Example usage for java.util.concurrent ConcurrentHashMap reduceEntries

Introduction

In this page you can find the example usage for java.util.concurrent ConcurrentHashMap reduceEntries.

Prototype

public Map.Entry<K, V> reduceEntries(long parallelismThreshold,
        BiFunction<Map.Entry<K, V>, Map.Entry<K, V>, ? extends Map.Entry<K, V>> reducer) 

Source Link

Document

Returns the result of accumulating all entries using the given reducer to combine values, or null if none.

Usage

From source file:Main.java

public static <K, V extends Comparable> K getKeyOfMaxValue(ConcurrentHashMap<K, V> map) {
    Map.Entry<K, V> entry = map.reduceEntries(1000, (oldEntry, newEntry) -> {
        if (oldEntry.getValue().compareTo(newEntry.getValue()) > 0)
            return oldEntry;
        else/*w w w  .j av a 2 s .c om*/
            return newEntry;
    });
    return entry.getKey();
}

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