access_pattern() = sequential | random
holds static or rarely changing fields
segment_ref() = {From::ra_index(), To::ra_index(), File::string()}
abstract datatype: state()
close(X1::state()) -> ok
closed_mem_tables(X1::state()) -> list()
delete_closed_mem_table_object(X1::state(), Id::term()) -> true
fetch_term(Idx::ra_index(), State0::state()) -> {ra_index(), state()}
handle_log_update(X1::{ra_log_update, undefined | pid(), ra_index(), [segment_ref()]}, State::state()) -> state()
init(UId::ra_uid(), Dir::file:filename(), FirstIdx::ra_index(), MaxOpen::non_neg_integer(), SegRefs::[segment_ref()], Names::ra_system:names()) -> state()
init(UId::ra_uid(), Dir::file:filename(), FirstIdx::ra_index(), MaxOpen::non_neg_integer(), AccessPattern::access_pattern(), SegRefs::[segment_ref()], X7::ra_system:names(), Counter::undefined | counters:counters_ref()) -> state()
num_open_segments(X1::state()) -> non_neg_integer()
open_mem_table_lookup(X1::state()) -> list()
read(From::ra_index(), To::ra_index(), State::state()) -> {[log_entry()], NumRead::non_neg_integer(), state()}
read(From::ra_index(), To::ra_index(), State::state(), Entries::[log_entry()]) -> {[log_entry()], NumRead::non_neg_integer(), state()}
segment_refs(X1::state()) -> [segment_ref()]
sparse_read(State::state(), Indexes0::[ra_index()], Entries0::[log_entry()]) -> {[log_entry()], state()}
update_first_index(Idx::ra_index(), State::state()) -> {state(), [segment_ref()]}
update_segments(NewSegmentRefs::[segment_ref()], State::state()) -> state()
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