merge: Extract scheduler from simulation coroutine dispatcher (#106)

This pull request extracts the scheduler from the `SimulationCoroutineDispatcher` into 
a separate `SimulationScheduler` class which allows users to re-use the scheduler 
between different coroutine dispatchers.

We implement the `SimulationScheduler` in Java, removing the explicit dependency on 
Kotlin or `kotlinx-coroutines`. The scheduler uses a separate specialized priority queue 
implementation that eliminates allocation in the hot path of the simulator.

## Implementation Notes :hammer_and_pick:

* Add Java-based simulator core
* Use SimulationScheduler in coroutine dispatcher
* Rename runBlockingSimulation to runSimulation

## External Dependencies :four_leaf_clover:

* N/A 

## Breaking API Changes :warning:

* The Kotlin API for simulation has been moved to `org.opendc.simulator.kotlin`.
* `runBlockingSImulation` renamed to `runSimulation`

1 files changed, 6 insertions, 6 deletions

diff --git a/opendc-common/src/test/kotlin/org/opendc/common/util/PacerTest.kt b/opendc-common/src/test/kotlin/org/opendc/common/util/PacerTest.kt
index 1cd435f6..de9fd472 100644
--- a/opendc-common/src/test/kotlin/org/opendc/common/util/PacerTest.kt
+++ b/opendc-common/src/test/kotlin/org/opendc/common/util/PacerTest.kt
@@ -26,7 +26,7 @@ import kotlinx.coroutines.delay
 import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
-import org.opendc.simulator.core.runBlockingSimulation
+import org.opendc.simulator.kotlin.runSimulation
 import java.time.Clock
 import kotlin.coroutines.EmptyCoroutineContext
 
@@ -43,7 +43,7 @@ class PacerTest {
     fun testSingleEnqueue() {
         var count = 0
 
-        runBlockingSimulation {
+        runSimulation {
             val pacer = Pacer(coroutineContext, clock, quantum = 100) {
                 count++
             }
@@ -58,7 +58,7 @@ class PacerTest {
     fun testCascade() {
         var count = 0
 
-        runBlockingSimulation {
+        runSimulation {
             val pacer = Pacer(coroutineContext, clock, quantum = 100) {
                 count++
             }
@@ -76,7 +76,7 @@ class PacerTest {
     fun testCancel() {
         var count = 0
 
-        runBlockingSimulation {
+        runSimulation {
             val pacer = Pacer(coroutineContext, clock, quantum = 100) {
                 count++
             }
@@ -94,7 +94,7 @@ class PacerTest {
     fun testCancelWithoutPending() {
         var count = 0
 
-        runBlockingSimulation {
+        runSimulation {
             val pacer = Pacer(coroutineContext, clock, quantum = 100) {
                 count++
             }
@@ -112,7 +112,7 @@ class PacerTest {
     fun testSubsequent() {
         var count = 0
 
-        runBlockingSimulation {
+        runSimulation {
             val pacer = Pacer(coroutineContext, clock, quantum = 100) {
                 count++
             }