org.apache.beam.sdk.extensions.jackson

Class AsJsons.AsJsonsWithFailures<FailureT>

java.lang.Object

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

org.apache.beam.sdk.extensions.jackson.AsJsons.AsJsonsWithFailures<FailureT>

All Implemented Interfaces:

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

Enclosing class:

AsJsons<InputT>

public class AsJsons.AsJsonsWithFailures<FailureT>
extends org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<InputT>,org.apache.beam.sdk.transforms.WithFailures.Result<org.apache.beam.sdk.values.PCollection<java.lang.String>,FailureT>>

A PTransform that adds exception handling to AsJsons.

See Also:

Serialized Form

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
AsJsons.AsJsonsWithFailures<FailureT>	exceptionsVia(org.apache.beam.sdk.transforms.ProcessFunction<org.apache.beam.sdk.transforms.WithFailures.ExceptionElement<InputT>,FailureT> exceptionHandler) Returns a new AsJsons.AsJsonsWithFailures transform that catches exceptions raised while writing JSON 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<java.lang.String>,FailureT>	expand(org.apache.beam.sdk.values.PCollection<InputT> input)

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

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

exceptionsVia

public AsJsons.AsJsonsWithFailures<FailureT> exceptionsVia(org.apache.beam.sdk.transforms.ProcessFunction<org.apache.beam.sdk.transforms.WithFailures.ExceptionElement<InputT>,FailureT> exceptionHandler)

Returns a new AsJsons.AsJsonsWithFailures transform that catches exceptions raised while writing JSON 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 AsJsons.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<String>, KV<MyPojo, Map<String, String>>> result =
     pojos.apply(
         AsJsons.of(MyPojo.class)
             .exceptionsInto(
                 TypeDescriptors.kvs(
                     TypeDescriptor.of(MyPojo.class), TypeDescriptors.strings()))
             .exceptionsVia(
                 f -> KV.of(f.element(), f.exception().getClass().getCanonicalName())));

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

expand

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

Specified by:

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