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• fun.bigtable
• kraken-core
• 1.0.2
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• StreamUtils.java

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fun.bigtable.kraken.util.StreamUtils Maven / Gradle / Ivy

package fun.bigtable.kraken.util;

import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;

public class StreamUtils {

    public static  Predicate distinctByKey(Function keyExtractor) {
        ConcurrentHashMap map = new ConcurrentHashMap<>(16);
        return t -> map.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
    }

}