Examples with DataFetchingFieldSelectionSet graphql.schema.DataFetchingFieldSelectionSet used on opensource projects

Example 1 with DataFetchingFieldSelectionSet

use of graphql.schema.DataFetchingFieldSelectionSet in project graphql-java by graphql-java.

the class ExecutionStrategy method fetchField.

/**
 * Called to fetch a value for a field from the {@link DataFetcher} associated with the field
 * {@link GraphQLFieldDefinition}.
 * <p>
 * Graphql fragments mean that for any give logical field can have one or more {@link Field} values associated with it
 * in the query, hence the fieldList.  However the first entry is representative of the field for most purposes.
 *
 * @param executionContext contains the top level execution parameters
 * @param parameters       contains the parameters holding the fields to be executed and source object
 *
 * @return a fetched object
 *
 * @throws NonNullableFieldWasNullException if a non null field resolves to a null value
 */
protected CompletableFuture<Object> fetchField(ExecutionContext executionContext, ExecutionStrategyParameters parameters) {
    Field field = parameters.getField().get(0);
    GraphQLObjectType parentType = parameters.getTypeInfo().castType(GraphQLObjectType.class);
    GraphQLFieldDefinition fieldDef = getFieldDef(executionContext.getGraphQLSchema(), parentType, field);
    GraphqlFieldVisibility fieldVisibility = executionContext.getGraphQLSchema().getFieldVisibility();
    Map<String, Object> argumentValues = valuesResolver.getArgumentValues(fieldVisibility, fieldDef.getArguments(), field.getArguments(), executionContext.getVariables());
    GraphQLOutputType fieldType = fieldDef.getType();
    DataFetchingFieldSelectionSet fieldCollector = DataFetchingFieldSelectionSetImpl.newCollector(executionContext, fieldType, parameters.getField());
    ExecutionTypeInfo fieldTypeInfo = fieldTypeInfo(parameters, fieldDef);
    DataFetchingEnvironment environment = newDataFetchingEnvironment(executionContext).source(parameters.getSource()).arguments(argumentValues).fieldDefinition(fieldDef).fields(parameters.getField()).fieldType(fieldType).fieldTypeInfo(fieldTypeInfo).parentType(parentType).selectionSet(fieldCollector).build();
    Instrumentation instrumentation = executionContext.getInstrumentation();
    InstrumentationFieldFetchParameters instrumentationFieldFetchParams = new InstrumentationFieldFetchParameters(executionContext, fieldDef, environment);
    InstrumentationContext<Object> fetchCtx = instrumentation.beginFieldFetch(instrumentationFieldFetchParams);
    CompletableFuture<Object> fetchedValue;
    DataFetcher dataFetcher = fieldDef.getDataFetcher();
    dataFetcher = instrumentation.instrumentDataFetcher(dataFetcher, instrumentationFieldFetchParams);
    ExecutionId executionId = executionContext.getExecutionId();
    try {
        log.debug("'{}' fetching field '{}' using data fetcher '{}'...", executionId, fieldTypeInfo.getPath(), dataFetcher.getClass().getName());
        Object fetchedValueRaw = dataFetcher.get(environment);
        log.debug("'{}' field '{}' fetch returned '{}'", executionId, fieldTypeInfo.getPath(), fetchedValueRaw == null ? "null" : fetchedValueRaw.getClass().getName());
        fetchedValue = Async.toCompletableFuture(fetchedValueRaw);
    } catch (Exception e) {
        log.debug(String.format("'%s', field '%s' fetch threw exception", executionId, fieldTypeInfo.getPath()), e);
        fetchedValue = new CompletableFuture<>();
        fetchedValue.completeExceptionally(e);
    }
    fetchCtx.onDispatched(fetchedValue);
    return fetchedValue.handle((result, exception) -> {
        fetchCtx.onCompleted(result, exception);
        if (exception != null) {
            handleFetchingException(executionContext, parameters, field, fieldDef, argumentValues, environment, exception);
            return null;
        } else {
            return result;
        }
    }).thenApply(result -> unboxPossibleDataFetcherResult(executionContext, parameters, result)).thenApply(this::unboxPossibleOptional);
}

Example 2 with DataFetchingFieldSelectionSet

use of graphql.schema.DataFetchingFieldSelectionSet in project graphql-java by graphql-java.

the class BatchedExecutionStrategy method fetchData.

private CompletableFuture<FetchedValues> fetchData(ExecutionContext executionContext, ExecutionStrategyParameters parameters, String fieldName, ExecutionNode node, GraphQLFieldDefinition fieldDef) {
    GraphQLObjectType parentType = node.getType();
    List<Field> fields = node.getFields().get(fieldName);
    List<MapOrList> parentResults = node.getParentResults();
    GraphqlFieldVisibility fieldVisibility = executionContext.getGraphQLSchema().getFieldVisibility();
    Map<String, Object> argumentValues = valuesResolver.getArgumentValues(fieldVisibility, fieldDef.getArguments(), fields.get(0).getArguments(), executionContext.getVariables());
    GraphQLOutputType fieldType = fieldDef.getType();
    DataFetchingFieldSelectionSet fieldCollector = DataFetchingFieldSelectionSetImpl.newCollector(executionContext, fieldType, fields);
    DataFetchingEnvironment environment = newDataFetchingEnvironment(executionContext).source(node.getSources()).arguments(argumentValues).fieldDefinition(fieldDef).fields(fields).fieldType(fieldDef.getType()).fieldTypeInfo(parameters.getTypeInfo()).parentType(parentType).selectionSet(fieldCollector).build();
    Instrumentation instrumentation = executionContext.getInstrumentation();
    InstrumentationFieldFetchParameters instrumentationFieldFetchParameters = new InstrumentationFieldFetchParameters(executionContext, fieldDef, environment);
    InstrumentationContext<Object> fetchCtx = instrumentation.beginFieldFetch(instrumentationFieldFetchParameters);
    CompletableFuture<Object> fetchedValue;
    try {
        DataFetcher<?> dataFetcher = instrumentation.instrumentDataFetcher(getDataFetcher(fieldDef), instrumentationFieldFetchParameters);
        Object fetchedValueRaw = dataFetcher.get(environment);
        fetchedValue = Async.toCompletableFuture(fetchedValueRaw);
    } catch (Exception e) {
        fetchedValue = new CompletableFuture<>();
        fetchedValue.completeExceptionally(e);
    }
    return fetchedValue.thenApply((result) -> assertResult(parentResults, result)).whenComplete(fetchCtx::onCompleted).handle(handleResult(executionContext, parameters, parentResults, fields, fieldDef, argumentValues, environment));
}