https://github.com/iluwatar/java-design-patterns-web/issues/8 Update pattern categories and tags

abstract-document/README.md

@@ -5,8 +5,7 @@ folder: abstract-document
 permalink: /patterns/abstract-document/
 categories: Structural
 tags: 
- - Java
+ - Extensibility
- - Difficulty-Intermediate
 ---
 
 ## Intent

abstract-factory/README.md

@@ -5,9 +5,7 @@ folder: abstract-factory
 permalink: /patterns/abstract-factory/
 categories: Creational
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Also known as

acyclic-visitor/README.md

@@ -5,8 +5,7 @@ folder: acyclic-visitor
 permalink: /patterns/acyclic-visitor/
 categories: Behavioral
 tags:
- - Java
+ - Extensibility
- - Difficulty-Intermediate
 ---
 
 ## Intent

adapter/README.md

@@ -5,9 +5,7 @@ folder: adapter
 permalink: /patterns/adapter/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Beginner
 ---
 
 ## Also known as

aggregator-microservices/README.md

@@ -5,8 +5,7 @@ folder: aggregator-microservices
 permalink: /patterns/aggregator-microservices/
 categories: Architectural
 tags:
-- Java
+- Cloud distributed
-- Spring
 ---
 
 ## Intent

ambassador/README.md

@@ -5,8 +5,7 @@ folder: ambassador
 permalink: /patterns/ambassador/
 categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent

api-gateway/README.md

@@ -5,9 +5,8 @@ folder: api-gateway
 permalink: /patterns/api-gateway/
 categories: Architectural
 tags:
-- Java
+- Cloud distributed
-- Difficulty-Intermediate
+- Decoupling
-- Spring
 ---
 
 ## Intent

async-method-invocation/README.md

@@ -5,9 +5,6 @@ folder: async-method-invocation
 permalink: /patterns/async-method-invocation/
 categories: Concurrency
 tags:
- - Java
- - Difficulty-Intermediate
- - Functional
  - Reactive
 ---
 

balking/README.md

@@ -5,8 +5,7 @@ folder: balking
 permalink: /patterns/balking/
 categories: Concurrency
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

bridge/README.md

@@ -5,9 +5,7 @@ folder: bridge
 permalink: /patterns/bridge/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Also known as

builder/README.md

@@ -5,9 +5,7 @@ folder: builder
 permalink: /patterns/builder/
 categories: Creational
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Intent

business-delegate/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Business Delegate
 folder: business-delegate
 permalink: /patterns/business-delegate/
-categories: Business Tier
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent

bytecode/README.md

@@ -5,8 +5,7 @@ folder: bytecode
 permalink: /patterns/bytecode/
 categories: Behavioral
 tags:
- - Java
+ - Game programming
- - Difficulty-Beginner
 ---
 
 ## Intent

caching/README.md

@@ -3,10 +3,8 @@ layout: pattern
 title: Caching
 folder: caching
 permalink: /patterns/caching/
-categories: Other
+categories: Behavioral
 tags:
- - Java
- - Difficulty-Intermediate
  - Performance
 ---
 

callback/README.md

@@ -3,12 +3,9 @@ layout: pattern
 title: Callback
 folder: callback
 permalink: /patterns/callback/
-categories: Other
+categories: Idiom
 tags:
- - Java
+ - Reactive
- - Difficulty-Beginner
- - Functional
- - Idiom
 ---
 
 ## Intent

chain/README.md

@@ -5,9 +5,7 @@ folder: chain
 permalink: /patterns/chain/
 categories: Behavioral
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Intent

circuit-breaker/README.md

@@ -3,11 +3,10 @@ layout: pattern
 title: Circuit Breaker
 folder: circuit-breaker
 permalink: /patterns/circuit-breaker/
-categories: Other
+categories: Behavioral
 tags:
- - Java
  - Performance
- - Difficulty-Intermediate
+ - Decoupling
 ---
 
 ## Intent
@@ -179,6 +178,7 @@ Use the Circuit Breaker pattern when
 - [Retry Pattern](https://github.com/iluwatar/java-design-patterns/tree/master/retry)
 
 ## Real world examples
+
 * [Spring Circuit Breaker module](https://spring.io/guides/gs/circuit-breaker)
 * [Netflix Hystrix API](https://github.com/Netflix/Hystrix)
 

collection-pipeline/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Collection Pipeline
 folder: collection-pipeline
 permalink: /patterns/collection-pipeline/
-categories: Other
+categories: Functional
 tags:
- - Java
+ - Reactive
- - Difficulty-Beginner
- - Functional
 ---
 
 ## Intent
@@ -28,4 +26,4 @@ Use the Collection Pipeline pattern when
 
 * [Function composition and the Collection Pipeline pattern](https://www.ibm.com/developerworks/library/j-java8idioms2/index.html)
 * [Martin Fowler](https://martinfowler.com/articles/collection-pipeline/)
-* [Java8 Streams](https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html)
+* [Java8 Streams](https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html)

combinator/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Combinator
 folder: combinator
 permalink: /patterns/combinator/
-categories: Behavioral
+categories: Idiom
 tags:
- - Functional
  - Reactive
- - Idiom
 ---
 
