| /* |
| * 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.beam.runners.spark.structuredstreaming.metrics; |
| |
| import com.codahale.metrics.Gauge; |
| import com.codahale.metrics.MetricFilter; |
| import java.util.Map; |
| import org.apache.beam.runners.spark.metrics.WithMetricsSupport; |
| |
| /** |
| * {@link BeamMetricSet} is a {@link Gauge} that returns a map of multiple metrics which get |
| * flattened in {@link WithMetricsSupport#getGauges()} for usage in {@link |
| * org.apache.spark.metrics.sink.Sink Spark metric sinks}. |
| * |
| * <p>Note: Recent versions of Dropwizard {@link com.codahale.metrics.MetricRegistry MetricRegistry} |
| * do not allow registering arbitrary implementations of {@link com.codahale.metrics.Metric Metrics} |
| * and require usage of {@link Gauge} here. |
| */ |
| // TODO: turn into MetricRegistry https://github.com/apache/beam/issues/22384 |
| abstract class BeamMetricSet implements Gauge<Map<String, Gauge<Double>>> { |
| |
| @Override |
| public final Map<String, Gauge<Double>> getValue() { |
| return getValue("", MetricFilter.ALL); |
| } |
| |
| protected abstract Map<String, Gauge<Double>> getValue(String prefix, MetricFilter filter); |
| |
| protected Gauge<Double> staticGauge(Number number) { |
| return new ConstantGauge(number.doubleValue()); |
| } |
| |
| private static class ConstantGauge implements Gauge<Double> { |
| private final double value; |
| |
| ConstantGauge(double value) { |
| this.value = value; |
| } |
| |
| @Override |
| public Double getValue() { |
| return value; |
| } |
| } |
| } |