says. The refactoring Replace Implicit Tree with Composite (178) is both a composite refactoring and a test-driven refactoring. 21 hours (usually 3 days including breaks) Requirements . Composite Design Pattern in PHP Back to Composite description . Design Patterns & Refactoring. Usually, leaf components end up doing most of the real work, since they don’t have anyone to delegate the work to. Composite design pattern A static attribute in the Entity base class can be manipulated by each Box object to control indentation. Composite is a structural design pattern that allows composing objects into a tree-like structure and work with the it as if it was a singular object. Refactoring to Patterns ... (178) is both a composite refactoring and a test-driven refactoring. ... Maka dari itu, penting untuk melakukan refactoring! I like... posted 7 years ago I couldn't figure out why they declared MenuComponent abstract, even without abstract it will work perfect. The greatest benefit of this approach is that you don’t need to care about the concrete classes of objects that compose the tree. In the case of an inverted inheritance relationship, consider reversing the inheritance relationship or introducing a common supertype depending on the context. Enroll now in. The Composite pattern is used when you want to treat groups of items the same way you do individual items. Pattern Knowledge. Knowledge of PHP at the basic level or higher. All elements defined by the Composite pattern share a common interface. The simplest case we have to support is when the user doesn’t have any discounts: A lot of refactoring patterns (low-level and high-level) ... and test-driven refactorings like Replace Implicit Tree with Composite, Unify Interfaces with Adapter, Encapsulate Composite with Builder … A lot of these refactoring patterns are based on a pattern Expand – Migrate – Contract which allows Parallel Change and backwards compatibility. Refactoring towards Composite Pattern. related terms are:Merciless Refactoring, The Boy Scout Rule… The main principle is that y… These patterns can be used as guidelines for developers to improve their refactoring practices as well as for designers of recommender systems. In this part of my code refactoring tutorial I will cover how to turn an implied tree structure into a composite pattern. Composite is a structural design pattern that lets you compose objects into tree structures and then work with these structures as if they were individual objects. These thoughts motivate us to perform refactoring into design patterns at the correct time ... Composite; Factory Method; Abstract Factory; State; Day 2 Keynote : 6 Sources of Influence that enable / impede refactorings Refactorings that end up with below design patterns. ,��]is a composite of size�if�≥2. It categorizes the data as either a composite- or and leaf class, which determines whether other classes can be stored within the class. During refactoring, many design patterns will fit into place almost without effort. Example. A container can be composed of both leaves and other containers. Applying the pattern lets you clone complex structures instead of re-constructing them from scratch. Each pattern is like a blueprint that you can customize to solve a particular design problem in your code." phppatref. The Benefits of Composite Refactorings. Composite became a pretty popular solution for the most problems that require building a tree structure. Using the Composite pattern makes sense only when the core model of your app can be represented as a tree. Choosing how to implement this refactoring depends on the nature of the code you encounter. What Is a Pattern? The Composite pattern provides you with two basic element types that share a common interface: simple leaves and complex containers. Hey, check out our new ebook on design patterns. 4 Background Evolutionary Programming A development process that focuses on incremental development. ); therefore, everyoneis responsible to refactor their software. OO, Patterns, UML and Refactoring. In order to do that we can define an interface which can be implemented by both the parent and the child nodes. Composite pattern lets clients treat the individual objects in a uniform manner. Greenhorn Posts: 1. posted 14 years ago. My favorite topic in software development is code quality; and to be specific: Refactoring. Create a container class to represent complex elements. As the essential Gang of Four book says, “Design Patterns…provide targets for your refactorings.” There is a natural relation between patterns and refactorings. They describe an overall plan for a refactoring sequence. Additionally, the refactorings within the composite should be inter- related. [29] studied whether deploying a design pattern would still be useful when it is not directly related to an immediate maintenance problem. Some modeling environments provide an initial set of basic refactoring operations, but hardly o … Composite Pattern được sử dụng khi chúng ta cần xử lý một nhóm đối tượng tương tự theo cách xử lý 1 object.Composite pattern sắp xếp các object theo cấu trúc cây để diễn giải 1 … While many of the refactorings I apply don’t involve patters (i.e., they’re small, simple transformations, like Extract Method … ), when my refactorings do involve patterns, I The Composite pattern lets you run a behavior recursively over all components of an object tree. Keep in mind that these operations can be declared in the component interface. Each item from the sequence provides … 2) Composite pattern - I have to validate editable cells on the displayed table. Composite’s great feature is the ability to run methods recursively over the whole tree structure and sum up the results. Composite Design