 ## Also known as
@@ -23,13 +21,16 @@ and some "combinators" which can combine values of type T in various ways to bui
 
 ## Applicability
 Use the combinator pattern when:
+
 - You are able to create a more complex value from more plain values but having the same type(a combination of them)
 
 ## Real world examples
+
 - java.util.function.Function#compose
 - java.util.function.Function#andThen
 
 ## Credits
+
 - [Example for java](https://gtrefs.github.io/code/combinator-pattern/)
 - [Combinator pattern](https://wiki.haskell.org/Combinator_pattern)
-- [Combinatory logic](https://wiki.haskell.org/Combinatory_logic)
+- [Combinatory logic](https://wiki.haskell.org/Combinatory_logic)

command/README.md

@@ -5,10 +5,7 @@ folder: command
 permalink: /patterns/command/
 categories: Behavioral
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
- - Functional
 ---
 
 ## Also known as

commander/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Commander
 folder: commander
 permalink: /patterns/commander/
-categories: Other
+categories: Concurrency
 tags:
- - Java
+ - Cloud distributed
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -24,4 +23,5 @@ Handling distributed transactions can be tricky, but if we choose to not handle
 We need a mechanism in place which can handle these kinds of situations. We have to direct the order to either one of the services (in this example, shipping) and then add the order into the database of the other service (in this example, payment), since two databses cannot be updated atomically. If currently unable to do it, there should be a queue where this request can be queued, and there has to be a mechanism which allows for a failure in the queueing as well. All this needs to be done by constant retries while ensuring idempotence (even if the request is made several times, the change should only be applied once) by a commander class, to reach a state of eventual consistency.
 
 ## Credits
+
 * [https://www.grahamlea.com/2016/08/distributed-transactions-microservices-icebergs/]

composite/README.md

@@ -5,9 +5,7 @@ folder: composite
 permalink: /patterns/composite/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Intent

converter/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Converter
 folder: converter
 permalink: /patterns/converter/
-categories: Business Tier
+categories: Creational
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

cqrs/README.md

@@ -5,8 +5,8 @@ folder: cqrs
 permalink: /patterns/cqrs/
 categories: Architectural
 tags:
- - Java
+ - Performance
- - Difficulty-Intermediate
+ - Cloud distributed
 ---
 
 ## Intent

dao/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Data Access Object
 folder: dao
 permalink: /patterns/dao/
-categories: Persistence Tier
+categories: Architectural
 tags:
- - Java
+ - Data access
- - Difficulty-Beginner
 ---
 
 ## Intent

data-bus/README.md

@@ -6,8 +6,7 @@ permalink: /patterns/data-bus/
 
 categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent

data-locality/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Data Locality
 folder: data-locality
 permalink: /patterns/data-locality/
-categories: Other
+categories: Behavioral
 tags:
- - Java
+ - Game programming
- - Difficulty-Intermediate
  - Performance
 ---
 

data-mapper/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Data Mapper
 folder: data-mapper
 permalink: /patterns/data-mapper/
-categories: Persistence Tier
+categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

data-transfer-object/README.md

@@ -5,10 +5,7 @@ folder: data-transfer-object
 permalink: /patterns/data-transfer-object/
 categories: Architectural
 tags:
- - Java
+ - Performance
- - KISS
- - YAGNI
- - Difficulty-Beginner
 ---
 
 ## Intent

decorator/README.md

@@ -5,9 +5,8 @@ folder: decorator
 permalink: /patterns/decorator/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Beginner
+ - Extensibility
 ---
 
 ## Also known as

delegation/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Delegation
 folder: delegation
 permalink: /patterns/delegation/
-categories: Behavioral
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Also known as

dependency-injection/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Dependency Injection
 folder: dependency-injection
 permalink: /patterns/dependency-injection/
-categories: Behavioral
+categories: Creational
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

dirty-flag/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Dirty Flag
 folder: dirty-flag
 permalink: /patterns/dirty-flag/
-categories: Other
+categories: Behavioral
 tags:
- - Java
+ - Game programming
- - Difficulty-Beginner
  - Performance
 ---
 

double-buffer/README.md

@@ -3,10 +3,10 @@ layout: pattern
 title: Double Buffer 
 folder:  double-buffer  
 permalink: /patterns/double-buffer/  
-categories: Other  
+categories: Behavioral
 tags:  
- - Java  
+ - Performance
- - Difficulty-Beginner  
+ - Game programming  
 ---  
   
 ## Intent  
@@ -19,11 +19,8 @@ Double buffering is a term used to describe a device that has two buffers. The u
 This pattern is one of those ones where you’ll know when you need it. If you have a system that lacks double buffering, it will probably look visibly wrong (tearing, etc.) or will behave incorrectly. But saying, “you’ll know when you need it” doesn’t give you much to go on. More specifically, this pattern is appropriate when all of these are true:
 
 - We have some state that is being modified incrementally.
-
 - That same state may be accessed in the middle of modification.
-
 - We want to prevent the code that’s accessing the state from seeing the work in progress.
-
 - We want to be able to read the state and we don’t want to have to wait while it’s being written. 
 
