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Cassandra support for Spring Data
/*
* Copyright 2018-2020 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 lombok.AccessLevel;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.experimental.FieldDefaults;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.dao.IncorrectResultSizeDataAccessException;
import org.springframework.data.cassandra.core.query.Query;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import com.datastax.oss.driver.api.core.CqlIdentifier;
/**
* Implementation of {@link ReactiveSelectOperation}.
*
* @author Mark Paluch
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation
* @see org.springframework.data.cassandra.core.query.Query
* @since 2.1
*/
@RequiredArgsConstructor
class ReactiveSelectOperationSupport implements ReactiveSelectOperation {
private final @NonNull ReactiveCassandraTemplate template;
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation#query(java.lang.Class)
*/
@Override
public ReactiveSelect query(Class domainType) {
Assert.notNull(domainType, "DomainType must not be null");
return new ReactiveSelectSupport<>(this.template, domainType, domainType, Query.empty(), null);
}
@RequiredArgsConstructor
@FieldDefaults(level = AccessLevel.PRIVATE, makeFinal = true)
static class ReactiveSelectSupport implements ReactiveSelect {
@NonNull ReactiveCassandraTemplate template;
@NonNull Class domainType;
@NonNull Class returnType;
@NonNull Query query;
@Nullable CqlIdentifier tableName;
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.SelectWithTable#inTable(org.springframework.data.cassandra.core.cql.CqlIdentifier)
*/
@Override
public SelectWithProjection inTable(CqlIdentifier tableName) {
Assert.notNull(tableName, "Table name must not be null");
return new ReactiveSelectSupport<>(this.template, this.domainType, this.returnType, this.query, tableName);
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.SelectWithProjection#as(java.lang.Class)
*/
@Override
public SelectWithQuery as(Class returnType) {
Assert.notNull(returnType, "ReturnType must not be null");
return new ReactiveSelectSupport<>(this.template, this.domainType, returnType, this.query, this.tableName);
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.SelectWithQuery#matching(org.springframework.data.cassandra.core.query.Query)
*/
@Override
public TerminatingSelect matching(Query query) {
Assert.notNull(query, "Query must not be null");
return new ReactiveSelectSupport<>(this.template, this.domainType, this.returnType, query, this.tableName);
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.TerminatingSelect#count()
*/
@Override
public Mono count() {
return this.template.doCount(this.query, this.domainType, getTableName());
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.TerminatingSelect#exists()
*/
@Override
public Mono exists() {
return this.template.doExists(this.query, this.domainType, getTableName());
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.TerminatingSelect#first()
*/
@Override
public Mono first() {
return this.template.doSelect(this.query.limit(1), this.domainType, getTableName(), this.returnType).next();
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.TerminatingSelect#one()
*/
@Override
public Mono one() {
Flux result = this.template.doSelect(this.query.limit(2), this.domainType, getTableName(), this.returnType);
return result.collectList() //
.flatMap(it -> {
if (it.isEmpty()) {
return Mono.empty();
}
if (it.size() > 1) {
return Mono.error(new IncorrectResultSizeDataAccessException(
String.format("Query [%s] returned non unique result.", this.query), 1));
}
return Mono.just(it.get(0));
});
}
/* (non-Javadoc)
* @see org.springframework.data.cassandra.core.ReactiveSelectOperation.TerminatingSelect#all()
*/
@Override
public Flux all() {
return this.template.doSelect(this.query, this.domainType, getTableName(), this.returnType);
}
private CqlIdentifier getTableName() {
return this.tableName != null ? this.tableName : this.template.getTableName(this.domainType);
}
}
}