Merge pull request #561 from InsanusMokrassar/0.25.3

0.25.3

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.25.3
+
+* `Coroutines`:
+  * Add extensions `SmartRWLocker.alsoWithUnlockingOnSuccessAsync` and `SmartRWLocker.alsoWithUnlockingOnSuccess`
+  * Fix of `SmartRWLocker.lockWrite` issue when it could lock write mutex without unlocking
+  * Add tool `SmartKeyRWLocker`
+  * `SmartSemaphore` got new property `maxPermits`
+  * New extension `SmartSemaphore.waitReleaseAll()`
+* `Transactions`:
+  * Add `TransactionsDSL`
+
 ## 0.25.2
 
 * `Versions`:

colors/common/src/commonMain/kotlin/HEXAColor.kt

@@ -13,7 +13,7 @@ import kotlin.math.floor
  *
  * Anyway it is recommended to use
  *
- * @param hexaUInt rgba [UInt] in format `0xFFEEBBAA` where FF - red, EE - green, BB - blue` and AA - alpha
+ * @param hexaUInt rgba [UInt] in format `0xRRGGBBAA` where RR - red, GG - green, BB - blue` and AA - alpha
  */
 @Serializable
 @JvmInline
@@ -21,18 +21,18 @@ value class HEXAColor (
     val hexaUInt: UInt
 ) : Comparable<HEXAColor> {
     /**
-     * @returns [hexaUInt] as a string with format `#FFEEBBAA` where FF - red, EE - green, BB - blue and AA - alpha
+     * @returns [hexaUInt] as a string with format `#RRGGBBAA` where RR - red, GG - green, BB - blue and AA - alpha
      */
     val hexa: String
         get() = "#${hexaUInt.toString(16).padStart(8, '0')}"
 
     /**
-     * @returns [hexaUInt] as a string with format `#FFEEBB` where FF - red, EE - green and BB - blue
+     * @returns [hexaUInt] as a string with format `#RRGGBB` where RR - red, GG - green and BB - blue
      */
     val hex: String
         get() = hexa.take(7)
     /**
-     * @returns [hexaUInt] as a string with format `#AAFFEEBB` where AA - alpha, FF - red, EE - green and BB - blue
+     * @returns [hexaUInt] as a string with format `#AARRGGBB` where AA - alpha, RR - red, GG - green and BB - blue
      */
     val ahex: String
         get() = "#${a.toString(16).padStart(2, '2')}${hex.drop(1)}"
@@ -140,12 +140,12 @@ value class HEXAColor (
         }.lowercase().toUInt(16).let(::HEXAColor)
 
         /**
-         * Creates [HEXAColor] from [uint] presume it is in format `0xFFEEBBAA` where FF - red, EE - green, BB - blue` and AA - alpha
+         * Creates [HEXAColor] from [uint] presume it is in format `0xRRGGBBAA` where RR - red, GG - green, BB - blue` and AA - alpha
          */
         fun fromHexa(uint: UInt) = HEXAColor(uint)
 
         /**
-         * Creates [HEXAColor] from [uint] presume it is in format `0xAAFFEEBB` where AA - alpha, FF - red, EE - green and BB - blue`
+         * Creates [HEXAColor] from [uint] presume it is in format `0xAARRGGBB` where AA - alpha, RR - red, GG - green and BB - blue`
          */
         fun fromAhex(uint: UInt) = HEXAColor(
             a = ((uint and 0xff000000u) / 0x1000000u).toInt(),

coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/SmartKeyRWLocker.kt

@@ -0,0 +1,224 @@
+package dev.inmo.micro_utils.coroutines
+
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
+
+/**
+ * Combining [globalRWLocker] and internal map of [SmartRWLocker] associated by [T] to provide next logic:
+ *
+ * * Locker by key, for reading: waiting for [globalRWLocker] unlock write by acquiring read permit in it and then
+ * taking or creating locker for key [T] and lock its reading too
+ * * Locker by key, for writing: waiting for [globalRWLocker] unlock write by acquiring read permit in it and then
+ * taking or creating locker for key [T] and lock its writing
+ * * [globalRWLocker], for reading: using [SmartRWLocker.acquireRead], will be suspended until its
+ * [SmartRWLocker.lockWrite] will not be unlocked
+ * * [globalRWLocker], for writing: using [SmartRWLocker.lockWrite], will be paused by other reading and writing
+ * operations and will pause other operations until the end of operation (calling of [unlockWrite])
+ *
+ * You may see, that lockers by key still will use global locker permits - it is required to prevent [globalRWLocker]
+ * write locking during all other operations are not done. In fact, all the keys works like a simple [SmartRWLocker] as
+ * well, as [globalRWLocker], but they are linked with [globalRWLocker] [SmartRWLocker.acquireRead] permissions
+ */
+class SmartKeyRWLocker<T>(
+    globalLockerReadPermits: Int = Int.MAX_VALUE,
+    globalLockerWriteIsLocked: Boolean = false,
+    private val perKeyReadPermits: Int = Int.MAX_VALUE
+) {
+    private val globalRWLocker: SmartRWLocker = SmartRWLocker(
+        readPermits = globalLockerReadPermits,
+        writeIsLocked = globalLockerWriteIsLocked
+    )
+    private val lockers = mutableMapOf<T, SmartRWLocker>()
+    private val lockersMutex = Mutex()
+    private val lockersWritingLocker = SmartSemaphore.Mutable(Int.MAX_VALUE)
+    private val globalWritingLocker = SmartSemaphore.Mutable(Int.MAX_VALUE)
+
+    private fun allocateLockerWithoutLock(key: T) = lockers.getOrPut(key) {
+        SmartRWLocker(perKeyReadPermits)
+    }
+    private suspend fun allocateLocker(key: T) = lockersMutex.withLock {
+        lockers.getOrPut(key) {
+            SmartRWLocker(perKeyReadPermits)
+        }
+    }
+
+    suspend fun writeMutex(key: T): SmartMutex.Immutable = globalRWLocker.withReadAcquire {
+        allocateLockerWithoutLock(key).writeMutex
+    }
+    suspend fun readSemaphore(key: T): SmartSemaphore.Immutable = globalRWLocker.withReadAcquire {
+        allocateLockerWithoutLock(key).readSemaphore
+    }
+    fun writeMutexOrNull(key: T): SmartMutex.Immutable? = lockers[key] ?.writeMutex
+    fun readSemaphoreOrNull(key: T): SmartSemaphore.Immutable? = lockers[key] ?.readSemaphore
+
+    fun writeMutex(): SmartMutex.Immutable = globalRWLocker.writeMutex
+    fun readSemaphore(): SmartSemaphore.Immutable = globalRWLocker.readSemaphore
+
+    suspend fun acquireRead() {
+        globalWritingLocker.acquire()
+        try {
+            lockersWritingLocker.waitReleaseAll()
+            globalRWLocker.acquireRead()
+        } catch (e: CancellationException) {
+            globalWritingLocker.release()
+            throw e
+        }
+    }
+    suspend fun releaseRead(): Boolean {
+        globalWritingLocker.release()
+        return globalRWLocker.releaseRead()
+    }
+
+    suspend fun lockWrite() {
+        globalRWLocker.lockWrite()
+    }
+    suspend fun unlockWrite(): Boolean {
+        return globalRWLocker.unlockWrite()
+    }
+    fun isWriteLocked(): Boolean = globalRWLocker.writeMutex.isLocked == true
+
+
+    suspend fun acquireRead(key: T) {
+        globalRWLocker.acquireRead()
+        val locker = allocateLocker(key)
+        try {
+            locker.acquireRead()
+        } catch (e: CancellationException) {
+            globalRWLocker.releaseRead()
+            throw e
+        }
+    }
+    suspend fun releaseRead(key: T): Boolean {
+        val locker = allocateLocker(key)
+        return locker.releaseRead() && globalRWLocker.releaseRead()
+    }
+
+    suspend fun lockWrite(key: T) {
+        globalWritingLocker.withAcquire(globalWritingLocker.maxPermits) {
+            lockersWritingLocker.acquire()
+        }
+        try {
+            globalRWLocker.acquireRead()
+            try {
+                val locker = allocateLocker(key)
+                locker.lockWrite()
+            } catch (e: CancellationException) {
+                globalRWLocker.releaseRead()
+                throw e
+            }
+        } catch (e: CancellationException) {
+            lockersWritingLocker.release()
+            throw e
+        }
+    }
+    suspend fun unlockWrite(key: T): Boolean {
+        val locker = allocateLocker(key)
+        return (locker.unlockWrite() && globalRWLocker.releaseRead()).also {
+            if (it) {
+                lockersWritingLocker.release()
+            }
+        }
+    }
+    fun isWriteLocked(key: T): Boolean = lockers[key] ?.writeMutex ?.isLocked == true
+}
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withReadAcquire(action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    acquireRead()
+    try {
+        return action()
+    } finally {
+        releaseRead()
+    }
+}
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withWriteLock(action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    lockWrite()
+    try {
+        return action()
+    } finally {
+        unlockWrite()
+    }
+}
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withReadAcquire(key: T, action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    acquireRead(key)
+    try {
+        return action()
+    } finally {
+        releaseRead(key)
+    }
+}
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withReadAcquires(keys: Iterable<T>, action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    val acquired = mutableSetOf<T>()
+    try {
+        keys.forEach {
+            acquireRead(it)
+            acquired.add(it)
+        }
+        return action()
+    } finally {
+        acquired.forEach {
+            releaseRead(it)
+        }
+    }
+}
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withReadAcquires(vararg keys: T, action: () -> R): R = withReadAcquires(keys.asIterable(), action)
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withWriteLock(key: T, action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    lockWrite(key)
+    try {
+        return action()
+    } finally {
+        unlockWrite(key)
+    }
+}
+
+@OptIn(ExperimentalContracts::class)
+suspend inline fun <T, R> SmartKeyRWLocker<T>.withWriteLocks(keys: Iterable<T>, action: () -> R): R {
+    contract {
+        callsInPlace(action, InvocationKind.EXACTLY_ONCE)
+    }
+
+    val locked = mutableSetOf<T>()
+    try {
+        keys.forEach {
+            lockWrite(it)
+            locked.add(it)
+        }
+        return action()
+    } finally {
+        locked.forEach {
+            unlockWrite(it)
+        }
+    }
+}

coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/SmartRWLocker.kt

@@ -1,5 +1,6 @@
 package dev.inmo.micro_utils.coroutines
 
+import kotlinx.coroutines.CancellationException
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.InvocationKind
 import kotlin.contracts.contract
@@ -7,9 +8,10 @@ import kotlin.contracts.contract
 /**
  * Composite mutex which works with next rules:
  *
- * * [acquireRead] require to [writeMutex] be free. Then it will take one lock from [readSemaphore]
+ * * [acquireRead] require to [writeMutex] to be free. Then it will take one lock from [readSemaphore]
  * * [releaseRead] will just free up one permit in [readSemaphore]
- * * [lockWrite] will lock [writeMutex] and then await while all [readSemaphore] will be freed
+ * * [lockWrite] will lock [writeMutex] and then await while all [readSemaphore] will be freed. If coroutine will be
+ * cancelled during read semaphore freeing, locking will be cancelled too with [SmartMutex.Mutable.unlock]ing of [writeMutex]
  * * [unlockWrite] will just unlock [writeMutex]
  */
 class SmartRWLocker(private val readPermits: Int = Int.MAX_VALUE, writeIsLocked: Boolean = false) {
@@ -39,7 +41,12 @@ class SmartRWLocker(private val readPermits: Int = Int.MAX_VALUE, writeIsLocked:
      */
     suspend fun lockWrite() {
         _writeMutex.lock()
+        try {
             _readSemaphore.acquire(readPermits)
+        } catch (e: CancellationException) {
+            _writeMutex.unlock()
+            throw e
+        }
     }
 
     /**

coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/SmartRWLockerExtensions.kt

@@ -0,0 +1,23 @@
+package dev.inmo.micro_utils.coroutines
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+
+suspend inline fun alsoWithUnlockingOnSuccess(
+    vararg lockers: SmartRWLocker,
+    block: suspend () -> Unit
+): Result<Unit> {
+    return runCatching {
+        block()
+    }.onSuccess {
+        lockers.forEach { it.unlockWrite() }
+    }
+}
+
+fun alsoWithUnlockingOnSuccessAsync(
+    scope: CoroutineScope,
+    vararg lockers: SmartRWLocker,
+    block: suspend () -> Unit
+): Job = scope.launchLoggingDropExceptions {
+    alsoWithUnlockingOnSuccess(*lockers, block = block)
+}

coroutines/src/commonMain/kotlin/dev/inmo/micro_utils/coroutines/SmartSemaphore.kt

