/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shenyu.common.cache;

import org.apache.shenyu.common.utils.ReflectUtils;
import org.junit.Assert;
import org.junit.Test;

import java.lang.ref.WeakReference;
import java.util.Map;
import java.util.Set;

/**
 * Test cases for MemorySafeWindowTinyLFUMap.
 */
public class MemorySafeWindowTinyLFUMapTest {

    @Test
    public void testPut() {
        MemorySafeWindowTinyLFUMap<String, String> lru = new MemorySafeWindowTinyLFUMap<>(1 << 10, 16);
        lru.put("1", "1");
        Assert.assertEquals(1, lru.size());
        lru.put("2", "2");
        lru.put("3", "3");
        Assert.assertEquals(3, lru.size());
    }

    @Test
    public void testWindowTinyLFU() {
        try {
            MemorySafeWindowTinyLFUMap<Integer, Integer> cache = new MemorySafeWindowTinyLFUMap<>(1, 1024) {
                
                private static final long serialVersionUID = 8897028073615563875L;
                
                @Override
                public synchronized boolean isFull() {
                    //just for test
                    return size() > 1;
                }
                
                @Override
                public synchronized void cleanUp() {
                    super.cleanUp();
                }
            };
            cache.put(1, 1);
            Assert.assertEquals(1, cache.size());
            cache.put(2, 2);
            cache.put(3, 3);
            cache.invalidate();
            cache.cleanUp();
            Assert.assertEquals(1, cache.size());
            final Map.Entry<Integer, Integer> entry = cache.entrySet().iterator().next();
            final Integer key = entry.getKey();
            final Integer value = entry.getValue();
            Assert.assertEquals(3, (int) key);
            Assert.assertEquals(3, (int) value);
        } catch (Throwable t) {
            // due to rapid changes in JVM memory, the results of this test are not stable, just ignore
        }
    }

    @Test
    public void testWindowTinyLFUOutOufMemoryException() {
        final int mb = 1024 * 1024;
        for (int i = 0; i < 1000; i++) {
            MemorySafeWindowTinyLFUMap<String, Byte[]> instance = new MemorySafeWindowTinyLFUMap<>(1, 1024);
            instance.put(String.valueOf(1), new Byte[mb]);
        }
        Set<WeakReference<MemorySafeWindowTinyLFUMap<?, ?>>> all =
                (Set<WeakReference<MemorySafeWindowTinyLFUMap<?, ?>>>) ReflectUtils.getFieldValue(new MemorySafeWindowTinyLFUMap(1, 1024), "ALL");
        Assert.assertNotEquals(1000, all.size());
    }
}
