diff --git a/.travis.yml b/.travis.yml
index aac6a7a..da7e1d1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,4 +3,8 @@ language: java
sudo: false
notifications:
- email: false
\ No newline at end of file
+ email: false
+
+env:
+ - TEST_DIR=Lazy
+script: cd $TEST_DIR && ./gradlew clean check
\ No newline at end of file
diff --git a/Lazy/.idea/compiler.xml b/Lazy/.idea/compiler.xml
new file mode 100644
index 0000000..cbd30da
--- /dev/null
+++ b/Lazy/.idea/compiler.xml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/gradle.xml b/Lazy/.idea/gradle.xml
new file mode 100644
index 0000000..a5c3ae1
--- /dev/null
+++ b/Lazy/.idea/gradle.xml
@@ -0,0 +1,17 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/libraries/Gradle__com_intellij_annotations_12_0.xml b/Lazy/.idea/libraries/Gradle__com_intellij_annotations_12_0.xml
new file mode 100644
index 0000000..55f6be3
--- /dev/null
+++ b/Lazy/.idea/libraries/Gradle__com_intellij_annotations_12_0.xml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/libraries/Gradle__junit_junit_4_12.xml b/Lazy/.idea/libraries/Gradle__junit_junit_4_12.xml
new file mode 100644
index 0000000..04c10dd
--- /dev/null
+++ b/Lazy/.idea/libraries/Gradle__junit_junit_4_12.xml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml b/Lazy/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml
new file mode 100644
index 0000000..8262f72
--- /dev/null
+++ b/Lazy/.idea/libraries/Gradle__org_hamcrest_hamcrest_core_1_3.xml
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/libraries/annotations.xml b/Lazy/.idea/libraries/annotations.xml
new file mode 100644
index 0000000..d70b509
--- /dev/null
+++ b/Lazy/.idea/libraries/annotations.xml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/misc.xml b/Lazy/.idea/misc.xml
new file mode 100644
index 0000000..9f380d5
--- /dev/null
+++ b/Lazy/.idea/misc.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/modules.xml b/Lazy/.idea/modules.xml
new file mode 100644
index 0000000..3cedb59
--- /dev/null
+++ b/Lazy/.idea/modules.xml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/modules/Lazy.iml b/Lazy/.idea/modules/Lazy.iml
new file mode 100644
index 0000000..7dbca07
--- /dev/null
+++ b/Lazy/.idea/modules/Lazy.iml
@@ -0,0 +1,14 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/modules/Lazy_main.iml b/Lazy/.idea/modules/Lazy_main.iml
new file mode 100644
index 0000000..c0dcef3
--- /dev/null
+++ b/Lazy/.idea/modules/Lazy_main.iml
@@ -0,0 +1,14 @@
+
+
+
+
+
+
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+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/modules/Lazy_test.iml b/Lazy/.idea/modules/Lazy_test.iml
new file mode 100644
index 0000000..c947404
--- /dev/null
+++ b/Lazy/.idea/modules/Lazy_test.iml
@@ -0,0 +1,18 @@
+
+
+
+
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+
\ No newline at end of file
diff --git a/Lazy/.idea/uiDesigner.xml b/Lazy/.idea/uiDesigner.xml
new file mode 100644
index 0000000..e96534f
--- /dev/null
+++ b/Lazy/.idea/uiDesigner.xml
@@ -0,0 +1,124 @@
+
+
+
+
+ -
+
+
+ -
+
+
+ -
+
+
+ -
+
+
+ -
+
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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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+ -
+
+
+ -
+
+
+
+
+ -
+
+
+ -
+
+
+
+
+
\ No newline at end of file
diff --git a/Lazy/.idea/workspace.xml b/Lazy/.idea/workspace.xml
new file mode 100644
index 0000000..55e7285
--- /dev/null
+++ b/Lazy/.idea/workspace.xml
@@ -0,0 +1,751 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
+
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+
+
+ 1522151150630
+
+
+ 1522151150630
+
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\ No newline at end of file
diff --git a/Lazy/build.gradle b/Lazy/build.gradle
new file mode 100644
index 0000000..392df6b
--- /dev/null
+++ b/Lazy/build.gradle
@@ -0,0 +1,15 @@
+group 'ru.spbau.dkaznacheev'
+version '1.0-SNAPSHOT'
+
+apply plugin: 'java'
+
+sourceCompatibility = 1.8
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ testCompile group: 'junit', name: 'junit', version: '4.12'
+ compile group: 'com.intellij', name: 'annotations', version: '12.0'
+}
