From c30c585f7620fbe935c5efe49f2016678245598e Mon Sep 17 00:00:00 2001
From: Andrew Golovashevich <landgrafhomyak@gmail.com>
Date: Sun, 24 Aug 2025 00:43:25 +0300
Subject: [PATCH] UsagesCounter implementation on java

---
 build.gradle.kts                              |  1 +
 .../closeable_state_1/CloseableState.kt       |  4 +-
 .../closeable_state_1/jUsagesCounter.java     | 66 +++++++++++++++++++
 .../jUsagesCounter$Errors.kt                  | 13 ++++
 .../closeable_state_1/UsagesCounter.kt        |  0
 5 files changed, 82 insertions(+), 2 deletions(-)
 create mode 100644 src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter.java
 create mode 100644 src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
 rename src/{commonMain => nonJvmMain}/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt (100%)

diff --git a/build.gradle.kts b/build.gradle.kts
index 4a3ce8d..7e29b4f 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -38,6 +38,7 @@ xomrk {
 			compilations.configureEach {
 				compileJavaTaskProvider?.configure {
 					targetCompatibility = "1.8"
+					sourceCompatibility = "1.8"
 				}
 				compileTaskProvider.configure {
 					compilerOptions {
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/CloseableState.kt b/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/CloseableState.kt
index 2017dc6..94ac59a 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/CloseableState.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/CloseableState.kt
@@ -1,10 +1,10 @@
 package ru.landgrafhomyak.utility.closeable_state_1
 
 public interface CloseableState {
-	public fun assertNotClosed()
-
 	public val isClosed: Boolean
 
+	public fun assertNotClosed()
+
 	@ManualStateManipulation
 	public fun startUsage()
 
diff --git a/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter.java b/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter.java
new file mode 100644
index 0000000..7afae9e
--- /dev/null
+++ b/src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter.java
@@ -0,0 +1,66 @@
+package ru.landgrafhomyak.utility.closeable_state_1;
+
+import ru.landgrafhomyak.utility.closeable_state_1.internal.Misc;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public class jUsagesCounter extends jUsagesCounter$Errors implements CloseableState.AllowsConcurrency {
+	private final AtomicLong _referencesCounter;
+
+	public jUsagesCounter() {
+		this._referencesCounter = new AtomicLong(0);
+	}
+
+	@Override
+	public boolean isClosed() {
+		return this._referencesCounter.get() < 0;
+	}
+
+	@Override
+	public void assertNotClosed() {
+		if (this._referencesCounter.get() < 0)
+			this.throwClosed();
+	}
+
+	@Override
+	public void startUsage() {
+		while (true) {
+			final long cur = this._referencesCounter.get();
+			if (cur < 0) {
+				this.throwClosed();
+				return;
+			}
+
+			if (this._referencesCounter.compareAndSet(cur, cur + 1))
+				return;
+		}
+	}
+
+	@Override
+	public void finishUsage() {
+		while (true) {
+			final long cur = this._referencesCounter.get();
+			if (cur < 0) {
+				this.throwClosed();
+				return;
+			}
+
+			if (this._referencesCounter.compareAndSet(cur, cur - 1))
+				return;
+		}
+	}
+
+	@Override
+	public void close() {
+		long currentReferencesCount;
+		while (true) {
+			currentReferencesCount = this._referencesCounter.get();
+			if (currentReferencesCount != 0) break;
+			if (this._referencesCounter.compareAndSet(currentReferencesCount, Misc.CLOSED_STATE_VALUE))
+				break;
+		}
+
+		if (currentReferencesCount > 0) this.throwInUse();
+		if (currentReferencesCount < 0) this.throwClosed();
+	}
+}
diff --git a/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
new file mode 100644
index 0000000..cb1bc9c
--- /dev/null
+++ b/src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/jUsagesCounter$Errors.kt
@@ -0,0 +1,13 @@
+package ru.landgrafhomyak.utility.closeable_state_1
+
+import kotlin.IllegalStateException
+
+internal abstract class `jUsagesCounter$Errors` {
+	protected open fun throwClosed(): Nothing {
+		throw IllegalStateException("Object is closed")
+	}
+
+	protected open fun throwInUse(): Nothing {
+		throw IllegalStateException("Failed close object because it is in use")
+	}
+}
\ No newline at end of file
diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt b/src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
similarity index 100%
rename from src/commonMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt
rename to src/nonJvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/UsagesCounter.kt