Lazy Loading with Supplier and Memoize

fdanismaz · fdanismaz · commit 1fdd403b1933 · 2019-06-03T16:21:56.000+03:00
diff --git a/lazy/pom.xml b/lazy/pom.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+		 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.fd</groupId>
+	<artifactId>lazy</artifactId>
+	<version>1.0-SNAPSHOT</version>
+
+	<properties>
+		<java-version>1.8</java-version>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.testng</groupId>
+			<artifactId>testng</artifactId>
+			<version>6.14.3</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.oath.cyclops</groupId>
+			<artifactId>cyclops</artifactId>
+			<version>10.3.0</version>
+		</dependency>
+
+
+	</dependencies>
+
+
+</project>
diff --git a/lazy/src/main/java/com/fd/lazy/FunctionPointer.java b/lazy/src/main/java/com/fd/lazy/FunctionPointer.java
@@ -0,0 +1,10 @@
+package com.fd.lazy;
+
+/**
+ * @author fdanismaz
+ * date: 6/3/19 4:10 PM
+ */
+public interface FunctionPointer<T> {
+
+	T get(int i);
+}
diff --git a/lazy/src/main/java/com/fd/lazy/SampleSupplier.java b/lazy/src/main/java/com/fd/lazy/SampleSupplier.java
@@ -0,0 +1,18 @@
+package com.fd.lazy;
+
+/**
+ * @author fdanismaz
+ * date: 6/3/19 3:48 PM
+ */
+public class SampleSupplier {
+
+	public static int CALL_TRACKER = 0;
+
+	public String getMessage() {
+		return "Hello World. This method is called " + ++CALL_TRACKER + " times";
+	}
+
+	public String getMessage(int i) {
+		return "Hello World. Passed value is : " + i;
+	}
+}
diff --git a/lazy/src/test/java/com/fd/lazy/TestSampleSupplier.java b/lazy/src/test/java/com/fd/lazy/TestSampleSupplier.java
@@ -0,0 +1,37 @@
+package com.fd.lazy;
+
+import cyclops.function.Memoize;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+import java.util.function.Supplier;
+
+/**
+ * @author fdanismaz
+ * date: 6/3/19 3:49 PM
+ */
+public class TestSampleSupplier {
+
+	SampleSupplier sampleSupplier = new SampleSupplier();
+
+	Supplier<String> message = Memoize.memoizeSupplier(sampleSupplier::getMessage);
+
+	FunctionPointer<String> message2 = sampleSupplier::getMessage;
+
+	@Test
+	public void testSupplier() {
+		System.out.println(message.get());
+		System.out.println(message.get());
+		System.out.println(message.get());
+		System.out.println(message.get());
+		System.out.println(message.get());
+		System.out.println(message.get());
+		System.out.println(message.get());
+		Assert.assertEquals(SampleSupplier.CALL_TRACKER, 1);
+	}
+
+	@Test
+	public void test() {
+		System.out.println(message2.get(6));
+	}
+}
