Optimise HttpContentCodec#lookup

zio-http/shared/src/main/scala-2/zio/http/syntax.scala

@@ -0,0 +1,12 @@
+package zio.http
+
+/**
+ * Copied from: https://github.com/ghostdogpr/caliban/pull/2366
+ */
+private[http] object syntax {
+  val NullFn: () => AnyRef = () => null
+
+  implicit final class EnrichedImmutableMapOps[K, V <: AnyRef](private val self: Map[K, V]) extends AnyVal {
+    def getOrElseNull(key: K): V = self.getOrElse(key, NullFn()).asInstanceOf[V]
+  }
+}

zio-http/shared/src/main/scala-3/zio/http/syntax.scala

@@ -0,0 +1,17 @@
+package zio.http
+
+import scala.annotation.static
+
+/**
+ * Copied from: https://github.com/ghostdogpr/caliban/pull/2366
+ */
+private[http] object syntax {
+  @static val NullFn: () => AnyRef = () => null
+
+  extension [K, V <: AnyRef](inline map: Map[K, V]) {
+    transparent inline def getOrElseNull(key: K): V = map.getOrElse(key, NullFn()).asInstanceOf[V]
+  }
+}
+
+// Required for @static fields
+private final class syntax private

zio-http/shared/src/main/scala/zio/http/codec/HttpContentCodec.scala

@@ -1,6 +1,6 @@
 package zio.http.codec
 
-import scala.collection.immutable.ListMap
+import scala.collection.immutable.{HashMap, ListMap}
 
 import zio._
 
@@ -139,9 +139,11 @@ final case class HttpContentCodec[A](
     }
 
   def lookup(mediaType: MediaType): Option[BinaryCodecWithSchema[A]] = {
-    if (lookupCache.contains(mediaType)) {
-      lookupCache(mediaType)
-    } else {
+    import zio.http.syntax._
+
+    val codec = lookupCache.getOrElseNull(mediaType)
+    if (codec ne null) codec
+    else {
       val codec = choices.collectFirst { case (mt, codec) if mt.matches(mediaType) => codec }
       lookupCache = lookupCache + (mediaType -> codec)
       codec