define hashcode as lazy val

Author: c0d33ngr

benchmarks/src/main/scala/org/typelevel/otel4s/benchmarks/AttributesBenchmark.scala

@@ -35,7 +35,7 @@ class AttributesBenchmark {
 
   @Benchmark
   def java_computeHashCode(): Unit = {
-    for (a <- jAttributes) { a.hashCode() }
+    for (a <- jAttributes) { a.hashCode }
   }
 
   @Benchmark
@@ -69,7 +69,7 @@ class AttributesBenchmark {
   @Benchmark
   def otel4s_computeHashCode(): Unit = {
     for (a <- attributes) {
-      a.hashCode()
+      a.hashCode
     }
   }
 

core/common/src/main/scala/org/typelevel/otel4s/AnyValue.scala

@@ -133,8 +133,8 @@ object AnyValue {
       case LongValueImpl(value)      => Hash[Long].hash(value)
       case DoubleValueImpl(value)    => Hash[Double].hash(value)
       case ByteArrayValueImpl(value) => java.util.Arrays.hashCode(value)
-      case ListValueImpl(values)     => values.map(hash).hashCode()
-      case MapValueImpl(values)      => values.map { case (k, v) => (k, hash(v)) }.hashCode()
+      case ListValueImpl(values)     => values.map(hash).hashCode
+      case MapValueImpl(values)      => values.map { case (k, v) => (k, hash(v)) }.hashCode
       case _: EmptyValue             => System.identityHashCode(EmptyValueImpl)
     }
 

core/common/src/main/scala/org/typelevel/otel4s/Attribute.scala

@@ -19,6 +19,7 @@ package org.typelevel.otel4s
 import cats.Hash
 import cats.Show
 import cats.syntax.show._
+import org.typelevel.scalaccompat.annotation.threadUnsafe3
 
 /** Represents the key-value attribute.
   *
@@ -38,7 +39,8 @@ sealed trait Attribute[A] {
     */
   def value: A
 
-  override final def hashCode(): Int =
+  @threadUnsafe3
+  override final lazy val hashCode: Int =
     Hash[Attribute[_]].hash(this)
 
   override final def equals(obj: Any): Boolean =

core/common/src/main/scala/org/typelevel/otel4s/AttributeKey.scala

@@ -19,6 +19,7 @@ package org.typelevel.otel4s
 import cats.Hash
 import cats.Show
 import cats.syntax.show._
+import org.typelevel.scalaccompat.annotation.threadUnsafe3
 
 /** The type of value that can be set with an implementation of this key is denoted by the type parameter.
   *
@@ -97,7 +98,8 @@ object AttributeKey {
     override final def toString: String =
       Show[AttributeKey[A]].show(this)
 
-    override final def hashCode(): Int =
+    @threadUnsafe3
+    override final lazy val hashCode: Int =
       Hash[AttributeKey[A]].hash(this)
 
     override final def equals(obj: Any): Boolean =

core/common/src/main/scala/org/typelevel/otel4s/Attributes.scala

@@ -21,6 +21,7 @@ import cats.Monoid
 import cats.Show
 import cats.syntax.show._
 import org.typelevel.otel4s.AttributeKey.KeySelect
+import org.typelevel.scalaccompat.annotation.threadUnsafe3
 
 import scala.collection.IterableOps
 import scala.collection.SpecificIterableFactory
@@ -105,7 +106,8 @@ sealed trait Attributes
     attributesFactory.newBuilder
   override protected[this] def className: String = "Attributes"
 
-  override def hashCode(): Int =
+  @threadUnsafe3
+  override lazy val hashCode: Int =
     Hash[Attributes].hash(this)
 
   override def equals(obj: Any): Boolean =

core/common/src/main/scala/org/typelevel/otel4s/baggage/Baggage.scala

@@ -91,7 +91,7 @@ sealed trait Baggage {
   /** Returns a map representation of this baggage. */
   def asMap: Map[String, Baggage.Entry]
 
-  override final def hashCode(): Int =
+  override final lazy val hashCode: Int =
     Hash[Baggage].hash(this)
 
   override final def equals(obj: Any): Boolean =
@@ -114,7 +114,7 @@ object Baggage {
   sealed trait Metadata {
     def value: String
 
-    override final def hashCode(): Int =
+    override final lazy val hashCode: Int =
       Hash[Metadata].hash(this)
 
     override final def equals(obj: Any): Boolean =
@@ -149,7 +149,7 @@ object Baggage {
       */
     def metadata: Option[Metadata]
 
-    override final def hashCode(): Int =
+    override final lazy val hashCode: Int =
       Hash[Entry].hash(this)
 
     override final def equals(obj: Any): Boolean =

core/logs/src/main/scala/org/typelevel/otel4s/logs/Severity.scala

@@ -33,7 +33,7 @@ import cats.Show
   */
 sealed abstract class Severity(val value: Int, val name: String) {
 
-  override final def hashCode(): Int =
+  override final lazy val hashCode: Int =
     Hash[Severity].hash(this)
 
   override final def equals(obj: Any): Boolean =

core/metrics/src/main/scala/org/typelevel/otel4s/metrics/BucketBoundaries.scala

@@ -26,7 +26,7 @@ sealed trait BucketBoundaries {
 
   final def length: Int = boundaries.length
 
-  override final def hashCode(): Int =
+  override final lazy val hashCode: Int =
     Hash[BucketBoundaries].hash(this)
 
   override final def equals(obj: Any): Boolean =

core/trace/src/main/scala/org/typelevel/otel4s/trace/SpanContext.scala

@@ -68,7 +68,7 @@ sealed trait SpanContext {
     */
   def isRemote: Boolean
 
-  override final def hashCode(): Int =
+  override final lazy val hashCode: Int =
     Hash[SpanContext].hash(this)
 
   override final def equals(obj: Any): Boolean =

core/trace/src/main/scala/org/typelevel/otel4s/trace/TraceFlags.scala

@@ -38,7 +38,7 @@ sealed trait TraceFlags {
     */
   def isSampled: Boolean
 
-  override final def hashCode(): Int =
+  override final lazy val hashCode: Int =
     Hash[TraceFlags].hash(this)
 
   override final def equals(obj: Any): Boolean =