Merge pull request #227 from iluwatar/message-channel
Message Channel EIP
This commit is contained in:
commit
e33d037c0f
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message-channel/.gitignore
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message-channel/.gitignore
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/target/
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message-channel/etc/message-channel.png
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message-channel/etc/message-channel.png
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message-channel/etc/message-channel.ucls
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message-channel/etc/message-channel.ucls
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<?xml version="1.0" encoding="UTF-8"?>
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||||||
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<class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true"
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||||||
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realizations="true" associations="true" dependencies="false" nesting-relationships="true">
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||||||
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<class id="1" language="java" name="org.apache.camel.builder.RouteBuilder" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="920" y="458"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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</display>
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</class>
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||||||
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<interface id="2" language="java" name="org.apache.camel.CamelContext" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="674" y="458"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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</interface>
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||||||
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<class id="3" language="java" name="org.apache.camel.model.RouteDefinition" project="message-channel"
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="673" y="48"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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</display>
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</class>
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<class id="4" language="java" name="org.apache.camel.model.ProcessorDefinition" project="message-channel"
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="673" y="-96"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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</class>
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||||||
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<class id="5" language="java" name="org.apache.camel.model.OptionalIdentifiedDefinition" project="message-channel"
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="248" y="-96"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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</display>
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</class>
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<interface id="6" language="java" name="org.apache.camel.NamedNode" project="message-channel"
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="249" y="0"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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</display>
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</interface>
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<interface id="7" language="java" name="org.apache.camel.model.Block" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="464" y="13"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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</display>
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</interface>
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||||||
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<interface id="8" language="java" name="org.apache.camel.RoutesBuilder" project="message-channel"
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="920" y="590"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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</interface>
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||||||
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<class id="9" language="java" name="org.apache.camel.builder.BuilderSupport" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="920" y="297"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</class>
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||||||
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<interface id="10" language="java" name="org.apache.camel.SuspendableService" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="267" y="458"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<interface id="11" language="java" name="org.apache.camel.Service" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="267" y="297"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<interface id="12" language="java" name="org.apache.camel.RuntimeConfiguration" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="674" y="590"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<class id="13" language="java" name="org.apache.camel.impl.DefaultCamelContext" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="673" y="167"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</class>
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||||||
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<class id="14" language="java" name="org.apache.camel.support.ServiceSupport" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="265" y="91"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</class>
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||||||
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<interface id="15" language="java" name="org.apache.camel.StatefulService" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="5" y="188"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<interface id="16" language="java" name="org.apache.camel.ShutdownableService" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="265" y="188"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<interface id="17" language="java" name="org.apache.camel.model.ModelCamelContext" project="message-channel"
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||||||
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file="C:/Users/ilkka/.m2/repository/org/apache/camel/camel-core/2.15.3/camel-core-2.15.3.jar" binary="true"
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||||||
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corner="BOTTOM_RIGHT">
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||||||
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<position height="-1" width="-1" x="674" y="297"/>
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||||||
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<display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
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||||||
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sort-features="false" accessors="true" visibility="true">
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||||||
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<attributes public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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<operations public="false" package="false" protected="false" private="false" static="true"/>
