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Cassandra support for Spring Data
/*
* Copyright 2016-2020 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.data.cassandra.core;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.jetbrains.annotations.NotNull;
import org.springframework.data.cassandra.core.cql.generator.CreateIndexCqlGenerator;
import org.springframework.data.cassandra.core.cql.generator.CreateTableCqlGenerator;
import org.springframework.data.cassandra.core.cql.generator.CreateUserTypeCqlGenerator;
import org.springframework.data.cassandra.core.cql.keyspace.CreateIndexSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.CreateTableSpecification;
import org.springframework.data.cassandra.core.cql.keyspace.CreateUserTypeSpecification;
import org.springframework.data.cassandra.core.mapping.BasicCassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.CassandraMappingContext;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentProperty;
import org.springframework.data.util.Streamable;
import org.springframework.util.Assert;
import com.datastax.oss.driver.api.core.CqlIdentifier;
/**
* Schema creation support for Cassandra based on {@link CassandraMappingContext} and {@link CassandraPersistentEntity}.
* This class generates CQL to create user types (UDT) and tables.
*
* @author Mark Paluch
* @author Jens Schauder
* @since 1.5
* @see org.springframework.data.cassandra.core.mapping.Table
* @see org.springframework.data.cassandra.core.mapping.UserDefinedType
* @see org.springframework.data.cassandra.core.mapping.CassandraType
*/
public class CassandraPersistentEntitySchemaCreator {
private final CassandraAdminOperations cassandraAdminOperations;
private final CassandraMappingContext mappingContext;
/**
* Create a new {@link CassandraPersistentEntitySchemaCreator} for the given {@link CassandraMappingContext} and
* {@link CassandraAdminOperations}.
*
* @param mappingContext must not be {@literal null}.
* @param cassandraAdminOperations must not be {@literal null}.
* @since 3.0
*/
public CassandraPersistentEntitySchemaCreator(CassandraAdminOperations cassandraAdminOperations) {
Assert.notNull(cassandraAdminOperations, "CassandraAdminOperations must not be null");
this.cassandraAdminOperations = cassandraAdminOperations;
this.mappingContext = cassandraAdminOperations.getConverter().getMappingContext();
}
/**
* Create a new {@link CassandraPersistentEntitySchemaCreator} for the given {@link CassandraMappingContext} and
* {@link CassandraAdminOperations}.
*
* @param mappingContext must not be {@literal null}.
* @param cassandraAdminOperations must not be {@literal null}.
*/
public CassandraPersistentEntitySchemaCreator(CassandraMappingContext mappingContext,
CassandraAdminOperations cassandraAdminOperations) {
Assert.notNull(cassandraAdminOperations, "CassandraAdminOperations must not be null");
Assert.notNull(mappingContext, "CassandraMappingContext must not be null");
this.cassandraAdminOperations = cassandraAdminOperations;
this.mappingContext = mappingContext;
}
/**
* Create tables from types known to {@link CassandraMappingContext}.
*
* @param ifNotExists {@literal true} to create tables using {@code IF NOT EXISTS}.
*/
public void createTables(boolean ifNotExists) {
createTableSpecifications(ifNotExists).stream() //
.map(CreateTableCqlGenerator::toCql) //
.forEach(cql -> this.cassandraAdminOperations.getCqlOperations().execute(cql));
}
/**
* Create {@link List} of {@link CreateTableSpecification}.
*
* @param ifNotExists {@literal true} to create tables using {@code IF NOT EXISTS}.
* @return {@link List} of {@link CreateTableSpecification}.
*/
protected List createTableSpecifications(boolean ifNotExists) {
return this.mappingContext.getTableEntities() //
.stream() //
.map(entity -> cassandraAdminOperations.getSchemaFactory().getCreateTableSpecificationFor(entity)
.ifNotExists(ifNotExists)) //
.collect(Collectors.toList());
}
/**
* Create indexes from types known to {@link CassandraMappingContext}.
*
* @param ifNotExists {@literal true} to create tables using {@code IF NOT EXISTS}.
*/
public void createIndexes(boolean ifNotExists) {
createIndexSpecifications(ifNotExists).stream() //
.map(CreateIndexCqlGenerator::toCql) //
.forEach(cql -> this.cassandraAdminOperations.getCqlOperations().execute(cql));
}
/**
* Create {@link List} of {@link CreateIndexSpecification}.
