From 977620f1b5218cc8a041742f970974a4bfff29cc Mon Sep 17 00:00:00 2001
From: Linnea Gräf <nea@nea.moe>
Date: Sat, 5 Oct 2024 12:06:23 +0200
Subject: Add minion hopper tracker

---
 src/main/kotlin/moe/nea/ledger/ExpiringValue.kt | 28 +++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 src/main/kotlin/moe/nea/ledger/ExpiringValue.kt

(limited to 'src/main/kotlin/moe/nea/ledger/ExpiringValue.kt')

diff --git a/src/main/kotlin/moe/nea/ledger/ExpiringValue.kt b/src/main/kotlin/moe/nea/ledger/ExpiringValue.kt
new file mode 100644
index 0000000..dac4751
--- /dev/null
+++ b/src/main/kotlin/moe/nea/ledger/ExpiringValue.kt
@@ -0,0 +1,28 @@
+package moe.nea.ledger
+
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.nanoseconds
+
+class ExpiringValue<T>(private val value: T) {
+	val lastSeenAt: Long = System.nanoTime()
+	val age get() = (System.nanoTime() - lastSeenAt).nanoseconds
+	var taken = false
+	fun get(expiry: Duration): T? {
+		return if (!taken && expiry > age) value
+		else null
+	}
+
+	companion object {
+		fun <T> empty(): ExpiringValue<T> {
+			val value = ExpiringValue(Unit)
+			value.take()
+			@Suppress("UNCHECKED_CAST")
+			return value as ExpiringValue<T>
+		}
+	}
+
+	fun consume(expiry: Duration): T? = get(expiry).also { take() }
+	fun take() {
+		taken = true
+	}
+}
\ No newline at end of file
-- 
cgit