jdbm.recman

Class PhysicalRowIdManager

java.lang.Object

jdbm.recman.PhysicalRowIdManager

final class PhysicalRowIdManager
extends java.lang.Object

This class manages physical row ids, and their data.

Field Summary

Fields

Modifier and Type	Field and Description
private RecordFile	file The file we're talking to and the associated page manager.
private FreePhysicalRowIdPageManager	freePageManager The FreePage manager
private PageManager	pageManager The page manager

Constructor Summary

Constructors

Constructor and Description
PhysicalRowIdManager(PageManager pageManager) Creates a new rowid manager using the indicated record file.

Method Summary

Modifier and Type	Method and Description
private Location	alloc(int size) Allocate a new rowid with the indicated size.
private Location	allocNew(int size, long start) Allocates a new rowid.
(package private) void	delete(Location rowid) Deletes a record.
(package private) byte[]	fetch(Location rowid) Retrieves a record.
private void	free(Location id)
(package private) Location	insert(byte[] data, int start, int length) Inserts a new record.
(package private) Location	update(Location rowid, byte[] data, int start, int length) Updates an existing record.
private void	write(Location rowid, byte[] data, int start, int length) Writes out data to a rowid.

Methods inherited from class java.lang.Object

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

Field Detail

file

private RecordFile file

The file we're talking to and the associated page manager.

pageManager

private PageManager pageManager

The page manager

freePageManager

private FreePhysicalRowIdPageManager freePageManager

The FreePage manager

Constructor Detail

PhysicalRowIdManager

PhysicalRowIdManager(PageManager pageManager)
              throws java.io.IOException

Creates a new rowid manager using the indicated record file. and page manager.

Throws:

java.io.IOException - If we had an issue while creating the file

Method Detail

insert

Location insert(byte[] data,
                int start,
                int length)
         throws java.io.IOException

Inserts a new record. Returns the new physical rowid.

Throws:

java.io.IOException

update

Location update(Location rowid,
                byte[] data,
                int start,
                int length)
         throws java.io.IOException

Updates an existing record. Returns the possibly changed physical rowid.

Throws:

java.io.IOException

delete

void delete(Location rowid)
     throws java.io.IOException

Deletes a record.

Throws:

java.io.IOException

fetch

byte[] fetch(Location rowid)
      throws java.io.IOException

Retrieves a record.

Throws:

java.io.IOException

alloc

private Location alloc(int size)
                throws java.io.IOException

Allocate a new rowid with the indicated size.

Throws:

java.io.IOException

allocNew

private Location allocNew(int size,
                          long start)
                   throws java.io.IOException

Allocates a new rowid. The second parameter is there to allow for a recursive call - it indicates where the search should start.

Throws:

java.io.IOException

free

private void free(Location id)
           throws java.io.IOException

Throws:

java.io.IOException

write

private void write(Location rowid,
                   byte[] data,
                   int start,
                   int length)
            throws java.io.IOException

Writes out data to a rowid. Assumes that any resizing has been done.

Throws:

java.io.IOException