CopyFileWithRetry (System/SharedFileCopy.mqh) and CModelPersistence::
LoadNetWithRetry independently implemented the identical 5-attempt
Sleep-doubled-and-capped retry shape around a different single
operation, with a comment on the latter pointing at the former as the
"same reasoning" instead of sharing code. Added System/RetryWithBackoff.mqh:
an IRetryableOp interface (one bool TryOnce(bool quiet) method, MQL5 has
no closures/function pointers that bind per-call-site arguments) plus the
RetryWithBackoff(op, attempts, initialDelayMs, delayCapMs) loop. Each call
site now defines a tiny local operand class (CCopySharedFileOp,
CLoadNetOnceOp) and keeps its own tuning constants (150ms/1000ms cap vs
200ms/2000ms cap) unchanged - pure mechanical relocation, no behavior
change. CModelPersistence stays stateless (grep-verified in the prior
Persistence extraction): CLoadNetOnceOp is a separate local class, not a
new member on CModelPersistence itself.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Neither ever touched a CExpertSignalAIBase member - both take everything as
parameters. Moved to System\SharedFileCopy.mqh (free functions, same doctrine as
TradeChecks.mqh's TC*), matching what they actually are instead of carrying them as
methods on a class they don't depend on. Topology.mqh's call sites are unchanged -
unqualified calls from within a class method resolve to the free function exactly
the same way. Compiled clean.
Correction to project_oop_module_pattern's Persistence(696) note: LoadNetWithRetry
is NOT a third pure utility alongside these two - it touches Net/dError/dUndefine/
dForecast/dtStudied/m_activeFileName/m_activeFileCommon/m_eraCount/m_trainingComplete.
The rest of Persistence.mqh (EnforceTopologyContract, Save/LoadModelStats,
ValidateCpuInference, Save/LoadAndCompareTopologyConfiguration, ReadAltDataPinFromCfg)
is heavily coupled to signal state - a real view+adapter extraction on the scale of
ChartUI's, not attempted here.
