simulator: Introduce SimulationCoroutineDispatcher

This change introduces the SimulationCoroutineDispatcher implementation
which replaces the TestCoroutineDispatcher for running single-threaded
simulations.

Previously, we used the TestCoroutineDispatcher from the
kotlinx-coroutines-test modules for running simulations. However, this
module is aimed at coroutine tests and not at simulations.

In particular, having to construct a Clock object each time for the
TestCoroutineDispatcher caused a lot of unnecessary lines. With the new
approach, the SimulationCoroutineDispatcher automatically exposes a
usable Clock object.

In addition to ergonomic benefits, the SimulationCoroutineDispatcher is
much faster than the TestCoroutineDispatcher due to the assumption that
simulations run in only a single thread. As a result, the dispatcher
does not need to perform synchronization and can use the fast
PriorityQueue implementation.

8 files changed, 8 insertions, 8 deletions

diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/jmh/kotlin/org/opendc/simulator/resources/SimResourceBenchmarks.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/jmh/kotlin/org/opendc/simulator/resources/SimResourceBenchmarks.kt
index f2eea97c..ab0abe23 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/jmh/kotlin/org/opendc/simulator/resources/SimResourceBenchmarks.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/jmh/kotlin/org/opendc/simulator/resources/SimResourceBenchmarks.kt
@@ -26,7 +26,7 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.TestCoroutineScope
 import kotlinx.coroutines.test.runBlockingTest
-import org.opendc.simulator.utils.DelayControllerClockAdapter
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 import org.openjdk.jmh.annotations.*
 import java.time.Clock
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt
index bf8c6d1f..cc85d5d9 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceAggregatorMaxMinTest.kt
@@ -31,9 +31,9 @@ import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertAll
 import org.junit.jupiter.api.assertThrows
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
 import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt
index 030a0f6b..c8c1a9d7 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceContextTest.kt
@@ -26,7 +26,7 @@ import io.mockk.*
 import kotlinx.coroutines.*
 import kotlinx.coroutines.test.runBlockingTest
 import org.junit.jupiter.api.*
-import org.opendc.simulator.utils.DelayControllerClockAdapter
+import org.opendc.simulator.core.DelayControllerClockAdapter
 
 /**
  * A test suite for the [SimAbstractResourceContext] class.
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt
index dbba6160..06b1b87b 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSourceTest.kt
@@ -30,9 +30,9 @@ import kotlinx.coroutines.*
 import kotlinx.coroutines.test.runBlockingTest
 import org.junit.jupiter.api.*
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
 import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt
index 9a40edc4..3acad3f7 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchExclusiveTest.kt
@@ -31,9 +31,9 @@ import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertAll
 import org.junit.jupiter.api.assertThrows
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimSpeedConsumerAdapter
 import org.opendc.simulator.resources.consumer.SimTraceConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt
index 5f4fd187..59e80e56 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceSwitchMaxMinTest.kt
@@ -31,8 +31,8 @@ import kotlinx.coroutines.test.runBlockingTest
 import kotlinx.coroutines.yield
 import org.junit.jupiter.api.*
 import org.junit.jupiter.api.Assertions.assertEquals
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimTraceConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt
index 38598f6b..aeaab6af 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimResourceTransformerTest.kt
@@ -31,8 +31,8 @@ import kotlinx.coroutines.test.runBlockingTest
 import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**
diff --git a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt
index 4d6b19ee..38dc0d48 100644
--- a/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt
+++ b/simulator/opendc-simulator/opendc-simulator-resources/src/test/kotlin/org/opendc/simulator/resources/SimWorkConsumerTest.kt
@@ -26,8 +26,8 @@ import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.test.runBlockingTest
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
+import org.opendc.simulator.core.DelayControllerClockAdapter
 import org.opendc.simulator.resources.consumer.SimWorkConsumer
-import org.opendc.simulator.utils.DelayControllerClockAdapter
 import org.opendc.utils.TimerScheduler
 
 /**