org.apache.derby.impl.io

Class DirStorageFactory4

java.lang.Object

org.apache.derby.impl.io.BaseStorageFactory

org.apache.derby.impl.io.DirStorageFactory

org.apache.derby.impl.io.DirStorageFactory4

All Implemented Interfaces:

StorageFactory, WritableStorageFactory

public class DirStorageFactory4
extends DirStorageFactory

This class implements the WritableStorageFactory interface using features found in Java 1.4 but not in earlier versions of Java.

Field Summary

Fields inherited from class org.apache.derby.impl.io.BaseStorageFactory

canonicalName, dataDirectory, home, separatedDataDirectory, tempDir, tempDirPath, uniqueName

Fields inherited from interface org.apache.derby.io.StorageFactory

VERSION_NUMBER

Constructor Summary

Constructors

Constructor and Description
DirStorageFactory4() Most of the initialization is done in the init method.

Method Summary

Methods

Modifier and Type	Method and Description
(package private) StorageFile	newPersistentFile(StorageFile directoryName, java.lang.String fileName) Construct a persistent StorageFile from a directory and path name.
(package private) StorageFile	newPersistentFile(java.lang.String path) Construct a persistent StorageFile from a path name.
(package private) StorageFile	newPersistentFile(java.lang.String directoryName, java.lang.String fileName) Construct a persistent StorageFile from a directory and path name.
boolean	supportsWriteSync() This method tests whether the "rws" and "rwd" modes are implemented.

Methods inherited from class org.apache.derby.impl.io.DirStorageFactory

doInit, isReadOnlyDatabase, newStorageFile, newStorageFile, newStorageFile, supportsRandomAccess, sync

Methods inherited from class org.apache.derby.impl.io.BaseStorageFactory

createTempDir, createTemporaryFile, getCanonicalName, getSeparator, getStorageFactoryVersion, getTempDir, init, isFast, setCanonicalName, shutdown

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.derby.io.StorageFactory

createTemporaryFile, getCanonicalName, getSeparator, getStorageFactoryVersion, getTempDir, init, isFast, setCanonicalName, shutdown

Constructor Detail

DirStorageFactory4

public DirStorageFactory4()

Most of the initialization is done in the init method.

Method Detail

newPersistentFile

StorageFile newPersistentFile(java.lang.String path)

Construct a persistent StorageFile from a path name.

Overrides:

newPersistentFile in class DirStorageFactory

Parameters:

path - The path name of the file. Guaranteed not to be in the temporary file directory. If null then the database directory should be returned.

Returns:

A corresponding StorageFile object

newPersistentFile

StorageFile newPersistentFile(java.lang.String directoryName,
                            java.lang.String fileName)

Construct a persistent StorageFile from a directory and path name.

Overrides:

newPersistentFile in class DirStorageFactory

Parameters:

directoryName - The path name of the directory. Guaranteed not to be in the temporary file directory. Guaranteed not to be null

fileName - The name of the file within the directory. Guaranteed not to be null.

Returns:

A corresponding StorageFile object

newPersistentFile

StorageFile newPersistentFile(StorageFile directoryName,
                            java.lang.String fileName)

Construct a persistent StorageFile from a directory and path name.

Overrides:

newPersistentFile in class DirStorageFactory

Parameters:

directoryName - The path name of the directory. Guaranteed not to be to be null. Guaranteed to be created by a call to one of the newPersistentFile methods.

fileName - The name of the file within the directory. Guaranteed not to be null.

Returns:

A corresponding StorageFile object

supportsWriteSync

public boolean supportsWriteSync()

This method tests whether the "rws" and "rwd" modes are implemented. If the "rws" and "rwd" modes are supported then the database engine will conclude that the write methods of "rws"/"rwd" mode StorageRandomAccessFiles are slow but the sync method is fast and optimize accordingly.

Specified by:

supportsWriteSync in interface WritableStorageFactory

Overrides:

supportsWriteSync in class DirStorageFactory

Returns:

true if an StIRandomAccess file opened with "rws" or "rwd" modes immediately writes data to the underlying storage, false if not.