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AsyncTraverser.java
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41 lines (37 loc) · 1.46 KB
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/*
* Copyright (c) 2018, Fernando Miguel Carvalho, mcarvalho@cc.isel.ipl.pt
*
* 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.jayield;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiConsumer;
import static java.util.concurrent.CompletableFuture.supplyAsync;
/**
* Asynchronous traversal.
* Jayield uses traverse method as its first choice to
* implement AsyncQuery operations.
* This is a special kind of traversal that disallows individually access.
*/
public interface AsyncTraverser<T> {
/**
* Yields elements sequentially until all elements have been
* processed or an exception is thrown.
* The given consumer is invoked with the result (or null if none)
* and the exception (or null if none).
*
* @return A CompletableFuture to signal finish to enable cancellation
* through its cancel() method.
*/
CompletableFuture<Void> subscribe(BiConsumer<? super T,? super Throwable> cons);
}