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/*
* Copyright 2016-2019 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2016-2019 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk.unboundidds.tools;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.Entry;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.RDN;
import com.unboundid.ldif.LDIFException;
import com.unboundid.util.Debug;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.ldap.sdk.unboundidds.tools.ToolMessages.*;
/**
* This class provides an implementation of an LDIF reader entry translator that
* can be used to determine the set into which an entry should be placed by
* selecting the set that currently has the fewest entries.
*
*
* NOTE: This class, and other classes within the
* {@code com.unboundid.ldap.sdk.unboundidds} package structure, are only
* supported for use against Ping Identity, UnboundID, and
* Nokia/Alcatel-Lucent 8661 server products. These classes provide support
* for proprietary functionality or for external specifications that are not
* considered stable or mature enough to be guaranteed to work in an
* interoperable way with other types of LDAP servers.
*
*/
@ThreadSafety(level=ThreadSafetyLevel.NOT_THREADSAFE)
final class SplitLDIFFewestEntriesTranslator
extends SplitLDIFTranslator
{
// The map used to cache decisions made by this translator.
private final ConcurrentHashMap> rdnCache;
// A map used to keep track of the number of entries added to each set.
private final Map,AtomicLong> setCounts;
// The sets in which entries outside the split base should be placed.
private final Set outsideSplitBaseSetNames;
// The sets in which the split base entry should be placed.
private final Set splitBaseEntrySetNames;
/**
* Creates a new instance of this translator with the provided information.
*
* @param splitBaseDN The base DN below which to
* split entries.
* @param numSets The number of sets into which
* entries should be split.
* @param assumeFlatDIT Indicates whether to assume
* that the DIT is flat, and
* there aren't any entries more
* than one level below the
* split base DN. If this is
* {@code true}, then any
* entries more than one level
* below the split base DN will
* be considered an error.
* @param addEntriesOutsideSplitToAllSets Indicates whether entries
* outside the split should be
* added to all sets.
* @param addEntriesOutsideSplitToDedicatedSet Indicates whether entries
* outside the split should be
* added to all sets.
*/
SplitLDIFFewestEntriesTranslator(final DN splitBaseDN, final int numSets,
final boolean assumeFlatDIT,
final boolean addEntriesOutsideSplitToAllSets,
final boolean addEntriesOutsideSplitToDedicatedSet)
{
super(splitBaseDN);
if (assumeFlatDIT)
{
rdnCache = null;
}
else
{
rdnCache = new ConcurrentHashMap<>(StaticUtils.computeMapCapacity(100));
}
outsideSplitBaseSetNames =
new LinkedHashSet<>(StaticUtils.computeMapCapacity(numSets+1));
splitBaseEntrySetNames =
new LinkedHashSet<>(StaticUtils.computeMapCapacity(numSets));
if (addEntriesOutsideSplitToDedicatedSet)
{
outsideSplitBaseSetNames.add(SplitLDIFEntry.SET_NAME_OUTSIDE_SPLIT);
}
setCounts = new LinkedHashMap<>(StaticUtils.computeMapCapacity(numSets));
for (int i=0; i < numSets; i++)
{
final String setName = ".set" + (i+1);
final Set setSet = Collections.singleton(setName);
setCounts.put(setSet, new AtomicLong(0L));
splitBaseEntrySetNames.add(setName);
if (addEntriesOutsideSplitToAllSets)
{
outsideSplitBaseSetNames.add(setName);
}
}
}
/**
* {@inheritDoc}
*/
@Override()
public SplitLDIFEntry translate(final Entry original,
final long firstLineNumber)
throws LDIFException
{
// Get the parsed DN for the entry. If we can't, that's an error and we
// should only include it in the error set.
final DN dn;
try
{
dn = original.getParsedDN();
}
catch (final LDAPException le)
{
Debug.debugException(le);
return createEntry(original,
ERR_SPLIT_LDIF_FEWEST_ENTRIES_TRANSLATOR_CANNOT_PARSE_DN.get(
le.getMessage()),
getErrorSetNames());
}
// If the parsed DN is outside the split base DN, then return the
// appropriate sets for that.
if (! dn.isDescendantOf(getSplitBaseDN(), true))
{
return createEntry(original, outsideSplitBaseSetNames);
}
// If the parsed DN matches the split base DN, then it will always go into
// all of the split sets.
if (dn.equals(getSplitBaseDN()))
{
return createEntry(original, splitBaseEntrySetNames);
}
// Determine which RDN component is immediately below the split base DN.
final RDN[] rdns = dn.getRDNs();
final int targetRDNIndex = rdns.length - getSplitBaseRDNs().length - 1;
final String normalizedRDNString =
rdns[targetRDNIndex].toNormalizedString();
// If the target RDN component is not the first component of the DN, then
// we'll use the cache to send this entry to the same set as its parent.
if (targetRDNIndex > 0)
{
// If we aren't maintaining an RDN cache (which should only happen if
// the --assumeFlatDIT argument was provided), then this is an error.
if (rdnCache == null)
{
return createEntry(original,
ERR_SPLIT_LDIF_FEWEST_ENTRIES_TRANSLATOR_NON_FLAT_DIT.get(
getSplitBaseDN().toString()),
getErrorSetNames());
}
// Note that even if we are maintaining an RDN cache, it may not contain
// the information that we need to determine which set should hold this
// entry. There are two reasons for this:
//
// - The LDIF file contains an entry below the split base DN without
// including the parent for that entry, (or includes a child entry
// before its parent).
//
// - We are processing multiple entries in parallel, and the parent entry
// is currently being processed in another thread and that thread hasn't
// yet made the determination as to which set should be used for that
// parent entry.
//
// In either case, use null for the target set names. If we are in the
// parallel processing phase, then we will re-invoke this method later
// at a point in which we can be confident that the caching should have
// been performed If we still get null the second time through, then
// the caller will consider that an error and handle it appropriately.
final Set sets = rdnCache.get(normalizedRDNString);
if (sets != null)
{
setCounts.get(sets).incrementAndGet();
}
return createEntry(original, sets);
}
// At this point, we know that the entry is exactly one level below the
// split base DN. Iterate through the set counts and pick the set with the
// fewest entries. This is guaranteed to find a match.
long lowestCount = Long.MAX_VALUE;
Set lowestCountSetNames = null;
for (final Map.Entry,AtomicLong> e : setCounts.entrySet())
{
final long count = e.getValue().get();
if (count < lowestCount)
{
lowestCount = count;
lowestCountSetNames = e.getKey();
}
}
setCounts.get(lowestCountSetNames).incrementAndGet();
if (rdnCache != null)
{
rdnCache.put(normalizedRDNString, lowestCountSetNames);
}
return createEntry(original, lowestCountSetNames);
}
}
