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Add LazyLambdaSingleton example #4

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6 changes: 2 additions & 4 deletions javapatterns.iml
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Original file line number Diff line number Diff line change
@@ -1,9 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="false">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8" inherit-compiler-output="false">
<output url="file://$MODULE_DIR$/target/classes" />
<output-test url="file://$MODULE_DIR$/target/test-classes" />
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
<excludeFolder url="file://$MODULE_DIR$/target" />
Expand All @@ -13,5 +12,4 @@
<orderEntry type="library" name="Maven: com.google.guava:guava:11.0.2" level="project" />
<orderEntry type="library" name="Maven: com.google.code.findbugs:jsr305:1.3.9" level="project" />
</component>
</module>

</module>
30 changes: 15 additions & 15 deletions pom.xml
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Expand Up @@ -12,34 +12,34 @@
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
<source>1.8</source>
<target>1.8</target>
<compilerArgument>-proc:none</compilerArgument>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<configuration>
<source>1.6</source>
<aggregate>true</aggregate>
<source>1.8</source>
<!--<aggregate>true</aggregate>-->
<doclet>gr.spinellis.umlgraph.doclet.UmlGraphDoc</doclet>
<docletArtifact>
<groupId>gr.spinellis</groupId>
<artifactId>UmlGraph</artifactId>
<version>4.6</version>
</docletArtifact>
<additionalparam>
-inferrel
-inferdep
-quiet
-constructors
-visibility
-types
-postfixpackage
-nodefontsize 9
-nodefontpackagesize 7
</additionalparam>
<!--<additionalparam>-->
<!-- -inferrel-->
<!-- -inferdep-->
<!-- -quiet-->
<!-- -constructors-->
<!-- -visibility-->
<!-- -types-->
<!-- -postfixpackage-->
<!-- -nodefontsize 9-->
<!-- -nodefontpackagesize 7-->
<!--</additionalparam>-->
</configuration>
</plugin>
</plugins>
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24 changes: 24 additions & 0 deletions src/main/java/org/abqjug/javapatterns/singleton/lazylambda/LazyLambdaSingleton.java
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package org.abqjug.javapatterns.singleton.lazylambda;

import com.google.common.base.Supplier;

/**
* User: Matt Lagrotte (matt@lagrotte.net)
* Date: 2/26/18
* Time: 2:00 PM
*/
public class LazyLambdaSingleton {

private static LazyLambdaSingleton instance = null;

private static Supplier<LazyLambdaSingleton> singletonSupplier = () ->
{
instance = new LazyLambdaSingleton();
singletonSupplier = () -> instance;
return instance;
};

public static LazyLambdaSingleton getInstance() {
return singletonSupplier.get();
}
}
60 changes: 60 additions & 0 deletions src/main/java/org/abqjug/javapatterns/singleton/lazylambda/LazyLambdaSingletonClient.java
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package org.abqjug.javapatterns.singleton.lazylambda;

/**
* User: Matt Lagrotte (matt@lagrotte.net)
* Date: 2/26/18
* Time: 2:00 PM
*/
public class LazyLambdaSingletonClient {
public static class SingletonRunner implements Runnable {
private LazyLambdaSingleton instance;

public LazyLambdaSingleton getInstance() {
return instance;
}

public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
instance = LazyLambdaSingleton.getInstance();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
}


public static void main(String[] args) throws InterruptedException {
SingletonRunner runner1 = new SingletonRunner();
SingletonRunner runner2 = new SingletonRunner();
SingletonRunner runner3 = new SingletonRunner();
SingletonRunner runner4 = new SingletonRunner();

Thread t1 = new Thread(runner1);
Thread t2 = new Thread(runner2);
Thread t3 = new Thread(runner3);
Thread t4 = new Thread(runner4);

t1.start();
t2.start();
t3.start();
t4.start();

t1.join();
t2.join();
t3.join();
t4.join();

assert runner1.getInstance() == runner2.getInstance();
assert runner2.getInstance() == runner3.getInstance();
assert runner3.getInstance() == runner4.getInstance();
assert runner4.getInstance() == runner1.getInstance();
assert runner2.getInstance() == runner4.getInstance();
assert runner3.getInstance() == runner1.getInstance();
}
}