fn make_room_for_write()

in common/rusty_leveldb_sgx/src/db_impl.rs [579:604]

• 24 lines of code
• 5 McCabe index (conditional complexity)

    fn make_room_for_write(&mut self, force: bool) -> Result<()> {
        if !force && self.mem.approx_mem_usage() < self.opt.write_buffer_size {
            Ok(())
        } else if self.mem.len() == 0 {
            Ok(())
        } else {
            // Create new memtable.
            let logn = self.vset.borrow_mut().new_file_number();
            let logf = self
                .opt
                .env
                .open_writable_file(Path::new(&log_file_name(&self.path, logn)));
            if logf.is_err() {
                self.vset.borrow_mut().reuse_file_number(logn);
                Err(logf.err().unwrap())
            } else {
                self.log = Some(LogWriter::new(BufWriter::new(logf.unwrap())));
                self.log_num = Some(logn);

                let mut imm = MemTable::new(self.opt.cmp.clone());
                mem::swap(&mut imm, &mut self.mem);
                self.imm = Some(imm);
                self.maybe_do_compaction()
            }
        }
    }