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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.streaming.runtime.operators.sink;

import org.apache.flink.api.connector.sink.GlobalCommitter;
import org.apache.flink.streaming.api.operators.AbstractStreamOperator;
import org.apache.flink.streaming.api.operators.BoundedOneInput;
import org.apache.flink.streaming.api.operators.OneInputStreamOperator;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;

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

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

/**
 * Runtime {@link org.apache.flink.streaming.api.operators.StreamOperator} for executing {@link
 * GlobalCommitter} in the batch execution mode.
 *
 * @param  The committable type of the {@link GlobalCommitter}
 * @param  The committable type of the {@link GlobalCommitter}
 */
final class BatchGlobalCommitterOperator
        extends AbstractStreamOperator
        implements OneInputStreamOperator, BoundedOneInput {

    /**
     * Aggregate committables to global committables and commit the global committables to the
     * external system.
     */
    private final GlobalCommitter globalCommitter;

    /** Record all the committables until the end of the input. */
    private final List allCommittables;

    BatchGlobalCommitterOperator(GlobalCommitter globalCommitter) {
        this.globalCommitter = checkNotNull(globalCommitter);
        this.allCommittables = new ArrayList<>();
    }

    @Override
    public void processElement(StreamRecord element) {
        allCommittables.add(element.getValue());
    }

    @Override
    public void endInput() throws Exception {
        if (!allCommittables.isEmpty()) {
            final GlobalCommT globalCommittable = globalCommitter.combine(allCommittables);
            final List neededRetryCommittables =
                    globalCommitter.commit(Collections.singletonList(globalCommittable));
            if (!neededRetryCommittables.isEmpty()) {
                throw new UnsupportedOperationException(
                        "Currently does not support the re-commit!");
            }
        }
        globalCommitter.endOfInput();
    }

    @Override
    public void close() throws Exception {
        super.close();
        globalCommitter.close();
    }
}