// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

package org.rocksdb;

/**
 * The logical mapping of tickers defined in rocksdb::Tickers.
 * <p>
 * Java byte value mappings don't align 1:1 to the c++ values. c++ rocksdb::Tickers enumeration type
 * is uint32_t and java org.rocksdb.TickerType is byte, this causes mapping issues when
 * rocksdb::Tickers value is greater then 127 (0x7F) for jbyte jni interface as range greater is not
 * available. Without breaking interface in minor versions, value mappings for
 * org.rocksdb.TickerType leverage full byte range [-128 (-0x80), (0x7F)]. Newer tickers added
 * should descend into negative values until TICKER_ENUM_MAX reaches -128 (-0x80).
 */
public enum TickerType {

    /**
     * total block cache misses
     *
     * REQUIRES: BLOCK_CACHE_MISS == BLOCK_CACHE_INDEX_MISS +
     *     BLOCK_CACHE_FILTER_MISS +
     *     BLOCK_CACHE_DATA_MISS;
     */
    BLOCK_CACHE_MISS((byte) 0x0),

    /**
     * total block cache hit
     *
     * REQUIRES: BLOCK_CACHE_HIT == BLOCK_CACHE_INDEX_HIT +
     *     BLOCK_CACHE_FILTER_HIT +
     *     BLOCK_CACHE_DATA_HIT;
     */
    BLOCK_CACHE_HIT((byte) 0x1),

    BLOCK_CACHE_ADD((byte) 0x2),

    /**
     * # of failures when adding blocks to block cache.
     */
    BLOCK_CACHE_ADD_FAILURES((byte) 0x3),

    /**
     * # of times cache miss when accessing index block from block cache.
     */
    BLOCK_CACHE_INDEX_MISS((byte) 0x4),

    /**
     * # of times cache hit when accessing index block from block cache.
     */
    BLOCK_CACHE_INDEX_HIT((byte) 0x5),

    /**
     * # of index blocks added to block cache.
     */
    BLOCK_CACHE_INDEX_ADD((byte) 0x6),

    /**
     * # of bytes of index blocks inserted into cache
     */
    BLOCK_CACHE_INDEX_BYTES_INSERT((byte) 0x7),

    /**
     * # of times cache miss when accessing filter block from block cache.
     */
    BLOCK_CACHE_FILTER_MISS((byte) 0x8),

    /**
     * # of times cache hit when accessing filter block from block cache.
     */
    BLOCK_CACHE_FILTER_HIT((byte) 0x9),

    /**
     * # of filter blocks added to block cache.
     */
    BLOCK_CACHE_FILTER_ADD((byte) 0xA),

    /**
     * # of bytes of bloom filter blocks inserted into cache
     */
    BLOCK_CACHE_FILTER_BYTES_INSERT((byte) 0xB),

    /**
     * # of times cache miss when accessing data block from block cache.
     */
    BLOCK_CACHE_DATA_MISS((byte) 0xC),

    /**
     * # of times cache hit when accessing data block from block cache.
     */
    BLOCK_CACHE_DATA_HIT((byte) 0xD),

    /**
     * # of data blocks added to block cache.
     */
    BLOCK_CACHE_DATA_ADD((byte) 0xE),

    /**
     * # of bytes of data blocks inserted into cache
     */
    BLOCK_CACHE_DATA_BYTES_INSERT((byte) 0xF),

    /**
     * # of bytes read from cache.
     */
    BLOCK_CACHE_BYTES_READ((byte) 0x10),

    /**
     * # of bytes written into cache.
     */
    BLOCK_CACHE_BYTES_WRITE((byte) 0x11),

    /**
     * Block cache related stats for Compression dictionaries
     */
    BLOCK_CACHE_COMPRESSION_DICT_MISS((byte) 0x12),
    BLOCK_CACHE_COMPRESSION_DICT_HIT((byte) 0x13),
    BLOCK_CACHE_COMPRESSION_DICT_ADD((byte) 0x14),
    BLOCK_CACHE_COMPRESSION_DICT_BYTES_INSERT((byte) 0x15),

