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with_advisory_lock is a Ruby gem that provides a simple and thread-safe way to use PostgreSQL advisory locks within Ruby applications. It allows developers to wrap critical code sections with database-level locks to prevent race conditions across concurrent processes or threads. It’s especially useful in distributed systems, background job processing, or scheduled tasks where application-level mutexes aren't sufficient.

Library serializing Ruby objects, optimized in many ways: * Fast and small: use MessagePack (binary compact storage) and don't serialize twice the same object * Independent of Ruby version: dump and load data across different versions * Keep shared objects: if an object is shared by others, serialization still keeps the reference and does not duplicate objects in memory * Gives the ability to fine tune which attributes of your objects are to be serialized (defaults to all) * Keeps backward compatibility with previously serialized versions * Has callbacks support to fine tune the serialization process * Can serialize objects having reference cycles (self-contained Arrays, Hashes, objects...)