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Cassandra support for Spring Data
/*
* Copyright 2016-2022 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.repository.query;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import org.reactivestreams.Publisher;
import org.springframework.data.repository.util.ReactiveWrapperConverters;
import org.springframework.data.repository.util.ReactiveWrappers;
/**
* Reactive {@link org.springframework.data.repository.query.ParametersParameterAccessor} implementation that subscribes
* to reactive parameter wrapper types upon creation. This class performs synchronization when acessing parameters.
*
* @author Mark Paluch
* @since 2.0
*/
class ReactiveCassandraParameterAccessor extends CassandraParametersParameterAccessor {
private final Object[] values;
private final CassandraQueryMethod method;
ReactiveCassandraParameterAccessor(CassandraQueryMethod method, Object[] values) {
super(method, values);
this.method = method;
this.values = values;
}
@Override
public Object[] getValues() {
Object[] result = new Object[values.length];
for (int index = 0; index < result.length; index++) {
result[index] = getValue(index);
}
return result;
}
public Object getBindableValue(int index) {
return getValue(getParameters().getBindableParameter(index).getIndex());
}
/**
* Resolve parameters that were provided through reactive wrapper types. Flux is collected into a list, values from
* Mono's are used directly.
*
* @return
*/
@SuppressWarnings("unchecked")
public Mono resolveParameters() {
boolean hasReactiveWrapper = false;
for (Object value : values) {
if (value == null || !ReactiveWrappers.supports(value.getClass())) {
continue;
}
hasReactiveWrapper = true;
break;
}
if (!hasReactiveWrapper) {
return Mono.just(this);
}
Object[] resolved = new Object[values.length];
Map> holder = new ConcurrentHashMap<>();
List> publishers = new ArrayList<>();
for (int i = 0; i < values.length; i++) {
Object value = resolved[i] = values[i];
if (value == null || !ReactiveWrappers.supports(value.getClass())) {
continue;
}
if (ReactiveWrappers.isSingleValueType(value.getClass())) {
int index = i;
publishers.add(ReactiveWrapperConverters.toWrapper(value, Mono.class) //
.map(Optional::of) //
.defaultIfEmpty(Optional.empty()) //
.doOnNext(it -> holder.put(index, (Optional) it)));
} else {
int index = i;
publishers.add(ReactiveWrapperConverters.toWrapper(value, Flux.class) //
.collectList() //
.doOnNext(it -> holder.put(index, Optional.of(it))));
}
}
return Flux.merge(publishers).then().thenReturn(resolved).map(values -> {
holder.forEach((index, v) -> values[index] = v.orElse(null));
return new ReactiveCassandraParameterAccessor(method, values);
});
}
}