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feat(Impact Analysis): Support impact analysis to check all downstrea…
…ms of given entity (datahub-project#4322)
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74
...rc/main/java/com/linkedin/datahub/graphql/resolvers/load/EntityLineageResultResolver.java
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| @@ -0,0 +1,74 @@ | ||
| package com.linkedin.datahub.graphql.resolvers.load; | ||
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| import com.linkedin.datahub.graphql.QueryContext; | ||
| import com.linkedin.datahub.graphql.generated.Entity; | ||
| import com.linkedin.datahub.graphql.generated.EntityLineageResult; | ||
| import com.linkedin.datahub.graphql.generated.LineageDirection; | ||
| import com.linkedin.datahub.graphql.generated.LineageInput; | ||
| import com.linkedin.datahub.graphql.generated.LineageRelationship; | ||
| import com.linkedin.datahub.graphql.types.common.mappers.UrnToEntityMapper; | ||
| import com.linkedin.metadata.graph.GraphClient; | ||
| import graphql.schema.DataFetcher; | ||
| import graphql.schema.DataFetchingEnvironment; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import java.util.stream.Collectors; | ||
| import javax.annotation.Nullable; | ||
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| import static com.linkedin.datahub.graphql.resolvers.ResolverUtils.bindArgument; | ||
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| /** | ||
| * GraphQL Resolver responsible for fetching lineage relationships between entities in the DataHub graph. | ||
| * Lineage relationship denotes whether an entity is directly upstream or downstream of another entity | ||
| */ | ||
| public class EntityLineageResultResolver implements DataFetcher<CompletableFuture<EntityLineageResult>> { | ||
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| private final GraphClient _graphClient; | ||
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| public EntityLineageResultResolver(final GraphClient graphClient) { | ||
| _graphClient = graphClient; | ||
| } | ||
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| @Override | ||
| public CompletableFuture<EntityLineageResult> get(DataFetchingEnvironment environment) { | ||
| final QueryContext context = environment.getContext(); | ||
| final String urn = ((Entity) environment.getSource()).getUrn(); | ||
| final LineageInput input = bindArgument(environment.getArgument("input"), LineageInput.class); | ||
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| final LineageDirection lineageDirection = input.getDirection(); | ||
| @Nullable | ||
| final Integer start = input.getStart(); // Optional! | ||
| @Nullable | ||
| final Integer count = input.getCount(); // Optional! | ||
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| com.linkedin.metadata.graph.LineageDirection resolvedDirection = | ||
| com.linkedin.metadata.graph.LineageDirection.valueOf(lineageDirection.toString()); | ||
| return CompletableFuture.supplyAsync(() -> mapEntityRelationships(lineageDirection, | ||
| _graphClient.getLineageEntities(urn, resolvedDirection, start, count, 1, context.getActorUrn()))); | ||
| } | ||
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| private EntityLineageResult mapEntityRelationships(final LineageDirection lineageDirection, | ||
| final com.linkedin.metadata.graph.EntityLineageResult entityLineageResult) { | ||
| final EntityLineageResult result = new EntityLineageResult(); | ||
| result.setStart(entityLineageResult.getStart()); | ||
| result.setCount(entityLineageResult.getCount()); | ||
| result.setTotal(entityLineageResult.getTotal()); | ||
| result.setRelationships(entityLineageResult.getRelationships() | ||
| .stream() | ||
| .map(entityRelationship -> mapEntityRelationship(lineageDirection, entityRelationship)) | ||
| .collect(Collectors.toList())); | ||
| return result; | ||
| } | ||
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| private LineageRelationship mapEntityRelationship(final LineageDirection direction, | ||
| final com.linkedin.metadata.graph.LineageRelationship lineageRelationship) { | ||
| final LineageRelationship result = new LineageRelationship(); | ||
| final Entity partialEntity = UrnToEntityMapper.map(lineageRelationship.getEntity()); | ||
| if (partialEntity != null) { | ||
| result.setEntity(partialEntity); | ||
| } | ||
| result.setType(lineageRelationship.getType()); | ||
| result.setDegree(lineageRelationship.getDegree()); | ||
| return result; | ||
| } | ||
| } |
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