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
  ...

service-locator/README.md

@@ -33,6 +33,12 @@ improves the performance of application to great extent.
 * lookups of services are done quite frequently
 * large number of services are being used
 
+## Consequences
+
+* Violates Interface Segregation Principle (ISP) by providing pattern consumers with an access 
+to a number of services that they don't potentially need.
+* Creates hidden dependencies that can break the clients at runtime.
+
 ## Credits
 
 * [J2EE Design Patterns](http://www.amazon.com/J2EE-Design-Patterns-William-Crawford/dp/0596004273/ref=sr_1_2)