content: /*
   * 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 com.alibaba.metrics.reporter;
  
  import com.alibaba.metrics.Clock;
  import com.alibaba.metrics.Counter;
  import com.alibaba.metrics.Gauge;
  import com.alibaba.metrics.Histogram;
  import com.alibaba.metrics.Meter;
  import com.alibaba.metrics.MetricFilter;
  import com.alibaba.metrics.MetricName;
  import com.alibaba.metrics.MetricRegistry;
  import com.alibaba.metrics.Snapshot;
  import com.alibaba.metrics.Timer;
  import org.assertj.core.api.Assertions;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.nio.CharBuffer;
  import java.util.Locale;
  import java.util.SortedMap;
  import java.util.TreeMap;
  import java.util.concurrent.TimeUnit;
  
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  public class CsvReporterTest {
      @Rule public final TemporaryFolder folder = new TemporaryFolder();
  
      private final MetricRegistry registry = mock(MetricRegistry.class);
      private final Clock clock = mock(Clock.class);
  
      private File dataDirectory;
      private CsvReporter reporter;
  
      @Before
      public void setUp() throws Exception {
          when(clock.getTime()).thenReturn(19910191000L);
  
          this.dataDirectory = folder.newFolder();
  
          this.reporter = CsvReporter.forRegistry(registry)
                  .formatFor(Locale.US)
                  .convertRatesTo(TimeUnit.SECONDS)
                  .convertDurationsTo(TimeUnit.MILLISECONDS)
                  .withClock(clock)
                  .filter(MetricFilter.ALL)
                  .build(dataDirectory);
      }
  
      @Test
      public void reportsGaugeValues() throws Exception {
          final Gauge gauge = mock(Gauge.class);
          when(gauge.getValue()).thenReturn(1);
  
          reporter.report(map("gauge", gauge),
                  this.<Counter>map(),
                  this.<Histogram>map(),
                  this.<Meter>map(),
                  this.<Timer>map());
  
          Assertions.assertThat(fileContents("gauge.csv"))
                  .isEqualTo(csv(
                          "t,value",
                          "19910191,1"
                  ));
      }
  
      @Test
      public void reportsCounterValues() throws Exception {
          final Counter counter = mock(Counter.class);
          when(counter.getCount()).thenReturn(100L);
  
          reporter.report(this.<Gauge>map(),
                  map("test.counter", counter),
                  this.<Histogram>map(),
                  this.<Meter>map(),
                  this.<Timer>map());
  
          Assertions.assertThat(fileContents("test.counter.csv"))
                  .isEqualTo(csv(
                          "t,count",
                          "19910191,100"
                  ));
      }
  
      @Test
      public void reportsHistogramValues() throws Exception {
          final Histogram histogram = mock(Histogram.class);
          when(histogram.getCount()).thenReturn(1L);
  
          final Snapshot snapshot = mock(Snapshot.class);
          when(snapshot.getMax()).thenReturn(2L);
          when(snapshot.getMean()).thenReturn(3.0);
          when(snapshot.getMin()).thenReturn(4L);
          when(snapshot.getStdDev()).thenReturn(5.0);
          when(snapshot.getMedian()).thenReturn(6.0);
          when(snapshot.get75thPercentile()).thenReturn(7.0);
          when(snapshot.get95thPercentile()).thenReturn(8.0);
          when(snapshot.get98thPercentile()).thenReturn(9.0);
          when(snapshot.get99thPercentile()).thenReturn(10.0);
          when(snapshot.get999thPercentile()).thenReturn(11.0);
  
          when(histogram.getSnapshot()).thenReturn(snapshot);
  
          reporter.report(this.<Gauge>map(),
                  this.<Counter>map(),
                  map("test.histogram", histogram),
                  this.<Meter>map(),
                  this.<Timer>map());
  
          Assertions.assertThat(fileContents("test.histogram.csv"))
                  .isEqualTo(csv(
                          "t,count,max,mean,min,stddev,p50,p75,p95,p98,p99,p999",
                          "19910191,1,2,3.000000,4,5.000000,6.000000,7.000000,8.000000,9.000000,10.000000,11.000000"
                  ));
      }
  
      @Test
      public void reportsMeterValues() throws Exception {
          final Meter meter = mock(Meter.class);
          when(meter.getCount()).thenReturn(1L);
          when(meter.getMeanRate()).thenReturn(2.0);
          when(meter.getOneMinuteRate()).thenReturn(3.0);
          when(meter.getFiveMinuteRate()).thenReturn(4.0);
          when(meter.getFifteenMinuteRate()).thenReturn(5.0);
  
          reporter.report(this.<Gauge>map(),
                  this.<Counter>map(),
                  this.<Histogram>map(),
                  map("test.meter", meter),
                  this.<Timer>map());
  
