/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.operation.projectors.fetch;

import com.carrotsearch.hppc.IntContainer;
import com.carrotsearch.hppc.IntObjectMap;
import io.crate.Streamer;
import io.crate.action.FutureActionListener;
import io.crate.data.Bucket;
import io.crate.executor.transport.NodeFetchRequest;
import io.crate.executor.transport.NodeFetchResponse;
import io.crate.executor.transport.TransportFetchNodeAction;

import java.util.Map;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;

public class TransportFetchOperation implements FetchOperation {

    private static final Function<NodeFetchResponse, IntObjectMap<? extends Bucket>> GET_FETCHED = NodeFetchResponse::fetched;
    private final TransportFetchNodeAction transportFetchNodeAction;
    private final Map<String, ? extends IntObjectMap<Streamer[]>> nodeIdToReaderIdToStreamers;
    private final UUID jobId;
    private final int executionPhaseId;

    public TransportFetchOperation(TransportFetchNodeAction transportFetchNodeAction,
                                   Map<String, ? extends IntObjectMap<Streamer[]>> nodeIdToReaderIdToStreamers,
                                   UUID jobId,
                                   int executionPhaseId) {
        this.transportFetchNodeAction = transportFetchNodeAction;
        this.nodeIdToReaderIdToStreamers = nodeIdToReaderIdToStreamers;
        this.jobId = jobId;
        this.executionPhaseId = executionPhaseId;
    }

    @Override
    public CompletableFuture<IntObjectMap<? extends Bucket>> fetch(String nodeId,
                                                                   IntObjectMap<? extends IntContainer> toFetch,
                                                                   boolean closeContext) {
        FutureActionListener<NodeFetchResponse, IntObjectMap<? extends Bucket>> listener = new FutureActionListener<>(GET_FETCHED);
        transportFetchNodeAction.execute(
            nodeId,
            nodeIdToReaderIdToStreamers.get(nodeId),
            new NodeFetchRequest(jobId, executionPhaseId, closeContext, toFetch),
            listener);
        return listener;
    }
}