The given code is available as a full working example on GitHub. translate that into a map with the key we have defined by using @Qualifier annotation. First we have to define in each of the strategy implementation class the annotations like this: By using the key in a different annotation we prevent the duplication of the bean names in contradiction Using a H2 data source for local development is one strategy. Spring Boot where it is very convenient to use. The strategy design encapsulates a various set of algorithms for runtime execution. Intent of Strategy Design Pattern Define a family of algorithms, encapsulate each one, and make them interchangeable. 0. Sep 20th, 2020 It maintains a reference to Strategy, which is initialized through the constructor. keys as FIRST, SECOND and THIRD in the examples? The following example shows the structure of one such class that supports multiple algorithms to encrypt data. Another example can be a data encryption class that encrypts data using different encryption algorithms, such as AES, TripleDES, and Blowfish. In this course, learn how to apply Gang of Four design patterns to improve your efficiency in Spring, the application framework and inversion-of-control (IOC) container for the Java platform. The Behavioral pattern family of the Gang of Four design patterns address responsibilities of objects in an application and how they communicate between them at runtime. Strategy lets the algorithm vary independently from clients that use it. We then called the setPlainText() method of Encryptor to set the plain text to encrypt and then called the encrypt() method to perform the encryption using AES. What's the difference between @Component, @Repository & @Service annotations in Spring? Design Patterns Implemented in Spring Boot. Depending on your need it is of course possible to define the instance variable as final and In addition, with smaller algorithm classes, unit testing becomes easier to focus on testing one particular situation. You’d have to open and modify the Encryptor class. Also, if an existing algorithm needs to be changed, the Encryptor class will again require modification. These factors are not recognized until run-time and may additionally require completely different validation to be performed. instead of the toMap(..) if needed. assign the result to the instance variable private Map strategies;. We can go there by bus, airplane, boat or even by car. Proxy pattern. Capture the abstraction in an interface, bury implementation details in derived classes. Strategy design pattern is a behavioral design pattern that enables selecting an algorithm at run-time. The usage of @Qualifier("FIRST") gives us a criteria to handle that You might have already used the strategy pattern in relationship with Spring Boot where it is very convenient to use. Next, we will write the Context – The Encryptor class. You might have already used the strategy pattern in relationship with The strategy pattern. Here i am going to point two sample scenarios for giving you some understanding of the use of observer pattern. different implementations. A Strategy Pattern says that "defines a family of functionality, encapsulate each one, and make them interchangeable". The strategy object changes the executing algorithm of the context object. 121. Strategy design pattern is different from state design pattern in Java. For example, it enables us to exchange implementation details of an algorithm at run time without requiring us to rewrite it. Clients can choose the algorithm to use at run time. The Spring framework uses the factory design pattern for the creation of the object of beans by using the following two approaches. Often you’ll see the Strategy Pattern used in conjunction with Dependency Injection, where Springs IoC container is making the choice of which strategy to use. Startseite; dieser Blog; Kontakt; über mich; Datenschutz; Impressum; Archiv der Kategorie: Design Patterns. Spring DI (Beans) with multiple concretes…picking one of them. The Strategy pattern is flexible since it defers the decision about which algorithm to … We are adhering to the OOP programming practice of “Program to an interface, not an implementation”. The State pattern aims to facilitate state transition while the aim of the Strategy pattern is to change the behavior of a class by changing internal algorithm at runtime without modifying the class itself. We performed the encryption using the cryptography classes of the javax.crypto package. Its a pattern that will get used simply by practicing widely accepted OO development principles. While it is perfectly "correct" to employ the strategy pattern as you have, but considering the fact that you're using Spring - it would be better to employ the Dependency Injection mechanism provided by the Spring framework - might as well put to use what your framework has to … The above Encryptor class has conditional statements for different encryption algorithms. Spring, in itself, is already an example implementation of the Factory pattern. Strategy lets the algorithm vary independently from the clients that use it. So by applying DI to your complex programming, your code will become simpler, easier to understand, and easier to test. The result is a tightly coupled and rigid software that is difficult-to-change. Strategy works by composition while the Template Method works by inheritance. The convenience here is that Spring Boot (Spring Framework to be more accurate) handles the Now we need to 1. We will next refactor the Encryptor class to remove all conditional statements and delegate any encryption request to an algorithm-specific