Object table remove (#139)

* Object table remove redis module

* Test case for object table remove redis module

* Client code for object_table_remove

* Delete object notifications in plasma

* Test for object deletion notifications

* Fix subscribe deletion test

* Address Robert's comments

* free hash table entry

src/photon/photon_algorithm.c

@@ -337,6 +337,16 @@ void handle_object_available(local_scheduler_state *state,
   }
 }
 
+void handle_object_removed(local_scheduler_state *state, object_id object_id) {
+  scheduling_algorithm_state *algorithm_state = state->algorithm_state;
+  available_object *entry;
+  HASH_FIND(handle, algorithm_state->local_objects, &object_id,
+            sizeof(object_id), entry);
+  if (entry != NULL) {
+    HASH_DELETE(handle, algorithm_state->local_objects, entry);
+  }
+}
+
 int num_tasks_in_queue(scheduling_algorithm_state *algorithm_state) {
   task_queue_entry *elt;
   int count;

src/photon/photon_algorithm.h

@@ -70,6 +70,15 @@ void handle_object_available(local_scheduler_state *state,
                              scheduling_algorithm_state *algorithm_state,
                              object_id object_id);
 
+/**
+ * This function is called if an object is removed from the local plasma store.
+ *
+ * @param state The state of the local scheduler.
+ * @param object_id ID of the object that was removed.
+ * @return Void.
+ */
+void handle_object_removed(local_scheduler_state *state, object_id object_id);
+
 /**
  * This function is called when a new worker becomes available
  *

src/photon/photon_scheduler.c

@@ -122,7 +122,12 @@ void process_plasma_notification(event_loop *loop,
     close(client_sock);
     return;
   }
-  handle_object_available(state, state->algorithm_state, object_info.obj_id);
+
+  if (object_info.is_deletion) {
+    handle_object_removed(state, object_info.obj_id);
+  } else {
+    handle_object_available(state, state->algorithm_state, object_info.obj_id);
+  }
 }
 
 void reconstruct_object_task_lookup_callback(object_id reconstruct_object_id,