Example usage for java.util.stream Collectors summarizingLong

Introduction

In this page you can find the example usage for java.util.stream Collectors summarizingLong.

Prototype

public static <T> Collector<T, ?, LongSummaryStatistics> summarizingLong(ToLongFunction<? super T> mapper) 

Source Link

Document

Returns a Collector which applies an long -producing mapping function to each input element, and returns summary statistics for the resulting values.

Usage

From source file:Main.java

public static void main(String[] args) {
    LongSummaryStatistics incomeStats = Employee.persons().stream()
            .collect(Collectors.summarizingLong(Employee::getIncome));
    System.out.println(incomeStats);
}

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From source file:org.apache.metron.profiler.storm.ProfileBuilderBolt.java

/**
 * Logs information about the {@link TupleWindow}.
 *
 * @param window The tuple window.//  w w w.java  2  s.co m
 */
private void log(TupleWindow window) {
    // summarize the newly received tuples
    LongSummaryStatistics received = window.get().stream()
            .map(tuple -> getField(TIMESTAMP_TUPLE_FIELD, tuple, Long.class))
            .collect(Collectors.summarizingLong(Long::longValue));

    LOG.debug("Tuple(s) received; count={}, min={}, max={}, range={} ms", received.getCount(),
            received.getMin(), received.getMax(), received.getMax() - received.getMin());

    if (window.getExpired().size() > 0) {
        // summarize the expired tuples
        LongSummaryStatistics expired = window.getExpired().stream()
                .map(tuple -> getField(TIMESTAMP_TUPLE_FIELD, tuple, Long.class))
                .collect(Collectors.summarizingLong(Long::longValue));

        LOG.debug("Tuple(s) expired; count={}, min={}, max={}, range={} ms, lag={} ms", expired.getCount(),
                expired.getMin(), expired.getMax(), expired.getMax() - expired.getMin(),
                received.getMin() - expired.getMin());
    }
}

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From source file:org.apache.nifi.cluster.coordination.http.replication.ThreadPoolRequestReplicator.java

private void logTimingInfo(final AsyncClusterResponse response) {
    // Calculate min, max, mean for the requests
    final LongSummaryStatistics stats = response.getNodesInvolved().stream()
            .map(p -> response.getNodeResponse(p).getRequestDuration(TimeUnit.MILLISECONDS))
            .collect(Collectors.summarizingLong(Long::longValue));

    final StringBuilder sb = new StringBuilder();
    sb.append("Node Responses for ").append(response.getMethod()).append(" ").append(response.getURIPath())
            .append(" (Request ID ").append(response.getRequestIdentifier()).append("):\n");
    for (final NodeIdentifier node : response.getNodesInvolved()) {
        sb.append(node).append(": ")
                .append(response.getNodeResponse(node).getRequestDuration(TimeUnit.MILLISECONDS))
                .append(" millis\n");
    }// w ww  .  ja  v a 2s.  co  m

    logger.debug("For {} {} (Request ID {}), minimum response time = {}, max = {}, average = {} ms",
            response.getMethod(), response.getURIPath(), response.getRequestIdentifier(), stats.getMin(),
            stats.getMax(), stats.getAverage());
    logger.debug(sb.toString());
}

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