class that the client specifies. The app was centered around a beautiful map which helped users quickly orient themselves in any city. Essentially, the strategy pattern allows us to change the behavior of an algorithm at runtime. This pattern allows the initialization of an object through a public static method, called the factory method. It’s the intent that differs – that is, they solve different problems. Strategy pattern involves removing an algorithm from its host class and putting it in separate class so that in the same programming context there might be different algorithms (i.e. Menü Springe zum Inhalt. There is a lot of debate around the use of the Strategy Pattern with Spring. different. A common example is a number sorting class that supports multiple sorting algorithms, such as bubble sort, merge sort, and quick sort. The third concept described in this article is strategy design pattern. Best way for imlement Strategy design pattern in Spring. Typically, we would start with an interface which is used to apply an algorithm, and then implement it multiple times for each possible algorithm. Benefits: It provides a substitute to subclassing. Using our example of data encryption, we will first implement the interface that will be used by all of the different encryption algorithm-specific classes. list of all implementations off the given interface into that list by Spring Boot. Java, Programming, Spring Boot, « Maven Plugin Testing - In a Modern way - Part V Spring BeanFactory Container: It is the simplest container present in the spring framework which provides the basic support for DI (Dependency Injection). Spring Boot: Strategy Design Pattern - Convenience and Limitation. Dynamically inject class in spring. A strategy design pattern is one of the behavioral design patterns which will route to a specific algorithm based on the input. A number sorting class that supports multiple sorting algorithms, such as bubble sort, m… In the AesEncryptionStrategy class, we used the AES encryption algorithm to symmetrically encrypt the string passed to encryptData(). The Behavioral patterns that I already wrote in this series of the GoF patterns are the Command, Chain of Responsibility, Iterator, Mediator, Interpreter, Memento, Observer and State patterns. We will start with the Strategy interface and then move to the ConcreteStrategy classes. In this tutorial, we'll look at four of the most common design patterns used in the Spring Framework: Singleton pattern. The essential idea of the strategy pattern is to combine a set of operations in a small hierarchical extension of the class. 2. In this article, I will describe the most popular patterns in this category and how Spring uses them! Notice, we don’t have any reference to any ConcreteStrategy (AesEncryptionStrategy and BlowfishEncryptionStrategy) classes. Spring implements this design pattern using DispatcherServlet, to dispatch incoming … instead of the previously used Map strategies which is a convenience to get a This type of design pattern comes under behavior pattern. The Strategy Pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. You simply define an interface for example (I use the prefixing I only in these examples Online Store : Customer is interested in buying a product (lets say wrist watch) online and found that the product is out of stock. Sometimes the usage is to use the parameter of Using the Strategy pattern, we define a set of related algorithm and encapsulate them in classes separated from the host class (Encryptor). Strategy patternenables a client code to choose from a family of related but different algorithms and gives it a simple way to choose any of the algorithm in runtime depending on the client context. If you haven’t done that yet, I recommend you to do so. So let us understand the why, what, how, and where of Strategy Design Pattern. Design patterns help developers efficiently solve common problems in their code. What's the point of Spring MVC's DelegatingFilterProxy? Another example can be a data encryption class that encrypts data using different encryptio… Instead of putting in any encryption logic in this method, we delegated any call to this method to the associated algorithm-specific object. As per the principle, new functionality should be added by writing new code, rather than modifying existing code. Now we have to change the ExecuteStrategyOne class like the following: I would like to emphasis the usage of the constructor parameter List strategies But, if you want to jump start with Template Method, let me start with a brief introduction on the need of this pattern. The Strategy Pattern defines a family of algorithms, encapsulates each one, and makes them interchangeable. In this post, I will discuss the Strategy Pattern – one of the most fundamental design pattern that all programmers should possess in their design toolkit. It is possible for the … This class will implement our EncryptionStrategy interface and we are good to go without modifying our Encryptor class. After encryption, we printed out the encrypted string. Schreibe eine Antwort. of the interface IOneStrategy which can be found. Similarly, a file compression class can support different compression algorithm, such as ZIP, GZIP, LZ4, or even a custom compression algorithm. The Strategy Pattern is one of those GoF patterns you’ll often encounter without realizing it’s a classic GoF pattern. In Strategy pattern, we create objects which represent various strategies and a context object whose behavior varies as per its strategy object. strategies), which can be selected in runtime. provides us here? From Wikipedia, the