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Operations are only ever constructed by the dependency resolver, so a
plugin has no way to inject an implementation of its own and the set is
closed. Modelling it as an enum, like AnyPackage, removes the
OperationInterface trait together with its two parallel downcast
mechanisms (as_any() + downcast_ref, and as_*_operation()) and the
get_package() default method that panicked on UpdateOperation.
The PHP idiom `$op instanceof UpdateOperation ? getTargetPackage() :
getPackage()`, written out at six call sites, becomes
AnyOperation::get_target_package(). InstallationManager's three blocks
that matched on the type string and then recovered the type with
expect() collapse into exhaustive matches.
SolverOperation keeps only its TYPE constant; the shared
getOperationType()/__toString() implementations move to AnyOperation,
which also drops the five Self::TYPE.to_string() allocations.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Extract a superclass-trait EventInterface from the base Event.
pool_builder's PrePoolCreateEvent stays deferred: its constructor needs
owned, non-cloneable Request and repository boxes the builder only holds
by reference (owned-payload blocker). The event is plugin-only, so its
construction is re-tagged TODO(plugin).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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OperationInterface::clone_box (a todo!() trait-object clone stub) is
removed in favor of Rc<dyn OperationInterface> shared ownership. All its
methods are &self, so operations are immutable value objects that Rc can
share; pushing the same operation into multiple lists (installer's
install/uninstall splits) becomes a cheap Rc clone instead of clone_box.
Box<dyn OperationInterface> is replaced with Rc<dyn ...> across
Transaction (and its Lock/LocalRepo wrappers), Installer, PackageEvent,
InstallationManager and EventDispatcher; Box::new operation constructions
become Rc::new.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Model PHP's `Composer extends PartialComposer` as a PartialOrFullComposer
enum and merge partial_composer.rs into composer.rs. Introduce
ComposerHandle / PartialComposerHandle (plus their Weak variants) so the
graph can be shared, and build it at once with Rc::new_cyclic in the
factory to resolve the back-reference cycles.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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