Package org.apache.iceberg.view

Class BaseViewOperations

java.lang.Object

org.apache.iceberg.view.BaseViewOperations

All Implemented Interfaces:

ViewOperations

Direct Known Subclasses:

JdbcViewOperations, NessieViewOperations

public abstract class BaseViewOperations
extends java.lang.Object
implements ViewOperations

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseViewOperations()

Method Summary

Modifier and Type	Method	Description
void	commit(ViewMetadata base, ViewMetadata metadata)	Replace the base view metadata with a new version.
ViewMetadata	current()	Return the currently loaded view metadata, without checking for updates.
protected java.lang.String	currentMetadataLocation()
protected int	currentVersion()
protected void	disableRefresh()
protected abstract void	doCommit(ViewMetadata base, ViewMetadata metadata)
protected abstract void	doRefresh()
protected abstract FileIO	io()
ViewMetadata	refresh()	Return the current view metadata after checking for updates.
protected void	refreshFromMetadataLocation(java.lang.String newLocation)
protected void	refreshFromMetadataLocation(java.lang.String newLocation, java.util.function.Predicate<java.lang.Exception> shouldRetry, int numRetries)
protected void	refreshFromMetadataLocation(java.lang.String newLocation, java.util.function.Predicate<java.lang.Exception> shouldRetry, int numRetries, java.util.function.Function<java.lang.String,ViewMetadata> metadataLoader)
protected void	requestRefresh()
protected abstract java.lang.String	viewName()
protected java.lang.String	writeNewMetadataIfRequired(ViewMetadata metadata)

Methods inherited from class java.lang.Object

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

Constructor Detail

BaseViewOperations

protected BaseViewOperations()

Method Detail

requestRefresh

protected void requestRefresh()

disableRefresh

protected void disableRefresh()

doRefresh

protected abstract void doRefresh()

doCommit

protected abstract void doCommit(ViewMetadata base,
                                 ViewMetadata metadata)

viewName

protected abstract java.lang.String viewName()

io

protected abstract FileIO io()

currentMetadataLocation

protected java.lang.String currentMetadataLocation()

currentVersion

protected int currentVersion()

current

public ViewMetadata current()

Description copied from interface: ViewOperations

Return the currently loaded view metadata, without checking for updates.

Specified by:

current in interface ViewOperations

Returns:

view metadata

refresh

public ViewMetadata refresh()

Description copied from interface: ViewOperations

Return the current view metadata after checking for updates.

Specified by:

refresh in interface ViewOperations

Returns:

view metadata

commit

public void commit(ViewMetadata base,
                   ViewMetadata metadata)

Description copied from interface: ViewOperations

Replace the base view metadata with a new version.

This method should implement and document atomicity guarantees.

Implementations must check that the base metadata is current to avoid overwriting updates. Once the atomic commit operation succeeds, implementations must not perform any operations that may fail because failure in this method cannot be distinguished from commit failure.

Implementations should throw a CommitStateUnknownException in cases where it cannot be determined if the commit succeeded or failed. For example if a network partition causes the confirmation of the commit to be lost, the implementation should throw a CommitStateUnknownException. An unknown state indicates to downstream users of this API that it is not safe to perform clean up and remove any files. In general, strict metadata cleanup will only trigger cleanups when the commit fails with an exception implementing the marker interface CleanableFailure. All other exceptions will be treated as if the commit has failed.

Specified by:

commit in interface ViewOperations

Parameters:

base - view metadata on which changes were based

metadata - new view metadata with updates

writeNewMetadataIfRequired

protected java.lang.String writeNewMetadataIfRequired(ViewMetadata metadata)

refreshFromMetadataLocation

protected void refreshFromMetadataLocation(java.lang.String newLocation)

refreshFromMetadataLocation

protected void refreshFromMetadataLocation(java.lang.String newLocation,
                                           java.util.function.Predicate<java.lang.Exception> shouldRetry,
                                           int numRetries)

refreshFromMetadataLocation

protected void refreshFromMetadataLocation(java.lang.String newLocation,
                                           java.util.function.Predicate<java.lang.Exception> shouldRetry,
                                           int numRetries,
                                           java.util.function.Function<java.lang.String,ViewMetadata> metadataLoader)