feat: Add naming cache

README.md

@@ -120,13 +120,12 @@ Would normally have a schema like this:
 }
 ```
 
-However we can override the name and/or the namespace like this:
+#### Overriding the class name and the namespace
 
 ```kotlin
 package com.github.avrokotlin.avro4k.example
 
-@AvroName("Wibble")
-@AvroNamespace("com.other")
+@SerialName("com.other.Wibble")
 data class Foo(val a: String)
 ```
 
@@ -146,15 +145,67 @@ And then the generated schema looks like this:
 }
 ```
 
-Note: It is possible, but not necessary, to use both AvroName and AvroNamespace. You can just use either of them if you wish.
 
+#### Overriding only the namespace
 
+We can also just override the namespace while keeping the class name as record name:
 
+```kotlin
+package com.github.avrokotlin.avro4k.example
+
+@AvroNamespaceOverride("com.other")
+data class Foo(val a: String)
+```
+
+And then the generated schema looks like this:
+
+```json
+{
+  "type":"record",
+  "name":"Foo",
+  "namespace":"com.other",
+  "fields":[
+    {
+      "name":"a",
+      "type":"string"
+    }
+  ]
+}
+```
+
+
+
+#### Overriding only the name
+
+We can just override the name while keeping the namespace. Note that you need to replicate the namespace in the `@SerialName` annotation:
+
+```kotlin
+package com.github.avrokotlin.avro4k.example
+
+@SerialName("com.github.avrokotlin.avro4k.example.Wibble")
+data class Foo(val a: String)
+```
+
+And then the generated schema looks like this:
+
+```json
+{
+  "type":"record",
+  "name":"Wibble",
+  "namespace":"com.github.avrokotlin.avro4k.example",
+  "fields":[
+    {
+      "name":"a",
+      "type":"string"
+    }
+  ]
+}
+```
 
 
 ### Overriding a field name
 
-The `@AvroName` annotation can also be used to override field names. 
+The `@SerialName` annotation can also be used to override field names. 
 This is useful when the record instances you are generating or reading need to have field names different from the Kotlin data classes. 
 For example if you are reading data generated by another system or another language.
 
@@ -163,7 +214,7 @@ Given the following class.
 ```kotlin
 package com.github.avrokotlin.avro4k.example
 
-data class Foo(val a: String, @AvroName("z") val b : String)
+data class Foo(val a: String, @SerialName("z") val b : String)
 ```
 
 Then the generated schema would look like this:
@@ -188,12 +239,64 @@ Then the generated schema would look like this:
 
 Notice that the second field is z and not b.
 
-Note: `@AvroName` does not add an alternative name for the field, but an override.
+Note: `@SerialName` does not add an alternative name for the field, but an override.
 If you wish to have alternatives then you should use `@AvroAlias`.
 
 
+### Overriding the namespaces for all nested records, fixed and enums in a field
+
+```kotlin
+package com.github.avrokotlin.avro4k.example
 
+data class Foo(@AvroNamespaceOverride("overridden") val nested: Bar)
+data class Bar(val a: String)
+```
 
+Then the generated schema would look like this:
+
+```json
+{
+  "type":"record",
+  "name":"Foo",
+  "namespace":"com.github.avrokotlin.avro4k.example",
+  "fields":[
+    {
+      "name":"nested",
+      "type": {
+        "type":"record",
+        "name":"Bar",
+        "namespace":"overridden",
+        "fields":[
+          {
+            "name":"a",
+            "type":"string"
+          }
+        ]
+      }
+    }    
+  ]
+}
+```
+
+Notice that the second field is z and not b.
+
+Note: `@SerialName` does not add an alternative name for the field, but an override.
+If you wish to have alternatives then you should use `@AvroAlias`.
+
+
+
+### Change the record/enum/fixed naming strategy
+To change the naming strategy for records, enums and fixed types, create your own instance of `Avro` with the wanted naming strategies.
+
+- `fieldNamingStrategy` is used for field names.
+- `recordNamingStrategy` is used for record, enum and fixed names.
+
+```kotlin
+Avro(AvroConfiguration(
+    fieldNamingStrategy = /* ... */,
+    recordNamingStrategy = /* ... */,
+))
+```
 
 ### Adding properties and docs to a Schema
 
@@ -438,7 +541,6 @@ But if you want to remove a nullable field that is not optional, depending on th
 
 So to mark a field as optional and facilitate avro contract evolution regarding compatibility checks, then set `default` to `null`.
 
