/*
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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 2006-2008 Sun Microsystems, Inc.
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* Portions Copyright 2014-2016 ForgeRock AS.
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*/
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package org.opends.server.api;
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import static org.opends.messages.BackendMessages.*;
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import java.util.Collection;
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import java.util.Queue;
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import java.util.Set;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import org.forgerock.opendj.config.Configuration;
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import org.forgerock.opendj.config.server.ConfigException;
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import org.forgerock.opendj.ldap.ConditionResult;
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import org.forgerock.opendj.ldap.DN;
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import org.forgerock.opendj.ldap.ResultCode;
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import org.forgerock.opendj.ldap.schema.AttributeType;
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import org.forgerock.opendj.ldap.schema.MatchingRule;
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import org.forgerock.opendj.ldap.schema.UnknownSchemaElementException;
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import org.opends.server.backends.RebuildConfig;
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import org.opends.server.backends.VerifyConfig;
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import org.opends.server.core.AddOperation;
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import org.opends.server.core.DeleteOperation;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.core.ModifyDNOperation;
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import org.opends.server.core.ModifyOperation;
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import org.opends.server.core.PersistentSearch;
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import org.opends.server.core.PersistentSearch.CancellationCallback;
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import org.opends.server.core.SearchOperation;
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import org.opends.server.core.ServerContext;
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import org.opends.server.monitors.LocalBackendMonitor;
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import org.opends.server.types.BackupConfig;
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import org.opends.server.types.BackupDirectory;
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import org.opends.server.types.CanceledOperationException;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.Entry;
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import org.opends.server.types.IndexType;
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import org.opends.server.types.InitializationException;
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import org.opends.server.types.LDIFExportConfig;
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import org.opends.server.types.LDIFImportConfig;
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import org.opends.server.types.LDIFImportResult;
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import org.opends.server.types.RestoreConfig;
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import org.opends.server.types.SearchFilter;
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import org.opends.server.types.WritabilityMode;
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/**
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* This class defines the set of methods and structures that must be
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* implemented for a Directory Server backend.
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*
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* @param <C>
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* the type of the BackendCfg for the current backend
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*/
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@org.opends.server.types.PublicAPI(
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stability=org.opends.server.types.StabilityLevel.VOLATILE,
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mayInstantiate=false,
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mayExtend=true,
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mayInvoke=false)
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public abstract class LocalBackend<C extends Configuration> extends Backend<C>
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// should have been BackendCfg instead of Configuration
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{
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/** Indicates whether this is a private backend or one that holds user data. */
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private boolean isPrivateBackend;
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/** The writability mode for this backend. */
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private WritabilityMode writabilityMode = WritabilityMode.ENABLED;
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/** The set of persistent searches registered with this backend. */
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private final ConcurrentLinkedQueue<PersistentSearch> persistentSearches = new ConcurrentLinkedQueue<>();
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/** The backend monitor associated with this backend. */
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private LocalBackendMonitor backendMonitor;
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/**
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* Opens this backend based on the information provided when the backend was configured.
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* It also should open any underlying storage and register all suffixes with the server.
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*
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* @see #configureBackend
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*
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* @throws ConfigException If an unrecoverable problem arises while opening the backend.
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*
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* @throws InitializationException If a problem occurs during opening that is not
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* related to the server configuration.
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*/
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@Override
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public abstract void openBackend() throws ConfigException, InitializationException;
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@Override
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public final void finalizeBackend()
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{
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for (PersistentSearch psearch : persistentSearches)
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{
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psearch.cancel();
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}
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persistentSearches.clear();
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closeBackend();
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}
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/**
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* Performs any necessary work to finally close this backend, particularly
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* closing any underlying databases or connections and deregistering
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* any suffixes that it manages with the Directory Server.
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* <p>
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* It will be called as final step of <code>finalizeBackend()</code>,
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* so subclasses might override it.
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* </p>
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*/
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public void closeBackend()
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{
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}
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/**
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* Indicates whether search operations which target the specified
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* attribute in the indicated manner would be considered indexed
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* in this backend. The operation should be considered indexed only
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* if the specified operation can be completed efficiently within
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* the backend.
