/*
 * 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.cassandra.cache;

import org.junit.Assert;
import org.junit.Test;

import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.db.RowIndexEntry;
import org.apache.cassandra.db.Mutation;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.service.CacheService;
import org.apache.cassandra.utils.ByteBufferUtil;

public class AutoSavingCacheTest extends SchemaLoader
{
    @Test
    public void testSerializeAndLoadKeyCache() throws Exception
    {
        ColumnFamilyStore cfs = Keyspace.open("Keyspace1").getColumnFamilyStore("Standard1");
        for (int i = 0; i < 2; i++)
        {
            Mutation rm = new Mutation("Keyspace1", ByteBufferUtil.bytes("key1"));
            rm.add("Standard1", Util.cellname("c1"), ByteBufferUtil.bytes(i), 0);
            rm.apply();
            cfs.forceBlockingFlush();
        }

        Assert.assertEquals(2, cfs.getSSTables().size());

        // preheat key cache
        for (SSTableReader sstable : cfs.getSSTables())
            sstable.getPosition(Util.dk("key1"), SSTableReader.Operator.EQ);

        AutoSavingCache<KeyCacheKey, RowIndexEntry> keyCache = CacheService.instance.keyCache;

        // serialize to file
        keyCache.submitWrite(keyCache.size()).get();
        keyCache.clear();

        Assert.assertEquals(0, keyCache.size());

        // then load saved
        keyCache.loadSaved(cfs);
        Assert.assertEquals(2, keyCache.size());
        for (SSTableReader sstable : cfs.getSSTables())
            Assert.assertNotNull(keyCache.get(new KeyCacheKey(cfs.metadata.cfId, sstable.descriptor, ByteBufferUtil.bytes("key1"))));
    }
}