Interface Importer
-
- All Superinterfaces:
AutoCloseable
,Closeable
@ThreadSafe public interface Importer extends Closeable
Allows to run an import. For performance reasons, imports are run without transactions.Since import is multi threaded, implementations must be thread-safe.
-
-
Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
clearTree(TreeName treeName)
Clears the tree whose name is provided.void
close()
SequentialCursor<ByteString,ByteString>
openCursor(TreeName treeName)
Opens a cursor on the tree whose name is provided.void
put(TreeName treeName, ByteString key, ByteString value)
Creates a record with the provided key and value in the tree identified by the provided name.ByteString
read(TreeName treeName, ByteString key)
Reads the record's value associated to the provided key, in the tree whose name is provided.
-
-
-
Method Detail
-
clearTree
void clearTree(TreeName treeName)
Clears the tree whose name is provided. Ensures that an empty tree with the given name exists. If the tree already exists, all the data it contains will be deleted. If not, an empty tree will be created.- Parameters:
treeName
- name of the tree to clear
-
put
void put(TreeName treeName, ByteString key, ByteString value)
Creates a record with the provided key and value in the tree identified by the provided name. At the end of this method, the record is visible byread(TreeName, ByteString)
andopenCursor(TreeName)
methods of this instance. The record is guaranteed to be persisted only afterclose()
.- Parameters:
treeName
- the tree namekey
- the new record's keyvalue
- the new record's value
-
read
ByteString read(TreeName treeName, ByteString key)
Reads the record's value associated to the provided key, in the tree whose name is provided.- Parameters:
treeName
- the tree namekey
- the record's key- Returns:
- the record's value, or
null
if none exists
-
openCursor
SequentialCursor<ByteString,ByteString> openCursor(TreeName treeName)
Opens a cursor on the tree whose name is provided. Cursors are predictable only if there is no pendingput(TreeName, ByteString, ByteString)
operations. Indeed, once opened, cursors might not reflect changes.- Parameters:
treeName
- the tree name- Returns:
- a new cursor
-
close
void close()
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
-
-