| /* |
| * 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.fn.harness.data; |
| |
| import java.io.Closeable; |
| import java.util.HashMap; |
| import org.apache.beam.runners.core.metrics.LabeledMetrics; |
| import org.apache.beam.runners.core.metrics.MetricsContainerStepMap; |
| import org.apache.beam.runners.core.metrics.MonitoringInfoConstants; |
| import org.apache.beam.runners.core.metrics.MonitoringInfoConstants.Labels; |
| import org.apache.beam.runners.core.metrics.MonitoringInfoMetricName; |
| import org.apache.beam.sdk.fn.data.FnDataReceiver; |
| import org.apache.beam.sdk.metrics.Counter; |
| import org.apache.beam.sdk.metrics.MetricsContainer; |
| import org.apache.beam.sdk.metrics.MetricsEnvironment; |
| import org.apache.beam.sdk.util.WindowedValue; |
| |
| /** |
| * A wrapping {@code FnDataReceiver<WindowedValue<T>>} which counts the number of elements consumed |
| * by the original {@code FnDataReceiver<WindowedValue<T>>}. |
| * |
| * @param <T> - The receiving type of the PTransform. |
| */ |
| public class ElementCountFnDataReceiver<T> implements FnDataReceiver<WindowedValue<T>> { |
| |
| private FnDataReceiver<WindowedValue<T>> original; |
| private Counter counter; |
| private MetricsContainer unboundMetricContainer; |
| |
| public ElementCountFnDataReceiver( |
| FnDataReceiver<WindowedValue<T>> original, |
| String pCollection, |
| MetricsContainerStepMap metricContainerRegistry) { |
| this.original = original; |
| HashMap<String, String> labels = new HashMap<String, String>(); |
| labels.put(Labels.PCOLLECTION, pCollection); |
| MonitoringInfoMetricName metricName = |
| MonitoringInfoMetricName.named(MonitoringInfoConstants.Urns.ELEMENT_COUNT, labels); |
| this.counter = LabeledMetrics.counter(metricName); |
| // Collect the metric in a metric container which is not bound to the step name. |
| // This is required to count elements from impulse steps, which will produce elements outside |
| // of a pTransform context. |
| this.unboundMetricContainer = metricContainerRegistry.getUnboundContainer(); |
| } |
| |
| @Override |
| public void accept(WindowedValue<T> input) throws Exception { |
| try (Closeable close = MetricsEnvironment.scopedMetricsContainer(this.unboundMetricContainer)) { |
| // Increment the counter for each window the element occurs in. |
| this.counter.inc(input.getWindows().size()); |
| this.original.accept(input); |
| } |
| } |
| } |