How to use

longToVarInt64

method

in

com.moz.fiji.schema.util.ByteStreamArray

/**
 * Serializes a long integer into bytes using the zig-zag variable-length encoding scheme.
 *
 * @param number Long integer to encode.
 * @return Zig-zag encoded long, as an array of up to 10 bytes.
 */
public static byte[] longToZigZagVarInt64(long number) {
 // Zig-zag encode: move sign to low-order bit, and flip others if negative
 number = (number << 1) ^ (number >> 63);
 return longToVarInt64(number);
}

 /** {@inheritDoc} */
 @Override
 public void encode(final Schema writerSchema) throws IOException {
  final long schemaId = mCellSpec.getSchemaTable().getOrCreateSchemaId(writerSchema);
  mByteArrayEncoder.writeFixed(ByteStreamArray.longToVarInt64(schemaId));
 }
}

/**
 * Fetches a schema entry from the tables given a schema ID.
 *
 * @param schemaId schema ID
 * @return Avro schema entry, or null if the schema ID does not exist in the table
 * @throws IOException on I/O error.
 */
private SchemaTableEntry loadFromIdTable(long schemaId) throws IOException {
 final Get get = new Get(longToVarInt64(schemaId));
 final Result result = mSchemaIdTable.get(get);
 return result.isEmpty() ? null : decodeSchemaEntry(result.value());
}

/**
 * Writes the given schema entry to the ID and hash tables.
 *
 * This is not protected from concurrent writes. Caller must ensure consistency.
 *
 * @param avroEntry Schema entry to write.
 * @param timestamp Write entries with this timestamp.
 * @param flush Whether to flush tables synchronously.
 * @throws IOException on I/O error.
 */
private void storeInTable(final SchemaTableEntry avroEntry, long timestamp, boolean flush)
  throws IOException {
 final byte[] entryBytes = encodeSchemaEntry(avroEntry);
 // Writes the ID mapping first: if the hash table write fails, we just lost one schema ID.
 // The hash table write must not happen before the ID table write has been persisted.
 // Otherwise, another client may see the hash entry, write cells with the schema ID that cannot
 // be decoded (since the ID mapping has not been written yet).
 final Put putId = new Put(longToVarInt64(avroEntry.getId()))
   .add(SCHEMA_COLUMN_FAMILY_BYTES, SCHEMA_COLUMN_QUALIFIER_BYTES, timestamp, entryBytes);
 mSchemaIdTable.put(putId);
 if (flush) {
  mSchemaIdTable.flushCommits();
 }
 final Put putHash = new Put(avroEntry.getHash().bytes())
   .add(SCHEMA_COLUMN_FAMILY_BYTES, SCHEMA_COLUMN_QUALIFIER_BYTES, timestamp, entryBytes);
 mSchemaHashTable.put(putHash);
 if (flush) {
  mSchemaHashTable.flushCommits();
 }
}