 ## Credits  

double-checked-locking/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Double Checked Locking
 folder: double-checked-locking
 permalink: /patterns/double-checked-locking/
-categories: Concurrency
+categories: Idiom
 tags:
- - Java
+ - Performance
- - Difficulty-Beginner
- - Idiom
 ---
 
 ## Intent

double-dispatch/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Double Dispatch
 folder: double-dispatch
 permalink: /patterns/double-dispatch/
-categories: Other
+categories: Idiom
 tags:
- - Java
+ - Extensibility
- - Difficulty-Intermediate
- - Idiom
 ---
 
 ## Intent

eip-aggregator/README.md

@@ -5,9 +5,7 @@ folder: eip-aggregator
 permalink: /patterns/eip-aggregator/
 categories: Integration
 tags:
- - Java
+ - Enterprise Integration Pattern
- - Difficulty-Intermittent
- - EIP
 ---
 
 ## Intent

eip-message-channel/README.md

@@ -5,9 +5,7 @@ folder: eip-message-channel
 permalink: /patterns/eip-message-channel/
 categories: Integration
 tags:
- - Java
+ - Enterprise Integration Pattern
- - EIP
- - Apache Camel™
 ---
 
 ## Intent

eip-publish-subscribe/README.md

@@ -5,9 +5,7 @@ folder: eip-publish-subscribe
 permalink: /patterns/eip-publish-subscribe/
 categories: Integration
 tags:
- - Java
+ - Enterprise Integration Pattern
- - EIP
- - Apache Camel™
 ---
 
 ## Intent

eip-splitter/README.md

@@ -5,9 +5,7 @@ folder: eip-splitter
 permalink: /patterns/eip-splitter/
 categories: Integration
 tags:
- - Java
+ - Enterprise Integration Pattern
- - Difficulty-Intermittent
- - EIP
 ---
 
 ## Intent

eip-wire-tap/README.md

@@ -5,9 +5,7 @@ folder: eip-wire-tap
 permalink: /patterns/eip-wire-tap/
 categories: Integration
 tags:
- - Java
+ - Enterprise Integration Pattern
- - Difficulty-Intermittent
- - EIP
 ---
 
 ## Intent

event-aggregator/README.md

@@ -5,8 +5,6 @@ folder: event-aggregator
 permalink: /patterns/event-aggregator/
 categories: Structural
 tags:
- - Java
- - Difficulty-Beginner
  - Reactive
 ---
 

event-asynchronous/README.md

@@ -5,9 +5,7 @@ folder: event-asynchronous
 permalink: /patterns/event-asynchronous/
 categories: Concurrency
 tags:
- - difficulty-intermediate
+ - Reactive
- - performance
- - Java
 ---
 
 ## Intent

event-driven-architecture/README.md

@@ -5,8 +5,6 @@ folder: event-driven-architecture
 permalink: /patterns/event-driven-architecture/
 categories: Architectural
 tags:
- - Java
- - Difficulty-Intermediate
  - Reactive
 ---
 

event-queue/README.md

@@ -5,9 +5,7 @@ folder: event-queue
 permalink: /patterns/event-queue/
 categories: Concurrency
 tags:
- - Java
+ - Game programming
- - Difficulty Intermediate
- - Queue
 ---
 
 ## Intent

event-sourcing/README.md

@@ -5,8 +5,6 @@ folder: event-sourcing
 permalink: /patterns/event-sourcing/
 categories: Architectural
 tags:
- - Java
- - Difficulty Intermediate
  - Performance
 ---
 

execute-around/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Execute Around
 folder: execute-around
 permalink: /patterns/execute-around/
-categories: Other
+categories: Idiom
 tags:
- - Java
+ - Extensibility
- - Difficulty-Beginner
- - Idiom
 ---
 
 ## Intent
@@ -25,4 +23,5 @@ Use the Execute Around idiom when
 * you use an API that requires methods to be called in pairs such as open/close or allocate/deallocate.
 
 ## Credits
+
 * [Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions](http://www.amazon.com/Functional-Programming-Java-Harnessing-Expressions/dp/1937785467/ref=sr_1_1)

extension-objects/README.md

@@ -5,8 +5,7 @@ folder: extension-objects
 permalink: /patterns/extension-objects/
 categories: Behavioral
 tags:
- - Java
+ - Extensibility
- - Difficulty-Intermediate
 ---
 
 ## Intent

facade/README.md

@@ -5,9 +5,8 @@ folder: facade
 permalink: /patterns/facade/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Beginner
+ - Decoupling
 ---
 
 ## Intent

factory-kit/README.md

@@ -5,9 +5,7 @@ folder: factory-kit
 permalink: /patterns/factory-kit/
 categories: Creational
 tags:
- - Java
+ - Extensibility
- - Difficulty-Beginner
- - Functional
 ---
 
