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daniel-bryla 0a427710bb Merge branch 'master' of https://github.com/iluwatar/java-design-patterns

* 'master' of https://github.com/iluwatar/java-design-patterns: (27 commits)
  Remove use of coveralls-maven-plugin (sonarqube.com covers this)
  Add SonarQube.com badge
  Fix environment variable
  Add Travis instructions for SonarQube.com analysis
  Adds more criticism to Singleton pattern.
  Event Based Asynchronous pattern: Add missing license header and puml diagram
  Changed config to non-interactive
  Moved config into a separate dir
  Unused import removed.
  End process logic clause has been corrected.
  Caching pattern: Documentation and diagram
  Fixes #437. Adds criticism to Singleton pattern.
  Alter JUnit tests to run in lesser time.
  Updated version snapshot to 1.14.0
  Changes based on review feedback.
  Closes #436. Adds criticism to service locator pattern.
  Caching pattern: Implementation of Cache-Aside pattern
  Caching pattern: Style fix for null check
  Caching pattern: Refactor LRU cache to avoid NPE and unnecessary cache lookup
  Caching pattern: Refactor shutdown hook to use method reference
  ...

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_scripts

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abstract-document

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abstract-factory

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api-gateway

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async-method-invocation

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bridge

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builder

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business-delegate

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caching

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callback

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chain

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command

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composite

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dao

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delegation

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dependency-injection

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double-dispatch

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event-aggregator

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event-asynchronous

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multiton

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producer-consumer

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promise

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repository

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resource-acquisition-is-initialization

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semaphore

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servant

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service-locator

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singleton

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specification

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strategy

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.gitignore

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.travis.yml

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checkstyle-suppressions.xml

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checkstyle.xml

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CODE_COVERAGE.md

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CONTRIBUTING.MD

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exclude-pmd.properties

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faq.md

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LICENSE.md

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pom.xml

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README.md

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update-ghpages.sh

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README.md

Design patterns implemented in Java

Introduction

Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.

Design patterns can speed up the development process by providing tested, proven development paradigms.

Reusing design patterns helps to prevent subtle issues that can cause major problems, and it also improves code readability for coders and architects who are familiar with the patterns.

Getting started

Before you dive into the material, you should be familiar with various Programming/Software Design Principles.

All designs should be as simple as possible. You should start with KISS, YAGNI, and Do The Simplest Thing That Could Possibly Work principles. Complexity and patterns should only be introduced when they are needed for practical extensibility.

Once you are familiar with these concepts you can start drilling down into patterns by any of the following approaches

Using difficulty tags, Difficulty-Beginner, Difficulty-Intermediate & Difficulty-Expert.
Using pattern categories, Creational, Behavioral and others.
Search for a specific pattern. Can't find one? Please report a new pattern here.

How to contribute

If you are willing to contribute to the project you will find the relevant information in our developer wiki. We will help you and answer your questions in the Gitter chatroom.

License

This project is licensed under the terms of the MIT license.