GuavaCachedTemplateLoaderTest.java

package com.github.jknack.handlebars.io;

import static java.lang.System.out;
import static org.junit.Assert.assertNotNull;

import java.io.File;
import java.util.concurrent.TimeUnit;

import org.junit.Test;

import com.google.common.base.Stopwatch;

public class GuavaCachedTemplateLoaderTest {

  @Test
  public void testCacheWithExpiration() throws Exception {
    TemplateLoader loader = new FileTemplateLoader(new File(
        "src/test/resources"));
    TemplateLoader cachedLoader = GuavaCachedTemplateLoader
        .cacheWithExpiration(loader, 200, TimeUnit.MILLISECONDS);

    assertNotNull(loader.sourceAt("template"));
    assertNotNull(cachedLoader.sourceAt("template"));

    final int TOTAL = 1000;

    Stopwatch sw = new Stopwatch().start();
    for (int i = 0; i < TOTAL; i++) {
      loader.sourceAt("template");
    }
    sw.stop();
    out.println("Loader took: " + sw);
    sw.reset().start();
    for (int i = 0; i < TOTAL; i++) {
      cachedLoader.sourceAt("template");
    }
    out.println("Cached took: " + sw);

  }

  @Test
  public void testCacheWithExpirationAgain() throws Exception {
    // lazy mans JVM warming
    testCacheWithExpiration();
  }

}