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||||||
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</display>
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||||||
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</interface>
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||||||
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<generalization id="18">
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||||||
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||||||
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||||||
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</generalization>
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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</realization>
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||||||
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<association id="21">
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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|
||||||
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||||||
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||||||
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||||||
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|
||||||
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||||||
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|
||||||
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||||||
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||||||
|
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||||||
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|
||||||
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||||||
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|
||||||
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||||||
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|
||||||
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|
||||||
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|
||||||
|
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|
||||||
|
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||||||
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||||||
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||||||
|
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||||||
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|
||||||
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|
||||||
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|
||||||
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|
||||||
|
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|
||||||
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|
||||||
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|
||||||
|
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|
||||||
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
<display labels="true" multiplicity="true"/>
|
||||||
|
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|
||||||
|
<realization id="43">
|
||||||
|
<end type="SOURCE" refId="5"/>
|
||||||
|
<end type="TARGET" refId="6"/>
|
||||||
|
</realization>
|
||||||
|
<generalization id="44">
|
||||||
|
<end type="SOURCE" refId="2"/>
|
||||||
|
<end type="TARGET" refId="12"/>
|
||||||
|
</generalization>
|
||||||
|
<generalization id="45">
|
||||||
|
<end type="SOURCE" refId="13"/>
|
||||||
|
<end type="TARGET" refId="14"/>
|
||||||
|
</generalization>
|
||||||
|
<association id="46">
|
||||||
|
<end type="SOURCE" refId="3" navigable="false">
|
||||||
|
<attribute id="47" name="outputs">
|
||||||
|
<position height="0" width="0" x="329" y="-461"/>
|
||||||
|
</attribute>
|
||||||
|
<multiplicity id="48" minimum="0" maximum="2147483647">
|
||||||
|
<position height="0" width="0" x="329" y="-461"/>
|
||||||
|
</multiplicity>
|
||||||
|
</end>
|
||||||
|
<end type="TARGET" refId="4" navigable="true"/>
|
||||||
|
<display labels="true" multiplicity="true"/>
|
||||||
|
</association>
|
||||||
|
<association id="49">
|
||||||
|
<end type="SOURCE" refId="13" navigable="false">
|
||||||
|
<attribute id="50" name="routeDefinitions">
|
||||||
|
<position height="0" width="0" x="291" y="-218"/>
|
||||||
|
</attribute>
|
||||||
|
<multiplicity id="51" minimum="0" maximum="2147483647">
|
||||||
|
<position height="0" width="0" x="291" y="-218"/>
|
||||||
|
</multiplicity>
|
||||||
|
</end>
|
||||||
|
<end type="TARGET" refId="3" navigable="true"/>
|
||||||
|
<display labels="true" multiplicity="true"/>
|
||||||
|
</association>
|
||||||
|
<realization id="52">
|
||||||
|
<end type="SOURCE" refId="13"/>
|
||||||
|
<end type="TARGET" refId="10"/>
|
||||||
|
</realization>
|
||||||
|
<classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true"
|
||||||
|
sort-features="false" accessors="true" visibility="true">
|
||||||
|
<attributes public="false" package="false" protected="false" private="false" static="true"/>
|
||||||
|
<operations public="false" package="false" protected="false" private="false" static="true"/>
|
||||||
|
</classifier-display>
|
||||||
|
<association-display labels="true" multiplicity="true"/>
|
||||||
|
</class-diagram>
|
21
message-channel/index.md
Normal file
21
message-channel/index.md
Normal file
@ -0,0 +1,21 @@
|
|||||||
|
---
|
||||||
|
layout: pattern
|
||||||
|
title: Message Channel
|
||||||
|
folder: message-channel
|
||||||
|
permalink: /patterns/message-channel/
|
||||||
|
categories: Integration
|
||||||
|
tags: Java
|
||||||
|
---
|
||||||
|
|
||||||
|
**Intent:** When two applications communicate using a messaging system they do it by using logical addresses
|
||||||
|
of the system, so called Message Channels.
|
||||||
|
|
||||||
|

|
||||||
|
|
||||||
|
**Applicability:** Use the Message Channel pattern when
|
||||||
|
|
||||||
|
* two or more applications need to communicate using a messaging system
|
||||||
|
|
||||||
|
**Real world examples:**
|
||||||
|
|
||||||
|
* [akka-camel](http://doc.akka.io/docs/akka/snapshot/scala/camel.html)
|
27
message-channel/pom.xml
Normal file
27
message-channel/pom.xml
Normal file
@ -0,0 +1,27 @@
|
|||||||
|
<?xml version="1.0"?>
|
||||||
|
<project
|
||||||
|
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
|
||||||
|
xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
|
||||||
|
<modelVersion>4.0.0</modelVersion>
|
||||||
|
<parent>
|
||||||
|
<groupId>com.iluwatar</groupId>
|
||||||
|
<artifactId>java-design-patterns</artifactId>
|
||||||
|
<version>1.6.0</version>
|
||||||
|
</parent>
|
||||||
|
<artifactId>message-channel</artifactId>
|
||||||
|
<dependencies>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.apache.camel</groupId>
|
||||||
|
<artifactId>camel-core</artifactId>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.apache.camel</groupId>
|
||||||
|
<artifactId>camel-stream</artifactId>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>junit</groupId>
|
||||||
|
<artifactId>junit</artifactId>
|
||||||
|
<scope>test</scope>
|
||||||
|
</dependency>
|
||||||
|
</dependencies>
|
||||||
|
</project>
|
@ -0,0 +1,53 @@
|
|||||||
|
package com.iluwatar.message.channel;
|
||||||
|
|
||||||
|
import org.apache.camel.CamelContext;
|
||||||
|
import org.apache.camel.builder.RouteBuilder;
|
||||||
|
import org.apache.camel.impl.DefaultCamelContext;
|
||||||
|
|
||||||
|
/**
|
||||||
|
*
|
||||||
|
* When two applications communicate with each other using a messaging system
|
||||||
|
* they first need to establish a communication channel that will carry the
|
||||||
|
* data. Message Channel decouples Message producers and consumers.
