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Try to make federation work (with reactive) #1898

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Sep 5, 2023
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Try to make federation work (with reactive) #1898

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22 changes: 16 additions & 6 deletions server/implementation/src/main/java/io/smallrye/graphql/bootstrap/FederationDataFetcher.java
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Original file line number Diff line number Diff line change
@@ -1,15 +1,17 @@
package io.smallrye.graphql.bootstrap;

import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toSet;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;

import com.apollographql.federation.graphqljava._Entity;

import graphql.execution.Async;
import graphql.schema.DataFetcher;
import graphql.schema.DataFetchingEnvironment;
import graphql.schema.DelegatingDataFetchingEnvironment;
Expand All @@ -20,7 +22,7 @@
import graphql.schema.GraphQLObjectType;
import graphql.schema.GraphQLOutputType;

class FederationDataFetcher implements DataFetcher<List<Object>> {
class FederationDataFetcher implements DataFetcher<CompletableFuture<List<Object>>> {

private final GraphQLObjectType queryType;
private final GraphQLCodeRegistry codeRegistry;
Expand All @@ -31,10 +33,11 @@ public FederationDataFetcher(GraphQLObjectType queryType, GraphQLCodeRegistry co
}

@Override
public List<Object> get(DataFetchingEnvironment environment) throws Exception {
return environment.<List<Map<String, Object>>> getArgument(_Entity.argumentName).stream()
.map(representations -> fetchEntities(environment, representations))
.collect(toList());
public CompletableFuture<List<Object>> get(DataFetchingEnvironment environment) throws Exception {
return sequence(environment.<List<Map<String, Object>>> getArgument(_Entity.argumentName).stream()
.map(representations -> fetchEntities(environment, representations)).map(Async::toCompletableFuture)
.collect(Collectors.toList()));

}

private Object fetchEntities(DataFetchingEnvironment env, Map<String, Object> representations) {
Expand Down Expand Up @@ -90,4 +93,11 @@ public <T> T getArgumentOrDefault(String name, T defaultValue) {
throw new RuntimeException("can't fetch data from " + field, e);
}
}

static <T> CompletableFuture<List<T>> sequence(List<CompletableFuture<T>> com) {
return CompletableFuture.allOf(com.toArray(new CompletableFuture<?>[0]))
.thenApply(v -> com.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList()));
}
}
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