content: /*
   * Copyright (C) 2011 Clearspring Technologies, Inc.
   *
   * Licensed 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.clearspring.analytics.stream;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.junit.Test;
  
  import cern.jet.random.Distributions;
  import cern.jet.random.engine.RandomEngine;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class TestConcurrentStreamSummary {
  
      private static final int NUM_ITERATIONS = 100000;
  
      @Test
      public void testStreamSummary() {
          ConcurrentStreamSummary<String> vs = new ConcurrentStreamSummary<String>(3);
          String[] stream = {"X", "X", "Y", "Z", "A", "B", "C", "X", "X", "A", "A", "A"};
          for (String i : stream) {
              vs.offer(i);
              /*
  		for(String s : vs.poll(3))
  		System.out.print(s+" ");
  			 */
              System.out.println(vs);
          }
      }
  
      @Test
      public void testTopK() {
          ConcurrentStreamSummary<String> vs = new ConcurrentStreamSummary<String>(3);
          String[] stream = {"X", "X", "Y", "Z", "A", "B", "C", "X", "X", "A", "C", "A", "A"};
          for (String i : stream) {
              vs.offer(i);
          }
          List<ScoredItem<String>> topK = vs.peekWithScores(3);
          for (ScoredItem<String> c : topK) {
              assertTrue(Arrays.asList("A", "C", "X").contains(c.getItem()));
          }
      }
  
      @Test
      public void testTopKWithIncrement() {
          ConcurrentStreamSummary<String> vs = new ConcurrentStreamSummary<String>(3);
          String[] stream = {"X", "X", "Y", "Z", "A", "B", "C", "X", "X", "A", "C", "A", "A"};
          for (String i : stream) {
              vs.offer(i, 10);
          }
          List<ScoredItem<String>> topK = vs.peekWithScores(3);
          for (ScoredItem<String> c : topK) {
              assertTrue(Arrays.asList("A", "C", "X").contains(c.getItem()));
          }
      }
  
      @Test
      public void testGeometricDistribution() {
          ConcurrentStreamSummary<Integer> vs = new ConcurrentStreamSummary<Integer>(10);
          RandomEngine re = RandomEngine.makeDefault();
  
          for (int i = 0; i < NUM_ITERATIONS; i++) {
              int z = Distributions.nextGeometric(0.25, re);
              vs.offer(z);
          }
  
          List<Integer> top = vs.peek(5);
          System.out.println("Geometric:");
          for (Integer e : top) {
              System.out.println(e);
          }
  
          int tippyTop = top.get(0);
          assertEquals(0, tippyTop);
          System.out.println(vs);
      }
  
  }
  