    /**
     * Redundant additions to block cache
     */
    BLOCK_CACHE_ADD_REDUNDANT((byte) 0x16),
    BLOCK_CACHE_INDEX_ADD_REDUNDANT((byte) 0x17),
    BLOCK_CACHE_FILTER_ADD_REDUNDANT((byte) 0x18),
    BLOCK_CACHE_DATA_ADD_REDUNDANT((byte) 0x19),
    BLOCK_CACHE_COMPRESSION_DICT_ADD_REDUNDANT((byte) 0x1A),

    /**
     * Number of secondary cache hits
     */
    SECONDARY_CACHE_HITS((byte) 0x1B),
    SECONDARY_CACHE_FILTER_HITS((byte) 0x1C),
    SECONDARY_CACHE_INDEX_HITS((byte) 0x1D),
    SECONDARY_CACHE_DATA_HITS((byte) 0x1E),

    COMPRESSED_SECONDARY_CACHE_DUMMY_HITS((byte) 0x1F),
    COMPRESSED_SECONDARY_CACHE_HITS((byte) 0x20),
    COMPRESSED_SECONDARY_CACHE_PROMOTIONS((byte) 0x21),
    COMPRESSED_SECONDARY_CACHE_PROMOTION_SKIPS((byte) 0x22),

    /**
     * # of times bloom filter has avoided file reads.
     */
    BLOOM_FILTER_USEFUL((byte) 0x23),

    /**
     * # of times bloom FullFilter has not avoided the reads.
     */
    BLOOM_FILTER_FULL_POSITIVE((byte) 0x24),

    /**
     * # of times bloom FullFilter has not avoided the reads and data actually
     * exist.
     */
    BLOOM_FILTER_FULL_TRUE_POSITIVE((byte) 0x25),

    /**
     * Number of times bloom was checked before creating iterator on a
     * file, and the number of times the check was useful in avoiding
     * iterator creation (and thus likely IOPs).
     */
    BLOOM_FILTER_PREFIX_CHECKED((byte) 0x26),
    BLOOM_FILTER_PREFIX_USEFUL((byte) 0x27),
    BLOOM_FILTER_PREFIX_TRUE_POSITIVE((byte) 0x28),

    /**
     * # persistent cache hit
     */
    PERSISTENT_CACHE_HIT((byte) 0x29),

    /**
     * # persistent cache miss
     */
    PERSISTENT_CACHE_MISS((byte) 0x2A),

    /**
     * # total simulation block cache hits
     */
    SIM_BLOCK_CACHE_HIT((byte) 0x2B),

    /**
     * # total simulation block cache misses
     */
    SIM_BLOCK_CACHE_MISS((byte) 0x2C),

    /**
     * # of memtable hits.
     */
    MEMTABLE_HIT((byte) 0x2D),

    /**
     * # of memtable misses.
     */
    MEMTABLE_MISS((byte) 0x2E),

    /**
     * # of Get() queries served by L0
     */
    GET_HIT_L0((byte) 0x2F),

    /**
     * # of Get() queries served by L1
     */
    GET_HIT_L1((byte) 0x30),

    /**
     * # of Get() queries served by L2 and up
     */
    GET_HIT_L2_AND_UP((byte) 0x31),

    /**
     * COMPACTION_KEY_DROP_* count the reasons for key drop during compaction
     * There are 4 reasons currently.
     */

    /**
     * key was written with a newer value.
     */
    COMPACTION_KEY_DROP_NEWER_ENTRY((byte) 0x32),

    /**
     * Also includes keys dropped for range del.
     * The key is obsolete.
     */
    COMPACTION_KEY_DROP_OBSOLETE((byte) 0x33),

    /**
     * key was covered by a range tombstone.
     */
    COMPACTION_KEY_DROP_RANGE_DEL((byte) 0x34),

    /**
     * User compaction function has dropped the key.
     */
    COMPACTION_KEY_DROP_USER((byte) 0x35),

    /**
     * all keys in range were deleted.
     */
    COMPACTION_RANGE_DEL_DROP_OBSOLETE((byte) 0x36),

    /**
     * Deletions obsoleted before bottom level due to file gap optimization.
     */
    COMPACTION_OPTIMIZED_DEL_DROP_OBSOLETE((byte) 0x37),

    /**
     * Compactions cancelled to prevent ENOSPC
     */
    COMPACTION_CANCELLED((byte) 0x38),

    /**
     * Number of keys written to the database via the Put and Write call's.
     */
    NUMBER_KEYS_WRITTEN((byte) 0x39),

