refactor(compute/service): Do not suspend on guest start

This change updates the `Host` interface to remove the suspend modifiers
to the start, stop, spawn, and delete methods of this interface. We now
assume that the host immediately launches the guest on invocation of
this method.

1 files changed, 20 insertions, 17 deletions

diff --git a/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/SimHostTest.kt b/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/SimHostTest.kt
index 27151422..fc581d3e 100644
--- a/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/SimHostTest.kt
+++ b/opendc-compute/opendc-compute-simulator/src/test/kotlin/org/opendc/compute/simulator/SimHostTest.kt
@@ -24,7 +24,6 @@ package org.opendc.compute.simulator
 
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.suspendCancellableCoroutine
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.BeforeEach
@@ -107,20 +106,19 @@ internal class SimHostTest {
 
         val flavor = MockFlavor(2, 0)
 
-        coroutineScope {
-            launch { host.spawn(MockServer(UUID.randomUUID(), "a", flavor, vmImage)) }
+        suspendCancellableCoroutine { cont ->
+            host.addListener(object : HostListener {
+                private var finished = 0
 
-            suspendCancellableCoroutine { cont ->
-                host.addListener(object : HostListener {
-                    private var finished = 0
-
-                    override fun onStateChanged(host: Host, server: Server, newState: ServerState) {
-                        if (newState == ServerState.TERMINATED && ++finished == 1) {
-                            cont.resume(Unit)
-                        }
+                override fun onStateChanged(host: Host, server: Server, newState: ServerState) {
+                    if (newState == ServerState.TERMINATED && ++finished == 1) {
+                        cont.resume(Unit)
                     }
-                })
-            }
+                }
+            })
+            val server = MockServer(UUID.randomUUID(), "a", flavor, vmImage)
+            host.spawn(server)
+            host.start(server)
         }
 
         // Ensure last cycle is collected
@@ -190,9 +188,6 @@ internal class SimHostTest {
         val flavor = MockFlavor(2, 0)
 
         coroutineScope {
-            launch { host.spawn(MockServer(UUID.randomUUID(), "a", flavor, vmImageA)) }
-            launch { host.spawn(MockServer(UUID.randomUUID(), "b", flavor, vmImageB)) }
-
             suspendCancellableCoroutine { cont ->
                 host.addListener(object : HostListener {
                     private var finished = 0
@@ -203,6 +198,13 @@ internal class SimHostTest {
                         }
                     }
                 })
+                val serverA = MockServer(UUID.randomUUID(), "a", flavor, vmImageA)
+                host.spawn(serverA)
+                val serverB = MockServer(UUID.randomUUID(), "b", flavor, vmImageB)
+                host.spawn(serverB)
+
+                host.start(serverA)
+                host.start(serverB)
             }
         }
 
@@ -259,12 +261,13 @@ internal class SimHostTest {
 
         coroutineScope {
             host.spawn(server)
+            host.start(server)
             delay(5000L)
             host.fail()
             delay(duration * 1000)
             host.recover()
 
-            suspendCancellableCoroutine<Unit> { cont ->
+            suspendCancellableCoroutine { cont ->
                 host.addListener(object : HostListener {
                     override fun onStateChanged(host: Host, server: Server, newState: ServerState) {
                         if (newState == ServerState.TERMINATED) {