          Assertions.assertThat(fileContents("test.meter.csv"))
                  .isEqualTo(csv(
                          "t,count,mean_rate,m1_rate,m5_rate,m15_rate,rate_unit",
                          "19910191,1,2.000000,3.000000,4.000000,5.000000,events/second"
                  ));
      }
  
      @Test
      public void reportsTimerValues() throws Exception {
          final Timer timer = mock(Timer.class);
          when(timer.getCount()).thenReturn(1L);
          when(timer.getMeanRate()).thenReturn(2.0);
          when(timer.getOneMinuteRate()).thenReturn(3.0);
          when(timer.getFiveMinuteRate()).thenReturn(4.0);
          when(timer.getFifteenMinuteRate()).thenReturn(5.0);
  
          final Snapshot snapshot = mock(Snapshot.class);
          when(snapshot.getMax()).thenReturn(TimeUnit.MILLISECONDS.toNanos(100));
          when(snapshot.getMean()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(200));
          when(snapshot.getMin()).thenReturn(TimeUnit.MILLISECONDS.toNanos(300));
          when(snapshot.getStdDev()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(400));
          when(snapshot.getMedian()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(500));
          when(snapshot.get75thPercentile()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(600));
          when(snapshot.get95thPercentile()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(700));
          when(snapshot.get98thPercentile()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(800));
          when(snapshot.get99thPercentile()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(900));
          when(snapshot.get999thPercentile()).thenReturn((double) TimeUnit.MILLISECONDS.toNanos(1000));
  
          when(timer.getSnapshot()).thenReturn(snapshot);
  
          reporter.report(this.<Gauge>map(),
                  this.<Counter>map(),
                  this.<Histogram>map(),
                  this.<Meter>map(),
                  map("test.another.timer", timer));
  
          Assertions.assertThat(fileContents("test.another.timer.csv"))
                  .isEqualTo(csv(
                          "t,count,max,mean,min,stddev,p50,p75,p95,p98,p99,p999,mean_rate,m1_rate,m5_rate,m15_rate,rate_unit,duration_unit",
                          "19910191,1,100.000000,200.000000,300.000000,400.000000,500.000000,600.000000,700.000000,800.000000,900.000000,1000.000000,2.000000,3.000000,4.000000,5.000000,calls/second,milliseconds"
                  ));
      }
  
      @Test
      public void testCsvFileProviderIsUsed() {
          CsvFileProvider fileProvider = mock(CsvFileProvider.class);
          when(fileProvider.getFile(dataDirectory, MetricName.build("gauge"))).thenReturn(new File(dataDirectory, "guage.csv"));
  
          CsvReporter reporter = CsvReporter.forRegistry(registry)
                  .withCsvFileProvider(fileProvider)
                  .build(dataDirectory);
  
          final Gauge gauge = mock(Gauge.class);
          when(gauge.getValue()).thenReturn(1);
  
          reporter.report(map("gauge", gauge),
                  this.<Counter>map(),
                  this.<Histogram>map(),
                  this.<Meter>map(),
                  this.<Timer>map());
  
          verify(fileProvider).getFile(dataDirectory, MetricName.build("gauge"));
      }
  
      private String csv(String... lines) {
          final StringBuilder builder = new StringBuilder();
          for (String line : lines) {
              builder.append(line).append(String.format("%n"));
          }
          return builder.toString();
      }
  
      private String fileContents(String filename) throws IOException {
          final StringBuilder builder = new StringBuilder();
          final FileInputStream input = new FileInputStream(new File(dataDirectory, filename));
          try {
              final InputStreamReader reader = new InputStreamReader(input);
              final BufferedReader bufferedReader = new BufferedReader(reader);
              final CharBuffer buf = CharBuffer.allocate(1024);
              while (bufferedReader.read(buf) != -1) {
                  buf.flip();
                  builder.append(buf);
                  buf.clear();
              }
          } finally {
              input.close();
          }
          return builder.toString();
      }
  
      private <T> SortedMap<MetricName, T> map() {
          return new TreeMap<MetricName, T>();
      }
  
      private <T> SortedMap<MetricName, T> map(String name, T metric) {
          final TreeMap<MetricName, T> map = new TreeMap<MetricName, T>();
          map.put(MetricName.build(name), metric);
          return map;
      }
  }
  