/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2014-2016 ForgeRock AS.
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*/
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package org.opends.server.backends.pluggable.spi;
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import java.io.Closeable;
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import net.jcip.annotations.ThreadSafe;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteString;
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/**
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* Allows to run an import. For performance reasons, imports are run without transactions.
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* <p>
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* Since import is multi threaded, implementations must be thread-safe.
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*/
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@ThreadSafe
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public interface Importer extends Closeable
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{
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/**
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* Clear the tree whose name is provided. Ensure that an empty tree with the given name exists. If the tree already
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* exists, all the data it contains will be deleted. If not, an empty tree will be created.
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*
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* @param treeName name of the tree to clear
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*/
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void clearTree(TreeName treeName);
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/**
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* Creates a record with the provided key and value in the tree identified by the provided name. At the end of this
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* method, the record is visible by {@link #read(TreeName, ByteSequence)} and {@link #openCursor(TreeName)} methods of
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* this instance. The record is guaranteed to be persisted only after {@link #close()}.
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*
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* @param treeName
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* the tree name
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* @param key
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* the new record's key
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* @param value
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* the new record's value
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*/
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void put(TreeName treeName, ByteSequence key, ByteSequence value);
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/**
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* Reads the record's value associated to the provided key, in the tree whose name is provided.
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*
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* @param treeName
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* the tree name
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* @param key
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* the record's key
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* @return the record's value, or {@code null} if none exists
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*/
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ByteString read(TreeName treeName, ByteSequence key);
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/**
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* Opens a cursor on the tree whose name is provided. Cursors are predictable only if there is no pending
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* {@link #put(TreeName, ByteSequence, ByteSequence)} operations. Indeed, once opened, cursors might not reflect
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* changes.
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*
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* @param treeName
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* the tree name
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* @return a new cursor
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*/
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SequentialCursor<ByteString, ByteString> openCursor(TreeName treeName);
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@Override
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void close();
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}
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