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The core components for a Trellis linked data server

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/*
 * Copyright (c) 2021 Aaron Coburn and individual 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.trellisldp.api;

import java.util.concurrent.CompletionStage;

import org.apache.commons.rdf.api.IRI;

/**
 * A service that can retrieve resources of some type, featuring optional
 * retrieval by time.
 *
 * @author ajs6f
 * @param  the type of resource available from this service
 */
public interface RetrievalService {

    /**
     * Get a resource by the given identifier.
     *
     * @param identifier the resource identifier
     * @return the resource
     */
    CompletionStage get(IRI identifier);
}