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  package org.apache.cassandra.test.microbench;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Random;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Assert;
  
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.cache.AutoSavingCache;
  import org.apache.cassandra.cache.KeyCacheKey;
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DataStorageSpec;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.commitlog.CommitLog;
  import org.apache.cassandra.db.marshal.AsciiType;
  import org.apache.cassandra.io.sstable.AbstractRowIndexEntry;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.service.CacheService;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.TearDown;
  import org.openjdk.jmh.annotations.Threads;
  import org.openjdk.jmh.annotations.Warmup;
  
  @SuppressWarnings("unused")
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  @Warmup(iterations = 1, time = 5, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 1, time = 10, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 1)
  @Threads(1)
  @State(Scope.Benchmark)
  public class CacheLoaderBench
  {
      private static final int numSSTables = 100;
      private static final int numKeysPerTable = 10000;
  
      private final Random random = new Random();
  
      @Param({ "true", "false" })
      boolean useUUIDGenerationIdentifiers;
  
      @Setup(Level.Trial)
      public void setup() throws Throwable
      {
          DatabaseDescriptor.daemonInitialization(() -> {
              Config config = DatabaseDescriptor.loadConfig();
              config.key_cache_size = new DataStorageSpec.LongMebibytesBound(256);
              config.uuid_sstable_identifiers_enabled = useUUIDGenerationIdentifiers;
              config.dump_heap_on_uncaught_exception = false;
              return config;
          });
          ServerTestUtils.prepareServer();
  
          String keyspace = "ks";
          String table1 = "tab1";
          String table2 = "tab2";
  
          QueryProcessor.executeInternal(String.format("CREATE KEYSPACE %s with replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 } and durable_writes = false", keyspace));
          QueryProcessor.executeInternal(String.format("CREATE TABLE %s.%s (key text PRIMARY KEY, val text)", keyspace, table1));
          QueryProcessor.executeInternal(String.format("CREATE TABLE %s.%s (key text PRIMARY KEY, val text)", keyspace, table2));
  
          Keyspace.system().forEach(k -> k.getColumnFamilyStores().forEach(ColumnFamilyStore::disableAutoCompaction));
  
          ColumnFamilyStore cfs1 = Keyspace.open(keyspace).getColumnFamilyStore(table1);
          ColumnFamilyStore cfs2 = Keyspace.open(keyspace).getColumnFamilyStore(table2);
          cfs1.disableAutoCompaction();
          cfs2.disableAutoCompaction();
  
          // Write a bunch of sstables to both cfs1 and cfs2
  
          List<ColumnFamilyStore> columnFamilyStores = new ArrayList<>(2);
          columnFamilyStores.add(cfs1);
          columnFamilyStores.add(cfs2);
  
          for (ColumnFamilyStore cfs: columnFamilyStores)
          {
              cfs.truncateBlocking();
              for (int i = 0; i < numSSTables ; i++)
              {
                  ColumnMetadata colDef = ColumnMetadata.regularColumn(cfs.metadata(), ByteBufferUtil.bytes("val"), AsciiType.instance, ColumnMetadata.NO_UNIQUE_ID);
                  for (int k = 0; k < numKeysPerTable; k++)
                  {
                      RowUpdateBuilder rowBuilder = new RowUpdateBuilder(cfs.metadata(), System.currentTimeMillis() + random.nextInt(), "key" + k);
                      rowBuilder.add(colDef, "val1");
                      rowBuilder.build().apply();
                  }
                  cfs.forceBlockingFlush(ColumnFamilyStore.FlushReason.USER_FORCED);
              }
  
              Assert.assertEquals(numSSTables, cfs.getLiveSSTables().size());
  
              // preheat key cache
              for (SSTableReader sstable : cfs.getLiveSSTables())
              {
                  for (int k = 0; k < numKeysPerTable; k++)
                  {
                      sstable.getPosition(Util.dk("key" + k), SSTableReader.Operator.EQ);
                  }
              }
          }
  
          AutoSavingCache<KeyCacheKey, AbstractRowIndexEntry> keyCache = CacheService.instance.keyCache;
  
          // serialize to file
          keyCache.submitWrite(keyCache.size()).get();
      }
  
      @Setup(Level.Invocation)
      public void setupKeyCache()
      {
          AutoSavingCache<KeyCacheKey, AbstractRowIndexEntry> keyCache = CacheService.instance.keyCache;
          keyCache.clear();
      }
  
      @TearDown(Level.Trial)
      public void teardown()
      {
          CQLTester.tearDownClass();
          CommitLog.instance.stopUnsafe(true);
          CQLTester.cleanup();
      }
  
      @Benchmark
      public void keyCacheLoadTest() throws Throwable
      {
          AutoSavingCache<KeyCacheKey, AbstractRowIndexEntry> keyCache = CacheService.instance.keyCache;
  
          keyCache.loadSavedAsync().get();
      }
  }
  