    /**
     * Number of Keys read.
     */
    NUMBER_KEYS_READ((byte) 0x3A),

    /**
     * Number keys updated, if inplace update is enabled
     */
    NUMBER_KEYS_UPDATED((byte) 0x3B),

    /**
     * The number of uncompressed bytes issued by DB::Put(), DB::Delete(),\
     * DB::Merge(), and DB::Write().
     */
    BYTES_WRITTEN((byte) 0x3C),

    /**
     * The number of uncompressed bytes read from DB::Get().  It could be
     * either from memtables, cache, or table files.
     *
     * For the number of logical bytes read from DB::MultiGet(),
     * please use {@link #NUMBER_MULTIGET_BYTES_READ}.
     */
    BYTES_READ((byte) 0x3D),

    /**
     * The number of calls to seek.
     */
    NUMBER_DB_SEEK((byte) 0x3E),

    /**
     * The number of calls to next.
     */
    NUMBER_DB_NEXT((byte) 0x3F),

    /**
     * The number of calls to prev.
     */
    NUMBER_DB_PREV((byte) 0x40),

    /**
     * The number of calls to seek that returned data.
     */
    NUMBER_DB_SEEK_FOUND((byte) 0x41),

    /**
     * The number of calls to next that returned data.
     */
    NUMBER_DB_NEXT_FOUND((byte) 0x42),

    /**
     * The number of calls to prev that returned data.
     */
    NUMBER_DB_PREV_FOUND((byte) 0x43),

    /**
     * The number of uncompressed bytes read from an iterator.
     * Includes size of key and value.
     */
    ITER_BYTES_READ((byte) 0x44),

    /**
     * Number of internal skipped during iteration
     */
    NUMBER_ITER_SKIP((byte) 0x45),

    /**
     * Number of times we had to reseek inside an iteration to skip
     * over large number of keys with same userkey.
     */
    NUMBER_OF_RESEEKS_IN_ITERATION((byte) 0x46),

    /**
     * Number of iterators created.
     */
    NO_ITERATOR_CREATED((byte) 0x47),

    /**
     * Number of iterators deleted.
     */
    NO_ITERATOR_DELETED((byte) 0x48),

    NO_FILE_OPENS((byte) 0x49),

    NO_FILE_ERRORS((byte) 0x4A),

    /**
     * Writer has to wait for compaction or flush to finish.
     */
    STALL_MICROS((byte) 0x4B),

    /**
     * The wait time for db mutex.
     *
     * Disabled by default. To enable it set stats level to {@link StatsLevel#ALL}
     */
    DB_MUTEX_WAIT_MICROS((byte) 0x4C),

    /**
     * Number of MultiGet calls.
     */
    NUMBER_MULTIGET_CALLS((byte) 0x4D),

    /**
     * Number of MultiGet keys read.
     */
    NUMBER_MULTIGET_KEYS_READ((byte) 0x4E),

    /**
     * Number of MultiGet bytes read.
     */
    NUMBER_MULTIGET_BYTES_READ((byte) 0x4F),

    /**
     * Number of MultiGet keys found (vs number requested)
     */
    NUMBER_MULTIGET_KEYS_FOUND((byte) 0x50),

    NUMBER_MERGE_FAILURES((byte) 0x51),

    /**
     * Record the number of calls to {@link RocksDB#getUpdatesSince(long)}. Useful to keep track of
     * transaction log iterator refreshes.
     */
    GET_UPDATES_SINCE_CALLS((byte) 0x52),

    /**
     * Number of times WAL sync is done.
     */
    WAL_FILE_SYNCED((byte) 0x53),

    /**
     * Number of bytes written to WAL.
     */
    WAL_FILE_BYTES((byte) 0x54),

    /**
     * Writes can be processed by requesting thread or by the thread at the
     * head of the writers queue.
     */
    WRITE_DONE_BY_SELF((byte) 0x55),

    /**
     * Equivalent to writes done for others.
     */
    WRITE_DONE_BY_OTHER((byte) 0x56),

    /**
     * Number of Write calls that request WAL.
     */
    WRITE_WITH_WAL((byte) 0x57),

    /**
     * Bytes read during compaction.
     */
    COMPACT_READ_BYTES((byte) 0x58),

    /**
     * Bytes written during compaction.
     */
    COMPACT_WRITE_BYTES((byte) 0x59),

