Adding support for making the exception handlers async #2371
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andimarek
reviewed
Jun 4, 2021
| * | ||
| * @return a result that can contain custom formatted {@link graphql.GraphQLError}s | ||
| */ | ||
| default CompletionStage<DataFetcherExceptionHandlerResult> handleException(DataFetcherExceptionHandlerParameters handlerParameters) { |
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I think we use CompletableFuture everywhere, no?
bbakerman
commented
Jun 4, 2021
| default CompletionStage<DataFetcherExceptionHandlerResult> handleException(DataFetcherExceptionHandlerParameters handlerParameters) { | ||
| DataFetcherExceptionHandlerResult result = onException(handlerParameters); | ||
| return CompletableFuture.completedFuture(result); | ||
| } |
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The consuming code only calls this method. It delegates back to the old sync method. So any current implementations will continue to work.
Later at some point we can remove the deprecated version for a breaking change
bbakerman
commented
Jun 4, 2021
| } | ||
| }) | ||
| .thenCompose(errorOrValue -> errorOrValue) | ||
| .thenApply(result -> unboxPossibleDataFetcherResult(executionContext, parameters, result)); |
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we need to flat map the above CF<T> back to a
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I made it use that. I am confused as to whether CompletionStage is every
worth it and when to use it
…On Fri, 4 Jun 2021 at 18:43, Andreas Marek ***@***.***> wrote:
***@***.**** commented on this pull request.
------------------------------
In src/main/java/graphql/execution/DataFetcherExceptionHandler.java
<#2371 (comment)>
:
> DataFetcherExceptionHandlerResult onException(DataFetcherExceptionHandlerParameters handlerParameters);
+
+ /**
+ * When an exception occurs during a call to a ***@***.*** DataFetcher} then this handler
+ * is called to shape the errors that should be placed in the ***@***.*** ExecutionResult#getErrors()}
+ * list of errors.
+ *
+ * @param handlerParameters the parameters to this callback
+ *
+ * @return a result that can contain custom formatted ***@***.*** graphql.GraphQLError}s
+ */
+ default CompletionStage<DataFetcherExceptionHandlerResult> handleException(DataFetcherExceptionHandlerParameters handlerParameters) {
I think we use CompletableFuture everywhere, no?
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@bbakerman would it be possible to merge this PR? or at least the commit e7f5a91 ? |
andimarek
approved these changes
Jun 23, 2021
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@dfa1 - done |
This was referenced Aug 3, 2021
Update dependency com.graphql-java:graphql-java to v17
graphql-java-kickstart/graphql-java-tools#560
Merged
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This makes the data fetching exception handlers async.
The old method is left in place for backwards compatibiility reasons but the new async version is the one called.
It will delegate back to the old sync method.
New implementations can use proper async processing in making fetching errros