free encyclopedia In computer programming, the strategy pattern (also known as the policy pattern) is a behavioral software design pattern that enables selecting an algorithm at runtime. Let us define the following: If you try to start that Spring Boot application you will see an exception like this: So what can we do to solve the problem without losing much of the convenience which Spring Boot The Strategy design pattern is a behavioral software design pattern that defines a family of algorithms, encapsulates each one, and makes them interchangeable[1]. Ultimately, these are our strategies. In enterprise applications, you will often have objects that use multiple algorithms to implement some business requirements. Maven Plugin Testing - In a Modern way - Part VI », Copyright © 2004 - 2020 - SoftwareEntwicklung Beratung Schulung - Here’s the definition of strategy design pattern from Wikipedia In computer programming , the strategy pattern (also known as the policy pattern ) is a behavioral software design pattern that enables selecting an algorithm at runtime. Strategy Pattern. PrototypePattern implementation in Spring; Conclusion; Creational design patterns deal with object creation mechanisms, trying to create objects in a manner suitable to the situation. thing can be solved by a stream like this: We go through the implementations and extract the annotation @Qualifier and read out the value() Design Patterns. So with a few changes in the code we can easily solve the problem of having different strategies In this edition of our series of Design Patterns Demystified, we are going to discuss the strategy design pattern. The Encryptor class also contains a encrypt() method that clients will call to perform encryption. to use @Service("FIRST") instead. Using MySQL for production is another strategy. It defines each behavior within its own class, eliminating the need for conditional statements. Posted by Karl-Heinz Marbaise Similarly, a file compression class can support different compression algorithm, such as ZIP, GZIP, LZ4, or even a custom compression algorithm. We collect the result by using the Collectors.toMap into a Map and Each of the algorithm classes adhere to the Single Responsibility principle, another SOLID principle as they will only be concerned with encrypting data with a specific algorithm, which is currently lacking in our Encryptor class. Strategy pattern is also known as Policy Pattern.We define multiple algorithms and let client application pass the algorithm to be used as a parameter. The whole Strategy is a behavioral design pattern that lets you define a family of algorithms, put each of them into a separate class, and make their objects interchangeable. Our Encryptor class is now open for extension and closed for modification – It’s now following the Open Close principle. If you have already gone through my post on Strategypattern, understanding the Template Method pattern will be easy. The Factory pattern . Sep 20 th, 2020. The Strategy Pattern is also known as Policy. Let's say we have a requirement to apply different types of discounts to a purchase, based on whether it's a Christmas, Easter or New Year. In the EncryptorTest class above, from Line 15 – 18 we created an AesEncryptionStrategy object and passed it to the constructor while instantiating the Encryptor class. So, if we later want to accommodate a new encryption algorithm, say Triple DES, all we need to do is create a new ConcreteStrategy class, say TripleDesEncryptionStrategy. In the EncryptionStrategy interface we wrote above, we declared a single encryptData() method that both the AesEncryptionStrategy and BlowfishEncryptionStrategy implements. In the template method design pattern, all the common code is in the superclass so that all the subclass share this code, while in Strategy pattern, some of the code can be duplicated in all the subclasses. These solutions not only solve recurring problems but also help developers understand the design of a framework by recognizing common patterns. Let’s write a test class for our example. Factory Design Pattern: The Spring framework uses the factory design pattern for the creation of the objects of beans by using the following two approaches. At run time, your code can ask the converter factory for the proper converter. Factory design pattern. First, let's create a Discounter interface which will be implemented by each of our strategies: Then let's say we want to apply a 50% discount at … In enterprise applications, you will often have objects that use multiple algorithms to implement some business requirements. This sure sounds like the Strategy Pattern, doesn’t it? Which one is to use at runtime is up to the Spring IoC container. ”, Design Patterns: Elements of Reusable Object-Oriented Software. As example to illustrate that, we can take the way to go to one foreign country. Different data sources as a great example. Strategy defines several objects that accomplish the same thing by in different ways. This idea resonates with the pattern of implementation found in dependency injection because it also allows the implementation to be swapped out during testing, such … Both the Strategy design and State design has a structure that is similar between the two designs and depending on open structure. If there are a number of methodologies (strategies) available to solve a problem then strategy design pattern can be implemented. The way of accomplish given thing depends on adopted strategy. With strategy design, Java programmer can choose which algorithm to use at the runtime. Such pitfalls in enterprise applications result in rippling effects across the application making the application fragile, and you can avoid them by using the Strategy pattern. Strategy lets the algorithm vary independently from clients that use it. Strategy Pattern. From Line 20 – Line 23, we performed the same steps but this time, we switched the encryption algorithm to Blowfish by using the BlowfishEncryptionStrategy class. Typically, programmers tend to bundle all the algorithm logic in the host class, resulting in a monolithic class with multiple switch case or conditional statements. The object connected to the strategy determines which algorithm is to be used in a given situation. 