diff --git a/Lazy/gradle/wrapper/gradle-wrapper.jar b/Lazy/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..c5b9fcf
Binary files /dev/null and b/Lazy/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/Lazy/gradle/wrapper/gradle-wrapper.properties b/Lazy/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e1f8bff
--- /dev/null
+++ b/Lazy/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sun Mar 04 17:12:32 MSK 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.5-rc-2-bin.zip
diff --git a/Lazy/gradlew b/Lazy/gradlew
new file mode 100755
index 0000000..4453cce
--- /dev/null
+++ b/Lazy/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG=`dirname "$PRG"`"/$link"
+ fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+ echo "$*"
+}
+
+die ( ) {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD="$JAVA_HOME/jre/sh/java"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ fi
+ if [ ! -x "$JAVACMD" ] ; then
+ die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD="java"
+ which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+ MAX_FD_LIMIT=`ulimit -H -n`
+ if [ $? -eq 0 ] ; then
+ if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+ MAX_FD="$MAX_FD_LIMIT"
+ fi
+ ulimit -n $MAX_FD
+ if [ $? -ne 0 ] ; then
+ warn "Could not set maximum file descriptor limit: $MAX_FD"
+ fi
+ else
+ warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+ fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+ GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # We build the pattern for arguments to be converted via cygpath
+ ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+ SEP=""
+ for dir in $ROOTDIRSRAW ; do
+ ROOTDIRS="$ROOTDIRS$SEP$dir"
+ SEP="|"
+ done
+ OURCYGPATTERN="(^($ROOTDIRS))"
+ # Add a user-defined pattern to the cygpath arguments
+ if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+ OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+ fi
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ i=0
+ for arg in "$@" ; do
+ CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+ CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
+
+ if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
+ eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+ else
+ eval `echo args$i`="\"$arg\""
+ fi
+ i=$((i+1))
+ done
+ case $i in
+ (0) set -- ;;
+ (1) set -- "$args0" ;;
+ (2) set -- "$args0" "$args1" ;;
+ (3) set -- "$args0" "$args1" "$args2" ;;
+ (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+ (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+ (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+ (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+ (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+ (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+ esac
+fi
+
+# Escape application args
+save ( ) {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/Lazy/gradlew.bat b/Lazy/gradlew.bat
new file mode 100644
index 0000000..f955316
--- /dev/null
+++ b/Lazy/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/Lazy/settings.gradle b/Lazy/settings.gradle
new file mode 100644
index 0000000..c9285fe
--- /dev/null
+++ b/Lazy/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'Lazy'
+
diff --git a/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/Lazy.java b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/Lazy.java
new file mode 100644
index 0000000..bb01a5a
--- /dev/null
+++ b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/Lazy.java
@@ -0,0 +1,14 @@
+package ru.spbau.dkaznacheev.lazy;
+
+/**
+ * Lazy is an interface for lazy computations.
+ * Constructed with supplier, it is guaranteed that the supplier will be called only once.
+ * @param type of the value that Lazy returns
+ */
+public interface Lazy {
+ /**
+ * Returns the value.
+ * @return value
+ */
+ T get();
+}
diff --git a/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyFactory.java b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyFactory.java
new file mode 100644
index 0000000..b161f1d
--- /dev/null
+++ b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyFactory.java
@@ -0,0 +1,41 @@
+package ru.spbau.dkaznacheev.lazy;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Supplier;
+
+/**
+ * Class for creating Lazy instances.
