Package org.apache.nutch.db

Web database: tracks page fetches and link structure.

See:
Description

Interface Summary

IWebDBReader	IWebDBReader is an interface to the consolidated page/link database.
IWebDBWriter	IWebDBWriter is an interface to the consolidated page/link database.

Class Summary

DBKeyDivision	DBKeyDivision exists for other DB classes to figure out how to find the right distributed-DB section.
DBSectionReader	DBSectionReader reads a discrete portion of a WebDB.
DistributedWebDBReader	The WebDBReader implements all the read-only parts of accessing our web database.
DistributedWebDBWriter	This is a wrapper class that allows us to reorder write operations to the linkdb and pagedb.
DistributedWebDBWriter.LinkInstruction	Holds an instruction over a Link.
DistributedWebDBWriter.LinkInstruction.MD5Comparator	Sorts the instruction first by Md5, then by opcode.
DistributedWebDBWriter.LinkInstruction.UrlComparator	Sorts the instruction first by url, then by opcode.
DistributedWebDBWriter.LinkInstructionWriter	LinkInstructionWriter very efficiently writes a LinkInstruction to an EditSectionGroupWriter.
DistributedWebDBWriter.PageInstruction	PageInstruction holds an operation over a Page.
DistributedWebDBWriter.PageInstruction.PageComparator	Sorts the instruction first by Page, then by opcode.
DistributedWebDBWriter.PageInstruction.UrlComparator	Sorts the instruction first by url, then by opcode.
DistributedWebDBWriter.PageInstructionWriter	PageInstructionWriter very efficiently writes a PageInstruction to an EditSectionGroupWriter.
EditSectionGroupReader	The EditSectionGroupReader will read in an edits-file that was built in a distributed way.
EditSectionGroupWriter	The EditSectionGroupWriter maintains a set of EditSectionWriter objects.
EditSectionGroupWriter.KeyExtractor	Edit instructions are Comparable, but they also have an "inner" key like MD5Hash or URL that is also Comparable.
EditSectionGroupWriter.LinkMD5Extractor	Get the MD5 from a LinkInstruction
EditSectionGroupWriter.LinkURLExtractor	Get the URL from a LinkInstruction
EditSectionGroupWriter.PageMD5Extractor	Get the MD5 from a PageInstruction
EditSectionGroupWriter.PageURLExtractor	Get the URL from a PageInstruction
EditSectionWriter	EditSectionWriter writes a discrete portion of a WebDB.
Link	This is the field in the Link Database.
Link.MD5Comparator	MD5Comparator is the opposite.
Link.UrlComparator	URLComparator uses the standard method where, uh, the URL comes first.
Page	A row in the Page Database.
Page.Comparator	Compares pages by MD5, then by URL.
Page.UrlComparator	Compares pages by URL only.
WebDBAnchors	Utility that extracts the set of anchor texts for a URL from the database.
WebDBInjector	This class takes a flat file of URLs and adds them as entries into a pagedb.
WebDBReader	The WebDBReader implements all the read-only parts of accessing our web database.
WebDBWriter	This is a wrapper class that allows us to reorder write operations to the linkdb and pagedb.
WebDBWriter.LinkInstruction	Holds an instruction over a Link.
WebDBWriter.LinkInstruction.MD5Comparator	Sorts the instruction first by Md5, then by opcode.
WebDBWriter.LinkInstruction.UrlComparator	Sorts the instruction first by url, then by opcode.
WebDBWriter.LinkInstructionWriter	LinkInstructionWriter very efficiently writes a LinkInstruction to a SequenceFile.Writer.
WebDBWriter.PageInstruction	PageInstruction holds an operation over a Page.
WebDBWriter.PageInstruction.PageComparator	Sorts the instruction first by Page, then by opcode.
WebDBWriter.PageInstruction.UrlComparator	Sorts the instruction first by url, then by opcode.
WebDBWriter.PageInstructionWriter	PageInstructionWriter very efficiently writes a PageInstruction to a SequenceFile.Writer.

Package org.apache.nutch.db Description

Web database: tracks page fetches and link structure.