 ## Intent

factory-method/README.md

@@ -5,8 +5,7 @@ folder: factory-method
 permalink: /patterns/factory-method/
 categories: Creational
 tags:
- - Java
+ - Extensibility
- - Difficulty-Beginner
  - Gang Of Four
 ---
 

feature-toggle/README.md

@@ -5,8 +5,7 @@ folder: feature-toggle
 permalink: /patterns/feature-toggle/
 categories: Behavioral
 tags:
- - Java
+ - Extensibility
- - Difficulty-Beginner
 ---
 
 ## Also known as

fluentinterface/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Fluent Interface
 folder: fluentinterface
 permalink: /patterns/fluentinterface/
-categories: Other
+categories: Functional
 tags: 
- - Java
+ - Reactive
- - Difficulty-Intermediate
- - Functional
 ---
 
 ## Intent

flux/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Flux
 folder: flux
 permalink: /patterns/flux/
-categories: Presentation Tier
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent

flyweight/README.md

@@ -5,9 +5,7 @@ folder: flyweight
 permalink: /patterns/flyweight/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
  - Performance
 ---
 

front-controller/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Front Controller
 folder: front-controller
 permalink: /patterns/front-controller/
-categories: Presentation Tier
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent

game-loop/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Game Loop 
 folder:  game-loop  
 permalink: /patterns/game-loop/  
-categories: Other  
+categories: Behavioral
 tags:  
- - Java  
+ - Game programming
- - Difficulty-Beginner  
 ---  
   
 ## Intent  

guarded-suspension/README.md

@@ -5,8 +5,7 @@ folder: guarded-suspension
 permalink: /patterns/guarded-suspension/
 categories: Concurrency
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent
@@ -19,4 +18,5 @@ Use Guarded suspension pattern to handle a situation when you want to execute a
 Use Guarded Suspension pattern when the developer knows that the method execution will be blocked for a finite period of time
 
 ## Related patterns
+
 * Balking 

half-sync-half-async/README.md

@@ -5,8 +5,7 @@ folder: half-sync-half-async
 permalink: /patterns/half-sync-half-async/
 categories: Concurrency
 tags:
- - Java
+ - Performance
- - Difficulty-Intermediate
 ---
 
 ## Intent

hexagonal/README.md

@@ -6,11 +6,11 @@ permalink: /patterns/hexagonal/
 pumlformat: svg
 categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Expert
 ---
 
 ## Also known as
+
 * Ports and Adapters
 * Clean Architecture
 * Onion Architecture
@@ -28,6 +28,7 @@ Use Hexagonal Architecture pattern when
 * When it is important that the application highly maintainable and fully testable
 
 ## Tutorials
+
 * [Build Maintainable Systems With Hexagonal Architecture](http://java-design-patterns.com/blog/build-maintainable-systems-with-hexagonal-architecture/)
 
 ## Real world examples

intercepting-filter/README.md

@@ -5,8 +5,7 @@ folder: intercepting-filter
 permalink: /patterns/intercepting-filter/
 categories: Behavioral
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -24,6 +23,7 @@ Use the Intercepting Filter pattern when
 * you want a modular approach to configuring pre-processing and post-processing schemes
 
 ## Tutorials
+
 * [Introduction to Intercepting Filter Pattern in Java](https://www.baeldung.com/intercepting-filter-pattern-in-java)
 
 ## Real world examples

interpreter/README.md

@@ -5,9 +5,7 @@ folder: interpreter
 permalink: /patterns/interpreter/
 categories: Behavioral
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -27,6 +25,7 @@ trees. The Interpreter pattern works best when
 * efficiency is not a critical concern. The most efficient interpreters are usually not implemented by interpreting parse trees directly but by first translating them into another form. For example, regular expressions are often transformed into state machines. But even then, the translator can be implemented by the Interpreter pattern, so the pattern is still applicable
 
 ## Real world examples
+
 * [java.util.Pattern](http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html)
 * [java.text.Normalizer](http://docs.oracle.com/javase/8/docs/api/java/text/Normalizer.html)
 * All subclasses of [java.text.Format](http://docs.oracle.com/javase/8/docs/api/java/text/Format.html)

iterator/README.md

@@ -5,8 +5,6 @@ folder: iterator
 permalink: /patterns/iterator/
 categories: Behavioral
 tags:
- - Java
- - Difficulty-Beginner
  - Gang Of Four
 ---
 

layers/README.md

@@ -6,9 +6,7 @@ permalink: /patterns/layers/
 pumlformat: svg
 categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
- - Spring
 ---
 
 ## Intent

lazy-loading/README.md

@@ -3,11 +3,8 @@ layout: pattern
 title: Lazy Loading
 folder: lazy-loading
 permalink: /patterns/lazy-loading/
-categories: Other
+categories: Idiom
 tags:
- - Java
- - Difficulty-Beginner
- - Idiom
  - Performance
 ---
 

leader-election/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Leader Election
 folder: leader-election
 permalink: /patterns/leader-election/
-categories: Other
+categories: Behavioral
 tags:
- - Java
+ - Cloud distributed
- - Difficulty-Beginner
 ---
 
