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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,
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 * See the License for the specific language governing permissions and
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 */

package org.apache.flink.runtime.scheduler.adaptivebatch;

import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.runtime.executiongraph.IOMetrics;
import org.apache.flink.runtime.executiongraph.IntermediateResult;
import org.apache.flink.runtime.executiongraph.IntermediateResultPartition;

import java.util.ArrayList;
import java.util.List;

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

/** The blocking result info, which will be used to calculate the vertex parallelism. */
public class BlockingResultInfo {

    private final List blockingPartitionSizes;

    private final boolean isBroadcast;

    private BlockingResultInfo(List blockingPartitionSizes, boolean isBroadcast) {
        this.blockingPartitionSizes = blockingPartitionSizes;
        this.isBroadcast = isBroadcast;
    }

    public List getBlockingPartitionSizes() {
        return blockingPartitionSizes;
    }

    public boolean isBroadcast() {
        return isBroadcast;
    }

    @VisibleForTesting
    static BlockingResultInfo createFromBroadcastResult(List blockingPartitionSizes) {
        return new BlockingResultInfo(blockingPartitionSizes, true);
    }

    @VisibleForTesting
    static BlockingResultInfo createFromNonBroadcastResult(List blockingPartitionSizes) {
        return new BlockingResultInfo(blockingPartitionSizes, false);
    }

    public static BlockingResultInfo createFromIntermediateResult(
            IntermediateResult intermediateResult) {
        checkArgument(intermediateResult != null);

        List blockingPartitionSizes = new ArrayList<>();
        for (IntermediateResultPartition partition : intermediateResult.getPartitions()) {
            checkState(partition.isConsumable());

            IOMetrics ioMetrics =
                    partition.getProducer().getCurrentExecutionAttempt().getIOMetrics();
            checkNotNull(ioMetrics, "IOMetrics should not be null.");

            blockingPartitionSizes.add(
                    ioMetrics.getNumBytesProducedOfPartitions().get(partition.getPartitionId()));
        }

        return new BlockingResultInfo(blockingPartitionSizes, intermediateResult.isBroadcast());
    }
}