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* <BR><BR>
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* Note that this method should return a general result that covers
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* all values of the specified attribute. If a the specified
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* attribute is indexed in the indicated manner but some particular
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* values may still be treated as unindexed (e.g., if the number of
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* entries with that attribute value exceeds some threshold), then
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* this method should still return {@code true} for the specified
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* attribute and index type.
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*
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* @param attributeType The attribute type for which to make the
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* determination.
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* @param indexType The index type for which to make the
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* determination.
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*
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* @return {@code true} if search operations targeting the
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* specified attribute in the indicated manner should be
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* considered indexed, or {@code false} if not.
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*/
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public abstract boolean isIndexed(AttributeType attributeType, IndexType indexType);
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/**
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* Indicates whether extensible match search operations that target
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* the specified attribute with the given matching rule should be
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* considered indexed in this backend.
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*
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* @param attributeType The attribute type for which to make the
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* determination.
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* @param matchingRule The matching rule for which to make the
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* determination.
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*
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* @return {@code true} if extensible match search operations
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* targeting the specified attribute with the given
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* matching rule should be considered indexed, or
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* {@code false} if not.
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*/
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private boolean isIndexed(AttributeType attributeType, MatchingRule matchingRule)
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{
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return false; // FIXME This should be overridden by the JE Backend at least!
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}
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/**
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* Indicates whether a subtree search using the provided filter
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* would be indexed in this backend. This default implementation
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* uses a rough set of logic that makes a best-effort determination.
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* Subclasses that provide a more complete indexing mechanism may
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* wish to override this method and provide a more accurate result.
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*
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* @param filter The search filter for which to make the
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* determination.
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*
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* @return {@code true} if it is believed that the provided filter
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* would be indexed in this backend, or {@code false} if
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* not.
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*/
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public boolean isIndexed(SearchFilter filter)
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{
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switch (filter.getFilterType())
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{
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case AND:
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// At least one of the subordinate filter components must be
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// indexed.
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for (SearchFilter f : filter.getFilterComponents())
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{
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if (isIndexed(f))
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{
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return true;
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}
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}
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return false;
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case OR:
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for (SearchFilter f : filter.getFilterComponents())
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{
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if (! isIndexed(f))
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{
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return false;
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}
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}
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return !filter.getFilterComponents().isEmpty();
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case NOT:
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// NOT filters are not considered indexed by default.
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return false;
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case EQUALITY:
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return isIndexed(filter.getAttributeType(), IndexType.EQUALITY);
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case SUBSTRING:
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return isIndexed(filter.getAttributeType(), IndexType.SUBSTRING);
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case GREATER_OR_EQUAL:
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return isIndexed(filter.getAttributeType(), IndexType.GREATER_OR_EQUAL);
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case LESS_OR_EQUAL:
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return isIndexed(filter.getAttributeType(), IndexType.LESS_OR_EQUAL);
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case PRESENT:
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return isIndexed(filter.getAttributeType(), IndexType.PRESENCE);
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case APPROXIMATE_MATCH:
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return isIndexed(filter.getAttributeType(), IndexType.APPROXIMATE);
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case EXTENSIBLE_MATCH:
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// The attribute type must be provided for us to make the
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// determination. If a matching rule ID is provided, then
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// we'll use it as well, but if not then we'll use the
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// default equality matching rule for the attribute type.
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AttributeType attrType = filter.getAttributeType();
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if (attrType == null)
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{
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return false;
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}
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String matchingRuleID = filter.getMatchingRuleID();
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MatchingRule matchingRule = getMatchingRule(attrType, matchingRuleID);
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// FIXME isIndexed() always return false down below
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return matchingRule != null && isIndexed(attrType, matchingRule);
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default:
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return false;
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}
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}
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private MatchingRule getMatchingRule(AttributeType attrType, String matchingRuleID)
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{
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if (matchingRuleID == null)
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{
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return attrType.getEqualityMatchingRule();
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}
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try
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{
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return DirectoryServer.getInstance().getServerContext().getSchema().getMatchingRule(matchingRuleID);
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}
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catch (UnknownSchemaElementException e)
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{
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return null;
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}
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}
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/**
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* Indicates whether the requested entry has any subordinates.
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*
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* @param entryDN The distinguished name of the entry.
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*
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* @return {@code ConditionResult.TRUE} if the entry has one or more
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* subordinates or {@code ConditionResult.FALSE} otherwise
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* or {@code ConditionResult.UNDEFINED} if it can not be
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* determined.