@@ -24,6 +24,7 @@ import kotlin.contracts.contract
  * [Mutable] creator
  */
 sealed interface SmartSemaphore {
+    val maxPermits: Int
     val permitsStateFlow: StateFlow<Int>
 
     /**
@@ -36,7 +37,7 @@ sealed interface SmartSemaphore {
     /**
      * Immutable variant of [SmartSemaphore]. In fact will depend on the owner of [permitsStateFlow]
      */
-    class Immutable(override val permitsStateFlow: StateFlow<Int>) : SmartSemaphore
+    class Immutable(override val permitsStateFlow: StateFlow<Int>, override val maxPermits: Int) : SmartSemaphore
 
     /**
      * Mutable variant of [SmartSemaphore]. With that variant you may [lock] and [unlock]. Besides, you may create
@@ -44,15 +45,16 @@ sealed interface SmartSemaphore {
      *
      * @param locked Preset state of [freePermits] and its internal [_freePermitsStateFlow]
      */
-    class Mutable(private val permits: Int, acquiredPermits: Int = 0) : SmartSemaphore {
+    class Mutable(permits: Int, acquiredPermits: Int = 0) : SmartSemaphore {
+        override val maxPermits: Int = permits
         private val _freePermitsStateFlow = SpecialMutableStateFlow<Int>(permits - acquiredPermits)
         override val permitsStateFlow: StateFlow<Int> = _freePermitsStateFlow.asStateFlow()
 
         private val internalChangesMutex = Mutex(false)
 
-        fun immutable() = Immutable(permitsStateFlow)
+        fun immutable() = Immutable(permitsStateFlow, maxPermits)
 
-        private fun checkedPermits(permits: Int) = permits.coerceIn(1 .. this.permits)
+        private fun checkedPermits(permits: Int) = permits.coerceIn(1 .. this.maxPermits)
 
         /**
          * Holds call until this [SmartSemaphore] will be re-locked. That means that current method will
@@ -126,10 +128,10 @@ sealed interface SmartSemaphore {
          */
         suspend fun release(permits: Int = 1): Boolean {
             val checkedPermits = checkedPermits(permits)
-            return if (_freePermitsStateFlow.value < this.permits) {
+            return if (_freePermitsStateFlow.value < this.maxPermits) {
                 internalChangesMutex.withLock {
-                    if (_freePermitsStateFlow.value < this.permits) {
+                    if (_freePermitsStateFlow.value < this.maxPermits) {
-                        _freePermitsStateFlow.value = minOf(_freePermitsStateFlow.value + checkedPermits, this.permits)
+                        _freePermitsStateFlow.value = minOf(_freePermitsStateFlow.value + checkedPermits, this.maxPermits)
                         true
                     } else {
                         false
@@ -166,3 +168,4 @@ suspend inline fun <T> SmartSemaphore.Mutable.withAcquire(permits: Int = 1, acti
  * the fact that some other parties may lock it again
  */
 suspend fun SmartSemaphore.waitRelease(permits: Int = 1) = permitsStateFlow.first { it >= permits }
+suspend fun SmartSemaphore.waitReleaseAll() = permitsStateFlow.first { it == maxPermits }

coroutines/src/commonTest/kotlin/RealTimeOut.kt

@@ -0,0 +1,12 @@
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeout
+import kotlin.time.Duration
+
+suspend fun <T> realWithTimeout(time: Duration, block: suspend () -> T): T {
+    return withContext(Dispatchers.Default.limitedParallelism(1)) {
+        withTimeout(time) {
+            block()
+        }
+    }
+}

