experiment-v3-jcas/uimaj-core/src/test/java/org/apache/uima/analysis_engine/impl/AnalysisEngineManagementImplTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.uima.analysis_engine.impl;

import java.util.Collections;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.uima.internal.util.Misc;
import org.apache.uima.internal.util.MultiThreadUtils;

import junit.framework.TestCase;

public class AnalysisEngineManagementImplTest extends TestCase {

  public void testNameGenerate() throws Exception {
    assertEquals("foo", AnalysisEngineManagementImpl.getRootName("foo"));
    assertEquals("foo2", AnalysisEngineManagementImpl.getRootName("foo"));
    assertEquals("foo3", AnalysisEngineManagementImpl.getRootName("foo"));
    
    // Try multi-threaded
    final Random random = new Random();
    final Set<String> s = Collections.newSetFromMap(new ConcurrentHashMap<>());
    int numberOfThreads = Math.min(50, Misc.numberOfCores * 5); 

    MultiThreadUtils.Run2isb run2isb = new MultiThreadUtils.Run2isb() {

      //  This method is run 100 * # of threads 
      //  It gets a root name based on "bar" - each one should get another name
      //   Tested by adding to a concurrent set and verifying it wasn't there before.
      public void call(int threadNbr, int repeatNbr, StringBuilder sb) throws Exception {
//        Random random = new Random();
        for (int j = 0; j < 2; j++) {
          assertTrue(s.add(AnalysisEngineManagementImpl.getRootName("bar")));
//          Thread.sleep(10, random.nextInt(2000));
          if ((threadNbr % 2) == 0) {
            Thread.sleep(0, random.nextInt(2000));  // sleep for 2 microseconds
          }
        }
      }
    };
    
    System.out.format("test multicore AnalysisEngineManagementImpl getRootName with %d threads%n", numberOfThreads);

    MultiThreadUtils.tstMultiThread("UniqueRootNameGenerator",  numberOfThreads,  100, run2isb, null);
//    System.out.println("debug");
  }
}