SpinLockSynchronizedState

build.gradle.kts

@@ -15,7 +15,7 @@ buildscript {
 }
 
 group = "ru.landgrafhomyak.utility"
-version = "1.3"
+version = "1.4"
 
 repositories {
 	mavenCentral()

src/jvmMain/java/ru/landgrafhomyak/utility/closeable_state_1/SpinLockSynchronizedState.java

@@ -0,0 +1,106 @@
+package ru.landgrafhomyak.utility.closeable_state_1;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+public /* open */ class SpinLockSynchronizedState
+		extends SpinLockSynchronizedState$Errors
+		implements CloseableState.ExternallySynchronized {
+
+	private enum State {
+		OPEN, IN_USE, CLOSED
+	}
+
+	private final AtomicReference<State> _currentState;
+
+	public SpinLockSynchronizedState() {
+		this._currentState = new AtomicReference<>(State.OPEN);
+	}
+
+	@Override
+	public final boolean isInUse() {
+		return this._currentState.get() == State.IN_USE;
+	}
+
+	@Override
+	public final boolean isClosed() {
+		return this._currentState.get() == State.CLOSED;
+	}
+
+	@Override
+	public final void assertNotClosed() {
+		if (this.isClosed())
+			this.throwClosed();
+	}
+
+	@ManualStateManipulation
+	@Override
+	public final void startUsage() {
+		if (this.startUsageIfNotClosed())
+			this.throwClosed();
+	}
+
+	@ManualStateManipulation
+	@Override
+	public final boolean startUsageIfNotClosed() {
+		while (true) {
+			switch (this._currentState.compareAndExchange(State.OPEN, State.IN_USE)) {
+				case IN_USE:
+					Thread.onSpinWait();
+					continue;
+				case CLOSED:
+					return true;
+				case OPEN:
+					return false;
+			}
+		}
+	}
+
+	private void _finishUsage(State nextState) {
+		switch (this._currentState.compareAndExchange(State.IN_USE, nextState)) {
+			case OPEN:
+				throw new IllegalStateException("Can't finish usage because it isn't started");
+			case CLOSED:
+				this.throwClosed();
+			case IN_USE:
+		}
+	}
+
+
+	@ManualStateManipulation
+	@Override
+	public final void finishUsage() {
+		this._finishUsage(State.OPEN);
+	}
+
+	@ManualStateManipulation
+	@Override
+	public void finishUsage(boolean close) {
+		this._finishUsage(close ? State.CLOSED : State.OPEN);
+	}
+
+	@Destructor
+	@ManualStateManipulation
+	@Override
+	public final void close() {
+		switch (this._currentState.compareAndExchange(State.OPEN, State.CLOSED)) {
+			case CLOSED:
+				this.throwClosed();
+			case IN_USE:
+				this.throwInUse();
+			case OPEN:
+		}
+	}
+
+	@Override
+	public String toString() {
+		switch (this._currentState.get()) {
+			case CLOSED:
+				return "<closeable spinlock-synchronized state [free]>";
+			case IN_USE:
+				return "<closeable spinlock-synchronized state [in use]>";
+			case OPEN:
+				return "<closeable spinlock-synchronized state [closed]>";
+		}
+		throw new RuntimeException("Unreachable");
+	}
+}

src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/OwnedSpinLockSynchronizedState.kt

@@ -0,0 +1,37 @@
+@file:OptIn(ExperimentalContracts::class)
+
+package ru.landgrafhomyak.utility.closeable_state_1
+
+import kotlin.contracts.ExperimentalContracts
+
+public class OwnedSpinLockSynchronizedState : SpinLockSynchronizedState {
+	private var _owner: Any?
+
+	public constructor() : super() {
+		this._owner = null
+	}
+
+	public constructor(owner: Any) : super() {
+		this._owner = owner
+	}
+
+	public var owner: Any
+		get() = this._owner ?: throw IllegalStateException("Owner not set yet")
+		set(value) {
+			if (this._owner != null) throw IllegalStateException("Owner already initialized")
+			this._owner = value
+		}
+
+	override fun throwClosed(): Nothing {
+		throw IllegalStateException("Object is closed: ${this._owner}")
+	}
+
+	override fun throwInUse(): Nothing {
+		throw IllegalStateException("Failed close object because it is in use: ${this._owner}")
+	}
+
+	override fun toString(): String {
+		val base = super.toString()
+		return base.substring(0, base.length - 1) + " of ${this._owner}>"
+	}
+}

src/jvmMain/kotlin/ru/landgrafhomyak/utility/closeable_state_1/SpinLockSynchronizedState$Errors.kt

@@ -0,0 +1,11 @@
+package ru.landgrafhomyak.utility.closeable_state_1
+
+internal abstract class `SpinLockSynchronizedState$Errors` : CloseableState.ExternallySynchronized {
+	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")
+	}
+}