From f791cc6f9cff3a4f98d2c792d64ce126a939f013 Mon Sep 17 00:00:00 2001
From: Koitharu <nvasya95@gmail.com>
Date: Sat, 9 Sep 2023 16:36:13 +0300
Subject: [PATCH] Added SoftSuspendLazy class

---
 .../kotatsu/parsers/util/SoftSuspendLazy.kt   | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 src/main/kotlin/org/koitharu/kotatsu/parsers/util/SoftSuspendLazy.kt

diff --git a/src/main/kotlin/org/koitharu/kotatsu/parsers/util/SoftSuspendLazy.kt b/src/main/kotlin/org/koitharu/kotatsu/parsers/util/SoftSuspendLazy.kt
new file mode 100644
index 00000000..0a460a0b
--- /dev/null
+++ b/src/main/kotlin/org/koitharu/kotatsu/parsers/util/SoftSuspendLazy.kt
@@ -0,0 +1,33 @@
+package org.koitharu.kotatsu.parsers.util
+
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import java.lang.ref.SoftReference
+
+/**
+ * Like a [SuspendLazy] but with [SoftReference] under the hood
+ */
+class SoftSuspendLazy<T : Any>(
+	private val initializer: suspend () -> T,
+) {
+
+	private val mutex = Mutex()
+	private var cachedValue: SoftReference<T>? = null
+
+	suspend fun get(): T {
+		// fast way
+		cachedValue?.get()?.let {
+			return it
+		}
+		return mutex.withLock {
+			cachedValue?.get()?.let {
+				return it
+			}
+			val result = initializer()
+			cachedValue = SoftReference(result)
+			result
+		}
+	}
+
+	suspend fun tryGet() = runCatchingCancellable { get() }
+}