diff --git a/src/cache.rs b/src/cache.rs
index 37db7ec..6f210ea 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -6,6 +6,7 @@ use std::error::Error;
 
 use serde::{Deserialize, Serialize};
 use async_trait::async_trait;
+use url::Url;
 
 use crate::traits::CalDavSource;
 use crate::Calendar;
@@ -88,6 +89,23 @@ impl CalDavSource for Cache {
             .collect()
         )
     }
+
+    async fn get_calendar(&self, url: Url) -> Option<&Calendar> {
+        for cal in &self.data.calendars {
+            if cal.url() == &url {
+                return Some(cal);
+}
+        }
+        return None;
+    }
+    async fn get_calendar_mut(&mut self, url: Url) -> Option<&mut Calendar> {
+        for cal in &mut self.data.calendars {
+            if cal.url() == &url {
+                return Some(cal);
+            }
+        }
+        return None;
+    }
 }
 
 
diff --git a/src/traits.rs b/src/traits.rs
index 2fc9e38..9d09050 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -1,6 +1,7 @@
 use std::error::Error;
 
 use async_trait::async_trait;
+use url::Url;
 
 use crate::Calendar;
 
@@ -9,8 +10,18 @@ pub trait CalDavSource {
     /// Returns the current calendars that this source contains
     /// This function may trigger an update (that can be a long process, or that can even fail, e.g. in case of a remote server)
     async fn get_calendars(&self) -> Result<&Vec<Calendar>, Box<dyn Error>>;
-
     /// Returns the current calendars that this source contains
     /// This function may trigger an update (that can be a long process, or that can even fail, e.g. in case of a remote server)
     async fn get_calendars_mut(&mut self) -> Result<Vec<&mut Calendar>, Box<dyn Error>>;
+
+    //
+    //
+    // TODO: find a better search key (do calendars have a unique ID?)
+    // TODO: search key should be a reference
+    //
+    /// Returns the calendar matching the URL
+    async fn get_calendar(&self, url: Url) -> Option<&Calendar>;
+    /// Returns the calendar matching the URL
+    async fn get_calendar_mut(&mut self, url: Url) -> Option<&mut Calendar>;
+
 }