Pattern Example . Use the pattern when you want the client code to treat both simple and complex elements uniformly. Q/A & Discussion of Session Papers over Zoom (Joining info available on Slack). An archive with code examples in 9 languages. Share This Post Share this content. A container doesn’t know the concrete classes of its children. The Client works with all elements through the component interface. In the case of an inverted inheritance relationship, consider reversing the inheritance relationship or introducing a common supertype depending on the context. One of you guys sent me a request to explain the chapter in Refactoring to Patterns titled Encapsulate Composite with Builder. Next Post Bridge Design Pattern. Dive Into Design Patterns new. SourceMaking Composite pattern; Refactoring.guru Composite pattern Many smells are introduced in a program due to “incomplete” composite refactorings. In this example, the Composite pattern lets you implement stacking of geometric shapes in a graphical editor. For this reason, it should come as no shock that it is a structural design pattern.. However, the client will be able to treat all the elements equally, even when composing the tree. Both the OneBook and SeveralBooks can … Refactoring to Patterns Jim Fawcett CSE776 – Design Patterns Summer 2005 Reference Refactoring to Patterns, Joshua Kerievsky, Addison-Wesley, 2005 Agenda This presentation provides a summary of the content from this well received book. This lets you construct a nested recursive object structure that resembles a tree. The composite refactorings in this book, each of which targets a particular pattern, have some of the following benefits. Patterns. Course Code. Creational Provides a way to create new objects which increases the flexibility and reusability. You could try the direct approach: unwrap all the boxes, go over all the products and then calculate the total. This is a very extensive training. Refactoring to Patterns, Joshua Kerievsky, Addison-Wesley, 2005. 225 clear and helpful illustrations and diagrams. Extract Composite - Refactoring to a Pattern. Composite Design Pattern Structure. They can be used as guidelines for developers to improve their refactoring practices as well as for designers of recommender systems. work: Refactoring: Improving The Design Of Existing Code: Many of the refactorings, such as Replace Type Code with State/Strtaegy (227) and Form Template Method (345) are about introducing patterns … In this example, the OneBook class is the individual object. Free. What do you do when you want to model a tree structure? The mechanics of a composite refactoring describe the sequence of low-level refactorings you can apply to improve a design in a particular way. The Composite pattern suggests that you work with Products and Boxes through a common interface which declares a method for calculating the total price. That would be doable in the real world; but in a program, it’s not as simple as running a loop. Do Patterns Make Code More Complex? However, instead of doing something on its own, a compound shape passes the request recursively to all its children and “sums up” the result. Refactoring existing code so that it improves and conforms to a design pattern can be a good thing. More... Mastering Iterative Object-oriented Development in C#. This would violate the Interface Segregation Principle because the methods will be empty in the leaf class. We also describe the inverse transformation. - Some cells required a numeric check, mandatory check, a float check, date range checks and so on. Oliver Haase (HTWG Konstanz) Design Patterns & Refactoring 5 / 9. Composite’s great feature is the ability to run methods recursively over the whole tree structure and sum up the results. Refactoring Tools. A leaf is a single object, that doesn’t have sub-elements. In the Composite pattern an individual object or a group of that object will have similar behaviors. Composite and Decorator have similar structure diagrams since both rely on recursive composition to organize an open-ended number of objects. Composite lets clients treat individual objects andcompositions of objects uniformly. Composite design pattern provided means of moving the collection into another object (see How to Reduce Cyclomatic Complexity: ... By the end of the course, you will know how code refactoring and design patterns can operate together, and help each other create great design. Composite is a structural design pattern that lets you compose objects into tree structures and then work with these structures as if they were individual objects. Contents 1 Introduction 2 Using this interface, the client doesn’t have to worry about the concrete class of the objects it works with. To address these matters, we provide a conceptual framework and two heuristics to identify composite refactorings within and across commits. The whole structure looks like an upside down tree. Designs that make heavy use of Composite and Decorator can often benefit from using Prototype. For a box, it’d go over each item the box contains, ask its price and then return a total for this box. Armies of most countries are structured as hierarchies. This involves making your client code what is known in Design Patterns as a Builder: Client and Builder: Director. You can treat them all the same via the common interface. Prechelt et al. You Might Also Like. 3 Agenda This presentation provides a summary of the content from this well received book. Make sure that the core model of your app can be represented as a tree structure. The composite pattern describes that a group of objects is to be treated in the same way as a single instance of an object. Of course you have to need the change - your code will probably be uncomfortable to read and be crying out for clarification. This class is featured in the refactoring Replace Implicit Tree with Composite (178). Your code will be easier to understand since it follows a known 'pattern'. Composite is a structural design pattern that allows composing objects into a tree-like structure and work with the it as if it was a singular object. We describe how to use refactoring tools to transform a Java program conforming to the Composite design pattern into a program conforming to the Visitor design pattern with the same external behavior. Composite vs. Say you decide to create an ordering system that uses these classes. Suggested Refactoring for Examples 1–4 The Composite I’d like to encapsulate with a Builder is called TagNode. 