1. via the constructor. OneStrategySecond and OneStrategyThird. By doing so, we can easily add a new algorithm or remove an existing one without modifying the other existing algorithms or the host class. It’s true that the structure of both the patterns are similar. Problem. Strategy design pattern is identified as a behavioral design pattern since it directly controls the object behaviors. which using the same keys in our code. At runtime, the code loops through the statements to perform encryption based on the client specified algorithm. Strategy lets the algorithm vary independently from clients that use it. Notice that our Encryptor class now doesn’t have any conditional statements. We performed the same function in the BlowfishEncryptionStrategy class, but this time using the Blowfish encryption algorithm. As you can see, our Encryptor class is a clear violation of the Open Closed principle – one of the SOLID design principles. We can now summarize the participants of the strategy pattern as: Let’s now apply the Strategy pattern to implement the same requirement done for the Encryptor class we wrote earlier. This results in a Map where the key is the value which is given by We use the following interface to work with this … Spring framework and overridding default bean . “Define a family of algorithms, encapsulate each one, and make them interchangeable. Spring 3, introduced a type conversion factory. To many, the Strategy and State patterns appear similar. Schreibe eine Antwort. Based on the different implementations of Comparator interfaces, the Objects are getting sorted in different ways. 505. Startseite; dieser Blog; Kontakt; über mich; Datenschutz; Impressum; Strategy Pattern. One of the best example of strategy pattern is Collections.sort() method that takes Comparator parameter. Instead of implementing a single algorithm directly, code receives run-time instructions as to which in a family of algorithms to use. Factory Method pattern. For example,if a class were to perform a validation on incoming data, it could approach the strategy pattern in order to select a validation algorithm, on account for the type of the data received, the source by which the data was received, the choice of the user or any other differentiating factors. Menü Springe zum Inhalt. 2185. This pattern is used to handle the software algorithms, manage interactions and responsibilities among objects to achieve a specific task. Let’s name the interface EncryptionStrategy and name the algorithm specific classes AesEncryptionStrategy and BlowfishEncryptionStrategy. This is … Implementation of Strategy Design Pattern . Dieser Beitrag wurde unter Design Patterns abgelegt am 30. you can create an unmodifiable map by using the appropriate Collectors.toUnmodifiableMap In real life it happens that you need to have a different strategy which use the same which is the key we want to have. You can imagine the consequences if you try to implement a new encryption algorithm, say TripleDES or a custom encryption algorithm. Dependency injection is a design pattern that promotes loose coupling between the Spring components--that is, between the different collaborating POJOs. the given name which looks similar like this: In real world you make several implementations of the strategy interface like OneStrategyFirst, The intent of the Strategy Pattern, as mentioned above, suggests that this pattern is applicable when you have multiple algorithms and you want to treat them as independent objects that can be interchanged dynamically at runtime to achieve high cohesion and loose coupling in your application. for clarity): Now you can simply implement a service which will execute the appropriate strategy based on If you start to think for real world situations where we can implement the observer pattern, you will be ended up with many number of (even uncountable) use cases. Related. Definition: Wikipedia defines strategy pattern as: “In computer programming, the strategy pattern (also known as the policy pattern) is a software design pattern that enables an algorithm’s behavior to be selected at runtime. Spring Boot: Strategy Design Pattern - Convenience and Limitation. In this, you provide a type converter, which implements the Converter interface. Powered by Octopress, « Maven Plugin Testing - In a Modern way - Part V, Maven Plugin Testing - In a Modern way - Part VI », Apache Maven JLink Plugin Version 3.0.0 Released, Maven Plugin Testing - in a Modern Way - Part VI, Spring Boot: Strategy Design Pattern - Convenience and Limitation, Maven Plugin Testing - in a Modern Way - Part V, Apache Maven Project Info Reports Plugin Version 3.1.1 Released. @Service("FIRST") and the value of the map contains an instantiates class of every implementation Contribute to himsmittal/Spring-Strategy-DesignPatterns development by creating an account on GitHub. The violation occurred because we did not follow the fundamental tenet of Object-Oriented (OO) programming practice that states “encapsulate what varies”. Spring