From 3bc9acc2183dc34fca1fb636bc7da734cf00d968 Mon Sep 17 00:00:00 2001
From: Brian Schwind <brianmschwind@gmail.com>
Date: Fri, 24 Jan 2020 23:25:31 +0900
Subject: [PATCH] Use Topic instead of String for matching_subscribers function

---
 src/topic/filter.rs |  6 ++++++
 src/topic/tree.rs   | 49 ++++++++++++++++++++++-----------------------
 2 files changed, 30 insertions(+), 25 deletions(-)

diff --git a/src/topic/filter.rs b/src/topic/filter.rs
index 7d4f49e..185769c 100644
--- a/src/topic/filter.rs
+++ b/src/topic/filter.rs
@@ -204,6 +204,12 @@ impl<'a> TopicFilter {
     }
 }
 
+impl<'a> Topic {
+    pub fn levels(&'a self) -> TopicLevels<'a> {
+        TopicLevels { levels_iter: self.topic_name.split(TOPIC_SEPARATOR) }
+    }
+}
+
 impl<'a> Iterator for TopicLevels<'a> {
     type Item = TopicLevel<'a>;
 
diff --git a/src/topic/tree.rs b/src/topic/tree.rs
index 67a71a8..0187425 100644
--- a/src/topic/tree.rs
+++ b/src/topic/tree.rs
@@ -1,7 +1,4 @@
-use crate::topic::{
-    filter::{TopicFilter, TopicLevel},
-    TOPIC_SEPARATOR,
-};
+use crate::topic::{Topic, TopicFilter, TopicLevel};
 use std::collections::{hash_map::Entry, HashMap};
 
 // TODO(bschwind) - Support shared subscriptions
@@ -33,8 +30,8 @@ impl<T: std::fmt::Debug> SubscriptionTree<T> {
         counter
     }
 
-    pub fn matching_subscribers<'a, F: FnMut(&T)>(&'a self, topic_name: &str, sub_fn: F) {
-        self.root.matching_subscribers(topic_name, sub_fn)
+    pub fn matching_subscribers<'a, F: FnMut(&T)>(&'a self, topic: &Topic, sub_fn: F) {
+        self.root.matching_subscribers(topic, sub_fn)
     }
 
     pub fn remove(&mut self, topic_filter: &TopicFilter, counter: u64) -> Option<T> {
@@ -202,15 +199,15 @@ impl<T: std::fmt::Debug> SubscriptionTreeNode<T> {
         return_val.map(|(_, val)| val)
     }
 
-    fn matching_subscribers<'a, F: FnMut(&T)>(&'a self, topic_name: &str, mut sub_fn: F) {
+    fn matching_subscribers<'a, F: FnMut(&T)>(&'a self, topic: &Topic, mut sub_fn: F) {
         let mut tree_stack = vec![];
-        let levels: Vec<&str> = topic_name.split(TOPIC_SEPARATOR).collect();
+        let levels: Vec<TopicLevel> = topic.levels().collect();
 
         tree_stack.push((self, 0));
 
         while !tree_stack.is_empty() {
             let (current_tree, current_level) = tree_stack.pop().unwrap();
-            let level = levels[current_level];
+            let level = &levels[current_level];
 
             for (_, subscriber) in &current_tree.multi_level_wildcards {
                 sub_fn(subscriber);
@@ -226,15 +223,17 @@ impl<T: std::fmt::Debug> SubscriptionTreeNode<T> {
                 }
             }
 
-            if current_tree.concrete_topic_levels.contains_key(level) {
-                let sub_tree = current_tree.concrete_topic_levels.get(level).unwrap();
+            if let TopicLevel::Concrete(level) = level {
+                if current_tree.concrete_topic_levels.contains_key(*level) {
+                    let sub_tree = current_tree.concrete_topic_levels.get(*level).unwrap();
 
-                if current_level + 1 < levels.len() {
-                    let sub_tree = current_tree.concrete_topic_levels.get(level).unwrap();
-                    tree_stack.push((sub_tree, current_level + 1));
-                } else {
-                    for (_, subscriber) in &sub_tree.subscribers {
-                        sub_fn(subscriber);
+                    if current_level + 1 < levels.len() {
+                        let sub_tree = current_tree.concrete_topic_levels.get(*level).unwrap();
+                        tree_stack.push((sub_tree, current_level + 1));
+                    } else {
+                        for (_, subscriber) in &sub_tree.subscribers {
+                            sub_fn(subscriber);
+                        }
                     }
                 }
             }
@@ -265,26 +264,26 @@ mod tests {
 
         println!("{:#?}", sub_tree);
 
-        sub_tree.matching_subscribers("home/kitchen", |s| {
+        sub_tree.matching_subscribers(&"home/kitchen".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
-        sub_tree.matching_subscribers("home/kitchen/humidity", |s| {
+        sub_tree.matching_subscribers(&"home/kitchen/humidity".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
-        sub_tree.matching_subscribers("office/stairwell/temperature", |s| {
+        sub_tree.matching_subscribers(&"office/stairwell/temperature".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
         sub_tree.matching_subscribers(
-            "office/tokyo/shibuya/some_desk/cpu_1/fan_speed/blade_4/temperature",
+            &"office/tokyo/shibuya/some_desk/cpu_1/fan_speed/blade_4/temperature".parse().unwrap(),
             |s| {
                 println!("{}", s);
             },
@@ -292,25 +291,25 @@ mod tests {
 
         println!();
 
-        sub_tree.matching_subscribers("home", |s| {
+        sub_tree.matching_subscribers(&"home".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
-        sub_tree.matching_subscribers("sport/tennis/player1", |s| {
+        sub_tree.matching_subscribers(&"sport/tennis/player1".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
-        sub_tree.matching_subscribers("sport/tennis/player2", |s| {
+        sub_tree.matching_subscribers(&"sport/tennis/player2".parse().unwrap(), |s| {
             println!("{}", s);
         });
 
         println!();
 
-        sub_tree.matching_subscribers("sport/tennis/player1/ranking", |s| {
+        sub_tree.matching_subscribers(&"sport/tennis/player1/ranking".parse().unwrap(), |s| {
             println!("{}", s);
         });
     }