 ## Intent

marker/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Marker Interface
 folder: marker
 permalink: /patterns/marker/
-categories: Other
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

master-worker-pattern/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Master-Worker
 folder: master-worker-pattern
 permalink: /patterns/master-worker-pattern/
-categories: Other
+categories: Concurrency
 tags:
- - Java
+ - Performance
- - Difficulty-Intermediate
 ---
 
 ## Also known as
@@ -27,5 +26,6 @@ This pattern can be used when data can be divided into multiple parts, all of wh
 In this pattern, parallel processing is performed using a system consisting of a master and some number of workers, where a master divides the work among the workers, gets the result back from them and assimilates all the results to give final result. The only communication is between the master and the worker - none of the workers communicate among one another and the user only communicates with the master to get the required job done. The master has to maintain a record of how the divided data has been distributed, how many workers have finished their work and returned a result, and the results themselves to be able to aggregate the data correctly.
 
 ## Credits
+
 * [https://docs.gigaspaces.com/sbp/master-worker-pattern.html]
 * [http://www.cs.sjsu.edu/~pearce/oom/patterns/behavioral/masterslave.htm]

mediator/README.md

@@ -5,9 +5,8 @@ folder: mediator
 permalink: /patterns/mediator/
 categories: Behavioral
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
+ - Decoupling
 ---
 
 ## Intent

memento/README.md

@@ -5,9 +5,7 @@ folder: memento
 permalink: /patterns/memento/
 categories: Behavioral
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Intermediate
 ---
 
 ## Also known as

model-view-controller/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Model-View-Controller
 folder: model-view-controller
 permalink: /patterns/model-view-controller/
-categories: Presentation Tier
+categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -21,7 +20,7 @@ display.
 ## Applicability
 Use the Model-View-Controller pattern when
 
-* you want to clearly separate the domain data from its user interface representation
+* You want to clearly separate the domain data from its user interface representation
 
 ## Credits
 

model-view-presenter/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Model-View-Presenter
 folder: model-view-presenter
 permalink: /patterns/model-view-presenter/
-categories: Presentation Tier
+categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -20,8 +19,8 @@ developers to build and test user interfaces.
 Use the Model-View-Presenter in any of the following
 situations
 
-* when you want to improve the "Separation of Concerns" principle in presentation logic
+* When you want to improve the "Separation of Concerns" principle in presentation logic
-* when a user interface development and testing is necessary.
+* When a user interface development and testing is necessary.
 
 ## Real world examples
 

module/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Module
 folder: module
 permalink: /patterns/module/
-categories: Creational Pattern
+categories: Structural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

monad/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Monad
 folder: monad
 permalink: /patterns/monad/
-categories: Other
+categories: Functional
 tags:
- - Java
+ - Reactive
- - Difficulty-Expert
- - Functional
 ---
 
 ## Intent
@@ -26,8 +24,8 @@ return - that takes plain type object and returns this object wrapped in a monad
 
 Use the Monad in any of the following situations
 
-* when you want to chain operations easily
+* When you want to chain operations easily
-* when you want to apply each function regardless of the result of any of them
+* When you want to apply each function regardless of the result of any of them
 
 ## Credits
 

monostate/README.md

@@ -5,8 +5,7 @@ folder: monostate
 permalink: /patterns/monostate/
 categories: Creational
 tags:
- - Java
+ - Instantiation
- - Difficulty-Beginner
 ---
 
 ## Also known as
@@ -27,9 +26,9 @@ Use the Monostate pattern when
 
 ## Typical Use Case
 
-* the logging class
+* The logging class
-* managing a connection to a database
+* Managing a connection to a database
-* file manager
+* File manager
 
 ## Real world examples
 

multiton/README.md

@@ -5,8 +5,7 @@ folder: multiton
 permalink: /patterns/multiton/
 categories: Creational
 tags:
- - Java
+ - Instantiation
- - Difficulty-Beginner
 ---
 
 ## Also known as

mute-idiom/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Mute Idiom
 folder: mute-idiom
 permalink: /patterns/mute-idiom/
-categories: Other
+categories: Idiom
 tags: 
- - Java
+ - Decoupling
- - Difficulty-Beginner
- - Idiom
 ---
 
 ## Intent

mutex/README.md

@@ -5,13 +5,13 @@ folder: mutex
 permalink: /patterns/mutex/
 categories: Concurrency
 tags: 
- - Java
+ - Decoupling
- - Difficulty-Intermediate
 ---
 
 ## Also known as
-Mutual Exclusion Lock
+
-Binary Semaphore
+* Mutual Exclusion Lock
+* Binary Semaphore
 
 ## Intent
 Create a lock which only allows a single thread to access a resource at any one instant.
@@ -22,8 +22,8 @@ Create a lock which only allows a single thread to access a resource at any one
 ## Applicability
 Use a Mutex when
 
-* you need to prevent two threads accessing a critical section at the same time
+* You need to prevent two threads accessing a critical section at the same time
-* concurrent access to a resource could lead to a race condition 
+* Concurrent access to a resource could lead to a race condition 
 
