node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/MetricsDb.java


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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.autoscale;

import com.yahoo.collections.Pair;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeList;
import com.yahoo.vespa.hosted.provision.NodeRepository;

import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * An in-memory time-series database of node metrics.
 *
 * @author bratseth
 */
public interface MetricsDb {

    /** Adds snapshots to this. */
    void add(Collection<Pair<String, MetricSnapshot>> nodeMetrics);

    /**
     * Returns a list with one entry for each hostname containing
     * the snapshots recorded after the given time (or an empty snapshot if none).
     *
     * @param period the duration into the past to return data for
     */
    List<NodeTimeseries> getNodeTimeseries(Duration period, Set<String> hostnames);

    default List<NodeTimeseries> getNodeTimeseries(Duration period, NodeList nodes) {
        return getNodeTimeseries(period, nodes.stream().map(Node::hostname).collect(Collectors.toSet()));
    }

    /** Must be called intermittently (as long as add is called) to gc old data */
    void gc();

    void close();

    static MetricsDb createTestInstance(NodeRepository nodeRepository) {
        return new MemoryMetricsDb(nodeRepository);
    }

}