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, 2 insertions, 2 deletions

diff --git a/opendc-experiments/opendc-experiments-faas/src/test/kotlin/org/opendc/experiments/faas/FaaSExperiment.kt b/opendc-experiments/opendc-experiments-faas/src/test/kotlin/org/opendc/experiments/faas/FaaSExperiment.kt
index 98328d3e..6f212825 100644
--- a/opendc-experiments/opendc-experiments-faas/src/test/kotlin/org/opendc/experiments/faas/FaaSExperiment.kt
+++ b/opendc-experiments/opendc-experiments-faas/src/test/kotlin/org/opendc/experiments/faas/FaaSExperiment.kt
@@ -34,7 +34,7 @@ import org.opendc.simulator.compute.model.MachineModel
 import org.opendc.simulator.compute.model.MemoryUnit
 import org.opendc.simulator.compute.model.ProcessingNode
 import org.opendc.simulator.compute.model.ProcessingUnit
-import org.opendc.simulator.core.runBlockingSimulation
+import org.opendc.simulator.kotlin.runSimulation
 import java.io.File
 import java.time.Duration
 
@@ -46,7 +46,7 @@ class FaaSExperiment {
      * Smoke test that simulates a small trace.
      */
     @Test
-    fun testSmoke() = runBlockingSimulation {
+    fun testSmoke() = runSimulation {
         val faasService = "faas.opendc.org"
 
         Provisioner(coroutineContext, clock, seed = 0L).use { provisioner ->