fix: Add the ability to set UUID in AssignerSettings (#1296)

* fix: Add the ability to set UUID in AssignerSettings

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: dpcollins-google

README.md

@@ -32,13 +32,13 @@ If you are using Maven, add this to your pom.xml file:
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-pubsublite:1.9.1'
+implementation 'com.google.cloud:google-cloud-pubsublite:1.9.2'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-pubsublite" % "1.9.1"
+libraryDependencies += "com.google.cloud" % "google-cloud-pubsublite" % "1.9.2"
 ```
 
 ## Authentication

google-cloud-pubsublite/src/main/java/com/google/cloud/pubsublite/internal/wire/AssignerSettings.java

@@ -35,8 +35,11 @@ public abstract class AssignerSettings {
 
   abstract PartitionAssignmentServiceClient serviceClient();
 
+  // Optional parameters.
+  abstract UUID uuid();
+
   public static Builder newBuilder() {
-    return new AutoValue_AssignerSettings.Builder();
+    return new AutoValue_AssignerSettings.Builder().setUuid(UUID.randomUUID());
   }
 
   @AutoValue.Builder
@@ -48,15 +51,18 @@ public abstract static class Builder {
 
     public abstract Builder setServiceClient(PartitionAssignmentServiceClient serviceClient);
 
+    // Optional parameters.
+    public abstract Builder setUuid(UUID uuid);
+
     public abstract AssignerSettings build();
   }
 
   public Assigner instantiate() {
-    UUID uuid = UUID.randomUUID();
     ByteBuffer uuidBuffer = ByteBuffer.allocate(16);
-    uuidBuffer.putLong(uuid.getMostSignificantBits());
-    uuidBuffer.putLong(uuid.getLeastSignificantBits());
-    logger.atInfo().log("Subscription %s using UUID %s for assignment.", subscriptionPath(), uuid);
+    uuidBuffer.putLong(uuid().getMostSignificantBits());
+    uuidBuffer.putLong(uuid().getLeastSignificantBits());
+    logger.atInfo().log(
+        "Subscription %s using UUID %s for assignment.", subscriptionPath(), uuid());
 
     InitialPartitionAssignmentRequest initial =
         InitialPartitionAssignmentRequest.newBuilder()