Package org.iq80.leveldb

Interface DB

All Superinterfaces:

AutoCloseable, Closeable, Iterable<Map.Entry<byte[],byte[]>>

All Known Implementing Classes:

DbImpl

public interface DB
extends Iterable<Map.Entry<byte[],byte[]>>, Closeable

Method Summary

Modifier and Type	Method	Description
void	compactRange(byte[] begin, byte[] end)	Force a compaction of the specified key range.
WriteBatch	createWriteBatch()
void	delete(byte[] key)
Snapshot	delete(byte[] key, WriteOptions options)
byte[]	get(byte[] key)
byte[]	get(byte[] key, ReadOptions options)
long[]	getApproximateSizes(Range... ranges)
String	getProperty(String name)
Snapshot	getSnapshot()
DBIterator	iterator()
DBIterator	iterator(ReadOptions options)
void	put(byte[] key, byte[] value)
Snapshot	put(byte[] key, byte[] value, WriteOptions options)
void	resumeCompactions()	Resumes the background compaction threads.
void	suspendCompactions()	Suspends any background compaction threads.
void	write(WriteBatch updates)
Snapshot	write(WriteBatch updates, WriteOptions options)

Methods inherited from interface java.io.Closeable

close

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Method Details

get

byte[] get(byte[] key)
    throws DBException

Throws:

DBException

get

byte[] get(byte[] key,
 ReadOptions options)
    throws DBException

Throws:

DBException

iterator

DBIterator iterator()

Specified by:

iterator in interface Iterable<Map.Entry<byte[],byte[]>>

iterator

DBIterator iterator(ReadOptions options)

put

void put(byte[] key,
 byte[] value)
  throws DBException

Throws:

DBException

delete

void delete(byte[] key)
     throws DBException

Throws:

DBException

write

void write(WriteBatch updates)
    throws DBException

Throws:

DBException

createWriteBatch

WriteBatch createWriteBatch()

put

Snapshot put(byte[] key,
 byte[] value,
 WriteOptions options)
      throws DBException

Returns:

null if options.isSnapshot()==false otherwise returns a snapshot of the DB after this operation.

Throws:

DBException

delete

Snapshot delete(byte[] key,
 WriteOptions options)
         throws DBException

Returns:

null if options.isSnapshot()==false otherwise returns a snapshot of the DB after this operation.

Throws:

DBException

write

Snapshot write(WriteBatch updates,
 WriteOptions options)
        throws DBException

Returns:

null if options.isSnapshot()==false otherwise returns a snapshot of the DB after this operation.

Throws:

DBException

getSnapshot

Snapshot getSnapshot()

getApproximateSizes

long[] getApproximateSizes(Range... ranges)

getProperty

String getProperty(String name)

suspendCompactions

void suspendCompactions()
                 throws InterruptedException

Suspends any background compaction threads. This methods returns once the background compactions are suspended.

Throws:

InterruptedException

resumeCompactions

void resumeCompactions()

Resumes the background compaction threads.

compactRange

void compactRange(byte[] begin,
 byte[] end)
           throws DBException

Force a compaction of the specified key range.

Parameters:

begin - if null then compaction start from the first key

end - if null then compaction ends at the last key

Throws:

DBException