nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/controller/status/history/questdb/QuestDbStatusSnapshotMapper.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.nifi.controller.status.history.questdb;

import io.questdb.cairo.sql.Record;
import org.apache.nifi.controller.status.history.MetricDescriptor;
import org.apache.nifi.controller.status.history.StandardStatusSnapshot;

import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

public class QuestDbStatusSnapshotMapper<T> implements Function<Record, StandardStatusSnapshot> {
    private final Map<Integer, MetricDescriptor<T>> metrics = new HashMap<>();

    public QuestDbStatusSnapshotMapper(final Map<Integer, MetricDescriptor<T>> metrics) {
        this.metrics.putAll(metrics);
    }

    @Override
    public StandardStatusSnapshot apply(final Record record) {
        final StandardStatusSnapshot snapshot = new StandardStatusSnapshot(new HashSet<>(metrics.values()));
        snapshot.setTimestamp(new Date(TimeUnit.MICROSECONDS.toMillis(record.getTimestamp(0))));
        metrics.keySet().forEach(ordinal -> snapshot.addStatusMetric(metrics.get(ordinal), record.getLong(ordinal)));
        return snapshot;
    }
}