coroutines/src/commonTest/kotlin/SmartKeyRWLockerTests.kt

@@ -0,0 +1,196 @@
+import dev.inmo.micro_utils.coroutines.*
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFails
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.seconds
+
+class SmartKeyRWLockerTests {
+    @Test
+    fun writeLockKeyFailedOnGlobalWriteLockTest() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+        val testKey = "test"
+        locker.lockWrite()
+
+        assertTrue { locker.isWriteLocked() }
+
+        assertFails {
+            realWithTimeout(1.seconds) {
+                locker.lockWrite(testKey)
+            }
+        }
+        assertFalse { locker.isWriteLocked(testKey) }
+
+        locker.unlockWrite()
+        assertFalse { locker.isWriteLocked() }
+
+        realWithTimeout(1.seconds) {
+            locker.lockWrite(testKey)
+        }
+        assertTrue { locker.isWriteLocked(testKey) }
+        assertTrue { locker.unlockWrite(testKey) }
+        assertFalse { locker.isWriteLocked(testKey) }
+    }
+    @Test
+    fun writeLockKeyFailedOnGlobalReadLockTest() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+        val testKey = "test"
+        locker.acquireRead()
+
+        assertEquals(Int.MAX_VALUE - 1, locker.readSemaphore().freePermits)
+
+        assertFails {
+            realWithTimeout(1.seconds) {
+                locker.lockWrite(testKey)
+            }
+        }
+        assertFalse { locker.isWriteLocked(testKey) }
+
+        locker.releaseRead()
+        assertEquals(Int.MAX_VALUE, locker.readSemaphore().freePermits)
+
+        realWithTimeout(1.seconds) {
+            locker.lockWrite(testKey)
+        }
+        assertTrue { locker.isWriteLocked(testKey) }
+        assertTrue { locker.unlockWrite(testKey) }
+        assertFalse { locker.isWriteLocked(testKey) }
+    }
+    @Test
+    fun readLockFailedOnWriteLockKeyTest() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+        val testKey = "test"
+        locker.lockWrite(testKey)
+
+        assertTrue { locker.isWriteLocked(testKey) }
+
+        assertFails {
+            realWithTimeout(1.seconds) {
+                locker.acquireRead()
+            }
+        }
+        assertEquals(locker.readSemaphore().maxPermits - 1, locker.readSemaphore().freePermits)
+
+        locker.unlockWrite(testKey)
+        assertFalse { locker.isWriteLocked(testKey) }
+
+        realWithTimeout(1.seconds) {
+            locker.acquireRead()
+        }
+        assertEquals(locker.readSemaphore().maxPermits - 1, locker.readSemaphore().freePermits)
+        assertTrue { locker.releaseRead() }
+        assertEquals(locker.readSemaphore().maxPermits, locker.readSemaphore().freePermits)
+    }
+    @Test
+    fun writeLockFailedOnWriteLockKeyTest() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+        val testKey = "test"
+        locker.lockWrite(testKey)
+
+        assertTrue { locker.isWriteLocked(testKey) }
+
+        assertFails {
+            realWithTimeout(1.seconds) {
+                locker.lockWrite()
+            }
+        }
+        assertFalse(locker.isWriteLocked())
+
+        locker.unlockWrite(testKey)
+        assertFalse { locker.isWriteLocked(testKey) }
+
+        realWithTimeout(1.seconds) {
+            locker.lockWrite()
+        }
+        assertTrue(locker.isWriteLocked())
+        assertTrue { locker.unlockWrite() }
+        assertFalse(locker.isWriteLocked())
+    }
+    @Test
+    fun readsBlockingGlobalWrite() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+
+        val testKeys = (0 until 100).map { "test$it" }
+
+        for (i in testKeys.indices) {
+            val it = testKeys[i]
+            locker.acquireRead(it)
+            val previous = testKeys.take(i)
+            val next = testKeys.drop(i + 1)
+
+            previous.forEach {
+                assertTrue { locker.readSemaphoreOrNull(it) ?.freePermits == Int.MAX_VALUE - 1 }
+            }
+            next.forEach {
+                assertTrue { locker.readSemaphoreOrNull(it) ?.freePermits == null }
+            }
+        }
+
+        for (i in testKeys.indices) {
+            val it = testKeys[i]
+            assertFails {
+                realWithTimeout(13.milliseconds) { locker.lockWrite() }
+            }
+            val readPermitsBeforeLock = locker.readSemaphore().freePermits
+            realWithTimeout(1.seconds) { locker.acquireRead() }
+            locker.releaseRead()
+            assertEquals(readPermitsBeforeLock, locker.readSemaphore().freePermits)
+
+            locker.releaseRead(it)
+        }
+
+        assertTrue { locker.readSemaphore().freePermits == Int.MAX_VALUE }
+        realWithTimeout(1.seconds) { locker.lockWrite() }
+        assertFails {
+            realWithTimeout(13.milliseconds) { locker.acquireRead() }
+        }
+        assertTrue { locker.unlockWrite() }
+        assertTrue { locker.readSemaphore().freePermits == Int.MAX_VALUE }
+    }
+    @Test
+    fun writesBlockingGlobalWrite() = runTest {
+        val locker = SmartKeyRWLocker<String>()
+
+        val testKeys = (0 until 100).map { "test$it" }
+
+        for (i in testKeys.indices) {
+            val it = testKeys[i]
+            locker.lockWrite(it)
+            val previous = testKeys.take(i)
+            val next = testKeys.drop(i + 1)
+
+            previous.forEach {
+                assertTrue { locker.writeMutexOrNull(it) ?.isLocked == true }
+            }
+            next.forEach {
+                assertTrue { locker.writeMutexOrNull(it) ?.isLocked != true }
+            }
+        }
+
+        for (i in testKeys.indices) {
+            val it = testKeys[i]
+            assertFails { realWithTimeout(13.milliseconds) { locker.lockWrite() } }
+
+            val readPermitsBeforeLock = locker.readSemaphore().freePermits
+            assertFails { realWithTimeout(13.milliseconds) { locker.acquireRead() } }
+            assertEquals(readPermitsBeforeLock, locker.readSemaphore().freePermits)
+
+            locker.unlockWrite(it)
+        }
+
+        assertTrue { locker.readSemaphore().freePermits == Int.MAX_VALUE }
+        realWithTimeout(1.seconds) { locker.lockWrite() }
+        assertFails {
+            realWithTimeout(13.milliseconds) { locker.acquireRead() }
+        }
+        assertTrue { locker.unlockWrite() }
+        assertTrue { locker.readSemaphore().freePermits == Int.MAX_VALUE }
+    }
+}