 ## Credits
 

naked-objects/README.md

@@ -5,8 +5,7 @@ folder: naked-objects
 permalink: /patterns/naked-objects/
 categories: Architectural
 tags:
- - Java
+ - Decoupling
- - Difficulty-Expert
 ---
 
 ## Intent
@@ -20,9 +19,9 @@ everything else is autogenerated by the framework.
 ## Applicability
 Use the Naked Objects pattern when
 
-* you are prototyping and need fast development cycle
+* You are prototyping and need fast development cycle
-* an autogenerated user interface is good enough
+* An autogenerated user interface is good enough
-* you want to automatically publish the domain as REST services
+* You want to automatically publish the domain as REST services
 
 ## Real world examples
 

null-object/README.md

@@ -5,8 +5,7 @@ folder: null-object
 permalink: /patterns/null-object/
 categories: Behavioral
 tags:
- - Java
+ - Extensibility
- - Difficulty-Beginner
 ---
 
 ## Intent
@@ -25,7 +24,8 @@ Object is very predictable and has no side effects: it does nothing.
 ## Applicability
 Use the Null Object pattern when
 
-* you want to avoid explicit null checks and keep the algorithm elegant and easy to read.
+* You want to avoid explicit null checks and keep the algorithm elegant and easy to read.
 
 ## Credits
+
 * [Pattern Languages of Program Design](http://www.amazon.com/Pattern-Languages-Program-Design-Coplien/dp/0201607344/ref=sr_1_1)

object-mother/README.md

@@ -5,8 +5,7 @@ folder: object-mother
 permalink: /patterns/object-mother/
 categories: Creational
 tags:
- - Java
+ - Instantiation
- - Difficulty-Beginner
 ---
 
 ## Object Mother
@@ -19,13 +18,11 @@ Define a factory of immutable content with separated builder and factory interfa
 Use the Object Mother pattern when
 
 * You want consistent objects over several tests
-* you want to reduce code for creation of objects in tests
+* You want to reduce code for creation of objects in tests
-* every test should run with fresh data
+* Every test should run with fresh data
 
 ## Credits
 
 * [Answer by David Brown](http://stackoverflow.com/questions/923319/what-is-an-objectmother) to the stackoverflow question: [What is an ObjectMother?](http://stackoverflow.com/questions/923319/what-is-an-objectmother)
-
 * [c2wiki - Object Mother](http://c2.com/cgi/wiki?ObjectMother)
-
 * [Nat Pryce - Test Data Builders: an alternative to the Object Mother pattern](http://www.natpryce.com/articles/000714.html)

object-pool/README.md

@@ -5,8 +5,7 @@ folder: object-pool
 permalink: /patterns/object-pool/
 categories: Creational
 tags:
- - Java
+ - Game programming
- - Difficulty-Beginner
  - Performance
 ---
 
@@ -22,5 +21,5 @@ are in use and which are available.
 ## Applicability
 Use the Object Pool pattern when
 
-* the objects are expensive to create (allocation cost)
+* The objects are expensive to create (allocation cost)
-* you need a large number of short-lived objects (memory fragmentation)
+* You need a large number of short-lived objects (memory fragmentation)

observer/README.md

@@ -5,8 +5,6 @@ folder: observer
 permalink: /patterns/observer/
 categories: Behavioral
 tags:
- - Java
- - Difficulty-Beginner
  - Gang Of Four
  - Reactive
 ---
@@ -25,13 +23,13 @@ automatically.
 ## Applicability
 Use the Observer pattern in any of the following situations
 
-* when an abstraction has two aspects, one dependent on the other. Encapsulating these aspects in separate objects lets you vary and reuse them independently
+* When an abstraction has two aspects, one dependent on the other. Encapsulating these aspects in separate objects lets you vary and reuse them independently
-* when a change to one object requires changing others, and you don't know how many objects need to be changed
+* When a change to one object requires changing others, and you don't know how many objects need to be changed
-* when an object should be able to notify other objects without making assumptions about who these objects are. In other words, you don't want these objects tightly coupled
+* When an object should be able to notify other objects without making assumptions about who these objects are. In other words, you don't want these objects tightly coupled
 
 ## Typical Use Case
 
-* changing in one object leads to a change in other objects
+* Changing in one object leads to a change in other objects
 
 ## Real world examples
 

page-object/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Page Object
 folder: page-object
 permalink: /patterns/page-object/
-categories: Testing
+categories: Structural
 tags:
-- Java
+- Decoupling
-- Difficulty-Intermediate
 ---
 
 ## Intent

partial-response/README.md

@@ -3,12 +3,9 @@ layout: pattern
 title: Partial Response
 folder: partial-response
 permalink: /patterns/partial-response/
-categories: Architectural
+categories: Behavioral
 tags:
- - Java
+ - Decoupling
- - KISS
- - YAGNI
- - Difficulty-Beginner
 ---
 
