feat(sim/flow): Add forwarding flow multiplexer

This change implements a new `FlowMultiplexer` that forwards the inputs
directly to one of the pre-allocated outputs.

1 files changed, 66 insertions, 0 deletions

diff --git a/opendc-simulator/opendc-simulator-flow/src/test/kotlin/org/opendc/simulator/flow2/mux/ForwardingFlowMultiplexerTest.kt b/opendc-simulator/opendc-simulator-flow/src/test/kotlin/org/opendc/simulator/flow2/mux/ForwardingFlowMultiplexerTest.kt
new file mode 100644
index 00000000..a2ed2195
--- /dev/null
+++ b/opendc-simulator/opendc-simulator-flow/src/test/kotlin/org/opendc/simulator/flow2/mux/ForwardingFlowMultiplexerTest.kt
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2022 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.simulator.flow2.mux
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertAll
+import org.opendc.simulator.flow2.FlowEngine
+import org.opendc.simulator.flow2.sink.SimpleFlowSink
+import org.opendc.simulator.flow2.source.TraceFlowSource
+import org.opendc.simulator.kotlin.runSimulation
+
+/**
+ * Test suite for the [ForwardingFlowMultiplexer] class.
+ */
+class ForwardingFlowMultiplexerTest {
+    /**
+     * Test a trace workload.
+     */
+    @Test
+    fun testTrace() = runSimulation {
+        val engine = FlowEngine.create(coroutineContext, clock)
+        val graph = engine.newGraph()
+
+        val switch = ForwardingFlowMultiplexer(graph)
+        val sink = SimpleFlowSink(graph, 3200.0f)
+        graph.connect(switch.newOutput(), sink.input)
+
+        val workload =
+            TraceFlowSource(
+                graph,
+                TraceFlowSource.Trace(
+                    longArrayOf(1000, 2000, 3000, 4000),
+                    floatArrayOf(28.0f, 3500.0f, 0.0f, 183.0f),
+                    4
+                )
+            )
+        graph.connect(workload.output, switch.newInput())
+
+        advanceUntilIdle()
+
+        assertAll(
+            { assertEquals(4000, clock.millis()) { "Took enough time" } }
+        )
+    }
+}