/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at legal-notices/CDDLv1_0.txt
* or http://forgerock.org/license/CDDLv1.0.html.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at legal-notices/CDDLv1_0.txt.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2014-2015 ForgeRock AS
*/
package org.opends.server.backends.pluggable.spi;
import java.io.Closeable;
import org.forgerock.opendj.ldap.ByteSequence;
import org.forgerock.opendj.ldap.ByteString;
/**
* Allows to run an import. For performance reasons, imports are run without transactions.
* <p>
* Since import is multi threaded, implementations must be thread-safe.
* <p>
*
* @ThreadSafe
*/
public interface Importer extends Closeable
{
/**
* Clear the tree whose name is provided. Ensure 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.
*
* @param treeName name of the tree to clear
*/
void clearTree(TreeName treeName);
/**
* 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 by {@link read(TreeName, ByteSequence)} and {@link openCursor(TreeName)} methods of
* this instance. The record is guaranteed to be persisted only after {@link #close()}.
*
* @param treeName
* the tree name
* @param key
* the new record's key
* @param value
* the new record's value
*/
void put(TreeName treeName, ByteSequence key, ByteSequence value);
/**
* Reads the record's value associated to the provided key, in the tree whose name is provided.
*
* @param treeName
* the tree name
* @param key
* the record's key
* @return the record's value, or {@code null} if none exists
*/
ByteString read(TreeName treeName, ByteSequence key);
/**
* Opens a cursor on the tree whose name is provided. Cursors are predictable only if there is no pending
* {@link put(TreeName, ByteSequence, ByteSequence)} operations. Indeed, once opened, cursors might not reflect
* changes.
*
* @param treeName
* the tree name
* @return a new cursor
*/
SequentialCursor<ByteString, ByteString> openCursor(TreeName treeName);
@Override
void close();
}