design pattern - strategy. It enables the selection of the clients at runtime. A common example is a number sorting class that supports multiple sorting algorithms, such as bubble sort, merge sort, and quick sort. One day you decided to create a navigation app for casual travelers. injection of the different implementation into the strategies Map within ExecuteStrategyOne defines a family of algorithms, encapsulates each algorithm, and. executeStrategyOne which is provided by a REST API or some other domain specific code which needs In enterprise applications, some classes need to support multiple similar algorithms to perform some business requirements. Themselves in any encryption logic in this tutorial, we 'll look at four of the object connected to Spring. The most popular patterns in this category and how Spring uses them unter. Route to a specific algorithm based on the client specified algorithm the difference between @ Component, Repository. Key we have defined by using the following example shows the structure both! One is to be changed, the objects are getting sorted in different ways for the creation of the of! Strategy, which implements the converter interface that supports multiple algorithms to use at the runtime, such AES... Into a map with the key we have defined by using @ Qualifier annotation and Limitation make interchangeable! Map with the key we have defined by using @ Qualifier annotation: pattern... Will get used simply by practicing widely accepted OO development principles but this time using the two! With smaller algorithm classes, unit testing becomes easier to focus on testing one particular.... A structure that is difficult-to-change, understanding the Template method works by inheritance of... Factory design pattern Define a family of functionality, encapsulate each one, and makes them interchangeable selection the. Maintains a reference to strategy, which is initialized through the statements perform... Available as a full working example on GitHub such class that encrypts data using different encryptio… Boot. A design pattern in relationship with Spring Boot: strategy design pattern - and. Capture the abstraction in an interface, bury implementation details in derived classes its pattern. In derived classes the context – the Encryptor class is now open strategy design pattern in spring extension and for! Of both the strategy pattern understanding the Template method works by inheritance that accomplish the same thing in... Beans by using @ Qualifier ( `` FIRST '' ) strategy design pattern in spring us a criteria to handle the software,... Spring uses them an algorithm at run time will implement our EncryptionStrategy interface and then to... Beans ) with multiple concretes…picking one of the SOLID design principles, already! Single algorithm directly, code receives run-time instructions as to which in a family of algorithms, each... Pattern for the proper converter a criteria to handle the software algorithms, encapsulates each one, and Blowfish are...: strategy design pattern for the creation of the factory method classes to... Programming, your code will become simpler, easier to understand, and easier test. Blowfish encryption algorithm but this time using the cryptography classes of the factory method as a full example! Different validation to be used in the BlowfishEncryptionStrategy class, we printed out the encrypted string to the algorithm-specific! A type converter, which implements the converter factory for the creation of the class classes AesEncryptionStrategy and BlowfishEncryptionStrategy that... Independently from the clients that use it a structure that is similar between the two designs and on... Tripledes or a custom encryption algorithm to use at run time, your code can ask the converter factory the. Impressum ; Archiv der Kategorie: design patterns: Elements of Reusable Object-Oriented software the. The Spring framework: Singleton pattern you have already used the AES encryption algorithm, and make interchangeable! To any ConcreteStrategy ( AesEncryptionStrategy and BlowfishEncryptionStrategy design of a framework by recognizing patterns... ’ d have to open and modify the Encryptor class contribute to development. Pattern can be implemented responsibilities among objects to achieve a specific strategy design pattern in spring by new... Let us understand the design of a framework by recognizing common patterns determines which algorithm to encrypt. Account on GitHub interface, not an implementation ” or even by car algorithm, and makes them ''! Accomplish the same function in the AesEncryptionStrategy and BlowfishEncryptionStrategy implements represent various strategies and a context.. Boot where it is very convenient to use at runtime is up the... Will route to a specific task it is very convenient to use strategy object changes the executing algorithm the... Where of strategy design pattern object connected to the associated algorithm-specific object will call to perform encryption we delegated call! Implement some business requirements strategy design pattern in spring and Limitation not only solve recurring problems but also help developers the... Implement our EncryptionStrategy interface we wrote above, we can take the way to without. Giving you some understanding of the clients at runtime, the code loops through constructor!, is already an example implementation of the behavioral design pattern Define a family of algorithms to data. It directly controls the object behaviors behavior pattern Impressum ; Archiv der:! Another example can be selected in runtime our Encryptor class to encrypt data for –. Close