/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.core.partition.impl.btree.jdbm;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import jdbm.RecordManager;
import jdbm.helper.MRU;
import jdbm.recman.BaseRecordManager;
import jdbm.recman.CacheRecordManager;
import org.apache.directory.server.constants.ApacheSchemaConstants;
import org.apache.directory.server.core.partition.Partition;
import org.apache.directory.server.core.partition.impl.btree.AbstractBTreePartition;
import org.apache.directory.server.i18n.I18n;
import org.apache.directory.server.xdbm.Index;
import org.apache.directory.server.xdbm.search.impl.CursorBuilder;
import org.apache.directory.server.xdbm.search.impl.DefaultOptimizer;
import org.apache.directory.server.xdbm.search.impl.DefaultSearchEngine;
import org.apache.directory.server.xdbm.search.impl.EvaluatorBuilder;
import org.apache.directory.server.xdbm.search.impl.NoOpOptimizer;
import org.apache.directory.shared.ldap.model.cursor.Cursor;
import org.apache.directory.shared.ldap.model.cursor.Tuple;
import org.apache.directory.shared.ldap.model.entry.Attribute;
import org.apache.directory.shared.ldap.model.entry.Entry;
import org.apache.directory.shared.ldap.model.entry.Value;
import org.apache.directory.shared.ldap.model.schema.AttributeType;
import org.apache.directory.shared.ldap.model.schema.SchemaManager;
import org.apache.directory.shared.util.exception.MultiException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A {@link Partition} that stores entries in
* <a href="http://jdbm.sourceforge.net/">JDBM</a> database.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class JdbmPartition extends AbstractBTreePartition<Long>
{
/** static logger */
private static final Logger LOG = LoggerFactory.getLogger( JdbmPartition.class );
private static final String JDBM_DB_FILE_EXTN = ".db";
private static final FilenameFilter DB_FILTER = new FilenameFilter()
{
public boolean accept( File dir, String name )
{
// really important to filter master.db and master.lg files
return ( name.endsWith( JDBM_DB_FILE_EXTN ) && !name.startsWith( "master." ) );
}
};
/** the JDBM record manager used by this database */
private RecordManager recMan;
/**
* Creates a store based on JDBM B+Trees.
*/
public JdbmPartition( SchemaManager schemaManager )
{
super( schemaManager );
// Initialize the cache size
if ( cacheSize < 0 )
{
cacheSize = DEFAULT_CACHE_SIZE;
LOG.debug( "Using the default entry cache size of {} for {} partition", cacheSize, id );
}
else
{
LOG.debug( "Using the custom configured cache size of {} for {} partition", cacheSize, id );
}
}
protected void doInit() throws Exception
{
if ( !initialized )
{
// setup optimizer and registries for parent
if ( !optimizerEnabled )
{
optimizer = new NoOpOptimizer();
}
else
{
optimizer = new DefaultOptimizer<Entry, Long>( this );
}
EvaluatorBuilder<Long> evaluatorBuilder = new EvaluatorBuilder<Long>( this, schemaManager );
CursorBuilder<Long> cursorBuilder = new CursorBuilder<Long>( this, evaluatorBuilder );
searchEngine = new DefaultSearchEngine<Long>( this, cursorBuilder, evaluatorBuilder, optimizer );
// Create the underlying directories (only if needed)
File partitionDir = new File( getPartitionPath() );
partitionDir.mkdirs();
// Initialize the indexes
super.doInit();
// First, check if the file storing the data exists
String path = partitionDir.getPath() + File.separator + "master";
BaseRecordManager baseRecordManager = new BaseRecordManager( path );
baseRecordManager.disableTransactions();
if ( cacheSize < 0 )
{
cacheSize = DEFAULT_CACHE_SIZE;
LOG.debug( "Using the default entry cache size of {} for {} partition", cacheSize, id );
}
else
{
LOG.debug( "Using the custom configured cache size of {} for {} partition", cacheSize, id );
}
// Now, create the entry cache for this partition
recMan = new CacheRecordManager( baseRecordManager, new MRU( cacheSize ) );
// Create the master table (the table containing all the entries)
master = new JdbmMasterTable<Entry>( recMan, schemaManager );
// get all index db files first
File[] allIndexDbFiles = partitionDir.listFiles( DB_FILTER );
// get the names of the db files also
List<String> indexDbFileNameList = Arrays.asList( partitionDir.list( DB_FILTER ) );
// then add all index objects to a list
List<String> allIndices = new ArrayList<String>();
for( Index<?, Entry, Long> index : systemIndices.values() )
{
allIndices.add( index.getAttribute().getOid() );
}
// this loop is used for two purposes
// one for collecting all user indices
// two for finding a new index to be built
// just to avoid another iteration for determining which is the new index
for( Index<?, Entry, Long> index : userIndices.values() )
{
allIndices.add( index.getAttributeId() );
// take the part after removing .db from the
String name = index.getAttributeId() + JDBM_DB_FILE_EXTN;
// if the name doesn't exist in the list of index DB files
// this is a new index and we need to build it
if ( !indexDbFileNameList.contains( name ) )
{
buildUserIndex( index );
}
}
deleteUnusedIndexFiles( allIndices, allIndexDbFiles );
// We are done !
initialized = true;
}
}
/**
* {@inheritDoc}}
*/
public Long getDefaultId()
{
return 1L;
}
/**
* {@inheritDoc}
*/
public Long getRootId()
{
return 0L;
}
/**
* This method is called when the synch thread is waking up, to write
* the modified data.