*
* @param ifNotExists {@literal true} to create indexes using {@code IF NOT EXISTS}.
* @return {@link List} of {@link CreateIndexSpecification}.
*/
protected List createIndexSpecifications(boolean ifNotExists) {
return this.mappingContext.getTableEntities() //
.stream() //
.flatMap(entity -> cassandraAdminOperations.getSchemaFactory().getCreateIndexSpecificationsFor(entity).stream()) //
.peek(it -> it.ifNotExists(ifNotExists)) //
.collect(Collectors.toList());
}
/**
* Create user types from types known to {@link CassandraMappingContext}.
*
* @param ifNotExists {@literal true} to create types using {@code IF NOT EXISTS}.
*/
public void createUserTypes(boolean ifNotExists) {
createUserTypeSpecifications(ifNotExists).stream() //
.map(CreateUserTypeCqlGenerator::toCql) //
.forEach(cql -> this.cassandraAdminOperations.getCqlOperations().execute(cql));
}
/**
* Create {@link List} of {@link CreateUserTypeSpecification}.
*
* @param ifNotExists {@literal true} to create types using {@code IF NOT EXISTS}.
* @return {@link List} of {@link CreateUserTypeSpecification}.
*/
protected List createUserTypeSpecifications(boolean ifNotExists) {
List> entities = new ArrayList<>(
this.mappingContext.getUserDefinedTypeEntities());
Map> byTableName = entities.stream()
.collect(Collectors.toMap(CassandraPersistentEntity::getTableName, entity -> entity));
List specifications = new ArrayList<>();
UserDefinedTypeSet udts = new UserDefinedTypeSet();
entities.forEach(entity -> {
udts.add(entity.getTableName());
visitUserTypes(entity, udts);
});
specifications.addAll(udts.stream()
.map(identifier -> cassandraAdminOperations.getSchemaFactory()
.getCreateUserTypeSpecificationFor(byTableName.get(identifier)).ifNotExists(ifNotExists))
.collect(Collectors.toList()));
return specifications;
}
private void visitUserTypes(CassandraPersistentEntity entity, UserDefinedTypeSet udts) {
for (CassandraPersistentProperty property : entity) {
BasicCassandraPersistentEntity propertyType = this.mappingContext.getPersistentEntity(property);
if (propertyType == null) {
continue;
}
if (propertyType.isUserDefinedType()) {
if (udts.add(propertyType.getTableName())) {
visitUserTypes(propertyType, udts);
}
udts.addDependency(entity.getTableName(), propertyType.getTableName());
}
}
}
/**
* Object to record dependencies and report them in the order of creation.
*/
static class UserDefinedTypeSet implements Streamable {
private final Set seen = new HashSet<>();
private final List creationOrder = new ArrayList<>();
public boolean add(CqlIdentifier cqlIdentifier) {
if (seen.add(cqlIdentifier)) {
creationOrder.add(new DependencyNode(cqlIdentifier));
return true;
}
return false;
}
@NotNull
@Override
public Iterator iterator() {
// Return items in creation order considering dependencies
return creationOrder.stream() //
.sorted((left, right) -> {
if (left.dependsOn(right.getIdentifier())) {
return 1;
}
if (right.dependsOn(left.getIdentifier())) {
return -1;
}
return 0;
}) //
.map(DependencyNode::getIdentifier) //
.iterator();
}
/**
* Updates the dependency order.
*
* @param typeToCreate the client of {@code dependsOn}.
* @param dependsOn the dependency required by {@code typeToCreate}.
*/
void addDependency(CqlIdentifier typeToCreate, CqlIdentifier dependsOn) {
for (DependencyNode toCreate : creationOrder) {
if (toCreate.matches(typeToCreate)) {
toCreate.addDependency(dependsOn);
}
}
}
static class DependencyNode {
private final CqlIdentifier identifier;
private final List dependsOn = new ArrayList<>();
DependencyNode(CqlIdentifier identifier) {
this.identifier = identifier;
}
public CqlIdentifier getIdentifier() {
return identifier;
}
boolean matches(CqlIdentifier typeToCreate) {
return identifier.equals(typeToCreate);
}
void addDependency(CqlIdentifier dependsOn) {
this.dependsOn.add(dependsOn);
}
boolean dependsOn(CqlIdentifier identifier) {
return this.dependsOn.contains(identifier);
}
}
}
}