Use faster hash for unit testing

Author: russgold

operator/src/main/java/oracle/kubernetes/operator/helpers/AnnotationHelper.java

@@ -7,11 +7,14 @@
 import io.kubernetes.client.models.V1ObjectMeta;
 import io.kubernetes.client.models.V1Pod;
 import io.kubernetes.client.util.Yaml;
+import java.util.function.Function;
 import org.apache.commons.codec.digest.DigestUtils;
 
 /** Annotates pods, services with details about the Domain instance and checks these annotations. */
 public class AnnotationHelper {
   static final String SHA256_ANNOTATION = "weblogic.sha256";
+  private static Function<V1Pod, String> HASH_FUNCTION =
+      pod -> DigestUtils.sha256Hex(Yaml.dump(pod));
 
   /**
    * Marks metadata with annotations that let Prometheus know how to retrieve metrics from the
@@ -29,14 +32,10 @@ static void annotateForPrometheus(V1ObjectMeta meta, int httpPort) {
   }
 
   static V1Pod withSha256Hash(V1Pod pod) {
-    pod.getMetadata().putAnnotationsItem(SHA256_ANNOTATION, computeHash(pod));
+    pod.getMetadata().putAnnotationsItem(SHA256_ANNOTATION, HASH_FUNCTION.apply(pod));
     return pod;
   }
 
-  static String computeHash(V1Pod pod) {
-    return DigestUtils.sha256Hex(Yaml.dump(pod));
-  }
-
   static String getHash(V1Pod pod) {
     return pod.getMetadata().getAnnotations().get(SHA256_ANNOTATION);
   }

operator/src/test/java/oracle/kubernetes/operator/helpers/PodHelperTestBase.java

@@ -65,6 +65,7 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.function.Function;
 import java.util.logging.Level;
 import java.util.logging.LogRecord;
 import oracle.kubernetes.TestUtils;
@@ -160,6 +161,8 @@ public void setUp() throws Exception {
             .withLogLevel(Level.FINE));
     mementos.add(testSupport.installRequestStepFactory());
     mementos.add(TuningParametersStub.install());
+    mementos.add(
+        StaticStubSupport.install(AnnotationHelper.class, "HASH_FUNCTION", new UnitTestHash()));
 
     WlsDomainConfigSupport configSupport = new WlsDomainConfigSupport(DOMAIN_NAME);
     configSupport.addWlsServer(ADMIN_SERVER, ADMIN_PORT);
@@ -1109,4 +1112,11 @@ public boolean matches(Object actualBody) {
       return actualInstructions.equals(expectedInstructions);
     }
   }
+
+  static class UnitTestHash implements Function<V1Pod, String> {
+    @Override
+    public String apply(V1Pod v1Pod) {
+      return Integer.toString(v1Pod.hashCode());
+    }
+  }
 }