    /**
     * Bytes written during flush.
     */
    FLUSH_WRITE_BYTES((byte) 0x5A),

    /**
     * Compaction read and write statistics broken down by CompactionReason
     */
    COMPACT_READ_BYTES_MARKED((byte) 0x5B),
    COMPACT_READ_BYTES_PERIODIC((byte) 0x5C),
    COMPACT_READ_BYTES_TTL((byte) 0x5D),
    COMPACT_WRITE_BYTES_MARKED((byte) 0x5E),
    COMPACT_WRITE_BYTES_PERIODIC((byte) 0x5F),
    COMPACT_WRITE_BYTES_TTL((byte) 0x60),

    /**
     * Number of table's properties loaded directly from file, without creating
     * table reader object.
     */
    NUMBER_DIRECT_LOAD_TABLE_PROPERTIES((byte) 0x61),
    NUMBER_SUPERVERSION_ACQUIRES((byte) 0x62),
    NUMBER_SUPERVERSION_RELEASES((byte) 0x63),
    NUMBER_SUPERVERSION_CLEANUPS((byte) 0x64),

    /**
     * # of compressions/decompressions executed
     */
    NUMBER_BLOCK_COMPRESSED((byte) 0x65),
    NUMBER_BLOCK_DECOMPRESSED((byte) 0x66),

    BYTES_COMPRESSED_FROM((byte) 0x67),
    BYTES_COMPRESSED_TO((byte) 0x68),
    BYTES_COMPRESSION_BYPASSED((byte) 0x69),
    BYTES_COMPRESSION_REJECTED((byte) 0x6A),
    NUMBER_BLOCK_COMPRESSION_BYPASSED((byte) 0x6B),
    NUMBER_BLOCK_COMPRESSION_REJECTED((byte) 0x6C),
    BYTES_DECOMPRESSED_FROM((byte) 0x6D),
    BYTES_DECOMPRESSED_TO((byte) 0x6E),

    MERGE_OPERATION_TOTAL_TIME((byte) 0x6F),
    FILTER_OPERATION_TOTAL_TIME((byte) 0x70),
    COMPACTION_CPU_TOTAL_TIME((byte) 0x71),

    /**
     * Row cache.
     */
    ROW_CACHE_HIT((byte) 0x72),
    ROW_CACHE_MISS((byte) 0x73),

    /**
     * Read amplification statistics.
     *
     * Read amplification can be calculated using this formula
     * (READ_AMP_TOTAL_READ_BYTES / READ_AMP_ESTIMATE_USEFUL_BYTES)
     *
     * REQUIRES: ReadOptions::read_amp_bytes_per_bit to be enabled
     */

    /**
     * Estimate of total bytes actually used.
     */
    READ_AMP_ESTIMATE_USEFUL_BYTES((byte) 0x74),

    /**
     * Total size of loaded data blocks.
     */
    READ_AMP_TOTAL_READ_BYTES((byte) 0x75),

    /**
     * Number of refill intervals where rate limiter's bytes are fully consumed.
     */
    NUMBER_RATE_LIMITER_DRAINS((byte) 0x76),

    /**
     * BlobDB specific stats
     * # of Put/PutTTL/PutUntil to BlobDB.
     */
    BLOB_DB_NUM_PUT((byte) 0x77),

    /**
     * # of Write to BlobDB.
     */
    BLOB_DB_NUM_WRITE((byte) 0x78),

    /**
     * # of Get to BlobDB.
     */
    BLOB_DB_NUM_GET((byte) 0x79),

    /**
     * # of MultiGet to BlobDB.
     */
    BLOB_DB_NUM_MULTIGET((byte) 0x7A),

    /**
     * # of Seek/SeekToFirst/SeekToLast/SeekForPrev to BlobDB iterator.
     */
    BLOB_DB_NUM_SEEK((byte) 0x7B),

    /**
     * # of Next to BlobDB iterator.
     */
    BLOB_DB_NUM_NEXT((byte) 0x7C),

    /**
     * # of Prev to BlobDB iterator.
     */
    BLOB_DB_NUM_PREV((byte) 0x7D),

    /**
     * # of keys written to BlobDB.
     */
    BLOB_DB_NUM_KEYS_WRITTEN((byte) 0x7E),

