/
Backend.java
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/
Backend.java
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/*
* Copyright 2019 Immutables Authors and Contributors
*
* 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
*
* http://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.immutables.criteria.internal;
import org.reactivestreams.Publisher;
/**
* Abstraction of a asynchronous service used by adapters and modeled as a single abstract method (SAM).
*/
public interface Backend {
/**
* Apply an operation on the back-end. {@code operation} in this context can mean query / update
* / insert / index etc.
*
* <p>Produced publisher can represent empty, single, multiple or unbounded event flow.
*
* @param operation operation to be performed on the back-end.
* @return empty, single, multiple or unbounded event flow
*/
<T> Publisher<T> execute(Operation<T> operation);
/**
* Generic operation to be executed on the back-end. Typical operations include
* query, update, delete etc.
*/
interface Operation<T> {
}
}