 ## Intent

pipeline/README.md

@@ -5,9 +5,7 @@ folder: pipeline
 permalink: /patterns/pipeline/
 categories: Behavioral
 tags:
- - Java
+ - Decoupling
- - Functional
- - Difficulty-Intermediate
 ---
 
 ## Intent
@@ -19,13 +17,13 @@ Allows processing of data in a series of stages by giving in an initial input an
 ## Applicability
 Use the Pipeline pattern when you want to
 
-* execute individual stages that yields a final value
+* Execute individual stages that yields a final value
-* add readability to complex sequence of operations by providing a fluent builder as an interface
+* Add readability to complex sequence of operations by providing a fluent builder as an interface
-* improve testability of code since stages will most likely be doing a single thing, complying to the [Single Responsibility Principle (SRP)](https://java-design-patterns.com/principles/#single-responsibility-principle)
+* Improve testability of code since stages will most likely be doing a single thing, complying to the [Single Responsibility Principle (SRP)](https://java-design-patterns.com/principles/#single-responsibility-principle)
 
 ## Typical Use Case
 
-* implement stages and execute them in an ordered manner
+* Implement stages and execute them in an ordered manner
 
 ## Real world examples
 

poison-pill/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Poison Pill
 folder: poison-pill
 permalink: /patterns/poison-pill/
-categories: Other
+categories: Behavioral
 tags:
- - Java
+ - Cloud distributed
- - Difficulty-Intermediate
  - Reactive
 ---
 
@@ -20,7 +19,7 @@ graceful shutdown for separate distributed consumption process.
 ## Applicability
 Use the Poison Pill idiom when
 
-* need to send signal from one thread/process to another to terminate
+* Need to send signal from one thread/process to another to terminate
 
 ## Real world examples
 

priority-queue/README.md

@@ -5,8 +5,7 @@ folder: priority-queue
 permalink: /patterns/priority-queue/
 categories: Behavioral
 tags:
- - Java
+ - Decoupling
- - Difficulty-Beginner
 ---
 
 ## Intent

private-class-data/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Private Class Data
 folder: private-class-data
 permalink: /patterns/private-class-data/
-categories: Other
+categories: Idiom
 tags:
- - Java
+ - Data access
- - Difficulty-Beginner
- - Idiom
 ---
 
 ## Intent
@@ -21,4 +19,4 @@ attributes by encapsulating them in single Data object.
 ## Applicability
 Use the Private Class Data pattern when
 
-* you want to prevent write access to class data members
+* You want to prevent write access to class data members

producer-consumer/README.md

@@ -5,9 +5,6 @@ folder: producer-consumer
 permalink: /patterns/producer-consumer/
 categories: Concurrency
 tags:
- - Java
- - Difficulty-Intermediate
- - I/O
  - Reactive
 ---
 
@@ -22,5 +19,5 @@ Producer Consumer Design pattern is a classic concurrency pattern which reduces
 ## Applicability
 Use the Producer Consumer idiom when
 
-* decouple system by separate work in two process produce and consume.
+* Decouple system by separate work in two process produce and consume.
-* addresses the issue of different timing require to produce work or consuming work
+* Addresses the issue of different timing require to produce work or consuming work

promise/README.md

@@ -5,10 +5,7 @@ folder: promise
 permalink: /patterns/promise/
 categories: Concurrency
 tags:
- - Java
- - Functional
  - Reactive
- - Difficulty-Intermediate
 ---
 
 ## Also known as
@@ -27,9 +24,9 @@ in a synchronous way.
 Promise pattern is applicable in concurrent programming when some work needs to be done asynchronously
 and:
 
-* code maintainability and readability suffers due to callback hell.
+* Code maintainability and readability suffers due to callback hell.
-* you need to compose promises and need better error handling for asynchronous tasks.
+* You need to compose promises and need better error handling for asynchronous tasks.
-* you want to use functional style of programming.
+* You want to use functional style of programming.
 
 
 ## Real world examples

property/README.md

@@ -5,8 +5,7 @@ folder: property
 permalink: /patterns/property/
 categories: Creational
 tags:
- - Java
+ - Instantiation
- - Difficulty-Beginner
 ---
 
 ## Intent
@@ -19,7 +18,7 @@ objects as parents.
 ## Applicability
 Use the Property pattern when
 
-* when you like to have objects with dynamic set of fields and prototype inheritance
+* When you like to have objects with dynamic set of fields and prototype inheritance
 
 ## Real world examples
 

prototype/README.md

@@ -5,9 +5,8 @@ folder: prototype
 permalink: /patterns/prototype/
 categories: Creational
 tags: 
- - Java
  - Gang Of Four
- - Difficulty-Beginner
+ - Instantiation
 ---
 
 ## Intent
@@ -68,10 +67,10 @@ System.out.println(cloned.getName()); // Dolly
 ## Applicability
 Use the Prototype pattern when a system should be independent of how its products are created, composed and represented; and
 