    /**
     * # of keys read from BlobDB.
     */
    BLOB_DB_NUM_KEYS_READ((byte) 0x7F),

    /**
     * # of bytes (key + value) written to BlobDB.
     */
    BLOB_DB_BYTES_WRITTEN((byte) -0x1),

    /**
     * # of bytes (keys + value) read from BlobDB.
     */
    BLOB_DB_BYTES_READ((byte) -0x2),

    /**
     * # of keys written by BlobDB as non-TTL inlined value.
     */
    BLOB_DB_WRITE_INLINED((byte) -0x3),

    /**
     * # of keys written by BlobDB as TTL inlined value.
     */
    BLOB_DB_WRITE_INLINED_TTL((byte) -0x4),

    /**
     * # of keys written by BlobDB as non-TTL blob value.
     */
    BLOB_DB_WRITE_BLOB((byte) -0x5),

    /**
     * # of keys written by BlobDB as TTL blob value.
     */
    BLOB_DB_WRITE_BLOB_TTL((byte) -0x6),

    /**
     * # of bytes written to blob file.
     */
    BLOB_DB_BLOB_FILE_BYTES_WRITTEN((byte) -0x7),

    /**
     * # of bytes read from blob file.
     */
    BLOB_DB_BLOB_FILE_BYTES_READ((byte) -0x8),

    /**
     * # of times a blob files being synced.
     */
    BLOB_DB_BLOB_FILE_SYNCED((byte) -0x9),

    /**
     * # of blob index evicted from base DB by BlobDB compaction filter because
     * of expiration.
     */
    BLOB_DB_BLOB_INDEX_EXPIRED_COUNT((byte) -0xA),

    /**
     * Size of blob index evicted from base DB by BlobDB compaction filter
     * because of expiration.
     */
    BLOB_DB_BLOB_INDEX_EXPIRED_SIZE((byte) -0xB),

    /**
     * # of blob index evicted from base DB by BlobDB compaction filter because
     * of corresponding file deleted.
     */
    BLOB_DB_BLOB_INDEX_EVICTED_COUNT((byte) -0xC),

    /**
     * Size of blob index evicted from base DB by BlobDB compaction filter
     * because of corresponding file deleted.
     */
    BLOB_DB_BLOB_INDEX_EVICTED_SIZE((byte) -0xD),

    /**
     * # of blob files being garbage collected.
     */
    BLOB_DB_GC_NUM_FILES((byte) -0xE),

    /**
     * # of blob files generated by garbage collection.
     */
    BLOB_DB_GC_NUM_NEW_FILES((byte) -0xF),

    /**
     * # of BlobDB garbage collection failures.
     */
    BLOB_DB_GC_FAILURES((byte) -0x10),

    /**
     * # of keys relocated to new blob file by garbage collection.
     */
    BLOB_DB_GC_NUM_KEYS_RELOCATED((byte) -0x11),

    /**
     * # of bytes relocated to new blob file by garbage collection.
     */
    BLOB_DB_GC_BYTES_RELOCATED((byte) -0x12),

    /**
     * # of blob files evicted because of BlobDB is full.
     */
    BLOB_DB_FIFO_NUM_FILES_EVICTED((byte) -0x13),

    /**
     * # of keys in the blob files evicted because of BlobDB is full.
     */
    BLOB_DB_FIFO_NUM_KEYS_EVICTED((byte) -0x14),

    /**
     * # of bytes in the blob files evicted because of BlobDB is full.
     */
    BLOB_DB_FIFO_BYTES_EVICTED((byte) -0x15),

    /**
     * # of times cache miss when accessing blob from blob cache.
     */
    BLOB_DB_CACHE_MISS((byte) -0x16),

    /**
     * # of times cache hit when accessing blob from blob cache.
     */
    BLOB_DB_CACHE_HIT((byte) -0x17),

    /**
     * # of data blocks added to blob cache.
     */
    BLOB_DB_CACHE_ADD((byte) -0x18),

    /**
     * # # of failures when adding blobs to blob cache.
     */
    BLOB_DB_CACHE_ADD_FAILURES((byte) -0x19),

    /**
     * # of bytes read from blob cache.
     */
    BLOB_DB_CACHE_BYTES_READ((byte) -0x1A),

    /**
     * # of bytes written into blob cache.
     */
    BLOB_DB_CACHE_BYTES_WRITE((byte) -0x1B),

