new mechanism of transactions

CHANGELOG.md

@@ -10,6 +10,8 @@
         to get access to some end-store
         * Add default realization of `StandardVersionsRepoProxy` based on `KeyValue` repos
         * Add realizations of `StandardVersionsRepoProxy` for exposed and android (`SQL` and `SharedPreferences`)
+    * `Commons`:
+        * In Android
 
 ## 0.4.3
 

repos/common/src/main/kotlin/dev/inmo/micro_utils/repos/DatabaseTransactions.kt

@@ -2,15 +2,22 @@ package dev.inmo.micro_utils.repos
 
 import android.database.sqlite.SQLiteDatabase
 import dev.inmo.micro_utils.coroutines.safely
+import kotlinx.coroutines.newSingleThreadContext
 import kotlinx.coroutines.withContext
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.coroutineContext
+
+object InTransaction: CoroutineContext.Element, CoroutineContext.Key<InTransaction> {
+    override val key: CoroutineContext.Key<InTransaction> = InTransaction
+}
 
 suspend fun <T> SQLiteDatabase.transaction(block: suspend SQLiteDatabase.() -> T): T {
-    return withContext(DatabaseCoroutineContext) {
+    return when {
-        when {
+        coroutineContext[InTransaction] == InTransaction -> {
-            inTransaction() -> {
             block()
         }
         else -> {
+            withContext(InTransaction) {
                 beginTransaction()
                 safely(
                     {