coroutines/src/commonTest/kotlin/SmartRWLockerTests.kt

@@ -6,7 +6,10 @@ import kotlinx.coroutines.sync.withLock
 import kotlinx.coroutines.test.runTest
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertFails
+import kotlin.test.assertFalse
 import kotlin.test.assertTrue
+import kotlin.time.Duration.Companion.seconds
 
 class SmartRWLockerTests {
     @Test
@@ -148,4 +151,17 @@ class SmartRWLockerTests {
             assertEquals(false, locker.writeMutex.isLocked)
         }
     }
+
+    @Test
+    fun exceptionOnLockingWillNotLockLocker() = runTest {
+        val locker = SmartRWLocker()
+
+        locker.acquireRead()
+        assertFails {
+            realWithTimeout(1.seconds) {
+                locker.lockWrite()
+            }
+        }
+        assertFalse { locker.writeMutex.isLocked }
+    }
 }

gradle.properties

@@ -15,5 +15,5 @@ crypto_js_version=4.1.1
 # Project data
 
 group=dev.inmo
-version=0.25.2
+version=0.25.3
-android_code_version=292
+android_code_version=293

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 
-kt = "2.1.10"
+kt = "2.1.20"
 kt-serialization = "1.8.0"
 kt-coroutines = "1.10.1"
 
@@ -23,7 +23,7 @@ koin = "4.0.2"
 
 okio = "3.10.2"
 
-ksp = "2.1.10-1.0.31"
+ksp = "2.1.20-1.0.31"
 kotlin-poet = "1.18.1"
 
 versions = "0.51.0"

repos/cache/src/commonMain/kotlin/dev/inmo/micro_utils/repos/cache/CacheRepo.kt

@@ -1,7 +1,9 @@
 package dev.inmo.micro_utils.repos.cache
 
+import dev.inmo.micro_utils.coroutines.SmartRWLocker
 import dev.inmo.micro_utils.coroutines.launchLoggingDropExceptions
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
 
 interface InvalidatableRepo {
     /**

repos/cache/src/commonMain/kotlin/dev/inmo/micro_utils/repos/cache/full/FullKeyValuesCacheRepo.kt