    /**
     * These counters indicate a performance issue in WritePrepared transactions.
     * We should not seem them ticking them much.
     * # of times prepare_mutex_ is acquired in the fast path.
     */
    TXN_PREPARE_MUTEX_OVERHEAD((byte) -0x1C),

    /**
     * # of times old_commit_map_mutex_ is acquired in the fast path.
     */
    TXN_OLD_COMMIT_MAP_MUTEX_OVERHEAD((byte) -0x1D),

    /**
     * # of times we checked a batch for duplicate keys.
     */
    TXN_DUPLICATE_KEY_OVERHEAD((byte) -0x1E),

    /**
     * # of times snapshot_mutex_ is acquired in the fast path.
     */
    TXN_SNAPSHOT_MUTEX_OVERHEAD((byte) -0x1F),

    /**
     * # of times ::Get returned TryAgain due to expired snapshot seq
     */
    TXN_GET_TRY_AGAIN((byte) -0x20),

    /**
     * # of files marked as trash by delete scheduler
     */
    FILES_MARKED_TRASH((byte) -0x21),

    /**
     * # of trash files deleted by the background thread from the trash queue
     */
    FILES_DELETED_FROM_TRASH_QUEUE((byte) -0x22),

    /**
     * # of files deleted immediately by delete scheduler
     */
    FILES_DELETED_IMMEDIATELY((byte) -0x23),

    /**
     * DB error handler statistics
     */
    ERROR_HANDLER_BG_ERROR_COUNT((byte) -0x24),
    ERROR_HANDLER_BG_IO_ERROR_COUNT((byte) -0x25),
    ERROR_HANDLER_BG_RETRYABLE_IO_ERROR_COUNT((byte) -0x26),
    ERROR_HANDLER_AUTORESUME_COUNT((byte) -0x27),
    ERROR_HANDLER_AUTORESUME_RETRY_TOTAL_COUNT((byte) -0x28),
    ERROR_HANDLER_AUTORESUME_SUCCESS_COUNT((byte) -0x29),

    /**
     * Bytes of raw data (payload) found on memtable at flush time.
     * Contains the sum of garbage payload (bytes that are discarded
     * at flush time) and useful payload (bytes of data that will
     * eventually be written to SSTable).
     */
    MEMTABLE_PAYLOAD_BYTES_AT_FLUSH((byte) -0x2A),
    /**
     * Outdated bytes of data present on memtable at flush time.
     */
    MEMTABLE_GARBAGE_BYTES_AT_FLUSH((byte) -0x2B),

    /**
     * Bytes read by `VerifyChecksum()` and `VerifyFileChecksums()` APIs.
     */
    VERIFY_CHECKSUM_READ_BYTES((byte) -0x2C),

    /**
     * Bytes read/written while creating backups
     */
    BACKUP_READ_BYTES((byte) -0x2D),
    BACKUP_WRITE_BYTES((byte) -0x2E),

    /**
     * Remote compaction read/write statistics
     */
    REMOTE_COMPACT_READ_BYTES((byte) -0x2F),
    REMOTE_COMPACT_WRITE_BYTES((byte) -0x30),

    /**
     * Tiered storage related statistics
     */
    HOT_FILE_READ_BYTES((byte) -0x31),
    WARM_FILE_READ_BYTES((byte) -0x32),
    COLD_FILE_READ_BYTES((byte) -0x33),
    HOT_FILE_READ_COUNT((byte) -0x34),
    WARM_FILE_READ_COUNT((byte) -0x35),
    COLD_FILE_READ_COUNT((byte) -0x36),

    /**
     * (non-)last level read statistics
     */
    LAST_LEVEL_READ_BYTES((byte) -0x37),
    LAST_LEVEL_READ_COUNT((byte) -0x38),
    NON_LAST_LEVEL_READ_BYTES((byte) -0x39),
    NON_LAST_LEVEL_READ_COUNT((byte) -0x3A),