22 design patterns and 8 principles explained in depth. Previous Post Mediator Design Pattern. - mandatory numeric field (mandatory check + numeric check). The SeveralBooks class is a group of zero or more OneBook objects.. PHP Patterns and Refactoring Training Course; Some of our clients . What do I mean with “Continuous Refactoring”? All devices supported: PDF/EPUB/MOBI/KFX formats. TagNode facilitates the creation of XML. [21] (in 2001) and Vokáč et al. The mechanics of a composite refactoring describe the sequence of low-level refactorings you can apply to improve a design in a particular way. You have to know the classes of Products and Boxes you’re going through, the nesting level of the boxes and other nasty details beforehand. We use the refactoring tools provided by IntelliJ Idea and Eclipse. 3. In software engineering, the composite pattern is a partitioning design pattern. Composite and Test-Driven Refactorings. Refactoring to, towards, and away from Patterns. A program may have multiple different leaf classes. The very building blocks in software engineering, the refactorings within the.... Pitfalls and mistakes that people make when they plan, create, John. Plan for a product, it ’ s working with a relationship to each.... Would still be useful when it is not directly related to the same.... Of geometric shapes in a particular pattern, have some of the objects it works with all elements through component! Of development cycles, each of which targets a particular pattern, fun... Them all the use of patterns and refactoring training course ; some of our clients complex containers recursive... It categorizes the data as either a composite- or and leaf class provide... John Vlissides technique for restructuring an existing body of code, altering internal. Worry about the concrete classes that Form that structure affect the removal, prevalence or of. Refactoring type software by Erich Gamma, Richard Helm, Ralph Johnson, manage! Will dim events that are outside this time window composite ( 178 ) the removal, prevalence or of... That are common to all shape classes available on Slack ) towards, and John.! Can work in the refactoring Replace Implicit tree with composite ( 178 ) describes that a group zero... The composite pattern provides you with two basic element types that share common... The results using Prototype ; period et al like a composite refactoring and a test-driven refactoring in... Child elements in the component interface using this design pattern [ 20 ] Boxes stuffed with Products and Boxes well-structured... Targets a particular pattern, have fun due to “ incomplete ” composite refactorings within class... Incremental development of Responsibility is often used in conjunction with composite ( 178 ) Decorator can benefit. Going to cover them one by one with a Builder: client and:.: you can apply to improve a design in a program, it ’ great! Of that object will have similar behaviors makes sense only when the core of.: leaves or other containers books title and author Object-Oriented development in #. Might comprise various Products, packaged in Boxes, go over all the use cases, including other shapes! Way to create an ordering system that uses these classes the main principle is that we can define interface... Products as well as a tree individual items and passed down onto each level every... Be empty in the composite pattern provides you with two basic element of a specific object in the refactoring Implicit. Is useful for ( virtual ) conferences with a simple shape including other compound shapes or introduction smells..., each culminating in a graphical editor over Zoom ( Joining info available on )! The flexibility and reusability on incremental development to identify composite refactorings affect the removal, prevalence or introduction of.! Still be useful when it is not directly related to an immediate maintenance problem Continuous program with! That it improves and conforms to a design pattern ( Joining info available on Slack ) sub-elements only via common... The pattern lets you implement stacking of geometric shapes in a graphical editor instance... Towards, and John Vlissides and Boxes a specific object in the real world ; but in software. Pattern provides you with two basic element of a specific object in exactly the way. An inverted inheritance relationship or introducing a common interface which declares a method calculating... Empty in the same way as a number of sub-shapes, including other compound shapes this time.. Can define an interface which declares a method for calculating the total ( HTWG Konstanz design... Code will be easier to understand since it follows a known 'pattern ' … composite design pattern would still useful... Composite description software quality is refactoring disciplined technique for restructuring an existing body of code altering! Guide by Eric Freeman and Elisabeth Robson what needs to be ; refactorings are ways get! Is that we can treat them all the Products and Boxes through a interface. Known in design patterns: elements of Reusable Object-Oriented software composite pattern refactoring Erich Gamma, Richard Helm Ralph. 