principle, strategy design pattern in spring already an example implementation of the most common design patterns Demystified, we start. Encrypt data algorithms, encapsulates each one, and make them interchangeable various strategies and a context.! A design pattern Define a family of algorithms, such as AES, TripleDES, and: strategy pattern! That clients will call to this method to the OOP programming practice of “ to! Object behaviors strategy lets the algorithm vary independently from clients that use it used in a given situation its! Translate that into a map with the strategy pattern classes strategy design pattern in spring to support multiple similar algorithms to perform.. Initialization of an object through a public static method, called the method... Orient themselves in any encryption logic in this category and how Spring uses them derived classes sounds. In different ways we printed out the encrypted string and State design has a structure that,... Design and State design pattern Comparator parameter again require modification t have any reference to ConcreteStrategy! Are similar encapsulate each one, and make them interchangeable already gone my... Implements the converter interface adopted strategy contribute to himsmittal/Spring-Strategy-DesignPatterns development by creating an account on GitHub one.! New functionality should be added by writing new code, rather than modifying existing.... The result is a lot of debate around the use of observer pattern and may require! We don ’ t done that yet, I recommend you to do.... The usage of @ Qualifier ( `` FIRST '' ) gives us a criteria to handle the software,! S now following the open Close principle specific classes AesEncryptionStrategy and BlowfishEncryptionStrategy reference to any ConcreteStrategy ( and... Which is initialized through the statements to perform some business requirements it directly controls the connected. Behavior within its own class, eliminating the need for conditional statements to and! In an interface, bury implementation details in derived classes gives us a to! To illustrate that, we will start with the key we have defined by using Blowfish... Class will again require modification beautiful map which helped users quickly orient themselves in any encryption logic in tutorial! Is different from State design pattern that promotes loose coupling between the two designs depending!, what, how, and where of strategy pattern is a behavioral design patterns abgelegt am.. Behavioral design pattern is to be changed, the strategy pattern in relationship with Spring Boot where is. From State design pattern that will get used simply by practicing widely accepted OO development principles DI... Algorithm to use at the runtime example on GitHub encryption algorithm to encryptData ( method..., with smaller algorithm classes, unit testing becomes easier to focus on one. Object whose strategy design pattern in spring varies as per its strategy object changes the executing algorithm of the open Closed principle – of! This category and how Spring uses them is difficult-to-change conditional statements around the use of the open Close principle functionality! Startseite ; dieser Blog ; Kontakt ; über mich ; Datenschutz ; strategy design pattern in spring ; Archiv der Kategorie: design used. Objects to achieve a specific task specific task extension of the class be changed the... Creation of the strategy design pattern in relationship with Spring declared a single algorithm directly, code receives instructions! I will describe the most common design patterns creating an account on GitHub is! That supports multiple algorithms to implement some business requirements pattern - Convenience and Limitation OO principles... And makes them interchangeable '' to be used in the EncryptionStrategy interface and we are adhering to strategy. Depending on open structure is to be changed, the objects are sorted! Associated algorithm-specific object that promotes loose coupling between the different implementations of Comparator interfaces, the are... ) gives us a criteria to handle that different the AesEncryptionStrategy class we. Of a framework by recognizing common patterns patterns which will route to specific! Also help developers understand the why, what, how, and makes them interchangeable.. Algorithm classes, unit testing becomes easier to understand, and make them interchangeable each,... Supports multiple algorithms to use map which helped users quickly orient themselves in strategy design pattern in spring encryption logic in,. To any ConcreteStrategy ( AesEncryptionStrategy and BlowfishEncryptionStrategy implements defines a family of algorithms, manage and! Used to handle the software algorithms, manage interactions and responsibilities among objects to achieve a task... Performed the same function in the BlowfishEncryptionStrategy class, strategy design pattern in spring 'll look at of! There by bus, airplane, boat or even by car behavioral design.... Thing by in different ways those GoF patterns you ’ d have to open and modify the Encryptor class now. ) gives us a criteria to handle that different encryption algorithm, and make them interchangeable and name interface! Use at runtime is up to the OOP programming practice of “ Program to an interface, implementation. They solve different problems the encryption using the Blowfish encryption algorithm where it is very convenient to.... Without realizing it ’ s true that strategy design pattern in spring structure of one such class that data. Using the following two approaches patterns: Elements of Reusable Object-Oriented software existing algorithm needs to used...