-* when the classes to instantiate are specified at run-time, for example, by dynamic loading
+* When the classes to instantiate are specified at run-time, for example, by dynamic loading
-* to avoid building a class hierarchy of factories that parallels the class hierarchy of products
+* To avoid building a class hierarchy of factories that parallels the class hierarchy of products
-* when instances of a class can have one of only a few different combinations of state. It may be more convenient to install a corresponding number of prototypes and clone them rather than instantiating the class manually, each time with the appropriate state
+* When instances of a class can have one of only a few different combinations of state. It may be more convenient to install a corresponding number of prototypes and clone them rather than instantiating the class manually, each time with the appropriate state
-* when object creation is expensive compared to cloning
+* When object creation is expensive compared to cloning
 
 ## Real world examples
 

proxy/README.md

@@ -5,9 +5,8 @@ folder: proxy
 permalink: /patterns/proxy/
 categories: Structural
 tags:
- - Java
  - Gang Of Four
- - Difficulty-Beginner
+ - Decoupling
 ---
 
 ## Also known as
@@ -130,6 +129,7 @@ are several common situations in which the Proxy pattern is applicable
 * Count references to an object
 
 ## Tutorials
+
 * [Controlling Access With Proxy Pattern](http://java-design-patterns.com/blog/controlling-access-with-proxy-pattern/)
 
 ## Real world examples

queue-load-leveling/README.md

@@ -3,10 +3,9 @@ layout: pattern
 title: Queue based load leveling
 folder: queue-load-leveling
 permalink: /patterns/queue-load-leveling/
-categories: Other
+categories: Concurrency
 tags:
- - Java
+ - Decoupling
- - Difficulty-Intermediate
  - Performance
 ---
 

reactor/README.md

@@ -6,9 +6,8 @@ permalink: /patterns/reactor/
 pumlformat: svg
 categories: Concurrency
 tags:
- - Java
+ - Performance
- - Difficulty-Expert
+ - Reactive
- - I/O
 ---
 
 ## Intent
@@ -20,9 +19,9 @@ The Reactor design pattern handles service requests that are delivered concurren
 ## Applicability
 Use Reactor pattern when
 
-* a server application needs to handle concurrent service requests from multiple clients.
+* A server application needs to handle concurrent service requests from multiple clients.
-* a server application needs to be available for receiving requests from new clients even when handling older client requests.
+* A server application needs to be available for receiving requests from new clients even when handling older client requests.
-* a server must maximize throughput, minimize latency and use CPU efficiently without blocking.
+* A server must maximize throughput, minimize latency and use CPU efficiently without blocking.
 
 ## Real world examples
 

reader-writer-lock/README.md

@@ -5,9 +5,6 @@ folder: reader-writer-lock
 permalink: /patterns/reader-writer-lock/
 categories: Concurrency
 tags: 
- - Java
- - Difficulty-Intermediate
- - I/O
  - Performance
 ---
 
@@ -29,5 +26,4 @@ Application need to  increase the performance of resource synchronize for multip
 ## Credits
 
 * [Readers–writer lock](https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock)
-
+* [Readers–writers_problem](https://en.wikipedia.org/wiki/Readers%E2%80%93writers_problem)
-* [Readers–writers_problem](https://en.wikipedia.org/wiki/Readers%E2%80%93writers_problem)

repository/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Repository
 folder: repository
 permalink: /patterns/repository/
-categories: Persistence Tier
+categories: Architectural
 tags:
- - Java
+ - Data access
- - Difficulty-Intermediate
- - Spring
 ---
 
 ## Intent
@@ -23,10 +21,10 @@ querying is utilized.
 ## Applicability
 Use the Repository pattern when
 
-* the number of domain objects is large
+* The number of domain objects is large
-* you want to avoid duplication of query code
+* You want to avoid duplication of query code
-* you want to keep the database querying code in single place
+* You want to keep the database querying code in single place
-* you have multiple data sources
+* You have multiple data sources
 
 ## Real world examples
 

resource-acquisition-is-initialization/README.md

@@ -3,11 +3,9 @@ layout: pattern
 title: Resource Acquisition Is Initialization
 folder: resource-acquisition-is-initialization
 permalink: /patterns/resource-acquisition-is-initialization/
-categories: Other
+categories: Idiom
 tags:
- - Java
+ - Data access
- - Difficulty-Beginner
- - Idiom
 ---
 
 ## Intent
@@ -19,4 +17,4 @@ Resource Acquisition Is Initialization pattern can be used to implement exceptio
 ## Applicability
 Use the Resource Acquisition Is Initialization pattern when
 
-* you have resources that must be closed in every condition
+* You have resources that must be closed in every condition

retry/README.md

@@ -3,10 +3,8 @@ layout: pattern
 title: Retry
 folder: retry
 permalink: /patterns/retry/
-categories: Other
+categories: Behavioral
 tags:
-  - Java
-  - Difficulty-Expert
   - Performance
 ---
 
@@ -151,4 +149,5 @@ You can view Microsoft's article [here](https://docs.microsoft.com/en-us/azure/a
 * Operations maintenance
 
 ## Related Patterns
+
 * [Circuit Breaker](https://martinfowler.com/bliki/CircuitBreaker.html)