@@ -11,7 +11,6 @@ import dev.inmo.micro_utils.repos.*
 import dev.inmo.micro_utils.repos.annotations.OverrideRequireManualInvalidation
 import dev.inmo.micro_utils.repos.cache.util.ActualizeAllClearMode
 import dev.inmo.micro_utils.repos.cache.util.actualizeAll
-import dev.inmo.micro_utils.repos.pagination.maxPagePagination
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.*

repos/cache/src/commonMain/kotlin/dev/inmo/micro_utils/repos/cache/full/direct/DirectFullKeyValueCacheRepo.kt

@@ -8,9 +8,6 @@ import dev.inmo.micro_utils.pagination.Pagination
 import dev.inmo.micro_utils.pagination.PaginationResult
 import dev.inmo.micro_utils.repos.*
 import dev.inmo.micro_utils.repos.annotations.OverrideRequireManualInvalidation
-import dev.inmo.micro_utils.repos.cache.full.FullKeyValueCacheRepo
-import dev.inmo.micro_utils.repos.cache.full.FullReadKeyValueCacheRepo
-import dev.inmo.micro_utils.repos.cache.full.FullWriteKeyValueCacheRepo
 import dev.inmo.micro_utils.repos.cache.util.actualizeAll
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers

repos/cache/src/commonMain/kotlin/dev/inmo/micro_utils/repos/cache/full/direct/DirectFullKeyValuesCacheRepo.kt

@@ -1,6 +1,5 @@
 package dev.inmo.micro_utils.repos.cache.full.direct
 
-import dev.inmo.micro_utils.common.*
 import dev.inmo.micro_utils.coroutines.SmartRWLocker
 import dev.inmo.micro_utils.coroutines.launchLoggingDropExceptions
 import dev.inmo.micro_utils.coroutines.withReadAcquire

settings.gradle

@@ -3,6 +3,7 @@ rootProject.name='micro_utils'
 String[] includes = [
     ":common",
     ":common:compose",
+    ":transactions",
     ":matrix",
     ":safe_wrapper",
     ":crypto",

startup/launcher/build.gradle

@@ -1,13 +1,19 @@
 plugins {
     id "org.jetbrains.kotlin.multiplatform"
     id "org.jetbrains.kotlin.plugin.serialization"
-    id "application"
     id "com.google.devtools.ksp"
 }
 
 apply from: "$mppJvmJsLinuxMingwProject"
 
 kotlin {
+    jvm {
+        binaries {
+            executable {
+                mainClass.set("dev.inmo.micro_utils.startup.launcher.MainKt")
+            }
+        }
+    }
     sourceSets {
         commonMain {
             dependencies {
@@ -23,10 +29,6 @@ kotlin {
     }
 }
 
-application {
-    mainClassName = "dev.inmo.micro_utils.startup.launcher.MainKt"
-}
-
 java {
     sourceCompatibility = JavaVersion.VERSION_17
     targetCompatibility = JavaVersion.VERSION_17

transactions/build.gradle

@@ -0,0 +1,7 @@
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+    id "org.jetbrains.kotlin.plugin.serialization"
+    id "com.android.library"
+}
+
+apply from: "$mppJvmJsAndroidLinuxMingwLinuxArm64Project"

