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/*
* Copyright 2016-2021 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 reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.publisher.SynchronousSink;
import java.util.Collections;
import java.util.function.BiConsumer;
import java.util.function.Function;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.OptimisticLockingFailureException;
import org.springframework.dao.support.DataAccessUtils;
import org.springframework.data.cassandra.ReactiveResultSet;
import org.springframework.data.cassandra.ReactiveSession;
import org.springframework.data.cassandra.ReactiveSessionFactory;
import org.springframework.data.cassandra.core.EntityOperations.AdaptibleEntity;
import org.springframework.data.cassandra.core.convert.CassandraConverter;
import org.springframework.data.cassandra.core.convert.MappingCassandraConverter;
import org.springframework.data.cassandra.core.cql.*;
import org.springframework.data.cassandra.core.cql.session.DefaultReactiveSessionFactory;
import org.springframework.data.cassandra.core.cql.util.StatementBuilder;
import org.springframework.data.cassandra.core.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.core.mapping.event.AfterConvertEvent;
import org.springframework.data.cassandra.core.mapping.event.AfterDeleteEvent;
import org.springframework.data.cassandra.core.mapping.event.AfterLoadEvent;
import org.springframework.data.cassandra.core.mapping.event.AfterSaveEvent;
import org.springframework.data.cassandra.core.mapping.event.BeforeDeleteEvent;
import org.springframework.data.cassandra.core.mapping.event.BeforeSaveEvent;
import org.springframework.data.cassandra.core.mapping.event.CassandraMappingEvent;
import org.springframework.data.cassandra.core.mapping.event.ReactiveBeforeConvertCallback;
import org.springframework.data.cassandra.core.mapping.event.ReactiveBeforeSaveCallback;
import org.springframework.data.cassandra.core.query.Columns;
import org.springframework.data.cassandra.core.query.Query;
import org.springframework.data.domain.Slice;
import org.springframework.data.domain.SliceImpl;
import org.springframework.data.mapping.callback.EntityCallbacks;
import org.springframework.data.mapping.callback.ReactiveEntityCallbacks;
import org.springframework.data.projection.ProjectionFactory;
import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.DriverException;
import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
import com.datastax.oss.driver.api.core.context.DriverContext;
import com.datastax.oss.driver.api.core.cql.BoundStatement;
import com.datastax.oss.driver.api.core.cql.PreparedStatement;
import com.datastax.oss.driver.api.core.cql.Row;
import com.datastax.oss.driver.api.core.cql.SimpleStatement;
import com.datastax.oss.driver.api.core.cql.Statement;
import com.datastax.oss.driver.api.querybuilder.QueryBuilder;
import com.datastax.oss.driver.api.querybuilder.delete.Delete;
import com.datastax.oss.driver.api.querybuilder.insert.Insert;
import com.datastax.oss.driver.api.querybuilder.insert.RegularInsert;
import com.datastax.oss.driver.api.querybuilder.select.Select;
import com.datastax.oss.driver.api.querybuilder.truncate.Truncate;
import com.datastax.oss.driver.api.querybuilder.update.Update;
/**
* Primary implementation of {@link ReactiveCassandraOperations}. It simplifies the use of Reactive Cassandra usage and
* helps to avoid common errors. It executes core Cassandra workflow. This class executes CQL queries or updates,
* initiating iteration over {@link ReactiveResultSet} and catching Cassandra exceptions and translating them to the
* generic, more informative exception hierarchy defined in the {@code org.springframework.dao} package.
*
* Can be used within a service implementation via direct instantiation with a {@link ReactiveSessionFactory} reference,
* or get prepared in an application context and given to services as bean reference.
*
* This class supports the use of prepared statements when enabling {@link #setUsePreparedStatements(boolean)}. All
* statements created by methods of this class (such as {@link #select(Query, Class)} or
* {@link #update(Query, org.springframework.data.cassandra.core.query.Update, Class)} will be executed as prepared
* statements. Also, statements accepted by methods (such as {@link #select(String, Class)} or
* {@link #select(Statement, Class) and others}) will be prepared prior to execution. Note that {@link Statement}
* objects passed to methods must be {@link SimpleStatement} so that these can be prepared.
*
* Note: The {@link ReactiveSessionFactory} should always be configured as a bean in the application context, in the
* first case given to the service directly, in the second case to the prepared template.
*
* @author Mark Paluch
* @author John Blum
* @author Lukasz Antoniak
* @author Hleb Albau
* @since 2.0
*/
public class ReactiveCassandraTemplate
implements ReactiveCassandraOperations, ApplicationEventPublisherAware, ApplicationContextAware {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final ReactiveCqlOperations cqlOperations;
private final CassandraConverter converter;
private final EntityOperations entityOperations;
private final SpelAwareProxyProjectionFactory projectionFactory;
private final StatementFactory statementFactory;
private @Nullable ApplicationEventPublisher eventPublisher;
private @Nullable ReactiveEntityCallbacks entityCallbacks;
private boolean usePreparedStatements = true;
/**
* Creates an instance of {@link ReactiveCassandraTemplate} initialized with the given {@link ReactiveSession} and a
* default {@link MappingCassandraConverter}.
