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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.sql.file 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   com.quadcap.sql.file.BlockStore

All known Subclasses:   com.quadcap.sql.file.MemoryBlockStore,  com.quadcap.sql.file.EncryptedBlockStore,  com.quadcap.sql.file.NullStore,
BlockStore
public class BlockStore (Code)
Below the cache, this class handles the actual I/O to the underlying file. Block write operations are logged by this class.
author:
   Stan Bailes


Field Summary
 intblockSize
    
 booleanencrypted
    
 Filefile
    
 FileRandomAccessfra
    
 booleanisTempFile
    
 Objectlock
    
 Loglog
    
 BitSetmodified
    
public static  intreadCount
    
 booleanreadOnly
    
public static  intwriteCount
    

Constructor Summary
public  BlockStore()
     Create a new BlockStore object using the specified file and blocksize.

Method Summary
public  intblockSize()
     Return the block size of this store.
public  voidclearModified()
    
public  voidclose()
    
public  voidflush()
    
public  FilegetFile()
    
public  LoggetLog()
    
public  StringgetName()
    
public  voidinit(File file, String mode, int blockSize, Object lock)
    
public  booleanisEncrypted()
    
final protected  byte[]newHeader(int blockSize, long lastBlock)
    
public  voidread(long blockNum, byte[] buf)
     Read a block into a buffer.
public  voidread(long blockNum, byte[] buf, int off)
    
public  voidrestore(long blockNum, byte[] buf, int off)
    
public static  Stringrw()
    
public  voidsetKey(com.quadcap.crypto.SymmetricKey key)
    
public  voidsetLength(long length)
    
public  voidsetLog(Log log)
     Specify the log used for recovery operations.
public  StringtoString()
    
public  voidwrite(long blockNum, byte[] buf)
     Write a block from a buffer into the file.

Field Detail
blockSize
int blockSize(Code)



encrypted
boolean encrypted(Code)



file
File file(Code)



fra
FileRandomAccess fra(Code)



isTempFile
boolean isTempFile(Code)



lock
Object lock(Code)



log
Log log(Code)



modified
BitSet modified(Code)



readCount
public static int readCount(Code)



readOnly
boolean readOnly(Code)



writeCount
public static int writeCount(Code)




Constructor Detail
BlockStore
public BlockStore()(Code)
Create a new BlockStore object using the specified file and blocksize.
Parameters:
  file - the underlying file.
Parameters:
  mode - "r" for readonly access, otherwise "rw"
Parameters:
  blocksize - the block size to use when creating the file.
Parameters:
  the - synchronization object




Method Detail
blockSize
public int blockSize()(Code)
Return the block size of this store.



clearModified
public void clearModified() throws IOException(Code)



close
public void close() throws IOException(Code)



flush
public void flush() throws IOException(Code)



getFile
public File getFile()(Code)
Return the underlying file



getLog
public Log getLog()(Code)
Return the logger



getName
public String getName()(Code)



init
public void init(File file, String mode, int blockSize, Object lock) throws IOException(Code)



isEncrypted
public boolean isEncrypted()(Code)



newHeader
final protected byte[] newHeader(int blockSize, long lastBlock)(Code)



read
public void read(long blockNum, byte[] buf) throws IOException(Code)
Read a block into a buffer. If the specified block is beyond the current end of file, then grow the file
Parameters:
  blockNum - the number of the block to read.
Parameters:
  buf - the buffer into which the data is read.



read
public void read(long blockNum, byte[] buf, int off) throws IOException(Code)



restore
public void restore(long blockNum, byte[] buf, int off) throws IOException(Code)
Restore a block image



rw
public static String rw()(Code)



setKey
public void setKey(com.quadcap.crypto.SymmetricKey key) throws IOException(Code)



setLength
public void setLength(long length) throws IOException(Code)



setLog
public void setLog(Log log)(Code)
Specify the log used for recovery operations.



toString
public String toString()(Code)



write
public void write(long blockNum, byte[] buf) throws IOException(Code)
Write a block from a buffer into the file.
Parameters:
  blockNum - the number of the block to write.
Parameters:
  buf - the buffer from which the data is written.
exception:
  IOException - if an I/O error occurs.



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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