BlocSignal Offers Clean One-Shot UI Side Effects Without Extra Flutter Packages

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Flutter developers commonly face a 'Sticky State Dilemma' where transient UI events like snackbars or dialogs re-trigger unintentionally after widget tree rebuilds caused by screen rotation or keyboard activity. Traditional BLoC-based workarounds — such as emitting reset states or embedding UI flags inside domain state classes — introduce rebuild overhead and pollute business logic. A third-party package called bloc_presentation addressed this by adding a separate broadcast stream to BLoCs, but it adds versioning and dependency management costs. BlocSignal tackles the problem differently by making state propagation synchronous, settling updates within the same frame and eliminating the need for secondary presentation streams in many cases. This allows one-shot side effects like navigation or dialogs to be handled directly in UI callbacks, keeping domain state clean and free of ephemeral UI concerns.

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Zenoh put/get race condition in Elixir causes stale reads 3.9% of the time

A developer experimenting with Zenoh's put/get storage feature via Elixir bindings (Zenohex) discovered a read-after-write race condition where a get issued immediately after a put occasionally returns a stale value. In a 2,000-iteration test loop, roughly 78 reads (3.9%) retrieved outdated data, though querying again just ~1ms later consistently returned the correct value. The root cause is an asymmetry in Zenoh's design: put is fire-and-forget at the NIF level, while get is a true request/response operation, creating a brief window before a write becomes visible. The developer built a workaround called ZenohAckPut — an application-level wrapper that confirms a write by re-querying until the expected value is returned — which eliminated stale reads entirely in the same test. The fix is available as an open-source Elixir module on GitHub, and the author notes the underlying gap remains unresolved upstream in Zenoh itself.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

Harness Engineering Part 8: Why Observability Is Essential for AI Agents

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ProgrammingDEV Community ·

Layer-by-Layer Network Troubleshooting: A Structured Approach to Fixing HTTPS Failures

Effective network troubleshooting relies on a structured mental model that examines each layer of a connection stack in a specific order. When a request fails, engineers should verify from the ground up — starting with the network interface and IP address, then routing, gateway reachability, DNS resolution, port connectivity, and TLS before examining the application layer. Each lower layer must be confirmed healthy before moving up, since a broken foundation produces misleading symptoms at higher levels. Key tools include ip addr, dig, nc, and openssl s_client, each targeting a distinct layer with clear pass-or-fail signals. Distinguishing a refused connection from a timeout, for instance, immediately reveals whether a packet reached its destination or was silently dropped by a firewall.

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