io.druid.data

Interface SearchableVersionedDataFinder<DataDescriptor>

Type Parameters:

DataDescriptor - The containing type for the data. A simple example would be URI

All Known Implementing Classes:

HdfsFileTimestampVersionFinder, LocalFileTimestampVersionFinder, S3TimestampVersionedDataFinder

public interface SearchableVersionedDataFinder<DataDescriptor>

A class which implements SearchableVersionedDataFinder can find a DataDescriptor which describes the most up to date version of data given a base descriptor and a matching pattern. "Version" is completely dependent on the implementation but is commonly equal to the "last modified" timestamp. This is implemented explicitly for URIExtractionNamespaceFunctionFactory If you have a use case for this interface beyond URIExtractionNamespaceFunctionFactory please bring it up in the dev list.

Method Summary

Methods

Modifier and Type	Method and Description
Class<DataDescriptor>	getDataDescriptorClass()
DataDescriptor	getLatestVersion(DataDescriptor descriptorBase, Pattern pattern) Get's a DataDescriptor to the latest "version" of a data quantum starting with descriptorBase and matching based on pattern

Method Detail

getLatestVersion

DataDescriptor getLatestVersion(DataDescriptor descriptorBase,
                              Pattern pattern)

Get's a DataDescriptor to the latest "version" of a data quantum starting with descriptorBase and matching based on pattern

Parameters:

descriptorBase - The base unit of describing the data.

pattern - A pattern which must match in order for a DataDescriptor to be considered.

Returns:

A DataDescriptor which matches pattern, is a child of descriptorBase, and is of the most recent "version" at some point during the method execution.

getDataDescriptorClass

Class<DataDescriptor> getDataDescriptorClass()

Returns:

The class of the descriptor for the data