|
||||||
|
* <p>
|
||||||
|
* The sending application doesn't necessarily know what particular application
|
||||||
|
* will end up retrieving it, but it can be assured that the application that
|
||||||
|
* retrieves the information is interested in that information. This is because
|
||||||
|
* the messaging system has different Message Channels for different types of
|
||||||
|
* information the applications want to communicate. When an application sends
|
||||||
|
* information, it doesn't randomly add the information to any channel available;
|
||||||
|
* it adds it to a channel whose specific purpose is to communicate that sort of
|
||||||
|
* information. Likewise, an application that wants to receive particular information
|
||||||
|
* doesn't pull info off some random channel; it selects what channel to get information
|
||||||
|
* from based on what type of information it wants.
|
||||||
|
* <p>
|
||||||
|
* In this example we use Apache Camel to establish two different Message Channels. The first
|
||||||
|
* one reads from standard input and delivers messages to Direct endpoint. The second Message
|
||||||
|
* Channel is established from the Direct component to console output. No actual messages are sent,
|
||||||
|
* only the established routes are printed to standard output.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
public class App {
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Program entry point
|
||||||
|
* @param args command line args
|
||||||
|
* @throws Exception
|
||||||
|
*/
|
||||||
|
public static void main(String[] args) throws Exception {
|
||||||
|
CamelContext context = new DefaultCamelContext();
|
||||||
|
|
||||||
|
context.addRoutes(new RouteBuilder() {
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public void configure() throws Exception {
|
||||||
|
from("stream:in").to("direct:greetings");
|
||||||
|
from("direct:greetings").to("stream:out");
|
||||||
|
}
|
||||||
|
});
|
||||||
|
|
||||||
|
context.start();
|
||||||
|
context.getRoutes().stream().forEach((r) -> System.out.println(r));
|
||||||
|
context.stop();
|
||||||
|
}
|
||||||
|
}
|
@ -0,0 +1,17 @@
|
|||||||
|
package com.iluwatar.message.channel;
|
||||||
|
|
||||||
|
import org.junit.Test;
|
||||||
|
|
||||||
|
/**
|
||||||
|
*
|
||||||
|
* Application test
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
public class AppTest {
|
||||||
|
|
||||||
|
@Test
|
||||||
|
public void test() throws Exception {
|
||||||
|
String[] args = {};
|
||||||
|
App.main(args);
|
||||||
|
}
|
||||||
|
}
|
12
pom.xml
12
pom.xml
@ -17,6 +17,7 @@
|
|||||||
<coveralls.version>3.1.0</coveralls.version>
|
<coveralls.version>3.1.0</coveralls.version>
|
||||||
<jacoco.version>0.7.2.201409121644</jacoco.version>
|
<jacoco.version>0.7.2.201409121644</jacoco.version>
|
||||||
<commons-dbcp.version>1.4</commons-dbcp.version>
|
<commons-dbcp.version>1.4</commons-dbcp.version>
|
||||||
|
<camel.version>2.15.3</camel.version>
|
||||||
</properties>
|
</properties>
|
||||||
<modules>
|
<modules>
|
||||||
<module>abstract-factory</module>
|
<module>abstract-factory</module>
|
||||||
@ -75,6 +76,7 @@
|
|||||||
<module>half-sync-half-async</module>
|
<module>half-sync-half-async</module>
|
||||||
<module>step-builder</module>
|
<module>step-builder</module>
|
||||||
<module>layers</module>
|
<module>layers</module>
|
||||||
|
<module>message-channel</module>
|
||||||
</modules>
|
</modules>
|
||||||
|
|
||||||
<dependencyManagement>
|
<dependencyManagement>
|
||||||
@ -104,6 +106,16 @@
|
|||||||
<artifactId>commons-dbcp</artifactId>
|
<artifactId>commons-dbcp</artifactId>
|
||||||
<version>${commons-dbcp.version}</version>
|
<version>${commons-dbcp.version}</version>
|
||||||
</dependency>
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.apache.camel</groupId>
|
||||||
|
<artifactId>camel-core</artifactId>
|
||||||
|
<version>${camel.version}</version>
|
||||||
|
</dependency>
|
||||||
|
<dependency>
|
||||||
|
<groupId>org.apache.camel</groupId>
|
||||||
|
<artifactId>camel-stream</artifactId>
|
||||||
|
<version>${camel.version}</version>
|
||||||
|
</dependency>
|
||||||
<dependency>
|
<dependency>
|
||||||
<groupId>junit</groupId>
|
<groupId>junit</groupId>
|
||||||
<artifactId>junit</artifactId>
|
<artifactId>junit</artifactId>
|
||||||
|
Loading…
x
Reference in New Issue
Block a user