From cc77a47d70af86837e66c1f850c9f717e1fa5765 Mon Sep 17 00:00:00 2001
From: currenjin <hyun0524e@naver.com>
Date: Tue, 21 Jan 2025 22:48:53 +0900
Subject: [PATCH] Feat: Atom

---
 .../java/com/currenjin/concurrency/Atom.java  | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 the-well-grounded-java-developer/src/main/java/com/currenjin/concurrency/Atom.java

diff --git a/the-well-grounded-java-developer/src/main/java/com/currenjin/concurrency/Atom.java b/the-well-grounded-java-developer/src/main/java/com/currenjin/concurrency/Atom.java
new file mode 100644
index 0000000..aab4a69
--- /dev/null
+++ b/the-well-grounded-java-developer/src/main/java/com/currenjin/concurrency/Atom.java
@@ -0,0 +1,25 @@
+package com.currenjin.concurrency;
+
+public class Atom {
+	private volatile int value;
+
+	public Atom(int value) {
+		this.value = value;
+	}
+
+	public final int incrementAndGet() {
+		while(true) {
+			int current = value;
+			int next = current + 1;
+			if (compareAndSet(current, next)) {
+				return next;
+			}
+		}
+	}
+
+	private boolean compareAndSet(int expected, int newValue) {
+		return true;
+		// CPU 명령
+		// return unsafe.compareAndSwapInt(this, valueOffset, expected, newValue);
+	}
+}