com.sun.electric.database.geometry.btree
Class CachingPageStorage

java.lang.Object
  com.sun.electric.database.geometry.btree.PageStorage
      com.sun.electric.database.geometry.btree.CachingPageStorage

Direct Known Subclasses:

CachingPageStorageWrapper, MemoryPageStorage

public abstract class CachingPageStorage
extends PageStorage

API for a PageStorage with some sort of cache; the CachingPageStorage.CachedPage class provides an interface for interacting with the cache.

Nested Class Summary

class

CachingPageStorage.CachedPage A page which is currently in the cache; pages can be dirty or clean.

Constructor Summary

CachingPageStorage(int pageSize)

Method Summary

abstract CachingPageStorage.CachedPage	getPage(int pageid, boolean readBytes) Creates space in the cache for pageid, but only actually reads the bytes if readBytes is true; if the page was not already in the cache and readBytes is false, subsequent calls to setDirty()/flush() will overwrite data previously on the page.
abstract void	writePage(int pageid, byte[] buf, int ofs) Write a page through the cache to nonvolatile storage

Methods inherited from class com.sun.electric.database.geometry.btree.PageStorage

close, createPage, fsync, fsync, getNumPages, getPageSize, readPage

Methods inherited from class java.lang.Object

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

Constructor Detail

CachingPageStorage

public CachingPageStorage(int pageSize)

Method Detail

getPage

public abstract CachingPageStorage.CachedPage getPage(int pageid,
                                                      boolean readBytes)

Creates space in the cache for pageid, but only actually reads the bytes if readBytes is true; if the page was not already in the cache and readBytes is false, subsequent calls to setDirty()/flush() will overwrite data previously on the page.

writePage

public abstract void writePage(int pageid,
                               byte[] buf,
                               int ofs)

Write a page through the cache to nonvolatile storage

Specified by:

writePage in class PageStorage