Clients/Java: Add a multi-task sample that runs two jobs at the same time.

Clients/Java/sample/build.gradle.kts

@@ -13,6 +13,8 @@ dependencies {
   implementation("org.jetbrains.kotlin:kotlin-bom")
   implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
 
+  implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.0-RC")
+
   implementation(rootProject)
 }
 
@@ -24,4 +26,4 @@ java {
 
 application {
   mainClass.set("gay.pizza.stable.diffusion.sample.MainKt")
-}
+}

Clients/Java/sample/src/main/kotlin/gay/pizza/stable/diffusion/sample/main.kt

@@ -4,10 +4,12 @@ import com.google.protobuf.ByteString
 import gay.pizza.stable.diffusion.StableDiffusion.*
 import gay.pizza.stable.diffusion.StableDiffusionRpcClient
 import io.grpc.ManagedChannelBuilder
-import kotlin.io.path.Path
-import kotlin.io.path.exists
-import kotlin.io.path.readBytes
-import kotlin.io.path.writeBytes
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.runBlocking
+import java.nio.file.Path
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.io.path.*
 import kotlin.system.exitProcess
 
 fun main(args: Array<String>) {
@@ -87,30 +89,58 @@ fun main(args: Array<String>) {
       startingImage = image
     }
   }.build()
-  for ((updateIndex, update) in client.imageGenerationServiceBlocking.generateImagesStreaming(request).withIndex()) {
+
+  val workingDirectory = Path("work")
+  if (!workingDirectory.exists()) {
+    workingDirectory.createDirectories()
+  }
+
+  runBlocking {
+    val task1 = async {
+      performImageGeneration(1, client, request, workingDirectory.resolve("task1"))
+    }
+
+    val task2 = async {
+      performImageGeneration(2, client, request, workingDirectory.resolve("task2"))
+    }
+
+    awaitAll(task1, task2)
+  }
+
+  channel.shutdownNow()
+}
+
+@OptIn(ExperimentalPathApi::class)
+suspend fun performImageGeneration(task: Int, client: StableDiffusionRpcClient, request: GenerateImagesRequest, path: Path) {
+  val updateIndex = AtomicInteger(0)
+  if (path.exists()) {
+    path.deleteRecursively()
+  }
+  path.createDirectories()
+
+  client.imageGenerationServiceCoroutine.generateImagesStreaming(request).collect { update ->
+    updateIndex.incrementAndGet()
     if (update.hasBatchProgress()) {
-      println("batch=${update.currentBatch} " +
+      println("task=$task batch=${update.currentBatch} " +
         "progress=${prettyProgressValue(update.batchProgress.percentageComplete)}% " +
         "overall=${prettyProgressValue(update.overallPercentageComplete)}%")
       for ((index, image) in update.batchProgress.imagesList.withIndex()) {
         val imageIndex = ((update.currentBatch - 1) * request.batchSize) + (index + 1)
-        println("image=$imageIndex update=$updateIndex format=${image.format.name} data=(${image.data.size()} bytes)")
-        val path = Path("work/intermediate_${imageIndex}_${updateIndex}.${image.format.name}")
-        path.writeBytes(image.data.toByteArray())
+        println("task=$task image=$imageIndex update=$updateIndex format=${image.format.name} data=(${image.data.size()} bytes)")
+        val filePath = path.resolve("intermediate_${imageIndex}_${updateIndex}.${image.format.name}")
+        filePath.writeBytes(image.data.toByteArray())
       }
     }
 
     if (update.hasBatchCompleted()) {
       for ((index, image) in update.batchCompleted.imagesList.withIndex()) {
         val imageIndex = ((update.currentBatch - 1) * request.batchSize) + (index + 1)
-        println("image=$imageIndex format=${image.format.name} data=(${image.data.size()} bytes)")
-        val path = Path("work/final_${imageIndex}.${image.format.name}")
-        path.writeBytes(image.data.toByteArray())
+        println("task=$task image=$imageIndex format=${image.format.name} data=(${image.data.size()} bytes)")
+        val filePath = path.resolve("final_${imageIndex}.${image.format.name}")
+        filePath.writeBytes(image.data.toByteArray())
       }
     }
   }
-
-  channel.shutdownNow()
 }
 
 fun prettyProgressValue(value: Float) = String.format("%.2f", value)

Common/StableDiffusion.proto

@@ -333,6 +333,9 @@ message GenerateImagesStreamUpdate {
         GenerateImagesBatchCompletedUpdate batch_completed = 3;
     }
 
+    /**
+     * The percentage of completion for the entire submitted job.
+     */
     float overall_percentage_complete = 4;
 }