Slide 8
Slide 8 text
def transaction(read_only = false) # :yields: pstore
value = nil
begin
@lock.lock
rescue ThreadError
raise PStore::Error, "nested transaction"
end
begin
@rdonly = read_only
@abort = false
file = open_and_lock_file(@filename, read_only)
if file
begin
@table, checksum, original_data_size = load_data(file, read_only)
catch(:pstore_abort_transaction) do
value = yield(self)
end
if !@abort && !read_only
save_data(checksum, original_data_size, file)
end
ensure
file.close if !file.closed?
end
else
# This can only occur if read_only == true.
@table = {}
catch(:pstore_abort_transaction) do
value = yield(self)
end
end
ensure
@lock.unlock
end
value
end
13-05-08