*
* @param session {@link ReactiveSession} used to interact with Cassandra; must not be {@literal null}.
* @see CassandraConverter
* @see Session
*/
public ReactiveCassandraTemplate(ReactiveSession session) {
this(session, newConverter());
}
/**
* Create an instance of {@link CassandraTemplate} initialized with the given {@link ReactiveSession} and
* {@link CassandraConverter}.
*
* @param session {@link ReactiveSession} used to interact with Cassandra; must not be {@literal null}.
* @param converter {@link CassandraConverter} used to convert between Java and Cassandra types; must not be
* {@literal null}.
* @see org.springframework.data.cassandra.core.convert.CassandraConverter
* @see com.datastax.oss.driver.api.core.CqlSession
*/
public ReactiveCassandraTemplate(ReactiveSession session, CassandraConverter converter) {
this(new DefaultReactiveSessionFactory(session), converter);
}
/**
* Create an instance of {@link ReactiveCassandraTemplate} initialized with the given {@link ReactiveSessionFactory}
* and {@link CassandraConverter}.
*
* @param sessionFactory {@link ReactiveSessionFactory} used to interact with Cassandra; must not be {@literal null}.
* @param converter {@link CassandraConverter} used to convert between Java and Cassandra types; must not be
* {@literal null}.
* @see org.springframework.data.cassandra.core.convert.CassandraConverter
* @see com.datastax.oss.driver.api.core.CqlSession
*/
public ReactiveCassandraTemplate(ReactiveSessionFactory sessionFactory, CassandraConverter converter) {
this(new ReactiveCqlTemplate(sessionFactory), converter);
}
/**
* Create an instance of {@link ReactiveCassandraTemplate} initialized with the given {@link ReactiveCqlOperations}
* and {@link CassandraConverter}.
*
* @param reactiveCqlOperations {@link ReactiveCqlOperations} used to interact with Cassandra; must not be
* {@literal null}.
* @param converter {@link CassandraConverter} used to convert between Java and Cassandra types; must not be
* {@literal null}.
* @see org.springframework.data.cassandra.core.convert.CassandraConverter
* @see com.datastax.oss.driver.api.core.CqlSession
*/
public ReactiveCassandraTemplate(ReactiveCqlOperations reactiveCqlOperations, CassandraConverter converter) {
Assert.notNull(reactiveCqlOperations, "ReactiveCqlOperations must not be null");
Assert.notNull(converter, "CassandraConverter must not be null");
this.converter = converter;
this.cqlOperations = reactiveCqlOperations;
this.entityOperations = new EntityOperations(converter.getMappingContext());
this.projectionFactory = new SpelAwareProxyProjectionFactory();
this.statementFactory = new StatementFactory(converter);
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#batchOps()
*/
@Override
public ReactiveCassandraBatchOperations batchOps() {
return new ReactiveCassandraBatchTemplate(this);
}
/* (non-Javadoc)
* @see org.springframework.context.ApplicationEventPublisherAware#setApplicationEventPublisher(org.springframework.context.ApplicationEventPublisher)
*/
@Override
public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
this.eventPublisher = applicationEventPublisher;
}
/* (non-Javadoc)
* @see org.springframework.context.ApplicationContextAware(org.springframework.context.ApplicationContext)
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
if (entityCallbacks == null) {
setEntityCallbacks(ReactiveEntityCallbacks.create(applicationContext));
}
projectionFactory.setBeanFactory(applicationContext);
projectionFactory.setBeanClassLoader(applicationContext.getClassLoader());
}
/**
* Configure {@link EntityCallbacks} to pre-/post-process entities during persistence operations.
*
* @param entityCallbacks
*/
public void setEntityCallbacks(@Nullable ReactiveEntityCallbacks entityCallbacks) {
this.entityCallbacks = entityCallbacks;
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#getReactiveCqlOperations()
*/
@Override
public ReactiveCqlOperations getReactiveCqlOperations() {
return this.cqlOperations;
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#getConverter()
*/
@Override
public CassandraConverter getConverter() {
return this.converter;
}
/**
* Returns whether this instance is configured to use {@link PreparedStatement prepared statements}. If enabled
* (default), then all persistence methods (such as {@link #select}, {@link #update}, and others) will make use of
* prepared statements. Note that methods accepting a {@link Statement} must be called with {@link SimpleStatement}
* instances to participate in statement preparation.
*
* @return {@literal true} if prepared statements usage is enabled; {@literal false} otherwise.
* @since 3.2
*/
public boolean isUsePreparedStatements() {
return usePreparedStatements;
}
/**
* Enable/disable {@link PreparedStatement prepared statements} usage. If enabled (default), then all persistence
* methods (such as {@link #select}, {@link #update}, and others) will make use of prepared statements. Note that
* methods accepting a {@link Statement} must be called with {@link SimpleStatement} instances to participate in
* statement preparation.
