build: Add support for Java 16

This pull request adds support for building OpenDC using Java 16. 

To make this possible, we have upgraded the following dependencies:
- Kotlin from 1.4.3 to 1.5.0
- Jacoco from 0.8.6 to 0.8.7
- Gradle from 7.0 to 7.0.2

2 files changed, 3 insertions, 3 deletions

diff --git a/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt b/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
index f6324e13..e501033a 100644
--- a/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
+++ b/opendc-simulator/opendc-simulator-compute/src/main/kotlin/org/opendc/simulator/compute/SimAbstractMachine.kt
@@ -80,7 +80,7 @@ public abstract class SimAbstractMachine(private val clock: Clock) : SimMachine
     override suspend fun run(workload: SimWorkload, meta: Map<String, Any>): Unit = withContext(context) {
         require(!isTerminated) { "Machine is terminated" }
         val ctx = Context(meta)
-        val totalCapacity = model.cpus.sumByDouble { it.frequency }
+        val totalCapacity = model.cpus.sumOf { it.frequency }
 
         _speed = DoubleArray(model.cpus.size) { 0.0 }
         var totalSpeed = 0.0
diff --git a/opendc-simulator/opendc-simulator-resources/src/main/kotlin/org/opendc/simulator/resources/SimAbstractResourceAggregator.kt b/opendc-simulator/opendc-simulator-resources/src/main/kotlin/org/opendc/simulator/resources/SimAbstractResourceAggregator.kt
index 6ae04f27..653b53e0 100644
--- a/opendc-simulator/opendc-simulator-resources/src/main/kotlin/org/opendc/simulator/resources/SimAbstractResourceAggregator.kt
+++ b/opendc-simulator/opendc-simulator-resources/src/main/kotlin/org/opendc/simulator/resources/SimAbstractResourceAggregator.kt
@@ -82,7 +82,7 @@ public abstract class SimAbstractResourceAggregator(private val scheduler: SimRe
 
                 return if (_remainingWorkFlush < now) {
                     _remainingWorkFlush = now
-                    _inputConsumers.sumByDouble { it._ctx?.remainingWork ?: 0.0 }.also { _remainingWork = it }
+                    _inputConsumers.sumOf { it._ctx?.remainingWork ?: 0.0 }.also { _remainingWork = it }
                 } else {
                     _remainingWork
                 }
@@ -132,7 +132,7 @@ public abstract class SimAbstractResourceAggregator(private val scheduler: SimRe
 
         private fun updateCapacity() {
             // Adjust capacity of output resource
-            context.capacity = _inputConsumers.sumByDouble { it._ctx?.capacity ?: 0.0 }
+            context.capacity = _inputConsumers.sumOf { it._ctx?.capacity ?: 0.0 }
         }
 
         /* Input */