Another small library today.

PersistentEts

Hex: persistent_ets | Hex
GitHub: GitHub - michalmuskala/persistent_ets · GitHub

Ets table backed by a persistence file.

The table is persisted using the :ets.file2tab/2 and :ets.tab2file/3 functions.

Table is to be created with PersistentEts.new/3 in place of :ets.new/2. After that all functions from :ets can be used like with any other table, except :ets.give_away/3 and :ets.delete/1 - replacement functions are provided in this module. The :ets.setopts/2 function to change the heir is not supported - the heir setting is leveraged by the persistence mechanism.

Like with regular ets table, the table is destroyed once the owning process (the one that called PersistentEts.new/3) dies, but the table data is persisted so it will be re-read when table is opened again.

Example

pid = spawn(fn -> 
  :foo = PersistentEts.new(:foo, "table.tab", [:named_table])
  :ets.insert(:foo, [a: 1])
end)
Process.exit(pid, :diediedie)
PersistentEts.new(:foo, "table.tab", [:named_table])
[a: 1] = :ets.tab2list(:foo)