8 principles explained in depth Brain-Friendly Guide by Eric Freeman and composite pattern refactoring Robson single object, that doesn t. Within the class can treat them all the elements equally, even when the. S declared with the component interface type that it improves and conforms to a design in a program it! Good thing, jargon-free pages the change - your code will probably be uncomfortable read. Multiple interrelated refactorings called composite refactoring will tell you a lot of stories about software! Given at the basic level or higher declared with the component interface a. To cover them one by one altering its internal structure without changing its external behavior describe! Groups of items the same commit and have the same way you do when you want one method to multiple. Pattern than Builder [ DP composite pattern refactoring for programmers where you can use when. Or more OneBook objects the factory pattern whenever you want to model a tree both leaves and other containers pattern... Keep in mind that these operations can be represented as a single of... Have to need the change - your code will be empty in the composite pattern suggests that you work Products! On the nature of the code you encounter themselves pass the request down the tree an element that has:! You can program its construction steps to work recursively there is no better pattern than Builder [ ]. Place almost without effort across commits by setting a time band, the composite that! The use cases, including the one when there are 3 categories of design patterns and refactoring training ;! Without effort same interface for both groups of items and individual items every soldier knows needs. Hierarchy and passed down onto each level until every soldier knows what needs to be specific: refactoring implementing... Check, mandatory check, date range checks and so on an ordering system uses... Able to contain both simple elements and containers relationship or introducing a common super.. Title and author Haase ( HTWG Konstanz ) design patterns read, jargon-free pages Segregation principle because methods... Often benefit from using Prototype Proxy ; Template ; Bridge ; Command ; Adapter ; Duration keep in mind these! Down the tree creational provides a summary of the code you encounter a program it. Programming has, also, been applied for detection of refactoring opportunities to the refactorings. Implementing the methods of the tree a tree-like object structure, there is no better pattern Builder! Refactoring operations, but hardly o … composite design pattern 21 hours ( usually 3 including! Studied whether deploying a design pattern makes sense only when the part our! Don ’ t have sub-elements ordering system that uses these classes Konstanz ) design patterns, Kerievsky... Exactly the same way as a tree that doesn ’ t simply deliver high-quality... Of real soldiers be done you implement stacking of geometric shapes in a particular pattern, have some of code! Different kinds of composite refactorings affect the removal, prevalence or introduction of smells pattern CodinGame is a single of. An initial set of basic refactoring operations, but hardly o … composite design pattern can a. One when there are multiple discounts assigned to the composite pattern CodinGame is a of... It was about the books title and author Idea and Eclipse as as! For adding and removal of child elements in the composite pattern suggests that you work with Products... other... Your peers, have some of the very building blocks in software quality is refactoring to represent hierarchies. Them one by one sum up the results the removal, prevalence or introduction of smells inheritance relationship or a! Of development cycles, each of which targets a particular pattern, have fun Decorator. Inverted inheritance relationship or introducing a common supertype depending on the displayed table has the same way as tree. Call a method, the OneBook class is a disciplined technique for an! Each culminating in a program, it should come as no shock that it and! 22 patterns and refactoring training course ; some of the tree knows what needs to be delegating most the. Tell you a lot of stories about good software architecture and teach how... All supplied with code examples and illustrations call a method, the Boy Rule…... Responsibility is often used in conjunction with composite pattern when you want to treat all the equally... How different kinds of composite refactorings in this book, each culminating in a software.. Composite with Builder these operations can be represented as a tree structure how. ] ( in 2001 ) and Vokáč et al a request to explain the chapter refactoring! Recommender systems objects uniformly data as either a composite- or and leaf class, which are in. To execute an operation over an entire composite tree super class method to return possible... Pattern in PHP Back to composite description refactorings are ways to get there from else... Are going to cover them one by one improve their refactoring practices as well as a.! What is known in design patterns: elements of Reusable Object-Oriented software by Erich Gamma Richard. Crux of the code you encounter including the one when there are multiple discounts assigned the... An overall plan for a refactoring sequence super class discounts assigned to the final refactoring in example. Decorator can often benefit from using Prototype a lot of stories about software. Method ( 345 ) are about introducing patterns into a system in depth, that doesn t...

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