Switch from Guava Optionals to Java 8 Optionals

This was a surprisingly involved change. Some of the difficulties included
java.util.Optional purposely not being Serializable (so I had to move a
few Optionals in mapreduce classes to @Nullable) and having to add the Truth
Java8 extension library for assertion support.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171863777

javatests/google/registry/monitoring/metrics/BUILD

@@ -12,8 +12,9 @@ java_library(
     srcs = glob(["*.java"]),
     deps = [
         "//java/google/registry/monitoring/metrics",
-        "//third_party/java/truth",
         "@com_google_guava",
+        "@com_google_truth",
+        "@com_google_truth_extensions_truth_java8_extension",
         "@joda_time",
         "@junit",
         "@org_mockito_all",

javatests/google/registry/monitoring/metrics/CounterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;

javatests/google/registry/monitoring/metrics/CustomFitterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.ImmutableSortedSet;

javatests/google/registry/monitoring/metrics/EventMetricTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableRangeMap;

javatests/google/registry/monitoring/metrics/ExponentialFitterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import org.junit.Rule;
 import org.junit.Test;

javatests/google/registry/monitoring/metrics/FibonacciFitterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.junit.Assert.fail;
 
 import com.google.common.collect.ImmutableList;

javatests/google/registry/monitoring/metrics/LinearFitterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import org.junit.Rule;
 import org.junit.Test;

javatests/google/registry/monitoring/metrics/MetricExporterTest.java

@@ -15,15 +15,16 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.Mockito.doThrow;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.util.concurrent.Service.State;
 import java.io.IOException;
+import java.util.Optional;
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.Executors;
@@ -44,7 +45,7 @@ public class MetricExporterTest {
   @Mock private MetricPoint<?> point;
   private MetricExporter exporter;
   private BlockingQueue<Optional<ImmutableList<MetricPoint<?>>>> writeQueue;
-  private final Optional<ImmutableList<MetricPoint<?>>> poisonPill = Optional.absent();
+  private final Optional<ImmutableList<MetricPoint<?>>> poisonPill = Optional.empty();
   private final Optional<ImmutableList<MetricPoint<?>>> emptyBatch =
       Optional.of(ImmutableList.<MetricPoint<?>>of());
 

javatests/google/registry/monitoring/metrics/MetricRegistryImplTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static org.mockito.Mockito.mock;
 
 import com.google.common.collect.ImmutableList;

javatests/google/registry/monitoring/metrics/MetricReporterTest.java

@@ -18,9 +18,9 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
-import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
+import java.util.Optional;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ThreadFactory;
 import org.junit.Test;
@@ -65,6 +65,6 @@ public class MetricReporterTest {
     verify(reporter).runOneIteration();
     InOrder interactions = Mockito.inOrder(writeQueue);
     interactions.verify(writeQueue).offer(Optional.of(ImmutableList.<MetricPoint<?>>of()));
-    interactions.verify(writeQueue).offer(Optional.<ImmutableList<MetricPoint<?>>>absent());
+    interactions.verify(writeQueue).offer(Optional.<ImmutableList<MetricPoint<?>>>empty());
   }
 }

javatests/google/registry/monitoring/metrics/MutableDistributionTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.collect.ImmutableRangeMap;
 import com.google.common.collect.ImmutableSet;

javatests/google/registry/monitoring/metrics/StoredMetricTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;

javatests/google/registry/monitoring/metrics/VirtualMetricTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.google.common.base.Suppliers;
 import com.google.common.collect.ImmutableList;

javatests/google/registry/monitoring/metrics/contrib/BUILD

@@ -13,8 +13,9 @@ java_library(
     deps = [
         "//java/google/registry/monitoring/metrics",
         "//java/google/registry/monitoring/metrics/contrib",
-        "//third_party/java/truth",
         "@com_google_guava",
+        "@com_google_truth",
+        "@com_google_truth_extensions_truth_java8_extension",
         "@junit",
     ],
 )

javatests/google/registry/monitoring/metrics/contrib/DistributionMetricSubjectTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics.contrib;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.monitoring.metrics.contrib.DistributionMetricSubject.assertThat;
 import static org.junit.Assert.fail;
 

javatests/google/registry/monitoring/metrics/contrib/LongMetricSubjectTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics.contrib;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static google.registry.monitoring.metrics.contrib.LongMetricSubject.assertThat;
 import static org.junit.Assert.fail;
 

javatests/google/registry/monitoring/metrics/stackdriver/BUILD

@@ -13,12 +13,13 @@ java_library(
     deps = [
         "//java/google/registry/monitoring/metrics",
         "//java/google/registry/monitoring/metrics/stackdriver",
-        "//third_party/java/truth",
         "@com_google_api_client",
         "@com_google_apis_google_api_services_monitoring",
         "@com_google_guava",
         "@com_google_http_client",
         "@com_google_http_client_jackson2",
+        "@com_google_truth",
+        "@com_google_truth_extensions_truth_java8_extension",
         "@joda_time",
         "@junit",
         "@org_mockito_all",

javatests/google/registry/monitoring/metrics/stackdriver/StackdriverWriterTest.java

@@ -15,6 +15,7 @@
 package google.registry.monitoring.metrics.stackdriver;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.fail;
 import static org.mockito.Matchers.any;