refactor(composer): hold managers behind *Interface traits

Composer/PartialComposer exposed its RepositoryManager, InstallationManager,
EventDispatcher, Locker, DownloadManager, AutoloadGenerator and ArchiveManager
as concrete types, but Composer's public setters (setDownloadManager() etc.)
let plugins swap in subclasses. Introduce a *Interface trait per manager and
store each as Rc<RefCell<dyn ...Interface>> so a replacement is honored.

Only Composer's slots and the sinks fed from its accessors become trait
objects; managers injected concretely at construction keep their concrete
references, matching PHP semantics. Fluent setters on the affected classes now
return () and Locker::update_hash is de-generified to a boxed FnOnce so the
traits stay object-safe.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/crates/shirabe/src/dependency_resolver/pool_builder.rs b/crates/shirabe/src/dependency_resolver/pool_builder.rs
index e2c5b11..843818f 100644
--- a/crates/shirabe/src/dependency_resolver/pool_builder.rs
+++ b/crates/shirabe/src/dependency_resolver/pool_builder.rs
@@ -19,7 +19,7 @@ use crate::dependency_resolver::Pool;
 use crate::dependency_resolver::PoolOptimizer;
 use crate::dependency_resolver::Request;
 use crate::dependency_resolver::SecurityAdvisoryPoolFilter;
-use crate::event_dispatcher::EventDispatcher;
+use crate::event_dispatcher::EventDispatcherInterface;
 use crate::io::IOInterface;
 use crate::io::IOInterfaceImmutable;
 use crate::package::AliasPackageHandle;
@@ -40,7 +40,7 @@ pub struct PoolBuilder {
     root_aliases: IndexMap<String, IndexMap<String, IndexMap<String, String>>>,
     root_references: IndexMap<String, String>,
     temporary_constraints: IndexMap<String, AnyConstraint>,
-    event_dispatcher: Option<std::rc::Rc<std::cell::RefCell<EventDispatcher>>>,
+    event_dispatcher: Option<std::rc::Rc<std::cell::RefCell<dyn EventDispatcherInterface>>>,
     pool_optimizer: Option<PoolOptimizer>,
     io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
     alias_map: IndexMap<String, IndexMap<i64, AliasPackageHandle>>,
@@ -85,7 +85,7 @@ impl PoolBuilder {
         root_aliases: IndexMap<String, IndexMap<String, IndexMap<String, String>>>,
         root_references: IndexMap<String, String>,
         io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
-        event_dispatcher: Option<std::rc::Rc<std::cell::RefCell<EventDispatcher>>>,
+        event_dispatcher: Option<std::rc::Rc<std::cell::RefCell<dyn EventDispatcherInterface>>>,
         pool_optimizer: Option<PoolOptimizer>,
         temporary_constraints: IndexMap<String, AnyConstraint>,
         security_advisory_pool_filter: Option<SecurityAdvisoryPoolFilter>,