From: eregontp@... Date: 2017-09-20T11:01:28+00:00 Subject: [ruby-core:82895] [Ruby trunk Feature#13923] Idiom to release resources safely, with less indentations Issue #13923 has been updated by Eregon (Benoit Daloze). tagomoris (Satoshi TAGOMORI) wrote: > With this code, storage will not be closed if `buffer.close` raises exceptions. IMHO if buffer.close raises an exception then that should be fixed and not silently ignored. (e.g. if close fails it could mean the contents is not properly flushed and might be very hard to debug). A more common way to write code using resources in Ruby is to use blocks: File.open("foo") do |file| file.read end ---------------------------------------- Feature #13923: Idiom to release resources safely, with less indentations https://bugs.ruby-lang.org/issues/13923#change-66794 * Author: tagomoris (Satoshi TAGOMORI) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- In programs which grabs and releases resources very often, we need to write so much begin-ensure clauses. ```ruby begin storage = getStorage() begin buffer = storage.get(buffer_id) # ... ensure buffer.close if buffer end rescue StorageError => e # ... ensure storage.close if storage end ``` Such code makes our code fat, and difficult to understand. I want to write such code like below: ```ruby # Class of storage and buffer should include a module (like Closeable) # or be checked with respond_to?(:close) begin(storage = getStorage(); buffer = storage.get(buffer_id) # ... rescue StorageError => e # ... end # (buffer.close if buffer) rescue nil # (storage.close if storage) rescue nil ``` Other languages also have similar features: * Java: try-with-resources * Python: with -- https://bugs.ruby-lang.org/ Unsubscribe: