Add the ability to migrate to new KBS enclaves.

app/src/main/java/org/thoughtcrime/securesms/migrations/KbsEnclaveMigrationJob.java

@@ -0,0 +1,53 @@
+package org.thoughtcrime.securesms.migrations;
+
+import androidx.annotation.NonNull;
+
+import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
+import org.thoughtcrime.securesms.jobmanager.Data;
+import org.thoughtcrime.securesms.jobmanager.Job;
+import org.thoughtcrime.securesms.jobs.KbsEnclaveMigrationWorkerJob;
+
+/**
+ * A job to be run whenever we add a new KBS enclave. In order to prevent this moderately-expensive
+ * task from blocking the network for too long, this task simply enqueues another non-migration job,
+ * {@link KbsEnclaveMigrationWorkerJob}, to do the heavy lifting.
+ */
+public class KbsEnclaveMigrationJob extends MigrationJob {
+
+  public static final String KEY = "KbsEnclaveMigrationJob";
+
+  KbsEnclaveMigrationJob() {
+    this(new Parameters.Builder().build());
+  }
+
+  private KbsEnclaveMigrationJob(@NonNull Parameters parameters) {
+    super(parameters);
+  }
+
+  @Override
+  public boolean isUiBlocking() {
+    return false;
+  }
+
+  @Override
+  public @NonNull String getFactoryKey() {
+    return KEY;
+  }
+
+  @Override
+  public void performMigration() {
+    ApplicationDependencies.getJobManager().add(new KbsEnclaveMigrationWorkerJob());
+  }
+
+  @Override
+  boolean shouldRetry(@NonNull Exception e) {
+    return false;
+  }
+
+  public static class Factory implements Job.Factory<KbsEnclaveMigrationJob> {
+    @Override
+    public @NonNull KbsEnclaveMigrationJob create(@NonNull Parameters parameters, @NonNull Data data) {
+      return new KbsEnclaveMigrationJob(parameters);
+    }
+  }
+}