Package org.apache.iotdb.db.metadata.idtable

Class AppendOnlyDiskSchemaManager

java.lang.Object

org.apache.iotdb.db.metadata.idtable.AppendOnlyDiskSchemaManager

All Implemented Interfaces:

IDiskSchemaManager

public class AppendOnlyDiskSchemaManager
extends java.lang.Object
implements IDiskSchemaManager

store id table schema in append only file

Constructor Summary

Constructors

Constructor	Description
AppendOnlyDiskSchemaManager(java.io.File dir)

Method Summary

Modifier and Type	Method	Description
void	close()	close file and free resource
void	deleteDiskSchemaEntryByOffset(long offset)	delete DiskSchemaEntry on disk
java.util.Collection<DiskSchemaEntry>	getAllSchemaEntry()	get all disk schema entries from file
java.util.List<DiskSchemaEntry>	getDiskSchemaEntriesByOffset(java.util.List<java.lang.Long> offsets)	get DiskSchemaEntries from disk file
void	recover(IDTable idTable)	recover id table from log file
long	serialize(DiskSchemaEntry schemaEntry)	serialize a disk schema entry

Methods inherited from class java.lang.Object

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

Constructor Detail

AppendOnlyDiskSchemaManager

public AppendOnlyDiskSchemaManager(java.io.File dir)

Method Detail

serialize

public long serialize(DiskSchemaEntry schemaEntry)

Description copied from interface: IDiskSchemaManager

serialize a disk schema entry

Specified by:

serialize in interface IDiskSchemaManager

Parameters:

schemaEntry - disk schema entry

Returns:

disk position of that entry

recover

public void recover(IDTable idTable)

Description copied from interface: IDiskSchemaManager

recover id table from log file

Specified by:

recover in interface IDiskSchemaManager

Parameters:

idTable - id table need to be recovered

getAllSchemaEntry

public java.util.Collection<DiskSchemaEntry> getAllSchemaEntry()
                                                        throws java.io.IOException

Description copied from interface: IDiskSchemaManager

get all disk schema entries from file

Specified by:

getAllSchemaEntry in interface IDiskSchemaManager

Returns:

collection of all disk schema entires

Throws:

java.io.IOException

getDiskSchemaEntriesByOffset

public java.util.List<DiskSchemaEntry> getDiskSchemaEntriesByOffset(java.util.List<java.lang.Long> offsets)

get DiskSchemaEntries from disk file

Specified by:

getDiskSchemaEntriesByOffset in interface IDiskSchemaManager

Parameters:

offsets - the offset of each record on the disk file

Returns:

DiskSchemaEntries

deleteDiskSchemaEntryByOffset

public void deleteDiskSchemaEntryByOffset(long offset)
                                   throws org.apache.iotdb.commons.exception.MetadataException

delete DiskSchemaEntry on disk

Specified by:

deleteDiskSchemaEntryByOffset in interface IDiskSchemaManager

Parameters:

offset - the offset of a record on the disk file

Throws:

org.apache.iotdb.commons.exception.MetadataException

close

public void close()
           throws java.io.IOException

Description copied from interface: IDiskSchemaManager

close file and free resource

Specified by:

close in interface IDiskSchemaManager

Throws:

java.io.IOException