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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.schema;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.*;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.cql3.ColumnIdentifier;
import org.apache.cassandra.cql3.CqlBuilder;
import org.apache.cassandra.cql3.statements.schema.IndexTarget;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.exceptions.UnknownIndexException;
import org.apache.cassandra.index.Index;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.UUIDSerializer;
/**
* An immutable representation of secondary index metadata.
*/
public final class IndexMetadata
{
private static final Logger logger = LoggerFactory.getLogger(IndexMetadata.class);
private static final Pattern PATTERN_NON_WORD_CHAR = Pattern.compile("\\W");
private static final Pattern PATTERN_WORD_CHARS = Pattern.compile("\\w+");
public static final Serializer serializer = new Serializer();
public enum Kind
{
KEYS, CUSTOM, COMPOSITES
}
// UUID for serialization. This is a deterministic UUID generated from the index name
// Both the id and name are guaranteed unique per keyspace.
public final UUID id;
public final String name;
public final Kind kind;
public final Map options;
private IndexMetadata(String name,
Map options,
Kind kind)
{
this.id = UUID.nameUUIDFromBytes(name.getBytes());
this.name = name;
this.options = options == null ? ImmutableMap.of() : ImmutableMap.copyOf(options);
this.kind = kind;
}
public static IndexMetadata fromSchemaMetadata(String name, Kind kind, Map options)
{
return new IndexMetadata(name, options, kind);
}
public static IndexMetadata fromIndexTargets(List targets,
String name,
Kind kind,
Map options)
{
Map newOptions = new HashMap<>(options);
newOptions.put(IndexTarget.TARGET_OPTION_NAME, targets.stream()
.map(target -> target.asCqlString())
.collect(Collectors.joining(", ")));
return new IndexMetadata(name, newOptions, kind);
}
public static boolean isNameValid(String name)
{
return name != null && !name.isEmpty() && PATTERN_WORD_CHARS.matcher(name).matches();
}
public static String generateDefaultIndexName(String table, ColumnIdentifier column)
{
return PATTERN_NON_WORD_CHAR.matcher(table + "_" + column.toString() + "_idx").replaceAll("");
}
public static String generateDefaultIndexName(String table)
{
return PATTERN_NON_WORD_CHAR.matcher(table + "_" + "idx").replaceAll("");
}
public void validate(TableMetadata table)
{
if (!isNameValid(name))
throw new ConfigurationException("Illegal index name " + name);
if (kind == null)
throw new ConfigurationException("Index kind is null for index " + name);
if (kind == Kind.CUSTOM)
{
if (options == null || !options.containsKey(IndexTarget.CUSTOM_INDEX_OPTION_NAME))
throw new ConfigurationException(String.format("Required option missing for index %s : %s",
name, IndexTarget.CUSTOM_INDEX_OPTION_NAME));
String className = options.get(IndexTarget.CUSTOM_INDEX_OPTION_NAME);
Class indexerClass = FBUtilities.classForName(className, "custom indexer");
if (!Index.class.isAssignableFrom(indexerClass))
throw new ConfigurationException(String.format("Specified Indexer class (%s) does not implement the Indexer interface", className));
validateCustomIndexOptions(table, indexerClass, options);
}
}
private void validateCustomIndexOptions(TableMetadata table, Class indexerClass, Map options)
{
try
{
Map filteredOptions = Maps.filterKeys(options, key -> !key.equals(IndexTarget.CUSTOM_INDEX_OPTION_NAME));
if (filteredOptions.isEmpty())
return;
Map unknownOptions;
try
{
unknownOptions = (Map) indexerClass.getMethod("validateOptions", Map.class, TableMetadata.class).invoke(null, filteredOptions, table);
}
catch (NoSuchMethodException e)
{
unknownOptions = (Map) indexerClass.getMethod("validateOptions", Map.class).invoke(null, filteredOptions);
}
if (!unknownOptions.isEmpty())
throw new ConfigurationException(String.format("Properties specified %s are not understood by %s", unknownOptions.keySet(), indexerClass.getSimpleName()));
}
catch (NoSuchMethodException e)
{
logger.info("Indexer {} does not have a static validateOptions method. Validation ignored",
indexerClass.getName());
}
catch (InvocationTargetException e)
{
if (e.getTargetException() instanceof ConfigurationException)
throw (ConfigurationException) e.getTargetException();
throw new ConfigurationException("Failed to validate custom indexer options: " + options);
}
catch (ConfigurationException e)
{
throw e;
}
catch (Exception e)
{
throw new ConfigurationException("Failed to validate custom indexer options: " + options);
}
}
public boolean isCustom()
{
return kind == Kind.CUSTOM;
}
public boolean isKeys()
{
return kind == Kind.KEYS;
}
public boolean isComposites()
{
return kind == Kind.COMPOSITES;
}
@Override
public int hashCode()
{
return Objects.hashCode(id, name, kind, options);
}
public boolean equalsWithoutName(IndexMetadata other)
{
return Objects.equal(kind, other.kind)
&& Objects.equal(options, other.options);
}
@Override
public boolean equals(Object obj)
{
if (obj == this)
return true;
if (!(obj instanceof IndexMetadata))
return false;
IndexMetadata other = (IndexMetadata) obj;
return Objects.equal(id, other.id) && Objects.equal(name, other.name) && equalsWithoutName(other);
}
@Override
public String toString()
{
return new ToStringBuilder(this)
.append("id", id.toString())
.append("name", name)
.append("kind", kind)
.append("options", options)
.build();
}
public String toCqlString(TableMetadata table, boolean ifNotExists)
{
CqlBuilder builder = new CqlBuilder();
appendCqlTo(builder, table, ifNotExists);
return builder.toString();
}
/**
* Appends to the specified builder the CQL used to create this index.
* @param builder the builder to which the CQL myst be appended
* @param table the parent table
* @param ifNotExists includes "IF NOT EXISTS" into statement
*/
public void appendCqlTo(CqlBuilder builder, TableMetadata table, boolean ifNotExists)
{
if (isCustom())
{
Map copyOptions = new HashMap<>(options);
builder.append("CREATE CUSTOM INDEX ");
if (ifNotExists)
{
builder.append("IF NOT EXISTS ");
}
builder.appendQuotingIfNeeded(name)
.append(" ON ")
.append(table.toString())
.append(" (")
.append(copyOptions.remove(IndexTarget.TARGET_OPTION_NAME))
.append(") USING ")
.appendWithSingleQuotes(copyOptions.remove(IndexTarget.CUSTOM_INDEX_OPTION_NAME));
if (!copyOptions.isEmpty())
builder.append(" WITH OPTIONS = ")
.append(copyOptions);
}
else
{
builder.append("CREATE INDEX ");
if (ifNotExists)
{
builder.append("IF NOT EXISTS ");
}
builder.appendQuotingIfNeeded(name)
.append(" ON ")
.append(table.toString())
.append(" (")
.append(options.get(IndexTarget.TARGET_OPTION_NAME))
.append(')');
}
builder.append(';');
}
public static class Serializer
{
public void serialize(IndexMetadata metadata, DataOutputPlus out, int version) throws IOException
{
UUIDSerializer.serializer.serialize(metadata.id, out, version);
}
public IndexMetadata deserialize(DataInputPlus in, int version, TableMetadata table) throws IOException
{
UUID id = UUIDSerializer.serializer.deserialize(in, version);
return table.indexes.get(id).orElseThrow(() -> new UnknownIndexException(table, id));
}
public long serializedSize(IndexMetadata metadata, int version)
{
return UUIDSerializer.serializer.serializedSize(metadata.id, version);
}
}
}
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