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Java Source Code / Java Documentation » Database DBMS » Ozone 1.1 » org.ozoneDB.DxLib

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.ozoneDB.DxLib .DxObject

org.ozoneDB.DxLib .DxAbstractCollection

org.ozoneDB.DxLib .DxAbstractMap

org.ozoneDB.DxLib .DxDiskHashMap

All known Subclasses:   org.ozoneDB.core.wizardStore .IDTable,
DxDiskHashMap
public class DxDiskHashMap extends DxAbstractMap (Code)

author:
   SMB
author:
   Medium.net
version:
   $Revision: 1.3 $Date: 2002/06/08 00:49:38 $

Field Summary
final public static String ROOT_TABLE_NAME

protected DxSet buffer

public int bufferAccesses

public int bufferHits

public int cacheAccesses

public int cacheHits

protected int maxBufferSize

final static long serialVersionUID

public int tableBitSize

protected File tableDirectory
     The directory where all tables reside.

Constructor Summary
public DxDiskHashMap(String _baseFileName, int _maxBufferSize, int _cacheBits, int _tableBitSize)


Method Summary
public synchronized boolean addForKey(Object obj, Object key)

public void cleanFiles()
     Delete all the files used by this hashtable.
public synchronized void clear()

public Object clone()

public synchronized void close()
     Close this hash map.
public boolean containsKey(Object key)

public int count()

public synchronized void deleteRequest(DxDiskSubTable subTable)
     The specified sub-table was deleted from the tree.
protected synchronized void elementDone(DxDiskHashCompatible obj)

public synchronized Object elementForKey(Object key)
     Gives the element for the specified key.
Note: This method is synchronized because the cache of subtables may change.
public File getFileForFilename(String filename)
     Computes a File object which represents the DxDiskSubTable file denoted by the given filename.
There are two formats for the given filename:

The long format is a pathname relative to the current working directory of the Java application which wrote the table referring the DxDiskSubTable in question. It may also be an absolute pathname.
public boolean isDirtyTable(DxDiskSubTable table)

public boolean isEmpty()

public DxIterator iterator()

public Object keyForElement(Object obj)

public DxKeyData newKeyData()

public DxDiskHashNodeBranch newNodeBranch()

public DxDiskHashNodeLeaf newNodeLeaf()

public synchronized File newSubTableFile()
     This method is synchronized because sub table filenames have to be unique.
public void printStatistics()

public synchronized void re_use()
     Reuse an existing table from disk.
protected synchronized void readRequest(DxDiskSubTable subTable)
     Eine sub-tabelle will nachladen.
public synchronized boolean remove(Object obj)

public synchronized Object removeForKey(Object key)

public DxDiskSubTable rootTable()

public void setReusable(boolean flag)

public synchronized void writeAllTables()


Field Detail
ROOT_TABLE_NAME
final public static String ROOT_TABLE_NAME(Code)

buffer
protected DxSet buffer(Code)

bufferAccesses
public int bufferAccesses(Code)

bufferHits
public int bufferHits(Code)

cacheAccesses
public int cacheAccesses(Code)

cacheHits
public int cacheHits(Code)

maxBufferSize
protected int maxBufferSize(Code)

serialVersionUID
final static long serialVersionUID(Code)

tableBitSize
public int tableBitSize(Code)

tableDirectory
protected File tableDirectory(Code)
The directory where all tables reside.

Constructor Detail
DxDiskHashMap
public DxDiskHashMap(String _baseFileName, int _maxBufferSize, int _cacheBits, int _tableBitSize)(Code)

Method Detail
addForKey
public synchronized boolean addForKey(Object obj, Object key)(Code)

cleanFiles
public void cleanFiles()(Code)
Delete all the files used by this hashtable.

clear
public synchronized void clear()(Code)

clone
public Object clone()(Code)

close
public synchronized void close() throws Exception(Code)
Close this hash map. Write all changed tables to the disk. Store also all information that are needed to re-initialize this object from the disk data.

containsKey
public boolean containsKey(Object key)(Code)

count
public int count()(Code)

deleteRequest
public synchronized void deleteRequest(DxDiskSubTable subTable)(Code)
The specified sub-table was deleted from the tree. So we have to delete it from the table buffer too.

elementDone
protected synchronized void elementDone(DxDiskHashCompatible obj)(Code)

elementForKey
public synchronized Object elementForKey(Object key)(Code)
Gives the element for the specified key.
Note: This method is synchronized because the cache of subtables may change.

getFileForFilename
public File getFileForFilename(String filename)(Code)
Computes a File object which represents the DxDiskSubTable file denoted by the given filename.
There are two formats for the given filename:

The long format is a pathname relative to the current working directory of the Java application which wrote the table referring the DxDiskSubTable in question. It may also be an absolute pathname. This format is error prone as it does not allow changing the working directory of Java applications or changing the location of the table files within the filesystem. That's why the short format is used now.

