/*
 * Copyright 2020-2021 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.spel.spi;

import reactor.core.publisher.Mono;

import org.springframework.expression.EvaluationContext;

SPI to resolve a EvaluationContextExtension to make it accessible via the root of an EvaluationContext provided by a ExtensionAwareQueryMethodEvaluationContextProvider. 
 Extensions can be ordered by following Spring's Ordered conventions. 
Author:
Mark Paluch
See Also:
EvaluationContextExtension
Ordered
Order
Since:
2.4/**
 * SPI to resolve a {@link EvaluationContextExtension} to make it accessible via the root of an
 * {@link EvaluationContext} provided by a
 * {@link org.springframework.data.repository.query.ExtensionAwareQueryMethodEvaluationContextProvider}.
 * <p>
 * Extensions can be ordered by following Spring's {@link org.springframework.core.Ordered} conventions.
 *
 * @author Mark Paluch
 * @since 2.4
 * @see EvaluationContextExtension
 * @see org.springframework.core.Ordered
 * @see org.springframework.core.annotation.Order
 */
public interface ReactiveEvaluationContextExtension extends ExtensionIdAware {

	
Return the EvaluationContextExtension to be consumed during the actual execution. It's strongly recommended to declare the most concrete type possible as return type of the implementation method. This will allow us to obtain the necessary metadata once and not for every evaluation. 
Returns:
the resolved EvaluationContextExtension. Publishers emitting no value will be skipped./**
	 * Return the {@link EvaluationContextExtension} to be consumed during the actual execution. It's strongly recommended
	 * to declare the most concrete type possible as return type of the implementation method. This will allow us to
	 * obtain the necessary metadata once and not for every evaluation.
	 *
	 * @return the resolved {@link EvaluationContextExtension}. Publishers emitting no value will be skipped.
	 */
	Mono<? extends EvaluationContextExtension> getExtension();
}