*
* @throws Exception on failures to sync database files to disk
*/
public synchronized void sync() throws Exception
{
if ( !initialized )
{
return;
}
// Sync all system indices
for ( Index<?, Entry, Long> idx : systemIndices.values() )
{
idx.sync();
}
// Sync all user defined userIndices
for ( Index<?, Entry, Long> idx : userIndices.values() )
{
idx.sync();
}
( ( JdbmMasterTable<Entry> ) master ).sync();
recMan.commit();
}
/**
* builds a user defined index on a attribute by browsing all the entries present in master db
*
* @param userIdx then user defined index
* @throws Exception in case of any problems while building the index
*/
private void buildUserIndex( Index userIdx ) throws Exception
{
AttributeType atType = userIdx.getAttribute();
LOG.info( "building the index for attribute type {}", atType );
Cursor<Tuple<Long,Entry>> cursor = master.cursor();
cursor.beforeFirst();
String attributeOid = userIdx.getAttribute().getOid();
while ( cursor.next() )
{
Tuple<Long,Entry> tuple = cursor.get();
Long id = tuple.getKey();
Entry entry = tuple.getValue();
Attribute entryAttr = entry.get( atType );
if ( entryAttr != null )
{
for ( Value<?> value : entryAttr )
{
userIdx.add( value.getValue(), id );
}
// Adds only those attributes that are indexed
presenceIdx.add( attributeOid, id );
}
}
cursor.close();
}
/**
* removes any unused/removed attribute index files present under the partition's
* working directory
*/
private void deleteUnusedIndexFiles( List<String> allIndices, File[] dbFiles )
{
for ( File file : dbFiles )
{
String name = file.getName();
// take the part after removing .db from the
name = name.substring( 0, name.lastIndexOf( JDBM_DB_FILE_EXTN ) );
// remove the file if not found in the list of names of indices
if( !allIndices.contains( name ) )
{
boolean deleted = file.delete();
if( deleted )
{
LOG.info( "Deleted unused index file {}", file.getAbsolutePath() );
try
{
String atName = schemaManager.lookupAttributeTypeRegistry( name ).getName();
File txtFile = new File( file.getParent(), name + "-" + atName + ".txt" );
deleted = txtFile.delete();
if( !deleted )
{
LOG.info( "couldn't delete the index name helper file {}", txtFile );
}
}
catch( Exception e )
{
LOG.warn( "couldn't find the attribute's name with oid {}", name );
LOG.warn( "", e );
}
}
else
{
LOG.warn( "Failed to delete unused index file {}", file.getAbsolutePath() );
}
}
}
}
/**
* {@inheritDoc}
*/
protected Index<?, Entry, Long> convertAndInit( Index<?, Entry, Long> index ) throws Exception
{
JdbmIndex<?, Entry> jdbmIndex;
if ( index.getAttributeId().equals( ApacheSchemaConstants.APACHE_RDN_AT_OID ) )
{
jdbmIndex = new JdbmRdnIndex();
jdbmIndex.setAttributeId( ApacheSchemaConstants.APACHE_RDN_AT_OID );
jdbmIndex.setCacheSize( index.getCacheSize() );
jdbmIndex.setNumDupLimit( JdbmIndex.DEFAULT_DUPLICATE_LIMIT );
jdbmIndex.setWkDirPath( index.getWkDirPath() );
}
else if ( index instanceof JdbmIndex<?, ?> )
{
jdbmIndex = ( JdbmIndex<?, Entry> ) index;
if ( jdbmIndex.getWkDirPath() == null )
{
jdbmIndex.setWkDirPath( partitionPath );
}
}
else
{
LOG.debug( "Supplied index {} is not a JdbmIndex. "
+ "Will create new JdbmIndex using copied configuration parameters.", index );
jdbmIndex = new JdbmIndex( index.getAttributeId() );
jdbmIndex.setCacheSize( index.getCacheSize() );
jdbmIndex.setNumDupLimit( JdbmIndex.DEFAULT_DUPLICATE_LIMIT );
jdbmIndex.setWkDirPath( index.getWkDirPath() );
}
jdbmIndex.init( schemaManager, schemaManager.lookupAttributeTypeRegistry( index.getAttributeId() ) );
return jdbmIndex;
}
/**
* {@inheritDoc}
*/
protected synchronized void doDestroy() throws Exception
{
MultiException errors = new MultiException( I18n.err( I18n.ERR_577 ) );
if ( !initialized )
{
return;
}
try
{
super.doDestroy();
}
catch ( Exception e )
{
errors.addThrowable( e );
}
// This is specific to the JDBM store : close the record manager
try
{
recMan.close();
LOG.debug( "Closed record manager for {} partition.", suffixDn );
}
catch ( Throwable t )
{
LOG.error( I18n.err( I18n.ERR_127 ), t );
errors.addThrowable( t );
}
if ( errors.size() > 0 )
{
throw errors;
}
}
}