From 36fb193c232e3fa46b5f7dba21cf0f0424b17da7 Mon Sep 17 00:00:00 2001
From: viktoriurkov <victor.iurkov@gmail.com>
Date: Mon, 30 Oct 2023 20:04:03 +0300
Subject: [PATCH 1/4] [HM-2] singleton pattern with lazy init

---
 src/main/kotlin/main.kt | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 src/main/kotlin/main.kt

diff --git a/src/main/kotlin/main.kt b/src/main/kotlin/main.kt
new file mode 100644
index 0000000..bd2c807
--- /dev/null
+++ b/src/main/kotlin/main.kt
@@ -0,0 +1,8 @@
+fun main() {
+    // singleton with lazy init
+    val singleton by lazy {
+        object {
+            val singletonVariable = 10
+        }
+    }
+}
\ No newline at end of file

From 1c35104c949a36dfd46c56264ea29dd91f122680 Mon Sep 17 00:00:00 2001
From: viktoriurkov <victor.iurkov@gmail.com>
Date: Mon, 30 Oct 2023 20:36:42 +0300
Subject: [PATCH 2/4] [HM-2] decorator impl

---
 src/main/kotlin/decorator.kt | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/main/kotlin/decorator.kt

diff --git a/src/main/kotlin/decorator.kt b/src/main/kotlin/decorator.kt
new file mode 100644
index 0000000..b09a40b
--- /dev/null
+++ b/src/main/kotlin/decorator.kt
@@ -0,0 +1,19 @@
+import java.util.WeakHashMap
+
+interface Calculator {
+    fun sum(i: Int, j: Int): Int
+}
+
+class BaseCalculator : Calculator {
+    override fun sum(i: Int, j: Int): Int {
+        return i + j
+    }
+}
+
+class FastCalculator(private var calculator: Calculator): Calculator {
+    override fun sum(i: Int, j: Int): Int {
+        System.out.println("sum is ${i + j}") // logging for example. Hard to create smthng unique as example (
+        return calculator.sum(i, j)
+    }
+
+}
\ No newline at end of file

From 9e62a4b6cbd687f81ed905e4df05faa3176104d1 Mon Sep 17 00:00:00 2001
From: viktoriurkov <victor.iurkov@gmail.com>
Date: Mon, 30 Oct 2023 21:08:23 +0300
Subject: [PATCH 3/4] [HM-2] command impl

---
 src/main/kotlin/command.kt | 49 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 src/main/kotlin/command.kt

diff --git a/src/main/kotlin/command.kt b/src/main/kotlin/command.kt
new file mode 100644
index 0000000..fc1fc15
--- /dev/null
+++ b/src/main/kotlin/command.kt
@@ -0,0 +1,49 @@
+interface Calculate {
+    var result: Number
+    fun exec()
+}
+
+class Sum(var num1: Int, var num2: Int): Calculate {
+    override var result: Number = 0
+
+    override fun exec() {
+        result = num1 + num2
+    }
+}
+
+class Multiply(var num1: Double, var num2: Double): Calculate {
+    override var result: Number = 0
+
+    override fun exec() {
+        result = num1 * num2
+    }
+}
+
+class CalculatorInvoker {
+    private var lock = Any()
+    private var queue = mutableListOf<Calculate>()
+
+    fun calculate(procedure: Calculate) {
+        queue.add(procedure)
+        if (queue.size >= 9) {
+            synchronized(lock) {
+                exec()
+            }
+        }
+    }
+    private fun exec() {
+        queue.forEach {it.exec()}
+        queue.clear()
+    }
+}
+
+class Worker() {
+    var invoker = CalculatorInvoker()
+    var sum = Sum(1, 7)
+    var multiply = Multiply(1.0, 9.0)
+
+    fun start() {
+        invoker.calculate(sum)
+        invoker.calculate(multiply)
+    }
+}
\ No newline at end of file

From 1b118a327bec9494c6026ef335fc9017746d294e Mon Sep 17 00:00:00 2001
From: viktoriurkov <victor.iurkov@gmail.com>
Date: Mon, 30 Oct 2023 21:35:06 +0300
Subject: [PATCH 4/4] [HM-2] builder impl

---
 src/main/kotlin/bulder.kt | 3 +++
 1 file changed, 3 insertions(+)
 create mode 100644 src/main/kotlin/bulder.kt

diff --git a/src/main/kotlin/bulder.kt b/src/main/kotlin/bulder.kt
new file mode 100644
index 0000000..68a0224
--- /dev/null
+++ b/src/main/kotlin/bulder.kt
@@ -0,0 +1,3 @@
+class Human(var name: String = "John", var lastName: String = "Dow", var age: Int = 18)
+
+// Если использовать билдер как конфиг объекта с дефолт значениями - то вариант более удобный
\ No newline at end of file