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*
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* @throws DirectoryException If a problem occurs while trying to
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* retrieve the entry.
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*/
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public abstract ConditionResult hasSubordinates(DN entryDN) throws DirectoryException;
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/**
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* Retrieves the number of subordinates immediately below the requested entry.
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*
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* @param parentDN
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* The distinguished name of the parent.
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* @return The number of subordinate entries for the requested entry.
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* @throws DirectoryException
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* If baseDN isn't a base dn managed by this backend or if a problem occurs while trying to retrieve the
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* entry.
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* @throws NullPointerException
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* if baseDN is null.
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*/
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public abstract long getNumberOfChildren(DN parentDN) throws DirectoryException;
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/**
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* Retrieves the number of entries for the specified base DN including all entries from the requested entry to the
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* lowest level in the tree.
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*
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* @param baseDN
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* The base distinguished name.
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* @return The number of subordinate entries including the base dn.
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* @throws DirectoryException
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* If baseDN isn't a base dn managed by this backend or if a problem occurs while trying to retrieve the
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* entry.
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* @throws NullPointerException
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* if baseDN is null.
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*/
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public abstract long getNumberOfEntriesInBaseDN(DN baseDN) throws DirectoryException;
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/**
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* Indicates whether an entry with the specified DN exists in the backend. The default
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* implementation calls {@code getEntry}, but backend implementations may override this with a
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* more efficient version. The caller is not required to hold any locks on the specified DN.
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*
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* @param entryDN
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* The DN of the entry for which to determine existence.
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* @return {@code true} if the specified entry exists in this backend, or {@code false} if it does
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* not.
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* @throws DirectoryException
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* If a problem occurs while trying to make the determination.
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*/
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public boolean entryExists(DN entryDN) throws DirectoryException
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{
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return getEntry(entryDN) != null;
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}
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/**
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* Retrieves the requested entry from this backend. The caller is not required to hold any locks
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* on the specified DN.
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*
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* @param entryDN
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* The distinguished name of the entry to retrieve.
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* @return The requested entry, or {@code null} if the entry does not exist.
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* @throws DirectoryException
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* If a problem occurs while trying to retrieve the entry.
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*/
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public abstract Entry getEntry(DN entryDN) throws DirectoryException;
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/**
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* Adds the provided entry to this backend. This method must ensure
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* that the entry is appropriate for the backend and that no entry
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* already exists with the same DN. The caller must hold a write
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* lock on the DN of the provided entry.
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*
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* @param entry The entry to add to this backend.
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* @param addOperation The add operation with which the new entry
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* is associated. This may be {@code null}
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* for adds performed internally.
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*
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* @throws DirectoryException If a problem occurs while trying to
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* add the entry.
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*
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* @throws CanceledOperationException If this backend noticed and
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* reacted to a request to
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* cancel or abandon the add
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* operation.
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*/
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public abstract void addEntry(Entry entry, AddOperation addOperation)
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throws DirectoryException, CanceledOperationException;
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/**
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* Removes the specified entry from this backend. This method must
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* ensure that the entry exists and that it does not have any
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* subordinate entries (unless the backend supports a subtree delete
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* operation and the client included the appropriate information in
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* the request). The caller must hold a write lock on the provided
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* entry DN.
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*
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* @param entryDN The DN of the entry to remove from this
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* backend.
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* @param deleteOperation The delete operation with which this
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* action is associated. This may be
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* {@code null} for deletes performed
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* internally.
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*
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* @throws DirectoryException If a problem occurs while trying to
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* remove the entry.
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*
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* @throws CanceledOperationException If this backend noticed and
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* reacted to a request to
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* cancel or abandon the
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* delete operation.
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*/
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public abstract void deleteEntry(DN entryDN, DeleteOperation deleteOperation)
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throws DirectoryException, CanceledOperationException;
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/**
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* Replaces the specified entry with the provided entry in this
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* backend. The backend must ensure that an entry already exists
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* with the same DN as the provided entry. The caller must hold a
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* write lock on the DN of the provided entry.
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*
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* @param oldEntry
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* The original entry that is being replaced.
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* @param newEntry
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* The new entry to use in place of the existing entry with
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* the same DN.
