package org.cache2k.test;

import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;

import java.util.concurrent.TimeUnit;
import org.cache2k.Cache;
import org.cache2k.Cache2kBuilder;
import org.cache2k.event.CacheEntryRemovedListener;
import org.hamcrest.Matchers;
import org.junit.Test;

public class TestCache2k {
  @Test
  public void testNpeWithoutListener() {
    testAndVerifyStacktrace(Cache2kBuilder.of(String.class, String.class)
        .expireAfterWrite(10, TimeUnit.SECONDS)
        .entryCapacity(10)
        // no listener added
        .build());
  }

  @Test
  public void testNpeWithListener() {
    testAndVerifyStacktrace(Cache2kBuilder.of(String.class, String.class)
        .expireAfterWrite(10, TimeUnit.SECONDS)
        .entryCapacity(10)
        // listener added
        .addListener((CacheEntryRemovedListener<String, String>) (cache1, cacheEntry) -> {
        })
        .build());
  }


  private static void testAndVerifyStacktrace(Cache<String, String> cache) {
    try {
      final String value = null;
      cache.computeIfAbsent("npeKey", s -> value.substring(10));
      fail("this shall not pass");
    } catch (NullPointerException e) {
      assertThat(e.getStackTrace()[0].getClassName(), Matchers.is(TestCache2k.class.getName()));
    }
  }
}