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   * 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.
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  package org.apache.beam.runners.extensions.metrics;
  
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.net.ServerSocket;
  import java.util.concurrent.CountDownLatch;
  import org.apache.beam.sdk.metrics.MetricQueryResults;
  import org.apache.beam.sdk.metrics.MetricsOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.junit.AfterClass;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  /** Test class for MetricsGraphiteSink. */
  public class MetricsGraphiteSinkTest {
    private static NetworkMockServer graphiteServer;
    private static int port;
  
    @BeforeClass
    public static void beforeClass() throws IOException, InterruptedException {
      // get free local port
      ServerSocket serverSocket = new ServerSocket(0);
      port = serverSocket.getLocalPort();
      serverSocket.close();
      graphiteServer = new NetworkMockServer(port);
      graphiteServer.clear();
      graphiteServer.start();
    }
  
    @Before
    public void before() {
      graphiteServer.clear();
    }
  
    @AfterClass
    public static void afterClass() throws IOException {
      graphiteServer.stop();
    }
  
    @Test
    public void testWriteMetricsWithCommittedSupported() throws Exception {
      MetricQueryResults metricQueryResults = new CustomMetricQueryResults(true);
      MetricsOptions pipelineOptions = PipelineOptionsFactory.create().as(MetricsOptions.class);
      pipelineOptions.setMetricsGraphitePort(port);
      pipelineOptions.setMetricsGraphiteHost("127.0.0.1");
      MetricsGraphiteSink metricsGraphiteSink = new MetricsGraphiteSink(pipelineOptions);
      CountDownLatch countDownLatch = new CountDownLatch(1);
      graphiteServer.setCountDownLatch(countDownLatch);
      metricsGraphiteSink.writeMetrics(metricQueryResults);
      countDownLatch.await();
      String join = String.join("\n", graphiteServer.getMessages());
      String regexpr =
          "beam.counter.ns1.n1.s1.committed.value 10 [0-9]+\\n"
              + "beam.counter.ns1.n1.s1.attempted.value 20 [0-9]+\\n"
              + "beam.gauge.ns1.n3.s3.committed.value 100 [0-9]+\\n"
              + "beam.gauge.ns1.n3.s3.attempted.value 120 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.committed.min 5 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.min 3 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.committed.max 8 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.max 9 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.committed.count 2 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.count 4 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.committed.sum 10 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.sum 25 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.committed.mean 5.0 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.mean 6.25 [0-9]+";
      assertTrue(join.matches(regexpr));
    }
  
    @Test
    public void testWriteMetricsWithCommittedUnSupported() throws Exception {
      MetricQueryResults metricQueryResults = new CustomMetricQueryResults(false);
      MetricsOptions pipelineOptions = PipelineOptionsFactory.create().as(MetricsOptions.class);
      pipelineOptions.setMetricsGraphitePort(port);
      pipelineOptions.setMetricsGraphiteHost("127.0.0.1");
      MetricsGraphiteSink metricsGraphiteSink = new MetricsGraphiteSink(pipelineOptions);
      CountDownLatch countDownLatch = new CountDownLatch(1);
      graphiteServer.setCountDownLatch(countDownLatch);
      metricsGraphiteSink.writeMetrics(metricQueryResults);
      countDownLatch.await();
      String join = String.join("\n", graphiteServer.getMessages());
      String regexpr =
          "beam.counter.ns1.n1.s1.attempted.value 20 [0-9]+\\n"
              + "beam.gauge.ns1.n3.s3.attempted.value 120 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.min 3 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.max 9 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.count 4 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.sum 25 [0-9]+\\n"
              + "beam.distribution.ns1.n2.s2.attempted.mean 6.25 [0-9]+";
      assertTrue(join.matches(regexpr));
    }
  }
  