*
* @param usePreparedStatements whether to use prepared statements.
* @since 3.2
*/
public void setUsePreparedStatements(boolean usePreparedStatements) {
this.usePreparedStatements = usePreparedStatements;
}
/**
* Returns the {@link EntityOperations} used to perform data access operations on an entity inside a Cassandra data
* source.
*
* @return the configured {@link EntityOperations} for this template.
* @see org.springframework.data.cassandra.core.EntityOperations
*/
protected EntityOperations getEntityOperations() {
return this.entityOperations;
}
/**
* Returns a reference to the configured {@link ProjectionFactory} used by this template to process CQL query
* projections.
*
* @return a reference to the configured {@link ProjectionFactory} used by this template to process CQL query
* projections.
* @see org.springframework.data.projection.SpelAwareProxyProjectionFactory
* @since 2.1
*/
protected SpelAwareProxyProjectionFactory getProjectionFactory() {
return this.projectionFactory;
}
private CassandraPersistentEntity getRequiredPersistentEntity(Class entityType) {
return getEntityOperations().getRequiredPersistentEntity(entityType);
}
/**
* Returns the {@link StatementFactory} used by this template to construct and run Cassandra CQL statements.
*
* @return the {@link StatementFactory} used by this template to construct and run Cassandra CQL statements.
* @see org.springframework.data.cassandra.core.StatementFactory
* @since 2.1
*/
protected StatementFactory getStatementFactory() {
return this.statementFactory;
}
CqlIdentifier getTableName(Class entityClass) {
return getRequiredPersistentEntity(entityClass).getTableName();
}
// -------------------------------------------------------------------------
// Methods dealing with static CQL
// -------------------------------------------------------------------------
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#select(java.lang.String, java.lang.Class)
*/
@Override
public Flux select(String cql, Class entityClass) {
Assert.hasText(cql, "CQL must not be empty");
return select(SimpleStatement.newInstance(cql), entityClass);
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#selectOne(java.lang.String, java.lang.Class)
*/
@Override
public Mono selectOne(String cql, Class entityClass) {
return select(cql, entityClass).next();
}
// -------------------------------------------------------------------------
// Methods dealing with com.datastax.oss.driver.api.core.cql.Statement
// -------------------------------------------------------------------------
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#execute(com.datastax.oss.driver.api.core.cql.Statement)
*/
@Override
public Mono execute(Statement statement) throws DataAccessException {
Assert.notNull(statement, "Statement must not be null");
return doExecute(statement, Function.identity());
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#select(com.datastax.oss.driver.api.core.cql.Statement, java.lang.Class)
*/
@Override
public Flux select(Statement statement, Class entityClass) {
Assert.notNull(statement, "Statement must not be null");
Assert.notNull(entityClass, "Entity type must not be null");
Function mapper = getMapper(entityClass, entityClass, EntityQueryUtils.getTableName(statement));
return doQuery(statement, (row, rowNum) -> mapper.apply(row));
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#selectOne(com.datastax.oss.driver.api.core.cql.Statement, java.lang.Class)
*/
@Override
public Mono selectOne(Statement statement, Class entityClass) {
return select(statement, entityClass).next();
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.CassandraOperations#slice(com.datastax.oss.driver.api.core.cql.Statement, java.lang.Class)
*/
@Override
public Mono> slice(Statement statement, Class entityClass) {
Assert.notNull(statement, "Statement must not be null");
Assert.notNull(entityClass, "Entity type must not be null");
Mono resultSetMono = doExecute(statement, Function.identity());
Mono effectiveFetchSizeMono = getEffectiveFetchSize(statement);
RowMapper rowMapper = (row, i) -> getConverter().read(entityClass, row);
return resultSetMono.zipWith(effectiveFetchSizeMono).flatMap(tuple -> {
ReactiveResultSet resultSet = tuple.getT1();
Integer effectiveFetchSize = tuple.getT2();
return resultSet.availableRows().collectList().map(it -> EntityQueryUtils.readSlice(it,
resultSet.getExecutionInfo().getPagingState(), rowMapper, 1, effectiveFetchSize));
}).defaultIfEmpty(new SliceImpl<>(Collections.emptyList()));
}
// -------------------------------------------------------------------------
// Methods dealing with org.springframework.data.cassandra.core.query.Query
// -------------------------------------------------------------------------
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveCassandraOperations#select(org.springframework.data.cassandra.core.query.Query, java.lang.Class)
*/
@Override
public Flux select(Query query, Class entityClass) throws DataAccessException {
Assert.notNull(query, "Query must not be null");
Assert.notNull(entityClass, "Entity type must not be null");
return doSelect(query, entityClass, getTableName(entityClass), entityClass);
}
Flux doSelect(Query query, Class entityClass, CqlIdentifier tableName, Class returnType) {
CassandraPersistentEntity persistentEntity = getRequiredPersistentEntity(entityClass);
Columns columns = getStatementFactory().computeColumnsForProjection(query.getColumns(), persistentEntity,
returnType);
Query queryToUse = query.columns(columns);
StatementBuilder
