#352- Unit Of Work : added the readme file

unit-of-work/README.md

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+---
+layout: pattern
+title: Unit Of Work
+folder: unit-of-work
+permalink: /patterns/unit-of-work/
+pumlid: 
+categories: Architectural
+tags:
+ - Java
+ - KISS
+ - YAGNI
+ - Difficulty-Beginner
+---
+
+## Intent
+When a business transaction is completed all the these updates are sent as one 
+  big unit of work to be persisted in a database in one go so as to minimize database trips. 
+
+![alt text](etc/unit-of-work.urm.png "unit-of-work")
+
+## Applicability
+Use the Unit Of Work pattern when
+
+* The client is asking to optimize the time taken for database transactions.
+* When you want to boost the performance to get database records.
+* You want reduce number of database calls.
+
+## Credits
+
+* [Design Pattern - Unit Of Work Pattern](https://www.codeproject.com/Articles/581487/Unit-of-Work-Design-Pattern)
+* [Unit Of Work](https://martinfowler.com/eaaCatalog/unitOfWork.html)

unit-of-work/etc/unit-of-work.ucls

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+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.2.0" icons="true" always-add-relationships="false" generalizations="true" realizations="true" 
+  associations="true" dependencies="false" nesting-relationships="true" router="FAN">  
+  <class id="1" language="java" name="com.iluwatar.datatransfer.CustomerClientApp" project="data-transfer-object" 
+    file="/data-transfer-object/src/main/java/com/iluwatar/datatransfer/CustomerClientApp.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="145" y="93"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="2" language="java" name="com.iluwatar.datatransfer.CustomerDto" project="data-transfer-object" 
+    file="/data-transfer-object/src/main/java/com/iluwatar/datatransfer/CustomerDto.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="386" y="329"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="3" language="java" name="com.iluwatar.datatransfer.CustomerResource" project="data-transfer-object" 
+    file="/data-transfer-object/src/main/java/com/iluwatar/datatransfer/CustomerResource.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="677" y="93"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <association id="4">    
+    <end type="SOURCE" refId="3" navigable="false">      
+      <attribute id="5" name="customers"/>      
+      <multiplicity id="6" minimum="0" maximum="2147483647"/>    
+    </end>    
+    <end type="TARGET" refId="2" navigable="true"/>    
+    <display labels="true" multiplicity="true"/>  
+  </association>  
+  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+    sort-features="false" accessors="true" visibility="true">    
+    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
+    <operations public="true" package="true" protected="true" private="true" static="true"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>