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* @param modifyOperation
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* The modify operation with which this action is
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* associated. This may be {@code null} for modifications
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* performed internally.
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* @throws DirectoryException
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* If a problem occurs while trying to replace the entry.
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* @throws CanceledOperationException
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* If this backend noticed and reacted to a request to
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* cancel or abandon the modify operation.
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*/
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public abstract void replaceEntry(Entry oldEntry, Entry newEntry,
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ModifyOperation modifyOperation) throws DirectoryException,
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CanceledOperationException;
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/**
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* Moves and/or renames the provided entry in this backend, altering
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* any subordinate entries as necessary. This must ensure that an
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* entry already exists with the provided current DN, and that no
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* entry exists with the target DN of the provided entry. The caller
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* must hold write locks on both the current DN and the new DN for
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* the entry.
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*
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* @param currentDN
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* The current DN of the entry to be moved/renamed.
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* @param entry
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* The new content to use for the entry.
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* @param modifyDNOperation
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* The modify DN operation with which this action is
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* associated. This may be {@code null} for modify DN
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* operations performed internally.
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* @throws DirectoryException
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* If a problem occurs while trying to perform the rename.
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* @throws CanceledOperationException
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* If this backend noticed and reacted to a request to
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* cancel or abandon the modify DN operation.
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*/
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public abstract void renameEntry(DN currentDN, Entry entry, ModifyDNOperation modifyDNOperation)
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throws DirectoryException, CanceledOperationException;
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/**
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* Processes the specified search in this backend. Matching entries
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* should be provided back to the core server using the
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* {@code SearchOperation.returnEntry} method. The caller is not
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* required to have any locks when calling this operation.
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*
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* @param searchOperation The search operation to be processed.
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*
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* @throws DirectoryException If a problem occurs while processing
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* the search.
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*
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* @throws CanceledOperationException If this backend noticed and
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* reacted to a request to
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* cancel or abandon the
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* search operation.
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*/
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public abstract void search(SearchOperation searchOperation)
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throws DirectoryException, CanceledOperationException;
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/** Enumeration of optional backend operations. */
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public static enum BackendOperation
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{
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/** Indicates whether this backend supports indexing attributes to speed up searches. */
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INDEXING,
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/** Indicates whether this backend supports exporting the data it contains to an LDIF file. */
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LDIF_EXPORT,
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/** Indicates whether this backend supports importing its data from an LDIF file. */
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LDIF_IMPORT,
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/**
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* Indicates whether this backend provides a backup mechanism of any kind. This method is used
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* by the backup process when backing up all backends to determine whether this backend is one
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* that should be skipped. It should only return {@code true} for backends that it is not
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* possible to archive directly (e.g., those that don't store their data locally, but rather
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* pass through requests to some other repository).
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*/
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BACKUP,
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/** Indicates whether this backend can restore a backup. */
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RESTORE;
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}
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/**
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* Indicates whether this backend supports the provided backend operation.
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*
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* @param backendOperation
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* the backend operation
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* @return {@code true} if this backend supports the provided backend operation, {@code false}
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* otherwise.
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*/
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public abstract boolean supports(BackendOperation backendOperation);
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/**
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* Exports the contents of this backend to LDIF. This method should only be called if
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* {@link #supports(BackendOperation)} with {@link BackendOperation#LDIF_EXPORT} returns
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* {@code true}.
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* <p>
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* Note that the server will not explicitly initialize this backend before calling this method.
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*
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* @param exportConfig
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* The configuration to use when performing the export.
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* @throws DirectoryException
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* If a problem occurs while performing the LDIF export.
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*/
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public abstract void exportLDIF(LDIFExportConfig exportConfig) throws DirectoryException;
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/**
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* Imports information from an LDIF file into this backend. This method should only be called if
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* {@link #supports(BackendOperation)} with {@link BackendOperation#LDIF_IMPORT} returns
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* {@code true}.
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* <p>
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* Note that the server will not explicitly initialize this backend before calling this method.
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*
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* @param importConfig
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* The configuration to use when performing the import.
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* @param serverContext
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* The server context
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* @return Information about the result of the import processing.
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* @throws DirectoryException
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* If a problem occurs while performing the LDIF import.
