Package org.h2.store
Interface DataHandler
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- All Known Implementing Classes:
Database
,Recover
,SessionRemote
public interface DataHandler
A data handler contains a number of callback methods, mostly related to CLOB and BLOB handling. The most important implementing class is a database.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
checkPowerOff()
Check if the simulated power failure occurred.void
checkWritingAllowed()
Check if writing is allowed.CompareMode
getCompareMode()
Return compare mode.java.lang.String
getDatabasePath()
Get the database path.SmallLRUCache<java.lang.String,java.lang.String[]>
getLobFileListCache()
Get the lob file list cache if it is used.LobStorageInterface
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 objectTempFileDeleter
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, byte[] hmac, long offset, byte[] buff, int off, int length)
Read from a lob.
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Method Detail
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getDatabasePath
java.lang.String getDatabasePath()
Get the database path.- Returns:
- the database path
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openFile
FileStore openFile(java.lang.String name, java.lang.String mode, boolean mustExist)
Open a file at the given location.- Parameters:
name
- the file namemode
- the modemustExist
- whether the file must already exist- Returns:
- the file
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checkPowerOff
void checkPowerOff() throws DbException
Check if the simulated power failure occurred. This call will decrement the countdown.- Throws:
DbException
- if the simulated power failure occurred
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checkWritingAllowed
void checkWritingAllowed() throws DbException
Check if writing is allowed.- Throws:
DbException
- if it is not allowed
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getMaxLengthInplaceLob
int getMaxLengthInplaceLob()
Get the maximum length of a in-place large object- Returns:
- the maximum size
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getTempFileDeleter
TempFileDeleter getTempFileDeleter()
Get the temp file deleter mechanism.- Returns:
- the temp file deleter
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getLobSyncObject
java.lang.Object getLobSyncObject()
Get the synchronization object for lob operations.- Returns:
- the synchronization object
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getLobFileListCache
SmallLRUCache<java.lang.String,java.lang.String[]> getLobFileListCache()
Get the lob file list cache if it is used.- Returns:
- the cache or null
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getLobStorage
LobStorageInterface getLobStorage()
Get the lob storage mechanism to use.- Returns:
- the lob storage mechanism
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readLob
int readLob(long lobId, byte[] hmac, long offset, byte[] buff, int off, int length)
Read from a lob.- Parameters:
lobId
- the lob idhmac
- the message authentication codeoffset
- the offset within the lobbuff
- the target bufferoff
- the offset within the target bufferlength
- the number of bytes to read- Returns:
- the number of bytes read
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getCompareMode
CompareMode getCompareMode()
Return compare mode.- Returns:
- Compare mode.
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