/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying * information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import com.sleepycat.je.BtreeStats;
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import com.sleepycat.je.Cursor;
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import com.sleepycat.je.CursorConfig;
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import com.sleepycat.je.Database;
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import com.sleepycat.je.DatabaseConfig;
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import com.sleepycat.je.DatabaseEntry;
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import com.sleepycat.je.DatabaseException;
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import com.sleepycat.je.LockMode;
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import com.sleepycat.je.OperationStatus;
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import com.sleepycat.je.StatsConfig;
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import com.sleepycat.je.Transaction;
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import org.opends.server.types.DN;
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import org.opends.server.util.StaticUtils;
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/**
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* This class represents the DN database, or dn2id, which has one record
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* for each entry. The key is the normalized entry DN and the value
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* is the entry ID.
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*/
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public class DN2ID
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{
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/**
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* The database container.
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*/
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private Container container;
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/**
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* The JE database configuration.
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*/
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private DatabaseConfig dbConfig;
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/**
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* The name of the database within the container.
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*/
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private String name;
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/**
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* A cached per-thread JE database handle.
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*/
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private ThreadLocal<Database> threadLocalDatabase =
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new ThreadLocal<Database>();
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/**
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* Create a DN2ID instance for the DN database in a given container.
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*
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* @param container The container of the DN database.
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* @param dbConfig The JE database configuration which will be used to
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* open the database.
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* @param name The name of the DN database ("dn2id").
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*/
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public DN2ID(Container container, DatabaseConfig dbConfig, String name)
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{
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this.container = container;
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this.dbConfig = dbConfig;
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this.name = name;
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}
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/**
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* Open the DN database.
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*
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public void open() throws DatabaseException
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{
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getDatabase();
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}
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/**
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* Get a handle to the database. It returns a per-thread handle to avoid
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* any thread contention on the database handle. The container is
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* responsible for closing all handles.
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*
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* @return A database handle.
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*
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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private Database getDatabase() throws DatabaseException
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{
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Database database = threadLocalDatabase.get();
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if (database == null)
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{
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database = container.openDatabase(dbConfig, name);
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threadLocalDatabase.set(database);
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}
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return database;
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}
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/**
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* Create a DN database key from an entry DN.
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* @param dn The entry DN.
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* @return A DatabaseEntry containing the key.
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*/
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private static DatabaseEntry DNdata(DN dn)
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{
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byte[] normDN = StaticUtils.getBytes(dn.toNormalizedString());
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return new DatabaseEntry(normDN);
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}
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/**
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* Insert a new record into the DN database.
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* @param txn A JE database transaction to be used for the database operation,
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* or null if none.
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* @param dn The entry DN, which is the key to the record.
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* @param id The entry ID, which is the value of the record.
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* @return true if the record was inserted, false if a record with that key
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* already exists.
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* @throws DatabaseException If an error occurred while attempting to insert
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* the new record.
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*/
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public boolean insert(Transaction txn, DN dn, EntryID id)
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throws DatabaseException
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{
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DatabaseEntry key = DNdata(dn);
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DatabaseEntry data = id.getDatabaseEntry();
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OperationStatus status;
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status = Container.insert(getDatabase(), txn, key, data);
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if (status != OperationStatus.SUCCESS)
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{
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return false;
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}
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return true;
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}
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/**
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* Write a record to the DN database. If a record with the given key already
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* exists, the record will be replaced, otherwise a new record will be
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* inserted.
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* @param txn A JE database transaction to be used for the database operation,
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* or null if none.
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* @param dn The entry DN, which is the key to the record.
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* @param id The entry ID, which is the value of the record.
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* @return true if the record was written, false if it was not written.
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* @throws DatabaseException If an error occurred while attempting to write
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* the record.
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*/
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public boolean put(Transaction txn, DN dn, EntryID id)
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throws DatabaseException
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{
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DatabaseEntry key = DNdata(dn);
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DatabaseEntry data = id.getDatabaseEntry();
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OperationStatus status;
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status = Container.put(getDatabase(), txn, key, data);
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if (status != OperationStatus.SUCCESS)
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{
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return false;
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}
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return true;
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}
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/**
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* Write a record to the DN database, where the key and value are already
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* formatted.
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* @param txn A JE database transaction to be used for the database operation,
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* or null if none.
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* @param key A DatabaseEntry containing the record key.
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* @param data A DatabaseEntry containing the record value.
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* @return true if the record was written, false if it was not written.
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* @throws DatabaseException If an error occurred while attempting to write
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* the record.
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*/
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public boolean putRaw(Transaction txn, DatabaseEntry key, DatabaseEntry data)
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throws DatabaseException
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{
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OperationStatus status;
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status = Container.put(getDatabase(), txn, key, data);
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if (status != OperationStatus.SUCCESS)
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{
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return false;
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}
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return true;
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}
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/**
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* Remove a record from the DN database.
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* @param txn A JE database transaction to be used for the database operation,
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* or null if none.
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* @param dn The entry DN, which is the key to the record.
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* @return true if the record was removed, false if it was not removed.
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* @throws DatabaseException If an error occurred while attempting to remove
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* the record.
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*/
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public boolean remove(Transaction txn, DN dn)
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throws DatabaseException
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{
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DatabaseEntry key = DNdata(dn);
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OperationStatus status = Container.delete(getDatabase(), txn, key);
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if (status != OperationStatus.SUCCESS)
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{
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return false;
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}
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return true;
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}
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/**
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* Fetch the entry ID for a given DN.
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* @param txn A JE database transaction to be used for the database read, or
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* null if none is required.
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* @param dn The DN for which the entry ID is desired.
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* @return The entry ID, or null if the given DN is not in the DN database.
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public EntryID get(Transaction txn, DN dn)
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throws DatabaseException
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{
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DatabaseEntry key = DNdata(dn);
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DatabaseEntry data = new DatabaseEntry();
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OperationStatus status;
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status = Container.read(getDatabase(), txn, key, data, LockMode.DEFAULT);
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if (status != OperationStatus.SUCCESS)
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{
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return null;
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}
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return new EntryID(data);
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}
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/**
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* Open a JE cursor on the DN database.
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* @param txn A JE database transaction to be used by the cursor,
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* or null if none.
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* @param cursorConfig The JE cursor configuration.
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* @return A JE cursor.
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* @throws DatabaseException If an error occurs while attempting to open
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* the cursor.
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*/
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public Cursor openCursor(Transaction txn, CursorConfig cursorConfig)
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throws DatabaseException
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{
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return getDatabase().openCursor(txn, cursorConfig);
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}
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/**
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* Compute the count of the number of records stored. This can be a
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* long running computation as it must walk the entire btree.
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*
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* @return The number of records stored.
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*
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* @throws DatabaseException If an error occurs in the JE database.
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*/
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public long computeRecordCount() throws DatabaseException
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{
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BtreeStats stats = (BtreeStats)getDatabase().getStats(new StatsConfig());
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return stats.getLeafNodeCount();
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}
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}
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