flink-kubernetes-operator-autoscaler/src/main/java/org/apache/flink/kubernetes/operator/autoscaler/metrics/FlinkMetric.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.flink.kubernetes.operator.autoscaler.metrics;

import org.apache.flink.runtime.rest.messages.job.metrics.AggregatedMetric;

import java.util.Collection;
import java.util.Optional;
import java.util.function.Predicate;

/**
 * Enum representing the collected Flink metrics for autoscaling. The actual metric names depend on
 * the JobGraph.
 */
public enum FlinkMetric {
    BUSY_TIME_PER_SEC(s -> s.equals("busyTimeMsPerSecond")),
    NUM_RECORDS_IN_PER_SEC(s -> s.equals("numRecordsInPerSecond")),
    NUM_RECORDS_OUT_PER_SEC(s -> s.equals("numRecordsOutPerSecond")),
    SOURCE_TASK_NUM_RECORDS_OUT_PER_SEC(
            s -> s.startsWith("Source__") && s.endsWith(".numRecordsOutPerSecond")),
    SOURCE_TASK_NUM_RECORDS_IN_PER_SEC(
            s -> s.startsWith("Source__") && s.endsWith(".numRecordsInPerSecond")),
    PENDING_RECORDS(s -> s.endsWith(".pendingRecords"));

    FlinkMetric(Predicate<String> predicate) {
        this.predicate = predicate;
    }

    public final Predicate<String> predicate;

    public Optional<String> findAny(Collection<AggregatedMetric> metrics) {
        return metrics.stream().map(AggregatedMetric::getId).filter(predicate).findAny();
    }
}