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*/
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public abstract LDIFImportResult importLDIF(LDIFImportConfig importConfig, ServerContext serverContext)
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throws DirectoryException;
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/**
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* Verify the integrity of the backend instance.
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*
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* @param verifyConfig
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* The verify configuration.
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* @return The results of the operation.
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* @throws ConfigException
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* If an unrecoverable problem arises during initialization.
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* @throws InitializationException
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* If a problem occurs during initialization that is not related to the server
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* configuration.
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* @throws DirectoryException
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* If a Directory Server error occurs.
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*/
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public long verifyBackend(VerifyConfig verifyConfig)
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throws InitializationException, ConfigException, DirectoryException
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{
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throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM,
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ERR_INDEXES_NOT_SUPPORTED.get(getBackendID()));
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}
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/**
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* Rebuild indexes in the backend instance. Note that the server will not explicitly initialize
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* this backend before calling this method.
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*
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* @param rebuildConfig
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* The rebuild configuration.
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* @param serverContext
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* The server context for this instance
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* @throws ConfigException
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* If an unrecoverable problem arises during initialization.
|
* @throws InitializationException
|
* If a problem occurs during initialization that is not related to the server
|
* configuration.
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* @throws DirectoryException
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* If a Directory Server error occurs.
|
*/
|
public void rebuildBackend(RebuildConfig rebuildConfig, ServerContext serverContext)
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throws InitializationException, ConfigException, DirectoryException
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{
|
throw new DirectoryException(ResultCode.UNWILLING_TO_PERFORM,
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ERR_INDEXES_NOT_SUPPORTED.get(getBackendID()));
|
}
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|
/**
|
* Creates a backup of the contents of this backend in a form that may be restored at a later date
|
* if necessary. This method should only be called if {@link #supports(BackendOperation)} with
|
* {@link BackendOperation#BACKUP} returns {@code true}.
|
* <p>
|
* Note that the server will not explicitly initialize this backend before calling this method.
|
*
|
* @param backupConfig
|
* The configuration to use when performing the backup.
|
* @throws DirectoryException
|
* If a problem occurs while performing the backup.
|
*/
|
public abstract void createBackup(BackupConfig backupConfig) throws DirectoryException;
|
|
/**
|
* Removes the specified backup if it is possible to do so.
|
*
|
* @param backupDirectory The backup directory structure with
|
* which the specified backup is
|
* associated.
|
* @param backupID The backup ID for the backup to be
|
* removed.
|
*
|
* @throws DirectoryException If it is not possible to remove the
|
* specified backup for some reason
|
* (e.g., no such backup exists or
|
* there are other backups that are
|
* dependent upon it).
|
*/
|
public abstract void removeBackup(BackupDirectory backupDirectory, String backupID)
|
throws DirectoryException;
|
|
/**
|
* Restores a backup of the contents of this backend. This method should only be called if
|
* {@link #supports(BackendOperation)} with {@link BackendOperation#RESTORE} returns {@code true}.
|
* <p>
|
* Note that the server will not explicitly initialize this backend before calling this method.
|
*
|
* @param restoreConfig
|
* The configuration to use when performing the restore.
|
* @throws DirectoryException
|
* If a problem occurs while performing the restore.
|
*/
|
public abstract void restoreBackup(RestoreConfig restoreConfig) throws DirectoryException;
|
|
/**
|
* Retrieves the writability mode for this backend.
|
*
|
* @return The writability mode for this backend.
|
*/
|
public final WritabilityMode getWritabilityMode()
|
{
|
return writabilityMode;
|
}
|
|
/**
|
* Specifies the writability mode for this backend.
|
*
|
* @param writabilityMode The writability mode for this backend.
|
*/
|
public final void setWritabilityMode(WritabilityMode writabilityMode)
|
{
|
this.writabilityMode = writabilityMode != null ? writabilityMode : WritabilityMode.ENABLED;
|
}
|
|
@Override
|
public final boolean isPrivateBackend()
|
{
|
return isPrivateBackend;
|
}
|
|
/**
|
* Specifies whether this backend holds private data or user data.
|
*
|
* @param isPrivateBackend Specifies whether this backend holds
|
* private data or user data.
