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Work on iluwatar#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-diagram version="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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<class id="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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<operations public="true" package="true" protected="false" private="true" static="true"/>
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</display>
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</class>
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<class id="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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<operations public="true" package="true" protected="true" private="false" static="true"/>
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</display>
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</class>
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<interface id="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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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</interface>
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<class id="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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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="true" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</class>
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<class id="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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sort-features="false" accessors="true" visibility="true">
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<attributes public="true" package="true" protected="true" private="false" static="true"/>
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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</class>
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<class id="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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<operations public="true" package="true" protected="true" private="false" static="true"/>
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</class>
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<class id="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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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</class>
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<class id="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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</class>
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<class id="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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</class>
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<class id="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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</class>
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<interface id="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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<operations public="true" package="true" protected="true" private="true" static="true"/>
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</display>
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</interface>
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<class id="12" language="java" name="com.iluwatar.reactor.app.LoggingHandler" project="reactor"
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<operations public="true" package="true" protected="true" private="false" static="true"/>
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</display>
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</class>
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<class id="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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</class>
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<dependency id="22">
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<attribute id="28" name="reactor"/>
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</end>
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<dependency id="30">
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<dependency id="36">
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</dependency>
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sort-features="false" accessors="true" visibility="true">
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</classifier-display>
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<association-display labels="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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