/*
 * 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.dataflow.worker;

import static org.apache.beam.runners.dataflow.worker.counters.DataflowCounterUpdateExtractor.longToSplitInt;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.sameInstance;
import static org.junit.Assert.assertThat;

import com.google.api.services.dataflow.model.CounterMetadata;
import com.google.api.services.dataflow.model.CounterStructuredName;
import com.google.api.services.dataflow.model.CounterStructuredNameAndMetadata;
import com.google.api.services.dataflow.model.CounterUpdate;
import com.google.api.services.dataflow.model.DistributionUpdate;
import org.apache.beam.runners.dataflow.worker.MetricsToCounterUpdateConverter.Kind;
import org.apache.beam.runners.dataflow.worker.MetricsToCounterUpdateConverter.Origin;
import org.apache.beam.sdk.metrics.Distribution;
import org.apache.beam.sdk.metrics.MetricName;
import org.apache.beam.sdk.metrics.MetricsContainer;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link StreamingStepMetricsContainer}. */
@RunWith(JUnit4.class)
public class StreamingStepMetricsContainerTest {

  private MetricsContainerRegistry registry = StreamingStepMetricsContainer.createRegistry();

  private MetricsContainer c1 = registry.getContainer("s1");
  private MetricsContainer c2 = registry.getContainer("s2");

  private MetricName name1 = MetricName.named("ns", "name1");
  private MetricName name2 = MetricName.named("ns", "name2");

  @Test
  public void testDedupping() {
    assertThat(c1, not(sameInstance(c2)));
    assertThat(c1, sameInstance(registry.getContainer("s1")));
  }

  @Test
  public void testCounterUpdateExtraction() {
    c1.getCounter(name1).inc(5);
    c2.getCounter(name1).inc(8);
    c2.getCounter(name2).inc(12);

    Iterable<CounterUpdate> updates = StreamingStepMetricsContainer.extractMetricUpdates(registry);
    assertThat(
        updates,
        containsInAnyOrder(
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name1")
                                .setOriginalStepName("s1"))
                        .setMetadata(new CounterMetadata().setKind(Kind.SUM.toString())))
                .setCumulative(false)
                .setInteger(longToSplitInt(5)),
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name1")
                                .setOriginalStepName("s2"))
                        .setMetadata(new CounterMetadata().setKind(Kind.SUM.toString())))
                .setCumulative(false)
                .setInteger(longToSplitInt(8)),
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name2")
                                .setOriginalStepName("s2"))
                        .setMetadata(new CounterMetadata().setKind(Kind.SUM.toString())))
                .setCumulative(false)
                .setInteger(longToSplitInt(12))));

    c2.getCounter(name1).inc(7);

    updates = StreamingStepMetricsContainer.extractMetricUpdates(registry);
    assertThat(
        updates,
        containsInAnyOrder(
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name1")
                                .setOriginalStepName("s2"))
                        .setMetadata(new CounterMetadata().setKind(Kind.SUM.toString())))
                .setCumulative(false)
                .setInteger(longToSplitInt(7))));
  }

  @Test
  public void testDistributionUpdateExtraction() {
    Distribution distribution = c1.getDistribution(name1);
    distribution.update(5);
    distribution.update(6);
    distribution.update(7);

    Iterable<CounterUpdate> updates = StreamingStepMetricsContainer.extractMetricUpdates(registry);
    assertThat(
        updates,
        containsInAnyOrder(
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name1")
                                .setOriginalStepName("s1"))
                        .setMetadata(new CounterMetadata().setKind(Kind.DISTRIBUTION.toString())))
                .setCumulative(false)
                .setDistribution(
                    new DistributionUpdate()
                        .setCount(longToSplitInt(3))
                        .setMax(longToSplitInt(7))
                        .setMin(longToSplitInt(5))
                        .setSum(longToSplitInt(18)))));

    c1.getDistribution(name1).update(3);

    updates = StreamingStepMetricsContainer.extractMetricUpdates(registry);
    assertThat(
        updates,
        containsInAnyOrder(
            new CounterUpdate()
                .setStructuredNameAndMetadata(
                    new CounterStructuredNameAndMetadata()
                        .setName(
                            new CounterStructuredName()
                                .setOrigin(Origin.USER.toString())
                                .setOriginNamespace("ns")
                                .setName("name1")
                                .setOriginalStepName("s1"))
                        .setMetadata(new CounterMetadata().setKind(Kind.DISTRIBUTION.toString())))
                .setCumulative(false)
                .setDistribution(
                    new DistributionUpdate()
                        .setCount(longToSplitInt(1))
                        .setMax(longToSplitInt(3))
                        .setMin(longToSplitInt(3))
                        .setSum(longToSplitInt(3)))));
  }
}