|
*/
|
public final void setPrivateBackend(boolean isPrivateBackend)
|
{
|
this.isPrivateBackend = isPrivateBackend;
|
}
|
|
@Override
|
public final boolean isDefaultRoute()
|
{
|
return false;
|
}
|
|
/**
|
* Registers the provided persistent search operation with this backend so
|
* that it will be notified of any add, delete, modify, or modify DN
|
* operations that are performed.
|
*
|
* @param persistentSearch
|
* The persistent search operation to register with this backend
|
* @throws DirectoryException
|
* If a problem occurs while registering the persistent search
|
*/
|
public void registerPersistentSearch(PersistentSearch persistentSearch) throws DirectoryException
|
{
|
persistentSearches.add(persistentSearch);
|
|
persistentSearch.registerCancellationCallback(new CancellationCallback()
|
{
|
@Override
|
public void persistentSearchCancelled(PersistentSearch psearch)
|
{
|
persistentSearches.remove(psearch);
|
}
|
});
|
}
|
|
/**
|
* Returns the persistent searches currently active against this local
|
* backend.
|
*
|
* @return the list of persistent searches currently active against this local
|
* backend
|
*/
|
public Queue<PersistentSearch> getPersistentSearches()
|
{
|
return persistentSearches;
|
}
|
|
/**
|
* Retrieves the total number of entries contained in this backend,
|
* if that information is available.
|
*
|
* @return The total number of entries contained in this backend,
|
* or -1 if that information is not available.
|
*/
|
public abstract long getEntryCount();
|
|
/**
|
* Indicates whether this backend should be used to handle
|
* operations for the provided entry.
|
*
|
* @param entryDN The DN of the entry for which to make the
|
* determination.
|
*
|
* @return {@code true} if this backend handles operations for the
|
* provided entry, or {@code false} if it does not.
|
*/
|
public final boolean handlesEntry(DN entryDN)
|
{
|
Backend<?> backend =
|
DirectoryServer.getInstance().getServerContext().getBackendConfigManager().findBackendForEntry(entryDN);
|
return backend != null && backend == this;
|
}
|
|
/**
|
* Retrieves the backend monitor that is associated with this
|
* backend.
|
*
|
* @return The backend monitor that is associated with this
|
* backend, or {@code null} if none has been assigned.
|
*/
|
public final LocalBackendMonitor getBackendMonitor()
|
{
|
return backendMonitor;
|
}
|
|
/**
|
* Sets the backend monitor for this backend.
|
*
|
* @param backendMonitor The backend monitor for this backend.
|
*/
|
public final void setBackendMonitor(LocalBackendMonitor backendMonitor)
|
{
|
this.backendMonitor = backendMonitor;
|
}
|
|
/**
|
* Indicates whether this backend supports the specified control.
|
*
|
* @param controlOID The OID of the control for which to make the
|
* determination.
|
*
|
* @return {@code true} if this backends supports the control with
|
* the specified OID, or {@code false} if it does not.
|
*/
|
public final boolean supportsControl(String controlOID)
|
{
|
Set<String> supportedControls = getSupportedControls();
|
return supportedControls != null && supportedControls.contains(controlOID);
|
}
|
|
/**
|
* Indicates whether a backend should be used to handle operations
|
* for the provided entry given the set of base DNs and exclude DNs.
|
*
|
* @param entryDN The DN of the entry for which to make the
|
* determination.
|
* @param baseDNs The set of base DNs for the backend.
|
* @param excludeDNs The set of DNs that should be excluded from
|
* the backend.
|
*
|
* @return {@code true} if the backend should handle operations for
|
* the provided entry, or {@code false} if it does not.
|
*/
|
public static boolean handlesEntry(DN entryDN, Collection<DN> baseDNs, Collection<DN> excludeDNs)
|
{
|
for (DN baseDN : baseDNs)
|
{
|
if (entryDN.isSubordinateOrEqualTo(baseDN) && !isExcluded(excludeDNs, entryDN))
|
{
|
return true;
|
}
|
}
|
return false;
|
}
|
|
private static boolean isExcluded(Collection<DN> excludeDNs, DN entryDN)
|
{
|
if (excludeDNs == null || excludeDNs.isEmpty())
|
{
|
return false;
|
}
|
for (DN excludeDN : excludeDNs)
|
{
|
if (entryDN.isSubordinateOrEqualTo(excludeDN))
|
{
|
return true;
|
}
|
}
|
return false;
|
}
|
}
|