The short format is only the last pathname component of the pathname to the referred DxDiskSubTable file. The other pathname components (e.g. the directory where the DxDiskSubTable file resides) are determined by the directory where the root table resides. This is possible because als DxDiskSubTable files reside in the same directory as the root table file does.

For compatibility with old tables, the long format is broken up into pathname components and only the last pathname component is used then as a directory entry of the directory of the root table file.

isDirtyTable
public boolean isDirtyTable(DxDiskSubTable table)(Code)

isEmpty
public boolean isEmpty()(Code)

iterator
public DxIterator iterator()(Code)

keyForElement
public Object keyForElement(Object obj)(Code)

newKeyData
public DxKeyData newKeyData()(Code)

newNodeBranch
public DxDiskHashNodeBranch newNodeBranch()(Code)

newNodeLeaf
public DxDiskHashNodeLeaf newNodeLeaf()(Code)

newSubTableFile
public synchronized File newSubTableFile()(Code)
This method is synchronized because sub table filenames have to be unique.

printStatistics
public void printStatistics()(Code)

re_use
public synchronized void re_use() throws Exception(Code)
Reuse an existing table from disk. To do so a previously created table has to be correctly closed. Once a hash map has been re-used it has to closed before opening again.

readRequest
protected synchronized void readRequest(DxDiskSubTable subTable) throws Exception(Code)
Eine sub-tabelle will nachladen. Wenn der buffer voll ist, muss eine andere verworfen werden. Die "aelteste" table ist immer ein blatt, da die zeiten mmer beim rekursiven aufstieg gesetzt werden.

remove
public synchronized boolean remove(Object obj)(Code)

removeForKey
public synchronized Object removeForKey(Object key)(Code)

rootTable
public DxDiskSubTable rootTable()(Code)

setReusable
public void setReusable(boolean flag) throws IOException(Code)

writeAllTables
public synchronized void writeAllTables() throws Exception(Code)

Fields inherited from org.ozoneDB.DxLib.DxAbstractMap
final static long serialVersionUID(Code)(Java Doc)

Methods inherited from org.ozoneDB.DxLib.DxAbstractMap
public synchronized boolean add(Object obj)(Code)(Java Doc)
public synchronized boolean addAll(DxCollection coll)(Code)(Java Doc)
public Object buildKey(Object obj)(Code)(Java Doc)
public Object clone(DxMap newMap)(Code)(Java Doc)
public boolean containsKey(Object key)(Code)(Java Doc)
public DxSet elementSet()(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
public DxSet keySet()(Code)(Java Doc)
public synchronized void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code)(Java Doc)
public synchronized boolean removeAllKeys(DxCollection coll)(Code)(Java Doc)
public DxCollection valueClone()(Code)(Java Doc)
public void writeExternal(ObjectOutput out) throws IOException(Code)(Java Doc)

Fields inherited from org.ozoneDB.DxLib.DxAbstractCollection
final static long serialVersionUID(Code)(Java Doc)

Methods inherited from org.ozoneDB.DxLib.DxAbstractCollection
public synchronized boolean addAll(DxCollection coll)(Code)(Java Doc)
public synchronized boolean addAll(Object[] objs)(Code)(Java Doc)
public Object clone(DxCollection newInstance)(Code)(Java Doc)
public boolean contains(Object obj)(Code)(Java Doc)
public boolean containsAll(DxCollection coll)(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
public synchronized void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code)(Java Doc)
public synchronized boolean remove(Object obj)(Code)(Java Doc)
public synchronized boolean removeAll(DxCollection coll)(Code)(Java Doc)
public Object[] toArray()(Code)(Java Doc)
public DxCollection valueClone()(Code)(Java Doc)
public void writeExternal(ObjectOutput out) throws IOException(Code)(Java Doc)

Fields inherited from org.ozoneDB.DxLib.DxObject
final static long serialVersionUID(Code)(Java Doc)

Methods inherited from org.ozoneDB.DxLib.DxObject
public Object clone()(Code)(Java Doc)
public boolean isLess(DxCompatible obj)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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