content: /**
   * Copyright The Apache Software Foundation
   *
   * 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.wasp.fserver.metrics;
  
  import com.alibaba.wasp.metrics.BaseSource;
  import org.apache.hadoop.metrics2.Metric;
  import org.apache.hadoop.metrics2.MetricsBuilder;
  import org.apache.hadoop.metrics2.MetricsRecordBuilder;
  import org.apache.hadoop.metrics2.MetricsSource;
  import org.apache.hadoop.metrics2.MetricsTag;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  /** Interface of a class to make assertions about metrics values. */
  public class MetricsAssertHelperImpl implements MetricsAssertHelper {
  
    private Map<String, String> tags = new HashMap<String, String>();
    private Map<String, Number> gauges = new HashMap<String, Number>();
    private Map<String, Long> counters = new HashMap<String, Long>();
  
    public class MockMetricsBuilder implements MetricsBuilder {
  
      @Override
      public MetricsRecordBuilder addRecord(String s) {
        return new MockRecordBuilder();
      }
    }
  
    public class MockRecordBuilder extends MetricsRecordBuilder {
  
      @Override
      public MetricsRecordBuilder tag(String s, String s1, String s2) {
        tags.put(canonicalizeMetricName(s), s2);
        return this;
      }
  
      @Override
      public MetricsRecordBuilder add(MetricsTag metricsTag) {
        tags.put(canonicalizeMetricName(metricsTag.name()), metricsTag.value());
        return this;
      }
  
      @Override
      public MetricsRecordBuilder setContext(String s) {
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addCounter(String s, String s1, int i) {
        counters.put(canonicalizeMetricName(s), Long.valueOf(i));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addCounter(String s, String s1, long l) {
        counters.put(canonicalizeMetricName(s), Long.valueOf(l));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addGauge(String s, String s1, int i) {
        gauges.put(canonicalizeMetricName(s), Long.valueOf(i));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addGauge(String s, String s1, long l) {
        gauges.put(canonicalizeMetricName(s), Long.valueOf(l));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addGauge(String s, String s1, float v) {
        gauges.put(canonicalizeMetricName(s), Double.valueOf(v));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder addGauge(String s, String s1, double v) {
        gauges.put(canonicalizeMetricName(s), Double.valueOf(v));
        return this;
      }
  
      @Override
      public MetricsRecordBuilder add(Metric metric) {
        gauges.put(canonicalizeMetricName(metric.name()), metric.value());
        return this;
      }
    }
  
    @Override
    public void assertTag(String name, String expected, BaseSource source) {
      getMetrics(source);
      String cName = canonicalizeMetricName(name);
      assertEquals("Tags should be equal", expected, tags.get(cName));
    }
  
    @Override
    public void assertGauge(String name, long expected, BaseSource source) {
      long found = getGaugeLong(name, source);
      assertEquals("Metrics Should be equal", (long) Long.valueOf(expected),
          found);
    }
  
    @Override
    public void assertGaugeGt(String name, long expected, BaseSource source) {
      double found = getGaugeDouble(name, source);
      assertTrue(name + " (" + found + ") should be greater than " + expected,
          found > expected);
    }
  
    @Override
    public void assertGaugeLt(String name, long expected, BaseSource source) {
      double found = getGaugeDouble(name, source);
      assertTrue(name + "(" + found + ") should be less than " + expected,
          found < expected);
    }
  
    @Override
    public void assertGauge(String name, double expected, BaseSource source) {
      double found = getGaugeDouble(name, source);
      assertEquals("Metrics Should be equal", (double) Double.valueOf(expected),
          found, 0.01);
    }
  
    @Override
    public void assertGaugeGt(String name, double expected, BaseSource source) {
      double found = getGaugeDouble(name, source);
      assertTrue(name + "(" + found + ") should be greater than " + expected,
          found > expected);
    }
  
    @Override
    public void assertGaugeLt(String name, double expected, BaseSource source) {
      double found = getGaugeDouble(name, source);
      assertTrue(name + "(" + found + ") should be less than " + expected,
          found < expected);
    }
  
    @Override
    public void assertCounter(String name, long expected, BaseSource source) {
      long found = getCounter(name, source);
      assertEquals("Metrics Counters should be equal",
          (long) Long.valueOf(expected), found);
    }
  
    @Override
    public void assertCounterGt(String name, long expected, BaseSource source) {
      long found = getCounter(name, source);
      assertTrue(name + " (" + found + ") should be greater than " + expected,
          found > expected);
    }
  
    @Override
    public void assertCounterLt(String name, long expected, BaseSource source) {
      long found = getCounter(name, source);
      assertTrue(name + "(" + found + ") should be less than " + expected,
          found < expected);
    }
  
    @Override
    public long getCounter(String name, BaseSource source) {
      getMetrics(source);
      String cName = canonicalizeMetricName(name);
      assertNotNull("Should get counter " + cName + " but did not",
          counters.get(cName));
      return counters.get(cName).longValue();
    }
  
    @Override
    public double getGaugeDouble(String name, BaseSource source) {
      getMetrics(source);
      String cName = canonicalizeMetricName(name);
      assertNotNull("Should get gauge " + cName + " but did not",
          gauges.get(cName));
      return gauges.get(cName).doubleValue();
    }
  
    @Override
    public long getGaugeLong(String name, BaseSource source) {
      getMetrics(source);
      String cName = canonicalizeMetricName(name);
      assertNotNull("Should get gauge " + cName + " but did not",
          gauges.get(cName));
      return gauges.get(cName).longValue();
    }
  
    private void reset() {
      tags.clear();
      gauges.clear();
      counters.clear();
    }
  
    private void getMetrics(BaseSource source) {
      reset();
      if (!(source instanceof MetricsSource)) {
        assertTrue("The Source passed must be a MetricsSource", false);
      }
      MetricsSource impl = (MetricsSource) source;
  
      impl.getMetrics(new MockMetricsBuilder(), true);
  
    }
  
    private String canonicalizeMetricName(String in) {
      return in.toLowerCase().replaceAll("[^A-Za-z0-9 ]", "");
    }
  }
  