org.apache.nutch.db
Class EditSectionWriter

java.lang.Object
  org.apache.nutch.db.EditSectionWriter

public class EditSectionWriter

extends Object

EditSectionWriter writes a discrete portion of a WebDB. The WebDBWriter class may instantiate many EditSectionWriter objects to do its work (and always instantiates at least one).

Author:

Mike Cafarella

Field Summary

static String	EDITS_PREFIX
static String	WRITE_METAINFO_PREFIX

Constructor Summary

EditSectionWriter(NutchFileSystem nfs, String label, int targetNum, int writerNum, Class keyClass, Class valClass)
Make a EditSectionWriter for the appropriate file.

Method Summary

void	append(WritableComparable key, Writable val) Add a key/val pair
void	close() Close down the EditSectionWriter.

Methods inherited from class java.lang.Object

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

Field Detail

WRITE_METAINFO_PREFIX

public static final String WRITE_METAINFO_PREFIX

See Also:

Constant Field Values

EDITS_PREFIX

public static final String EDITS_PREFIX

See Also:

Constant Field Values

Constructor Detail

EditSectionWriter

public EditSectionWriter(NutchFileSystem nfs,
                         String label,
                         int targetNum,
                         int writerNum,
                         Class keyClass,
                         Class valClass)
                  throws IOException

Make a EditSectionWriter for the appropriate file.

Method Detail

append

public void append(WritableComparable key,
                   Writable val)
            throws IOException

Add a key/val pair

Throws:

IOException

close

public void close()
           throws IOException

Close down the EditSectionWriter. Afterwards, write down the completion file (including the number of edits inside).

Throws:

IOException