samples: updates lci samples (#1266)

Updates the LCI samples to be accordingly to the spec. Instead of
printing out the processing units directly from the instance that is
created, another getInstance is done in order to retrieve the
information.

Author: thiagotnunes

samples/snippets/src/main/java/com/example/spanner/CreateInstanceWithProcessingUnitsExample.java

@@ -17,6 +17,7 @@
 package com.example.spanner;
 
 //[START spanner_create_instance_with_processing_units]
+
 import com.google.api.gax.longrunning.OperationFuture;
 import com.google.cloud.spanner.Instance;
 import com.google.cloud.spanner.InstanceAdminClient;
@@ -26,7 +27,6 @@
 import com.google.cloud.spanner.Spanner;
 import com.google.cloud.spanner.SpannerOptions;
 import com.google.spanner.admin.instance.v1.CreateInstanceMetadata;
-import java.util.concurrent.ExecutionException;
 
 class CreateInstanceWithProcessingUnitsExample {
 
@@ -47,26 +47,28 @@ static void createInstance(String projectId, String instanceId) {
     int processingUnits = 500;
     String displayName = "Descriptive name";
 
-    // Create an InstanceInfo object that will be used to create the instance.
-    InstanceInfo instanceInfo =
-        InstanceInfo.newBuilder(InstanceId.of(projectId, instanceId))
-            .setInstanceConfigId(InstanceConfigId.of(projectId, configId))
-            .setProcessingUnits(processingUnits)
-            .setDisplayName(displayName)
-            .build();
-    OperationFuture<Instance, CreateInstanceMetadata> operation =
-        instanceAdminClient.createInstance(instanceInfo);
     try {
+      // Creates a new instance
+      System.out.printf("Creating instance %s.%n", instanceId);
+      OperationFuture<Instance, CreateInstanceMetadata> operation =
+          instanceAdminClient.createInstance(InstanceInfo
+              .newBuilder(InstanceId.of(projectId, instanceId))
+              .setInstanceConfigId(InstanceConfigId.of(projectId, configId))
+              .setProcessingUnits(processingUnits)
+              .setDisplayName(displayName)
+              .build());
+
       // Wait for the createInstance operation to finish.
-      Instance instance = operation.get();
-      System.out.printf("Instance %s was successfully created with %d processing units%n",
-          instance.getId(), instance.getProcessingUnits());
-    } catch (ExecutionException e) {
-      System.out.printf(
-          "Error: Creating instance %s failed with error message %s%n",
-          instanceInfo.getId(), e.getMessage());
-    } catch (InterruptedException e) {
-      System.out.println("Error: Waiting for createInstance operation to finish was interrupted");
+      System.out.printf("Waiting for operation on %s to complete...%n", instanceId);
+      Instance createdInstance = operation.get();
+
+      System.out.printf("Created instance %s.%n", createdInstance.getId().getInstance());
+
+      Instance instance = instanceAdminClient.getInstance(instanceId);
+      System.out.printf("Instance %s has %d processing units.%n", instance.getId().getInstance(),
+          instance.getProcessingUnits());
+    } catch (Exception e) {
+      System.out.printf("Error: %s.%n", e.getMessage());
     }
     spanner.close();
   }