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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 */

package org.apache.flink.runtime.executiongraph;

import org.apache.flink.runtime.jobgraph.IntermediateResultPartitionID;
import org.apache.flink.runtime.scheduler.strategy.ConsumedPartitionGroup;
import org.apache.flink.runtime.scheduler.strategy.ConsumerVertexGroup;
import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.apache.flink.util.Preconditions.checkNotNull;
import static org.apache.flink.util.Preconditions.checkState;

/** Class that manages all the connections between tasks. */
public class EdgeManager {

    private final Map> partitionConsumers =
            new HashMap<>();

    private final Map> vertexConsumedPartitions =
            new HashMap<>();

    public void connectPartitionWithConsumerVertexGroup(
            IntermediateResultPartitionID resultPartitionId,
            ConsumerVertexGroup consumerVertexGroup) {

        checkNotNull(consumerVertexGroup);

        final List consumers =
                getConsumerVertexGroupsForPartitionInternal(resultPartitionId);

        // sanity check
        checkState(
                consumers.isEmpty(), "Currently there has to be exactly one consumer in real jobs");

        consumers.add(consumerVertexGroup);
    }

    public void connectVertexWithConsumedPartitionGroup(
            ExecutionVertexID executionVertexId, ConsumedPartitionGroup consumedPartitionGroup) {

        checkNotNull(consumedPartitionGroup);

        final List consumedPartitions =
                getConsumedPartitionGroupsForVertexInternal(executionVertexId);

        consumedPartitions.add(consumedPartitionGroup);
    }

    private List getConsumerVertexGroupsForPartitionInternal(
            IntermediateResultPartitionID resultPartitionId) {
        return partitionConsumers.computeIfAbsent(resultPartitionId, id -> new ArrayList<>());
    }

    private List getConsumedPartitionGroupsForVertexInternal(
            ExecutionVertexID executionVertexId) {
        return vertexConsumedPartitions.computeIfAbsent(executionVertexId, id -> new ArrayList<>());
    }

    public List getConsumerVertexGroupsForPartition(
            IntermediateResultPartitionID resultPartitionId) {
        return Collections.unmodifiableList(
                getConsumerVertexGroupsForPartitionInternal(resultPartitionId));
    }

    public List getConsumedPartitionGroupsForVertex(
            ExecutionVertexID executionVertexId) {
        return Collections.unmodifiableList(
                getConsumedPartitionGroupsForVertexInternal(executionVertexId));
    }
}