org.apache.lucene.store.wrapper
Class SyncMemoryMirrorDirectoryWrapper

java.lang.Object
  org.apache.lucene.store.Directory
      org.apache.lucene.store.wrapper.SyncMemoryMirrorDirectoryWrapper

public class SyncMemoryMirrorDirectoryWrapper
extends Directory

Wraps a Lucene Directory with an in memory directory which mirrors it synchronously.

The original directory is read into memory when this wrapper is constructed. All read realted operations are performed against the in memory directory. All write related operations are performed both against the in memeory directory and the original directory. Locking is performed using the in memory directory.

NOTE: This wrapper will only work in cases when either the index is read only (i.e. only search operations are performed against it), or when there is a single instance which updates the directory.

Author:

kimchy

Nested Class Summary

static class

SyncMemoryMirrorDirectoryWrapper.SyncMemoryMirrorIndexOutput

Field Summary

Fields inherited from class org.apache.lucene.store.Directory

lockFactory

Constructor Summary

SyncMemoryMirrorDirectoryWrapper(Directory dir)

Method Summary

void	close()
IndexOutput	createOutput(String name)
void	deleteFile(String name)
boolean	fileExists(String name)
long	fileLength(String name)
long	fileModified(String name)
String[]	list()
Lock	makeLock(String name)
IndexInput	openInput(String name)
void	renameFile(String from, String to)
void	touchFile(String name)

Methods inherited from class org.apache.lucene.store.Directory

clearLock, copy, ensureOpen, getLockFactory, getLockID, openInput, setLockFactory, sync

Methods inherited from class java.lang.Object

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

Constructor Detail

SyncMemoryMirrorDirectoryWrapper

public SyncMemoryMirrorDirectoryWrapper(Directory dir)
                                 throws IOException

Throws:

IOException

Method Detail

deleteFile

public void deleteFile(String name)
                throws IOException

Specified by:

deleteFile in class Directory

Throws:

IOException

fileExists

public boolean fileExists(String name)
                   throws IOException

Specified by:

fileExists in class Directory

Throws:

IOException

fileLength

public long fileLength(String name)
                throws IOException

Specified by:

fileLength in class Directory

Throws:

IOException

fileModified

public long fileModified(String name)
                  throws IOException

Specified by:

fileModified in class Directory

Throws:

IOException

list

public String[] list()
              throws IOException

Specified by:

list in class Directory

Throws:

IOException

renameFile

public void renameFile(String from,
                       String to)
                throws IOException

Specified by:

renameFile in class Directory

Throws:

IOException

touchFile

public void touchFile(String name)
               throws IOException

Specified by:

touchFile in class Directory

Throws:

IOException

makeLock

public Lock makeLock(String name)

Overrides:

makeLock in class Directory

close

public void close()
           throws IOException

Specified by:

close in class Directory

Throws:

IOException

openInput

public IndexInput openInput(String name)
                     throws IOException

Specified by:

openInput in class Directory

Throws:

IOException

createOutput

public IndexOutput createOutput(String name)
                         throws IOException

Specified by:

createOutput in class Directory

Throws:

IOException