Add module for simulation-specific code for OpenDC

This change introduces a new module in the OpenDC namespace where
simulation-specific code will be placed. We will move away from the
odcsim naming to prevent getting confused users due to this complex
naming scheme.

Furthermore, this module will live in the org.opendc package instead of
the com.atlarge.opendc to further reduce depth of the packages.

2 files changed, 78 insertions, 0 deletions

diff --git a/simulator/opendc/opendc-simulator/build.gradle.kts b/simulator/opendc/opendc-simulator/build.gradle.kts
new file mode 100644
index 00000000..a740dcf3
--- /dev/null
+++ b/simulator/opendc/opendc-simulator/build.gradle.kts
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+description = "Simulation-specific code for use in OpenDC"
+
+/* Build configuration */
+plugins {
+    `kotlin-library-convention`
+}
+
+dependencies {
+    api("org.jetbrains.kotlinx:kotlinx-coroutines-test:${Library.KOTLINX_COROUTINES}")
+}
diff --git a/simulator/opendc/opendc-simulator/src/main/kotlin/org/opendc/simulator/utils/DelayControllerClockAdapter.kt b/simulator/opendc/opendc-simulator/src/main/kotlin/org/opendc/simulator/utils/DelayControllerClockAdapter.kt
new file mode 100644
index 00000000..84c18e87
--- /dev/null
+++ b/simulator/opendc/opendc-simulator/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
+}