package net.floodlightcontroller.util;

import static org.junit.Assert.assertEquals;

import org.junit.Before;
import org.junit.Test;

public class TimedCacheTest {
    public static class CacheEntry {
        public int key;

        public CacheEntry(int key) {
            this.key = key;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + key;
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            CacheEntry other = (CacheEntry) obj;
            if (key != other.key)
                return false;
            return true;
        }
    }

    protected TimedCache<CacheEntry> cache;

    @Before
    public void setUp() {
        // 
    }


    @Test
    public void testCaching() throws InterruptedException {
        int timeout = 50;
        int timeToSleep = 60;
        cache = new TimedCache<TimedCacheTest.CacheEntry>(100, timeout);

        CacheEntry e1a = new CacheEntry(1);
        CacheEntry e1b = new CacheEntry(1);
        CacheEntry e1c = new CacheEntry(1);
        CacheEntry e2 = new CacheEntry(2);

        assertEquals(false, cache.update(e1a));
        assertEquals(true, cache.update(e1a));
        assertEquals(true, cache.update(e1b));
        assertEquals(true, cache.update(e1c));
        assertEquals(false, cache.update(e2));
        assertEquals(true, cache.update(e2));

        Thread.sleep(timeToSleep);
        assertEquals(false, cache.update(e1a));
        assertEquals(false, cache.update(e2));
    }

    @Test
    public void testCapacity() throws InterruptedException {
        int timeout = 5000;
        cache = new TimedCache<TimedCacheTest.CacheEntry>(2, timeout);

        // Testing the capacity is tricky since the capacity can be 
        // exceeded for short amounts of time, so we try to flood the cache
        // to make sure the first entry is expired
        CacheEntry e1 = new CacheEntry(1);
        for (int i = 0; i < 100; i++) {
            CacheEntry e = new CacheEntry(i);
            cache.update(e);
        }

        // entry 1 should have been expired due to capacity limits 
        assertEquals(false, cache.update(e1));
    }


}