Guava Cache Hello World

package org.tonylin.practice.guava.cache;
 
import java.util.concurrent.TimeUnit;
 
import org.junit.Assert;
import org.junit.Test;
 
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
 
public class TestCache {
 
	@Test
	public void test() throws Exception {
		LoadingCache<String, String> cache =  CacheBuilder.newBuilder()
		.maximumSize(10)
		.expireAfterAccess(5, TimeUnit.SECONDS)
		.expireAfterWrite(5, TimeUnit.SECONDS)
		.softValues()
		.build(new CacheLoader<String, String>(){
			private int count = 0;
			@Override
			public String load(String key) throws Exception {
				return key + (count++);
			}
		});
 
		Assert.assertEquals("test10", cache.get("test1"));
		Thread.sleep(4000);
		Assert.assertEquals("test10", cache.get("test1"));
		Thread.sleep(2000);
		Assert.assertNull(cache.getIfPresent("test1"));
		Assert.assertEquals("test11", cache.get("test1"));
	}
}