transactions/src/commonMain/kotlin/TransactionsDSL.kt

@@ -0,0 +1,82 @@
+package dev.inmo.micro_utils.transactions
+
+typealias TransactionDSLRollbackLambda = suspend (Throwable) -> Unit
+class TransactionsDSL internal constructor() {
+    internal val rollbackActions = LinkedHashSet<TransactionDSLRollbackLambda>()
+
+    internal fun addRollbackAction(rollbackAction: TransactionDSLRollbackLambda) {
+        rollbackActions.add(rollbackAction)
+    }
+}
+class RollbackContext<T> internal constructor (
+    val actionResult: T,
+    val error: Throwable
+)
+
+/**
+ * Calls [action] and, if it succeeded - saving [rollback] action for future usage for cases when some other
+ * action or even main one throwing an error
+ *
+ * @param rollback Will be called if
+ */
+suspend fun <T> TransactionsDSL.rollableBackOperation(
+    rollback: suspend RollbackContext<T>.() -> Unit,
+    action: suspend () -> T
+): T {
+    return runCatching { action() }
+        .onSuccess {
+            addRollbackAction { e ->
+                val context = RollbackContext(it, e)
+                context.rollback()
+            }
+        }
+        .getOrThrow()
+}
+
+/**
+ * Starts transaction with opportunity to add actions [rollableBackOperation]. How to use:
+ *
+ * ```kotlin
+ * doSuspendTransaction {
+ *     println("start of action")
+ *
+ *     withRollback({ // it - result of action
+ *         // some rollback action
+ *     }) {
+ *         // Some action with rollback
+ *     }
+ *
+ *     withRollback({
+ *          repository.delete(it) // it - result of createSomething, if it completes successfully
+ *     }) {
+ *          repository.createSomething()
+ *     }
+ *
+ *     withRollback({
+ *         // will not be triggered due to error in action
+ *     }) {
+ *         error("It is just a simple error") // Will trigger rolling back previously successfully completed actions
+ *     }
+ * }
+ * ```
+ *
+ * @param onRollbackStepError Will be called if rollback action throwing some error
+ */
+suspend fun <T> doSuspendTransaction(
+    onRollbackStepError: suspend (Throwable) -> Unit = { },
+    block: suspend TransactionsDSL.() -> T
+): Result<T> {
+    val transactionsDSL = TransactionsDSL()
+
+    return runCatching {
+        transactionsDSL.block()
+    }.onFailure { e ->
+        transactionsDSL.rollbackActions.forEach {
+            runCatching {
+                it.invoke(e)
+            }.onFailure { ee ->
+                onRollbackStepError(ee)
+            }
+        }
+    }
+}

transactions/src/commonTest/kotlin/TransactionsDSLTests.kt

@@ -0,0 +1,93 @@
+import dev.inmo.micro_utils.transactions.doSuspendTransaction
+import dev.inmo.micro_utils.transactions.rollableBackOperation
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class TransactionsDSLTests {
+    @Test
+    fun successfulTest() = runTest {
+        val dataCollections = Array(100) {
+            Triple(
+                it, // expected data
+                false, // has rollback happen or not
+                -1 // actual data
+            )
+        }
+
+        val actionResult = doSuspendTransaction {
+            dataCollections.forEachIndexed { i, _ ->
+                val resultData = rollableBackOperation({
+                    dataCollections[i] = actionResult.copy(second = true)
+                }) {
+                    val result = dataCollections[i]
+                    dataCollections[i] = result.copy(
+                        third = i
+                    )
+                    dataCollections[i]
+                }
+                assertEquals(dataCollections[i], resultData)
+                assertTrue(dataCollections[i] === resultData)
+            }
+            true
+        }.getOrThrow()
+
+        dataCollections.forEachIndexed { i, triple ->
+            assertFalse(triple.second)
+            assertEquals(triple.first, i)
+            assertEquals(i, triple.third)
+        }
+        assertTrue(actionResult)
+    }
+    @Test
+    fun fullTest() = runTest {
+        val testsCount = 100
+        for (testNumber in 0 until testsCount) {
+            val error = IllegalStateException("Test must fail at $testNumber")
+            val dataCollections = Array(testsCount) {
+                Triple(
+                    it, // expected data
+                    false, // has rollback happen or not
+                    -1 // actual data
+                )
+            }
+
+            val actionResult = doSuspendTransaction {
+                dataCollections.forEachIndexed { i, _ ->
+                    val resultData = rollableBackOperation({
+                        assertTrue(error === this.error)
+                        dataCollections[i] = actionResult.copy(second = true)
+                    }) {
+                        if (i == testNumber) throw error
+                        val result = dataCollections[i]
+                        dataCollections[i] = result.copy(
+                            third = i
+                        )
+                        dataCollections[i]
+                    }
+                    assertEquals(dataCollections[i], resultData)
+                    assertTrue(dataCollections[i] === resultData)
+                }
+                true
+            }.getOrElse {
+                assertTrue(it === error)
+                true
+            }
+
+            dataCollections.forEachIndexed { i, triple ->
+                if (i < testNumber) {
+                    assertTrue(triple.second)
+                    assertEquals(triple.first, i)
+                    assertEquals(i, triple.third)
+                } else {
+                    assertFalse(triple.second)
+                    assertEquals(triple.first, i)
+                    assertEquals(-1, triple.third)
+                }
+            }
+            assertTrue(actionResult)
+        }
+    }
+}