Created new grpc wrapper

Author: surbhigarg92

google-cloud-spanner/src/main/java/com/google/cloud/spanner/BuiltInMetricsConstant.java

@@ -101,7 +101,6 @@ public class BuiltInMetricsConstant {
           DIRECT_PATH_ENABLED_KEY,
           DIRECT_PATH_USED_KEY);
 
-  public static boolean DIRECT_PATH_ENABLED;
   static Aggregation AGGREGATION_WITH_MILLIS_HISTOGRAM =
       Aggregation.explicitBucketHistogram(
           ImmutableList.of(

google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java

@@ -64,7 +64,6 @@
 import com.google.cloud.grpc.GrpcTransportOptions;
 import com.google.cloud.spanner.AdminRequestsPerMinuteExceededException;
 import com.google.cloud.spanner.BackupId;
-import com.google.cloud.spanner.BuiltInMetricsConstant;
 import com.google.cloud.spanner.ErrorCode;
 import com.google.cloud.spanner.Restore;
 import com.google.cloud.spanner.SpannerException;
@@ -87,6 +86,8 @@
 import com.google.common.base.Function;
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.io.Resources;
@@ -278,6 +279,11 @@ public class GapicSpannerRpc implements SpannerRpc {
   private final int numChannels;
   private final boolean isGrpcGcpExtensionEnabled;
 
+  private Supplier<Boolean> directPathEnabledSupplier =
+      () -> {
+        return false;
+      };;
+
   public static GapicSpannerRpc create(SpannerOptions options) {
     return new GapicSpannerRpc(options);
   }
@@ -353,7 +359,9 @@ public GapicSpannerRpc(final SpannerOptions options) {
                   SpannerInterceptorProvider.create(
                           MoreObjects.firstNonNull(
                               options.getInterceptorProvider(),
-                              SpannerInterceptorProvider.createDefault(options.getOpenTelemetry())))
+                              SpannerInterceptorProvider.createDefault(
+                                  options.getOpenTelemetry(),
+                                  (() -> directPathEnabledSupplier.get()))))
                       // This sets the trace context headers.
                       .withTraceContext(endToEndTracingEnabled, options.getOpenTelemetry())
                       // This sets the response compressor (Server -> Client).
@@ -411,9 +419,12 @@ public GapicSpannerRpc(final SpannerOptions options) {
                 .build();
         ClientContext clientContext = ClientContext.create(spannerStubSettings);
         this.spannerStub = GrpcSpannerStubWrapper.create(spannerStubSettings, clientContext);
-        BuiltInMetricsConstant.DIRECT_PATH_ENABLED =
-            ((GrpcTransportChannel) clientContext.getTransportChannel()).isDirectPath()
-                && isAttemptDirectPathXds;
+        this.directPathEnabledSupplier =
+            Suppliers.memoize(
+                () -> {
+                  return ((GrpcTransportChannel) clientContext.getTransportChannel()).isDirectPath()
+                      && isAttemptDirectPathXds;
+                });
         this.readRetrySettings =
             options.getSpannerStubSettings().streamingReadSettings().getRetrySettings();
         this.readRetryableCodes =

google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/HeaderInterceptor.java

@@ -28,6 +28,7 @@
 import com.google.cloud.spanner.CompositeTracer;
 import com.google.cloud.spanner.SpannerExceptionFactory;
 import com.google.cloud.spanner.SpannerRpcMetrics;
+import com.google.common.base.Supplier;
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheBuilder;
 import com.google.spanner.admin.database.v1.DatabaseName;
@@ -93,8 +94,12 @@ class HeaderInterceptor implements ClientInterceptor {
   private static final Level LEVEL = Level.INFO;
   private final SpannerRpcMetrics spannerRpcMetrics;
 
-  HeaderInterceptor(SpannerRpcMetrics spannerRpcMetrics) {
+  private final Supplier<Boolean> directPathEnabledSupplier;
+
+  HeaderInterceptor(
+      SpannerRpcMetrics spannerRpcMetrics, Supplier<Boolean> directPathEnabledSupplier) {
     this.spannerRpcMetrics = spannerRpcMetrics;
+    this.directPathEnabledSupplier = directPathEnabledSupplier;
   }
 
   @Override
@@ -230,7 +235,7 @@ private Map<String, String> getBuiltInMetricAttributes(String key, DatabaseName
               BuiltInMetricsConstant.INSTANCE_ID_KEY.getKey(), databaseName.getInstance());
           attributes.put(
               BuiltInMetricsConstant.DIRECT_PATH_ENABLED_KEY.getKey(),
-              String.valueOf(BuiltInMetricsConstant.DIRECT_PATH_ENABLED));
+              String.valueOf(this.directPathEnabledSupplier.get()));
           return attributes;
         });
   }

google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/SpannerInterceptorProvider.java

@@ -19,6 +19,8 @@
 import com.google.api.core.ObsoleteApi;
 import com.google.api.gax.grpc.GrpcInterceptorProvider;
 import com.google.cloud.spanner.SpannerRpcMetrics;
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
 import com.google.common.collect.ImmutableList;
 import io.grpc.ClientInterceptor;
 import io.opentelemetry.api.GlobalOpenTelemetry;
@@ -46,11 +48,22 @@ public static SpannerInterceptorProvider createDefault() {
   }
 
   public static SpannerInterceptorProvider createDefault(OpenTelemetry openTelemetry) {
+    return createDefault(
+        openTelemetry,
+        Suppliers.memoize(
+            () -> {
+              return false;
+            }));
+  }
+
+  public static SpannerInterceptorProvider createDefault(
+      OpenTelemetry openTelemetry, Supplier<Boolean> directPathEnabledSupplier) {
     List<ClientInterceptor> defaultInterceptorList = new ArrayList<>();
     defaultInterceptorList.add(new SpannerErrorInterceptor());
     defaultInterceptorList.add(
         new LoggingInterceptor(Logger.getLogger(GapicSpannerRpc.class.getName()), Level.FINER));
-    defaultInterceptorList.add(new HeaderInterceptor(new SpannerRpcMetrics(openTelemetry)));
+    defaultInterceptorList.add(
+        new HeaderInterceptor(new SpannerRpcMetrics(openTelemetry), directPathEnabledSupplier));
     return new SpannerInterceptorProvider(ImmutableList.copyOf(defaultInterceptorList));
   }