    /**
     * Statistics on iterator Seek() (and variants) for each sorted run.
     * i.e a  single user Seek() can result in many sorted run Seek()s.
     * The stats are split between last level and non-last level.
     * Filtered: a filter such as prefix Bloom filter indicate the Seek() would
     * not find anything relevant, so avoided a likely access to data+index
     * blocks.
     */
    LAST_LEVEL_SEEK_FILTERED((byte) -0x3B),
    /**
     * Filter match: a filter such as prefix Bloom filter was queried but did
     * not filter out the seek.
     */
    LAST_LEVEL_SEEK_FILTER_MATCH((byte) -0x3C),
    /**
     * At least one data block was accessed for a Seek() (or variant) on a
     * sorted run.
     */
    LAST_LEVEL_SEEK_DATA((byte) -0x3D),
    /**
     * At least one value() was accessed for the seek (suggesting it was useful),
     * and no filter such as prefix Bloom was queried.
     */
    LAST_LEVEL_SEEK_DATA_USEFUL_NO_FILTER((byte) -0x3E),
    /**
     * At least one value() was accessed for the seek (suggesting it was useful),
     * after querying a filter such as prefix Bloom.
     */
    LAST_LEVEL_SEEK_DATA_USEFUL_FILTER_MATCH((byte) -0x3F),

    /**
     * The same set of stats, but for non-last level seeks.
     */
    NON_LAST_LEVEL_SEEK_FILTERED((byte) -0x40),
    NON_LAST_LEVEL_SEEK_FILTER_MATCH((byte) -0x41),
    NON_LAST_LEVEL_SEEK_DATA((byte) -0x42),
    NON_LAST_LEVEL_SEEK_DATA_USEFUL_NO_FILTER((byte) -0x43),
    NON_LAST_LEVEL_SEEK_DATA_USEFUL_FILTER_MATCH((byte) -0x44),

    /**
     * Number of block checksum verifications
     */
    BLOCK_CHECKSUM_COMPUTE_COUNT((byte) -0x45),

    /**
     * Number of times RocksDB detected a corruption while verifying a block
     * checksum. RocksDB does not remember corruptions that happened during user
     * reads so the same block corruption may be detected multiple times.
     */
    BLOCK_CHECKSUM_MISMATCH_COUNT((byte) -0x46),

    MULTIGET_COROUTINE_COUNT((byte) -0x47),

    /**
     * Time spent in the ReadAsync file system call
     */
    READ_ASYNC_MICROS((byte) -0x48),

    /**
     * Number of errors returned to the async read callback
     */
    ASYNC_READ_ERROR_COUNT((byte) -0x49),

    /**
     * Number of lookup into the prefetched tail (see
     * `TABLE_OPEN_PREFETCH_TAIL_READ_BYTES`)
     * that can't find its data for table open
     */
    TABLE_OPEN_PREFETCH_TAIL_MISS((byte) -0x4A),

    /**
     * Number of lookup into the prefetched tail (see
     * `TABLE_OPEN_PREFETCH_TAIL_READ_BYTES`)
     * that finds its data for table open
     */
    TABLE_OPEN_PREFETCH_TAIL_HIT((byte) -0x4B),

    /**
     * # of times timestamps are checked on accessing the table
     */
    TIMESTAMP_FILTER_TABLE_CHECKED((byte) -0x4C),

    /**
     * # of times timestamps can successfully help skip the table access
     */
    TIMESTAMP_FILTER_TABLE_FILTERED((byte) -0x4D),

    READAHEAD_TRIMMED((byte) -0x4E),

    FIFO_MAX_SIZE_COMPACTIONS((byte) -0x4F),

    FIFO_TTL_COMPACTIONS((byte) -0x50),

    PREFETCH_BYTES((byte) -0x51),

    PREFETCH_BYTES_USEFUL((byte) -0x52),

    PREFETCH_HITS((byte) -0x53),

    TICKER_ENUM_MAX((byte) -0x54);

    private final byte value;

    TickerType(final byte value) {
        this.value = value;
    }

    /**
     * Returns the byte value of the enumerations value
     *
     * @return byte representation
     */
    public byte getValue() {
        return value;
    }

    /**
     * Get Ticker type by byte value.
     *
     * @param value byte representation of TickerType.
     *
     * @return {@link org.rocksdb.TickerType} instance.
     * @throws java.lang.IllegalArgumentException if an invalid
     *     value is provided.
     */
    public static TickerType getTickerType(final byte value) {
        for (final TickerType tickerType : TickerType.values()) {
            if (tickerType.getValue() == value) {
                return tickerType;
            }
        }
        throw new IllegalArgumentException(
            "Illegal value provided for TickerType.");
    }
}
