Hw1 thread pool

HW1-Lazy/build.gradle

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+group 'JavaHW'
+version '1.0-SNAPSHOT'
+
+buildscript {
+	repositories {
+		mavenCentral()
+	}
+	dependencies {
+		classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.2'
+        classpath 'com.google.guava:guava:23.5-jre'
+        classpath 'org.mockito:mockito-all:2.0.2-beta'
+    }
+}
+
+repositories {
+	mavenCentral()
+}
+
+ext.junit4Version        = '4.12'
+ext.junitVintageVersion  = '4.12.2'
+ext.junitPlatformVersion = '1.0.2'
+ext.junitJupiterVersion  = '5.0.2'
+ext.log4jVersion         = '2.9.0'
+
+apply plugin: 'java'
+apply plugin: 'eclipse'
+apply plugin: 'idea'
+apply plugin: 'org.junit.platform.gradle.plugin'
+
+jar {
+	baseName = 'junit5-gradle-consumer'
+	version = '1.0.0-SNAPSHOT'
+}
+
+compileTestJava {
+	sourceCompatibility = 1.9
+	targetCompatibility = 1.9
+	options.compilerArgs += '-parameters'
+}
+
+junitPlatform {
+	// platformVersion '1.0.2'
+	filters {
+		engines {
+			// include 'junit-jupiter', 'junit-vintage'
+			// exclude 'custom-engine'
+		}
+		tags {
+			// include 'fast'
+			exclude 'slow'
+		}
+		// includeClassNamePattern '.*Test'
+	}
+	// configurationParameter 'junit.jupiter.conditions.deactivate', '*'
+	// enableStandardTestTask true
+	// reportsDir file('build/test-results/junit-platform') // this is the default
+	logManager 'org.apache.logging.log4j.jul.LogManager'
+}
+
+dependencies {
+	// JUnit Jupiter API and TestEngine implementation
+	testCompile("org.junit.jupiter:junit-jupiter-api:${junitJupiterVersion}")
+	testRuntime("org.junit.jupiter:junit-jupiter-engine:${junitJupiterVersion}")
+
+	// If you also want to support JUnit 3 and JUnit 4 tests
+	testCompile("junit:junit:${junit4Version}")
+	testRuntime("org.junit.vintage:junit-vintage-engine:${junitVintageVersion}")
+
+	// To avoid compiler warnings about @API annotations in JUnit code
+	testCompileOnly('org.apiguardian:apiguardian-api:1.0.0')
+
+	// To use Log4J's LogManager
+	testRuntime("org.apache.logging.log4j:log4j-core:${log4jVersion}")
+	testRuntime("org.apache.logging.log4j:log4j-jul:${log4jVersion}")
+
+	// Only needed to run tests in an (IntelliJ) IDE(A) that bundles an older version
+	testRuntime("org.junit.platform:junit-platform-launcher:${junitPlatformVersion}")
+
+    testCompile group: 'org.hamcrest', name: 'hamcrest-junit', version: '2.0.0.0'
+    compile group: 'org.jetbrains', name: 'annotations', version: '15.0'
+
+    compile group: 'com.google.guava', name: 'guava', version: '23.5-jre'
+	testCompile group: 'org.mockito', name: 'mockito-all', version: '2.0.2-beta'
+}
+
+task wrapper(type: Wrapper) {
+	description = 'Generates gradlew[.bat] scripts'
+	gradleVersion = '4.3.1'
+}

HW1-Lazy/gradle/wrapper/gradle-wrapper.properties

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+#Tue Feb 27 02:20:16 MSK 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.3.1-all.zip

HW1-Lazy/settings.gradle

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+rootProject.name = 'HW1-Lazy'
+

HW1-Lazy/src/main/java/ru/spbau/mit/kirakosian/Lazy.java

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+package ru.spbau.mit.kirakosian;
+
+/**
+ * Interface to store exactly one value and provide lazy evaluations. It means, that target
+ * value will be evaluated only one time, on the first get method call.
+ *
+ * This class in some way similar to Singleton pattern.
+ *
+ * @param <T> type of the stored element.
+ */
+public interface Lazy<T> {
+
+    /**
+     * Returns stored in Lazy value. Evaluates this value if it is not known yet,
+     * otherwise returns already evaluated value.
+     */
+    T get();
+
+}