public class ReadSpannerSchema extends org.apache.beam.sdk.transforms.DoFn<java.lang.Void,SpannerSchema>
DoFn
reads Cloud Spanner 'information_schema.*' tables to build the SpannerSchema
.org.apache.beam.sdk.transforms.DoFn.AlwaysFetched, org.apache.beam.sdk.transforms.DoFn.BoundedPerElement, org.apache.beam.sdk.transforms.DoFn.BundleFinalizer, org.apache.beam.sdk.transforms.DoFn.Element, org.apache.beam.sdk.transforms.DoFn.FieldAccess, org.apache.beam.sdk.transforms.DoFn.FinishBundle, org.apache.beam.sdk.transforms.DoFn.FinishBundleContext, org.apache.beam.sdk.transforms.DoFn.GetInitialRestriction, org.apache.beam.sdk.transforms.DoFn.GetInitialWatermarkEstimatorState, org.apache.beam.sdk.transforms.DoFn.GetRestrictionCoder, org.apache.beam.sdk.transforms.DoFn.GetSize, org.apache.beam.sdk.transforms.DoFn.GetWatermarkEstimatorStateCoder, org.apache.beam.sdk.transforms.DoFn.Key, org.apache.beam.sdk.transforms.DoFn.MultiOutputReceiver, org.apache.beam.sdk.transforms.DoFn.NewTracker, org.apache.beam.sdk.transforms.DoFn.NewWatermarkEstimator, org.apache.beam.sdk.transforms.DoFn.OnTimer, org.apache.beam.sdk.transforms.DoFn.OnTimerContext, org.apache.beam.sdk.transforms.DoFn.OnTimerFamily, org.apache.beam.sdk.transforms.DoFn.OnWindowExpiration, org.apache.beam.sdk.transforms.DoFn.OnWindowExpirationContext, org.apache.beam.sdk.transforms.DoFn.OutputReceiver<T>, org.apache.beam.sdk.transforms.DoFn.ProcessContext, org.apache.beam.sdk.transforms.DoFn.ProcessContinuation, org.apache.beam.sdk.transforms.DoFn.ProcessElement, org.apache.beam.sdk.transforms.DoFn.RequiresStableInput, org.apache.beam.sdk.transforms.DoFn.RequiresTimeSortedInput, org.apache.beam.sdk.transforms.DoFn.Restriction, org.apache.beam.sdk.transforms.DoFn.Setup, org.apache.beam.sdk.transforms.DoFn.SideInput, org.apache.beam.sdk.transforms.DoFn.SplitRestriction, org.apache.beam.sdk.transforms.DoFn.StartBundle, org.apache.beam.sdk.transforms.DoFn.StartBundleContext, org.apache.beam.sdk.transforms.DoFn.StateId, org.apache.beam.sdk.transforms.DoFn.Teardown, org.apache.beam.sdk.transforms.DoFn.TimerFamily, org.apache.beam.sdk.transforms.DoFn.TimerId, org.apache.beam.sdk.transforms.DoFn.Timestamp, org.apache.beam.sdk.transforms.DoFn.TruncateRestriction, org.apache.beam.sdk.transforms.DoFn.UnboundedPerElement, org.apache.beam.sdk.transforms.DoFn.WatermarkEstimatorState, org.apache.beam.sdk.transforms.DoFn.WindowedContext
Constructor and Description |
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ReadSpannerSchema(SpannerConfig config,
org.apache.beam.sdk.values.PCollectionView<com.google.cloud.spanner.Dialect> dialectView)
Constructor for creating an instance of the ReadSpannerSchema class.
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ReadSpannerSchema(SpannerConfig config,
org.apache.beam.sdk.values.PCollectionView<com.google.cloud.spanner.Dialect> dialectView,
java.util.Set<java.lang.String> allowedTableNames)
Constructor for creating an instance of the ReadSpannerSchema class.
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Modifier and Type | Method and Description |
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void |
processElement(org.apache.beam.sdk.transforms.DoFn.ProcessContext c) |
void |
setup() |
void |
teardown() |
public ReadSpannerSchema(SpannerConfig config, org.apache.beam.sdk.values.PCollectionView<com.google.cloud.spanner.Dialect> dialectView)
config
- The SpannerConfig object that contains the configuration for accessing the
Spanner database.dialectView
- A PCollectionView object that holds a Dialect object for the database
dialect to use for reading the Spanner schema.public ReadSpannerSchema(SpannerConfig config, org.apache.beam.sdk.values.PCollectionView<com.google.cloud.spanner.Dialect> dialectView, java.util.Set<java.lang.String> allowedTableNames)
config
- The SpannerConfig object that contains the configuration for accessing the
Spanner database.dialectView
- A PCollectionView object that holds a Dialect object for the database
dialect to use for reading the Spanner schema.allowedTableNames
- A set of allowed table names to be used when reading the Spanner
schema.@DoFn.Setup public void setup() throws java.lang.Exception
java.lang.Exception
@DoFn.Teardown public void teardown() throws java.lang.Exception
java.lang.Exception
@DoFn.ProcessElement public void processElement(org.apache.beam.sdk.transforms.DoFn.ProcessContext c) throws java.lang.Exception
java.lang.Exception