-
 ## Types
 
 Avro4k supports the Avro logical types out of the box as well as other common JDK types.

src/main/kotlin/com/github/avrokotlin/avro4k/Avro.kt

@@ -153,10 +153,15 @@ class AvroOutputStreamBuilder<T>(
 }
 
 @OptIn(ExperimentalSerializationApi::class)
-class Avro(
-    override val serializersModule: SerializersModule = defaultModule,
-    internal val configuration: AvroConfiguration = AvroConfiguration(),
+class Avro internal constructor(
+    internal val configuration: AvroInternalConfiguration,
+    override val serializersModule: SerializersModule,
 ) : SerialFormat, BinaryFormat {
+    constructor(
+        serializersModule: SerializersModule = defaultModule,
+        configuration: AvroConfiguration = AvroConfiguration(),
+    ) : this(AvroInternalConfiguration(configuration), serializersModule)
+
     constructor(configuration: AvroConfiguration) : this(defaultModule, configuration)
 
     companion object {

src/main/kotlin/com/github/avrokotlin/avro4k/AvroConfiguration.kt

@@ -1,7 +1,10 @@
 package com.github.avrokotlin.avro4k
 
 import com.github.avrokotlin.avro4k.schema.FieldNamingStrategy
+import com.github.avrokotlin.avro4k.schema.RecordName
 import com.github.avrokotlin.avro4k.schema.RecordNamingStrategy
+import kotlinx.serialization.descriptors.SerialDescriptor
+import java.util.concurrent.ConcurrentHashMap
 
 data class AvroConfiguration(
     val recordNamingStrategy: RecordNamingStrategy = RecordNamingStrategy.Default,
@@ -11,4 +14,44 @@ data class AvroConfiguration(
      * When set to [true], the nullable fields that haven't any default value are set as null if the value is missing. It also adds `"default": null` to those fields when generating schema using avro4k.
      */
     val implicitNulls: Boolean = false,
-)
+    val namingCacheEnabled: Boolean = true,
+)
+
+class AvroInternalConfiguration private constructor(
+    val recordNamingStrategy: RecordNamingStrategy,
+    val fieldNamingStrategy: FieldNamingStrategy,
+    val implicitNulls: Boolean,
+) {
+    constructor(configuration: AvroConfiguration) : this(
+        recordNamingStrategy = configuration.recordNamingStrategy.cachedIfNecessary(configuration.namingCacheEnabled),
+        fieldNamingStrategy = configuration.fieldNamingStrategy.cachedIfNecessary(configuration.namingCacheEnabled),
+        implicitNulls = configuration.implicitNulls
+    )
+}
+
+internal fun RecordNamingStrategy.cachedIfNecessary(cacheEnabled: Boolean): RecordNamingStrategy =
+    object : RecordNamingStrategy {
+        private val cache = ConcurrentHashMap<SerialDescriptor, RecordName>()
+
+        override fun resolve(
+            descriptor: SerialDescriptor,
+            serialName: String,
+        ): RecordName =
+            cache.getOrPut(descriptor) {
+                this@cachedIfNecessary.resolve(descriptor, serialName)
+            }
+    }
+
+internal fun FieldNamingStrategy.cachedIfNecessary(cacheEnabled: Boolean): FieldNamingStrategy =
+    object : FieldNamingStrategy {
+        private val cache = ConcurrentHashMap<Pair<SerialDescriptor, Int>, String>()
+
+        override fun resolve(
+            descriptor: SerialDescriptor,
+            elementIndex: Int,
+            serialName: String,
+        ): String =
+            cache.getOrPut(descriptor to elementIndex) {
+                this@cachedIfNecessary.resolve(descriptor, elementIndex, serialName)
+            }
+    }

src/main/kotlin/com/github/avrokotlin/avro4k/decoder/ListDecoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.decoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import kotlinx.serialization.DeserializationStrategy
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.descriptors.PolymorphicKind
@@ -19,7 +19,7 @@ class ListDecoder(
     private val schema: Schema,
     private val array: List<Any?>,
     override val serializersModule: SerializersModule,
-    private val configuration: AvroConfiguration,
+    private val configuration: AvroInternalConfiguration,
 ) : AbstractDecoder(), FieldDecoder {
     init {
         require(schema.type == Schema.Type.ARRAY)
@@ -85,7 +85,7 @@ class ListDecoder(
         return when (descriptor.kind) {
             StructureKind.CLASS -> RecordDecoder(descriptor, array[index] as GenericRecord, serializersModule, configuration)
             StructureKind.LIST -> ListDecoder(schema.elementType, array[index] as GenericArray<*>, serializersModule, configuration)
-            StructureKind.MAP -> MapDecoder(descriptor, schema.elementType, array[index] as Map<String, *>, serializersModule, configuration)
+            StructureKind.MAP -> MapDecoder(schema.elementType, array[index] as Map<String, *>, serializersModule, configuration)
             PolymorphicKind.SEALED, PolymorphicKind.OPEN -> UnionDecoder(descriptor, array[index] as GenericRecord, serializersModule, configuration)
             else -> throw UnsupportedOperationException("Kind ${descriptor.kind} is currently not supported.")
         }

src/main/kotlin/com/github/avrokotlin/avro4k/decoder/MapDecoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.decoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.descriptors.PolymorphicKind
@@ -17,11 +17,10 @@ import java.nio.ByteBuffer
 
