Merge pull request #45 from atlarge-research/refactor/decouple

Decouple simulation logic from OpenDC Compute

1 files changed, 46 insertions, 0 deletions

diff --git a/simulator/opendc-simulator/opendc-simulator-core/src/main/kotlin/org/opendc/simulator/utils/DelayControllerClockAdapter.kt b/simulator/opendc-simulator/opendc-simulator-core/src/main/kotlin/org/opendc/simulator/utils/DelayControllerClockAdapter.kt
new file mode 100644
index 00000000..84c18e87
--- /dev/null
+++ b/simulator/opendc-simulator/opendc-simulator-core/src/main/kotlin/org/opendc/simulator/utils/DelayControllerClockAdapter.kt
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.simulator.utils
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.DelayController
+import java.time.Clock
+import java.time.Instant
+import java.time.ZoneId
+
+/**
+ * A virtual [Clock] that abstracts accesses to [DelayController]'s virtual clock.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+public class DelayControllerClockAdapter(
+    private val delayController: DelayController,
+    private val zone: ZoneId = ZoneId.systemDefault()
+) : Clock() {
+    override fun getZone(): ZoneId = zone
+
+    override fun withZone(zone: ZoneId): Clock = DelayControllerClockAdapter(delayController, zone)
+
+    override fun instant(): Instant = Instant.ofEpochMilli(millis())
+
+    override fun millis(): Long = delayController.currentTime
+}