+ */
+public class LazyFactory {
+ /**
+ * Creates non-thread-safe Lazy instance.
+ * @param supplier supplier for Lazy
+ * @param type of value
+ * @return a new instance of Lazy
+ */
+ public static Lazy createSingleThreadLazy(@NotNull Supplier supplier) {
+ return new Lazy() {
+ private Supplier lazySupplier = supplier;
+ private T result;
+ @Override
+ public T get() {
+ if (lazySupplier != null) {
+ result = lazySupplier.get();
+ lazySupplier = null;
+ }
+ return result;
+ }
+ };
+ }
+
+ /**
+ * Creates thread-safe Lazy instance.
+ * @param supplier supplier for Lazy
+ * @param type of value
+ * @return a new instance of Lazy
+ */
+ public static Lazy createMultiThreadLazy(@NotNull Supplier supplier) {
+ return new LazyImpl(supplier);
+ }
+}
diff --git a/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyImpl.java b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyImpl.java
new file mode 100644
index 0000000..07564e8
--- /dev/null
+++ b/Lazy/src/main/java/ru/spbau/dkaznacheev/lazy/LazyImpl.java
@@ -0,0 +1,49 @@
+package ru.spbau.dkaznacheev.lazy;
+
+import java.util.function.Supplier;
+
+/**
+ * A thread-safe implementation of Lazy interface, only runs its Supplier once.
+ * @param type that Lazy returns
+ */
+public class LazyImpl implements Lazy {
+
+ /**
+ * A stub object that resembles the uninitialized value.
+ */
+ private static final Object notInitialized = new Object();
+
+ /**
+ * Value that Lazy returns.
+ */
+ private volatile T value;
+
+ /**
+ * The supplier that generates the value of Lazy.
+ */
+ private Supplier supplier;
+
+ @SuppressWarnings("unchecked")
+ public LazyImpl(Supplier supplier) {
+ value = (T)notInitialized;
+ this.supplier = supplier;
+ }
+
+ /**
+ * Returns the supplier's value.
+ * If it was already called, returns the remembered value, not running the supplier again.
+ * @return supplier's value
+ */
+ @Override
+ public T get() {
+ if (value == notInitialized) {
+ synchronized (notInitialized) {
+ if (value == notInitialized) {
+ value = supplier.get();
+ supplier = null;
+ }
+ }
+ }
+ return value;
+ }
+}
diff --git a/Lazy/src/test/java/ru/spbau/dkaznacheev/lazy/LazyTest.java b/Lazy/src/test/java/ru/spbau/dkaznacheev/lazy/LazyTest.java
new file mode 100644
index 0000000..3cd493f
--- /dev/null
+++ b/Lazy/src/test/java/ru/spbau/dkaznacheev/lazy/LazyTest.java
@@ -0,0 +1,134 @@
+package ru.spbau.dkaznacheev.lazy;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class LazyTest {
+ private static final int THREADS_NUM = 1000;
+
+ private static class Job implements Supplier {
+ private int called = 0;
+ private boolean isLong;
+
+ public Job(boolean isLong) {
+ this.isLong = isLong;
+ }
+
+ public boolean getShort() {
+ called++;
+ return true;
+ }
+
+ public boolean getLong() {
+ called++;
+ for (int i = 0; i < 1000000; i++);
+ return true;
+ }
+
+ public boolean calledOnce() {
+ return called == 1;
+ }
+
+ @Override
+ public Boolean get() {
+ return isLong ? getLong() : getShort();
+ }
+ }
+
+ @Test
+ public void singleThreadLazyTest() {
+ Job job = new Job(false);
+ Lazy lazy = LazyFactory.createSingleThreadLazy(job);
+ for (int i = 0; i < 100; i++) {
+ lazy.get();
+ }
+ assertTrue(job.calledOnce());
+ }
+
+ @Test
+ public void lazyReturnsSameTest() {
+ Object object = new Object();
+ Lazy