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Copy file name to clipboardExpand all lines: website/versioned_docs/version-8.x.x/schema-generator/execution/fetching-data.md
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@@ -55,3 +55,19 @@ You can provide your own custom data fetchers to resolve functions and propertie
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to your[SchemaGeneratorConfig](https://github.com/ExpediaGroup/graphql-kotlin/blob/master/generator/graphql-kotlin-schema-generator/src/main/kotlin/com/expediagroup/graphql/generator/SchemaGeneratorConfig.kt).
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See our[spring example app](https://github.com/ExpediaGroup/graphql-kotlin/tree/master/examples/server/spring-server) for an example of`CustomDataFetcherFactoryProvider`.
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:::info
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Currently, graphql-kotlin, through the[KotlinDataFetcherFactoryProvider](https://github.com/ExpediaGroup/graphql-kotlin/blob/master/generator/graphql-kotlin-schema-generator/src/main/kotlin/com/expediagroup/graphql/generator/execution/KotlinDataFetcherFactoryProvider.kt#L62)
per source's property. This instance is created[every single time](https://github.com/graphql-java/graphql-java/blob/master/src/main/java/graphql/schema/GraphQLCodeRegistry.java#L100)
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the graphql-java[DataFetcherFactory](https://github.com/graphql-java/graphql-java/blob/master/src/main/java/graphql/schema/DataFetcherFactory.java) is invoked,
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which happens to be on runtime per property per GraphQL operation.
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If you want to avoid that, use or extend the[SimpleSingletonKotlinDataFetcherFactoryProvider](https://github.com/ExpediaGroup/graphql-kotlin/blob/master/generator/graphql-kotlin-schema-generator/src/main/kotlin/com/expediagroup/graphql/generator/execution/KotlinDataFetcherFactoryProvider.kt#L72) which will provide a
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[SingletonPropertyDataFetcher](https://github.com/ExpediaGroup/graphql-kotlin/blob/master/generator/graphql-kotlin-schema-generator/src/main/kotlin/com/expediagroup/graphql/generator/execution/SingletonPropertyDataFetcher.kt) that will host its own singleton factory, and it will store
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all`KProperty.Getter<*>`s in a`ConcurrentHashMap`.
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This is inspired by this[graphql-java's PR](https://github.com/graphql-java/graphql-java/pull/3754)
