refactor: Use InstantSource as time source

This change updates the modules of OpenDC to always accept
the `InstantSource` interface as source of time. Previously we used
`java.time.Clock`, but this class is bound to a time zone which does not
make sense for our use-cases.

Since `java.time.Clock` implements `java.time.InstantSource`, it can be
used in places that require an `InstantSource` as parameter. Conversion
from `InstantSource` to `Clock` is also possible by invoking
`InstantSource#withZone`.

2 files changed, 4 insertions, 4 deletions

diff --git a/opendc-common/src/main/kotlin/org/opendc/common/util/Pacer.kt b/opendc-common/src/main/kotlin/org/opendc/common/util/Pacer.kt
index edf607d2..b6141db1 100644
--- a/opendc-common/src/main/kotlin/org/opendc/common/util/Pacer.kt
+++ b/opendc-common/src/main/kotlin/org/opendc/common/util/Pacer.kt
@@ -26,7 +26,7 @@ import kotlinx.coroutines.Delay
 import kotlinx.coroutines.DisposableHandle
 import kotlinx.coroutines.InternalCoroutinesApi
 import java.lang.Runnable
-import java.time.Clock
+import java.time.InstantSource
 import kotlin.coroutines.ContinuationInterceptor
 import kotlin.coroutines.CoroutineContext
 
@@ -40,7 +40,7 @@ import kotlin.coroutines.CoroutineContext
  */
 public class Pacer(
     private val context: CoroutineContext,
-    private val clock: Clock,
+    private val clock: InstantSource,
     private val quantum: Long,
     private val process: (Long) -> Unit
 ) {
diff --git a/opendc-common/src/main/kotlin/org/opendc/common/util/TimerScheduler.kt b/opendc-common/src/main/kotlin/org/opendc/common/util/TimerScheduler.kt
index 44d6010f..864512d3 100644
--- a/opendc-common/src/main/kotlin/org/opendc/common/util/TimerScheduler.kt
+++ b/opendc-common/src/main/kotlin/org/opendc/common/util/TimerScheduler.kt
@@ -25,7 +25,7 @@ package org.opendc.common.util
 import kotlinx.coroutines.Delay
 import kotlinx.coroutines.DisposableHandle
 import kotlinx.coroutines.InternalCoroutinesApi
-import java.time.Clock
+import java.time.InstantSource
 import java.util.ArrayDeque
 import java.util.PriorityQueue
 import kotlin.coroutines.ContinuationInterceptor
@@ -37,7 +37,7 @@ import kotlin.coroutines.CoroutineContext
  * @param context The [CoroutineContext] to run the tasks with.
  * @param clock The clock to keep track of the time.
  */
-public class TimerScheduler<T>(private val context: CoroutineContext, private val clock: Clock) {
+public class TimerScheduler<T>(private val context: CoroutineContext, private val clock: InstantSource) {
     /**
      * The [Delay] instance that provides scheduled execution of [Runnable]s.
      */