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public interface DataHandler
A data handler contains a number of callback methods. The most important implementing class is a database.
| Method Summary | |
|---|---|
void |
checkPowerOff()
Check if the simulated power failure occurred. |
void |
checkWritingAllowed()
Check if writing is allowed. |
java.lang.String |
getDatabasePath()
Get the database path. |
java.lang.String |
getLobCompressionAlgorithm(int type)
Get the compression algorithm used for large objects. |
java.sql.Connection |
getLobConnection()
Get a database connection to be used for LOB access. |
SmallLRUCache<java.lang.String,java.lang.String[]> |
getLobFileListCache()
Get the lob file list cache if it is used. |
LobStorage |
getLobStorage()
Get the lob storage mechanism to use. |
java.lang.Object |
getLobSyncObject()
Get the synchronization object for lob operations. |
int |
getMaxLengthInplaceLob()
Get the maximum length of a in-place large object |
TempFileDeleter |
getTempFileDeleter()
Get the temp file deleter mechanism. |
FileStore |
openFile(java.lang.String name,
java.lang.String mode,
boolean mustExist)
Open a file at the given location. |
int |
readLob(long lobId,
long offset,
byte[] buff,
int off,
int length)
Read from a lob. |
| Method Detail |
|---|
java.lang.String getDatabasePath()
FileStore openFile(java.lang.String name,
java.lang.String mode,
boolean mustExist)
name - the file namemode - the modemustExist - whether the file must already exist
void checkPowerOff()
throws DbException
DbException - if the simulated power failure occurred
void checkWritingAllowed()
throws DbException
DbException - if it is not allowedint getMaxLengthInplaceLob()
java.lang.String getLobCompressionAlgorithm(int type)
type - the data type (CLOB or BLOB)
TempFileDeleter getTempFileDeleter()
java.lang.Object getLobSyncObject()
SmallLRUCache<java.lang.String,java.lang.String[]> getLobFileListCache()
LobStorage getLobStorage()
java.sql.Connection getLobConnection()
int readLob(long lobId,
long offset,
byte[] buff,
int off,
int length)
lobId - the loboffset - the offset within the lobbuff - the target bufferoff - the offset within the target bufferlength - the number of bytes to read
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