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• 1.2.6
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• ReduceMain.java

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tech.ytsaurus.client.operations.ReduceMain Maven / Gradle / Ivy

package tech.ytsaurus.client.operations;

import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;

import tech.ytsaurus.core.operations.OperationContext;
import tech.ytsaurus.core.operations.Yield;
import tech.ytsaurus.lang.NonNullApi;
import tech.ytsaurus.lang.NonNullFields;

@NonNullApi
@NonNullFields
public class ReduceMain {
    private ReduceMain() {
    }

    public static void main(String[] args) throws Exception {
        YtMainUtils.setTempDir();
        YtMainUtils.disableSystemOutput();
        OutputStream[] output = YtMainUtils.buildOutputStreams(args);

        Reducer reducer = (Reducer) YtMainUtils.construct(args);

        try {
            applyReducer(reducer, System.in, output, new StatisticsImpl());
        } catch (Throwable e) {
            e.printStackTrace(System.err);
            System.exit(2);
        } finally {
            System.exit(0);
        }
    }

    public static  void applyReducer(Reducer reducer, InputStream in,
                                           OutputStream[] output, Statistics statistics) throws Exception {
        YTableEntryType inputType = reducer.inputType();
        YTableEntryType outputType = reducer.outputType();

        try (statistics; Yield yield = outputType.yield(output)) {
            OperationContext context = new OperationContext();
            Iterator it = inputType.iterator(in, context);
            reducer.start(yield, statistics);
            reducer.reduce(it, yield, statistics, context);
            it.forEachRemaining(tmp -> {
            });
            reducer.finish(yield, statistics);
        }
    }
}