org.apache.beam.sdk.extensions.jackson

Class ParseJsons.ParseJsonsWithFailures<FailureT>

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<java.lang.String>,org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<OutputT>,FailureT>>

org.apache.beam.sdk.extensions.jackson.ParseJsons.ParseJsonsWithFailures<FailureT>

All Implemented Interfaces:

java.io.Serializable, org.apache.beam.sdk.transforms.display.HasDisplayData

Enclosing class:

ParseJsons<OutputT>

public class ParseJsons.ParseJsonsWithFailures<FailureT>
extends org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<java.lang.String>,org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<OutputT>,FailureT>>

A PTransform that adds exception handling to ParseJsons.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

annotations, displayData, name, resourceHints

Method Summary

Modifier and Type	Method and Description
ParseJsons.ParseJsonsWithFailures<FailureT>	exceptionsVia(org.apache.beam.sdk.transforms.ProcessFunction<org.apache.beam.sdk.transforms.WithFailures.ExceptionElement<java.lang.String>,FailureT> exceptionHandler) Returns a new ParseJsons.ParseJsonsWithFailures transform that catches exceptions raised while parsing elements, passing the raised exception instance and the input element being processed through the given exceptionHandler and emitting the result to a failure collection.
org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<OutputT>,FailureT>	expand(org.apache.beam.sdk.values.PCollection<java.lang.String> input)

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

exceptionsVia

public ParseJsons.ParseJsonsWithFailures<FailureT> exceptionsVia(org.apache.beam.sdk.transforms.ProcessFunction<org.apache.beam.sdk.transforms.WithFailures.ExceptionElement<java.lang.String>,FailureT> exceptionHandler)

Returns a new ParseJsons.ParseJsonsWithFailures transform that catches exceptions raised while parsing elements, passing the raised exception instance and the input element being processed through the given exceptionHandler and emitting the result to a failure collection. It is supposed to be used along with ParseJsons.exceptionsInto(TypeDescriptor) and get lambda function as exception handler.

See WithFailures documentation for usage patterns of the returned WithFailures.Result.

Example usage:

 WithFailures.Result<PCollection<MyPojo>, KV<String, Map<String, String>>> result =
     json.apply(
         ParseJsons.of(MyPojo.class)
             .exceptionsInto(
                 TypeDescriptors.kvs(TypeDescriptors.strings(), TypeDescriptors.strings()))
             .exceptionsVia(
                 f -> KV.of(f.element(), f.exception().getClass().getCanonicalName())));

 PCollection<MyPojo> output = result.output(); // valid POJOs
 PCollection<KV<String, Map<String, String>>> failures = result.failures();
 

expand

public org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<OutputT>,FailureT> expand(org.apache.beam.sdk.values.PCollection<java.lang.String> input)

Specified by:

expand in class org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<java.lang.String>,org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<OutputT>,FailureT>>