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Commit2ff7818

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Work oniluwatar#74, added class diagram and index.md
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‎reactor/etc/reactor.png

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‎reactor/etc/reactor.ucls

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<?xml version="1.0" encoding="UTF-8"?>
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<class-diagramversion="1.1.8"icons="true"automaticImage="PNG"always-add-relationships="false"generalizations="true"
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realizations="true"associations="true"dependencies="true"nesting-relationships="true">
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<classid="1"language="java"name="java.nio.channels.Selector"project="abstract-factory"
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file="/opt/Softwares/Eclipses/MARS/eclipse/jre/lib/rt.jar"binary="true"corner="BOTTOM_RIGHT">
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<positionheight="224"width="188"x="1120"y="-50"/>
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<displayautosize="false"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="false"private="true"static="true"/>
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</display>
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</class>
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<classid="2"language="java"name="com.iluwatar.reactor.framework.NioReactor"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/NioReactor.java"binary="false"corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="760"y="19"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="false"static="true"/>
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</display>
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</class>
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<interfaceid="3"language="java"name="com.iluwatar.reactor.framework.Dispatcher"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/Dispatcher.java"binary="false"corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="569"y="279"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</interface>
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<classid="4"language="java"name="com.iluwatar.reactor.framework.SameThreadDispatcher"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/SameThreadDispatcher.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="291"y="562"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="5"language="java"name="com.iluwatar.reactor.framework.ThreadPoolDispatcher"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/ThreadPoolDispatcher.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="115"width="356"x="341"y="375"/>
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<displayautosize="false"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="6"language="java"name="com.iluwatar.reactor.framework.AbstractNioChannel"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/AbstractNioChannel.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="935"y="265"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="false"static="true"/>
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</display>
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</class>
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<classid="7"language="java"name="com.iluwatar.reactor.framework.NioServerSocketChannel"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/NioServerSocketChannel.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="836"y="543"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="8"language="java"name="com.iluwatar.reactor.framework.NioDatagramChannel"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/NioDatagramChannel.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="1110"y="539"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</class>
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<classid="9"language="java"name="java.nio.channels.ServerSocketChannel"project="abstract-factory"
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file="/opt/Softwares/Eclipses/MARS/eclipse/jre/lib/rt.jar"binary="true"corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="609"y="540"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="false"protected="true"private="false"static="true"/>
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<operationspublic="false"package="true"protected="false"private="true"static="true"/>
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</display>
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</class>
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<classid="10"language="java"name="java.nio.channels.DatagramChannel"project="abstract-factory"
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file="/opt/Softwares/Eclipses/MARS/eclipse/jre/lib/rt.jar"binary="true"corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="1202"y="395"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="false"package="true"protected="false"private="true"static="true"/>
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</display>
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</class>
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<interfaceid="11"language="java"name="com.iluwatar.reactor.framework.ChannelHandler"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/framework/ChannelHandler.java"binary="false"
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corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="303"y="-1"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</display>
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</interface>
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<classid="12"language="java"name="com.iluwatar.reactor.app.LoggingHandler"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/app/LoggingHandler.java"binary="false"corner="BOTTOM_RIGHT">
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<positionheight="-1"width="-1"x="297"y="147"/>
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<displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="false"static="true"/>
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</display>
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</class>
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<classid="13"language="java"name="com.iluwatar.reactor.app.App"project="reactor"
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file="/reactor/src/main/java/com/iluwatar/reactor/app/App.java"binary="false"corner="BOTTOM_RIGHT">
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<positionheight="133"width="148"x="123"y="266"/>
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<displayautosize="false"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="false"static="true"/>
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<operationspublic="true"package="true"protected="true"private="false"static="true"/>
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</display>
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</class>
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<realizationid="14">
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<endtype="SOURCE"refId="5"/>
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<endtype="TARGET"refId="3"/>
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</realization>
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<associationid="15">
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<endtype="SOURCE"refId="2"navigable="false">
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<attributeid="16"name="dispatcher"/>
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<multiplicityid="17"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="3"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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<endtype="TARGET"refId="3"/>
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</realization>
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<associationid="19">
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<bendpointx="460"y="203"/>
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<endtype="SOURCE"refId="13"navigable="false">
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<attributeid="20"name="reactor"/>
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<multiplicityid="21"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="2"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<dependencyid="22">
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<endtype="SOURCE"refId="8"/>
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<endtype="TARGET"refId="10"/>
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</dependency>
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<generalizationid="23">
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<endtype="SOURCE"refId="7"/>
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<endtype="TARGET"refId="6"/>
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</generalization>
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<associationid="24">
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<endtype="SOURCE"refId="6"navigable="false">
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<attributeid="25"name="handler"/>
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<multiplicityid="26"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="11"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<associationid="27">
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<endtype="SOURCE"refId="6"navigable="false">
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<attributeid="28"name="reactor"/>
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<multiplicityid="29"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="2"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<dependencyid="30">
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<endtype="SOURCE"refId="13"/>
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<endtype="TARGET"refId="12"/>
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</dependency>
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<associationid="31">
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<endtype="SOURCE"refId="2"navigable="false">
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<attributeid="32"name="selector"/>
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<multiplicityid="33"minimum="0"maximum="1"/>
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</end>
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<endtype="TARGET"refId="1"navigable="true"/>
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<displaylabels="true"multiplicity="true"/>
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</association>
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<realizationid="34">
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<endtype="SOURCE"refId="12"/>
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<endtype="TARGET"refId="11"/>
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</realization>
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<generalizationid="35">
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<endtype="SOURCE"refId="8"/>
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<endtype="TARGET"refId="6"/>
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</generalization>
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<dependencyid="36">
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<endtype="SOURCE"refId="7"/>
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<endtype="TARGET"refId="9"/>
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</dependency>
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<classifier-displayautosize="true"stereotype="true"package="true"initial-value="false"signature="true"
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sort-features="false"accessors="true"visibility="true">
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<attributespublic="true"package="true"protected="true"private="true"static="true"/>
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<operationspublic="true"package="true"protected="true"private="true"static="true"/>
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</classifier-display>
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<association-displaylabels="true"multiplicity="true"/>
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</class-diagram>

‎reactor/index.md

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---
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layout:pattern
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title:Reactor
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folder:reactor
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permalink:/patterns/reactor/
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categories:Architectural
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tags:
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-Java
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-Difficulty-Expert
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---
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**Intent:** The Reactor design pattern handles service requests that are delivered concurrently to an application by one or more clients. The application can register specific handlers for processing which are called by reactor on specific events. Dispatching of event handlers is performed by an initiation dispatcher, which manages the registered event handlers. Demultiplexing of service requests is performed by a synchronous event demultiplexer.
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![Reactor](./etc/reactor.png"Reactor")
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**Applicability:** Use Reactor pattern when
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* a server application needs to handle concurrent service requests from multiple clients.
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* a server application needs to be available for receiving requests from new clients even when handling older client requests.
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* a server must maximize throughput, minimize latency and use CPU efficiently without blocking.
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**Real world examples:**
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*[Spring Reactor](http://projectreactor.io/)
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**Credits**
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*[Douglas C. Schmidt - Reactor](https://www.dre.vanderbilt.edu/~schmidt/PDF/Reactor.pdf)
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*[Doug Lea - Scalable IO in Java](http://gee.cs.oswego.edu/dl/cpjslides/nio.pdf)
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*[Netty](http://netty.io/)

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