 @ExperimentalSerializationApi
 class MapDecoder(
-    private val desc: SerialDescriptor,
     private val schema: Schema,
     map: Map<*, *>,
     override val serializersModule: SerializersModule,
-    private val configuration: AvroConfiguration,
+    private val configuration: AvroInternalConfiguration,
 ) : AbstractDecoder(), CompositeDecoder {
     init {
         require(schema.type == Schema.Type.MAP)
@@ -146,7 +145,7 @@ class MapDecoder(
                     PrimitiveKind.BYTE -> ByteArrayDecoder((value() as ByteBuffer).array(), serializersModule)
                     else -> ListDecoder(schema.valueType, value() as GenericArray<*>, serializersModule, configuration)
                 }
-            StructureKind.MAP -> MapDecoder(descriptor, schema.valueType, value() as Map<String, *>, serializersModule, configuration)
+            StructureKind.MAP -> MapDecoder(schema.valueType, value() as Map<String, *>, serializersModule, configuration)
             PolymorphicKind.SEALED, PolymorphicKind.OPEN -> UnionDecoder(descriptor, value() as GenericRecord, serializersModule, configuration)
             else -> throw UnsupportedOperationException("Kind ${descriptor.kind} is currently not supported.")
         }

src/main/kotlin/com/github/avrokotlin/avro4k/decoder/RecordDecoder.kt

@@ -1,7 +1,7 @@
 package com.github.avrokotlin.avro4k.decoder
 
 import com.github.avrokotlin.avro4k.AnnotationExtractor
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import com.github.avrokotlin.avro4k.schema.extractNonNull
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.SerializationException
@@ -31,7 +31,7 @@ class RecordDecoder(
     private val desc: SerialDescriptor,
     private val record: GenericRecord,
     override val serializersModule: SerializersModule,
-    private val configuration: AvroConfiguration,
+    private val configuration: AvroInternalConfiguration,
 ) : AbstractDecoder(), FieldDecoder {
     private var currentIndex = -1
 
@@ -42,7 +42,6 @@ class RecordDecoder(
             StructureKind.CLASS -> RecordDecoder(descriptor, value as GenericRecord, serializersModule, configuration)
             StructureKind.MAP ->
                 MapDecoder(
-                    descriptor,
                     fieldSchema(),
                     value as Map<String, *>,
                     serializersModule,

src/main/kotlin/com/github/avrokotlin/avro4k/decoder/RootRecordDecoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.decoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.descriptors.PolymorphicKind
@@ -16,7 +16,7 @@ import org.apache.avro.generic.GenericRecord
 class RootRecordDecoder(
     private val record: GenericRecord,
     override val serializersModule: SerializersModule,
-    private val configuration: AvroConfiguration,
+    private val configuration: AvroInternalConfiguration,
 ) : AbstractDecoder() {
     var decoded = false
 

src/main/kotlin/com/github/avrokotlin/avro4k/decoder/UnionDecoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.decoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import com.github.avrokotlin.avro4k.possibleSerializationSubclasses
 import com.github.avrokotlin.avro4k.schema.RecordName
 import kotlinx.serialization.DeserializationStrategy
@@ -18,7 +18,7 @@ class UnionDecoder(
     descriptor: SerialDescriptor,
     private val value: GenericRecord,
     override val serializersModule: SerializersModule,
-    private val configuration: AvroConfiguration,
+    private val configuration: AvroInternalConfiguration,
 ) : AbstractDecoder(), FieldDecoder {
     private enum class DecoderState(val index: Int) {
         BEFORE(0),

src/main/kotlin/com/github/avrokotlin/avro4k/encoder/ListEncoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.encoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.AbstractEncoder
@@ -15,7 +15,7 @@ import java.nio.ByteBuffer
 class ListEncoder(
     private val schema: Schema,
     override val serializersModule: SerializersModule,
-    override val configuration: AvroConfiguration,
+    override val configuration: AvroInternalConfiguration,
     private val callback: (GenericData.Array<Any?>) -> Unit,
 ) : AbstractEncoder(), StructureEncoder {
     private val list = mutableListOf<Any?>()

src/main/kotlin/com/github/avrokotlin/avro4k/encoder/MapEncoder.kt

@@ -1,6 +1,6 @@
 package com.github.avrokotlin.avro4k.encoder
 
-import com.github.avrokotlin.avro4k.AvroConfiguration
+import com.github.avrokotlin.avro4k.AvroInternalConfiguration
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.descriptors.SerialDescriptor
@@ -16,7 +16,7 @@ import java.nio.ByteBuffer
 class MapEncoder(
     schema: Schema,
     override val serializersModule: SerializersModule,
-    override val configuration: AvroConfiguration,
+    override val configuration: AvroInternalConfiguration,
     private val callback: (Map<Utf8, *>) -> Unit,
 ) : AbstractEncoder(),
     CompositeEncoder,