Implement store-unload hooks

libimagstore/src/configuration.rs

@@ -117,7 +117,10 @@ pub fn config_is_valid(config: &Option<Value>) -> bool {
     }
 
     match *config {
-        Some(Value::Table(ref t)) => {            has_key_with_string_ary(t, "pre-create-hook-aspects")      &&
+        Some(Value::Table(ref t)) => {
+            has_key_with_string_ary(t, "store-unload-hook-aspects")    &&
+
+            has_key_with_string_ary(t, "pre-create-hook-aspects")      &&
             has_key_with_string_ary(t, "post-create-hook-aspects")     &&
             has_key_with_string_ary(t, "pre-retrieve-hook-aspects")    &&
             has_key_with_string_ary(t, "post-retrieve-hook-aspects")   &&
@@ -143,6 +146,10 @@ pub fn config_is_valid(config: &Option<Value>) -> bool {
     }
 }
 
+pub fn get_store_unload_aspect_names(value: &Option<Value>) -> Vec<String> {
+    get_aspect_names_for_aspect_position("store-unload-hook-aspects", value)
+}
+
 pub fn get_pre_create_aspect_names(value: &Option<Value>) -> Vec<String> {
     get_aspect_names_for_aspect_position("pre-create-hook-aspects", value)
 }

libimagstore/src/hook/position.rs

@@ -1,5 +1,7 @@
 #[derive(Debug, Clone)]
 pub enum HookPosition {
+    StoreUnload,
+
     PreCreate,
     PostCreate,
     PreRetrieve,

libimagstore/src/store.rs

@@ -171,6 +171,8 @@ pub struct Store {
      * Registered hooks
      */
 
+    store_unload_aspects  : Arc<Mutex<Vec<Aspect>>>,
+
     pre_create_aspects    : Arc<Mutex<Vec<Aspect>>>,
     post_create_aspects   : Arc<Mutex<Vec<Aspect>>>,
     pre_retrieve_aspects  : Arc<Mutex<Vec<Aspect>>>,
@@ -216,6 +218,12 @@ impl Store {
             return Err(SE::new(SEK::StorePathExists, None));
         }
 
+        let store_unload_aspects = get_store_unload_aspect_names(&store_config)
+            .into_iter().map(|n| {
+                let cfg = AspectConfig::get_for(&store_config, n.clone());
+                Aspect::new(n, cfg)
+            }).collect();
+
         let pre_create_aspects = get_pre_create_aspect_names(&store_config)
             .into_iter().map(|n| {
                 let cfg = AspectConfig::get_for(&store_config, n.clone());
@@ -265,8 +273,11 @@ impl Store {
             }).collect();
 
         let store = Store {
-            location: location,
+            location: location.clone(),
             configuration: store_config,
+
+            store_unload_aspects  : Arc::new(Mutex::new(store_unload_aspects)),
+
             pre_create_aspects    : Arc::new(Mutex::new(pre_create_aspects)),
             post_create_aspects   : Arc::new(Mutex::new(post_create_aspects)),
             pre_retrieve_aspects  : Arc::new(Mutex::new(pre_retrieve_aspects)),
@@ -544,6 +555,8 @@ impl Store {
         debug!("     with aspect: {:?}", aspect_name);
 
         let guard = match position {
+                HookPosition::StoreUnload  => self.store_unload_aspects.clone(),
+
                 HookPosition::PreCreate    => self.pre_create_aspects.clone(),
                 HookPosition::PostCreate   => self.post_create_aspects.clone(),
                 HookPosition::PreRetrieve  => self.pre_retrieve_aspects.clone(),
@@ -649,6 +662,12 @@ impl Drop for Store {
      * TODO: Unlock them
      */
     fn drop(&mut self) {
+        let store_id = StoreId::from(self.location.clone());
+        if let Err(e) = self.execute_hooks_for_id(self.store_unload_aspects.clone(), &store_id) {
+            debug!("Store-load hooks execution failed. Cannot create store object.");
+            warn!("Store Unload Hook error: {:?}", e);
+        }
+
         debug!("Dropping store");
     }
 

libimagstorestdhook/src/debug.rs

@@ -43,6 +43,7 @@ impl HookDataAccessorProvider for DebugHook {
         use libimagstore::hook::accessor::HookDataAccessor as HDA;
 
         match self.position {
+            HP::StoreUnload  |
             HP::PreCreate    |
             HP::PreRetrieve  |
             HP::PreDelete    |