fix: for perf improvement using fast random (#49)

* fix: for perf improvemet using fast random

* fix spotless issues

* addressed the latest comments

* need to extend supress warning for jackson lib

* addressed the comments

* pushing refactored code

Author: kotharironak

grpc-context-utils/src/main/java/org/hypertrace/core/grpcutils/context/FastUUIDGenerator.java

@@ -0,0 +1,25 @@
+package org.hypertrace.core.grpcutils.context;
+
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class FastUUIDGenerator {
+  /**
+   * This function generates UUIDs using ThreadLocalRandom, which is faster and doesn't block like
+   * the default randomUUID method that relies on /dev/random. It's suitable for most random UUID
+   * needs.
+   */
+  public static UUID randomUUID() {
+    long mostSigBits = ThreadLocalRandom.current().nextLong();
+    long leastSigBits = ThreadLocalRandom.current().nextLong();
+
+    // Set the version (4) For random UUID
+    mostSigBits &= 0xFFFFFFFFFFFF0FFFL;
+    mostSigBits |= 0x0000000000004000L;
+    // Set variant to RFC 4122
+    leastSigBits &= 0x3FFFFFFFFFFFFFFFL;
+    leastSigBits |= 0x8000000000000000L;
+
+    return new UUID(mostSigBits, leastSigBits);
+  }
+}

grpc-context-utils/src/main/java/org/hypertrace/core/grpcutils/context/RequestContext.java

@@ -18,7 +18,6 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
-import java.util.UUID;
 import java.util.concurrent.Callable;
 import java.util.stream.Collectors;
 import javax.annotation.Nonnull;
@@ -34,7 +33,9 @@ public class RequestContext {
   public static RequestContext forTenantId(String tenantId) {
     return new RequestContext()
         .put(RequestContextConstants.TENANT_ID_HEADER_KEY, tenantId)
-        .put(RequestContextConstants.REQUEST_ID_HEADER_KEY, UUID.randomUUID().toString());
+        .put(
+            RequestContextConstants.REQUEST_ID_HEADER_KEY,
+            FastUUIDGenerator.randomUUID().toString());
   }
 
   public static RequestContext fromMetadata(Metadata metadata) {

owasp-suppressions.xml

@@ -7,7 +7,7 @@
         <packageUrl regex="true">^pkg:maven/org\.hypertrace\..*@.*$</packageUrl>
         <cpe>cpe:/a:grpc:grpc</cpe>
     </suppress>
-    <suppress until="2023-08-31Z">
+    <suppress until="2023-09-30Z">
         <notes><![CDATA[
   file name: jackson-databind-2.14.2.jar
   This is currently disputed.