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Retriveing singleton property fetchers will not create DataFetcherFactoryEnvironment objects by bbakerman · Pull Request #3942 · graphql-java/graphql-java · GitHub

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Retriveing singleton property fetchers will not create DataFetcherFactoryEnvironment objects #3942

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Merged
dondonz merged 1 commit into from
May 14, 2025
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Retriveing singleton property fetchers will not create DataFetcherFactoryEnvironment objects #3942

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13 changes: 12 additions & 1 deletion src/main/java/graphql/schema/SingletonPropertyDataFetcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,18 @@ public class SingletonPropertyDataFetcher<T> implements LightDataFetcher<T> {

private static final SingletonPropertyDataFetcher<Object> SINGLETON_FETCHER = new SingletonPropertyDataFetcher<>();

private static final DataFetcherFactory<?> SINGLETON_FETCHER_FACTORY = environment -> SINGLETON_FETCHER;
private static final DataFetcherFactory<?> SINGLETON_FETCHER_FACTORY = new DataFetcherFactory<Object>() {
@SuppressWarnings("deprecation")
@Override
public DataFetcher<Object> get(DataFetcherFactoryEnvironment environment) {
return SINGLETON_FETCHER;
}

@Override
public DataFetcher<Object> get(GraphQLFieldDefinition fieldDefinition) {
return SINGLETON_FETCHER;
}
};

bbakerman Apr 29, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

because I didnt override the default public DataFetcher<Object> get(GraphQLFieldDefinition fieldDefinition) then it returned null and hence it went to the older more heavy weight object and a DataFetcherFactoryEnvironment needed to be allocated.

This now means that no DataFetcherFactoryEnvironment objects are allocated for property fetchers

bbakerman Apr 29, 2025 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I cant unit test this - its not observable - but profiling shows it to be working!

dondonz May 14, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Nice you could verify via profiling

/**
* This returns the same singleton {@link LightDataFetcher} that fetches property values
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