Update API Reference

API-Reference.md

@@ -4,17 +4,28 @@ This page summarizes the key classes in **Conflux**.
 
 ## Ctx
 
-- `put(Key<T>, T value)` — store or update a value for a key
-- `get(Key<T>)` — retrieve a value
-- `contains(Key<?>)` — check if a key is present
-- `remove(Key<?>)` — remove a key and its listeners
-- `clear()` — remove everything
-- `addListener(Key<T>, Listener<T>)` — register a weakly referenced listener
-- `removeListener(Key<T>, Listener<T>)` — remove a listener
+`Ctx` is a singleton enum that serves as the primary access point for the default application-wide context. It also supports managing multiple independent named contexts.
+
+### Default Context Operations
+
+- `put(Key<T>, T value)` — store or update a value for a key in the default context
+- `get(Key<T>)` — retrieve a value from the default context
+- `contains(Key<?>)` — check if a key is present in the default context
+- `remove(Key<?>)` — remove a key and its listeners from the default context
+- `clear()` — clear all keys and listeners from the default context
+- `addListener(Key<T>, Listener<T>)` — register a weakly referenced listener in the default context
+- `removeListener(Key<T>, Listener<T>)` — remove a listener from the default context
+
+### Managing Multiple Named Contexts
+
+- `getContext(String name)` — retrieve or create a named independent context implementing `CtxInterface`
+- `contextNames()` — returns the set of existing named context keys
+
+Each named context functions independently with its own keys, values, and listeners, allowing isolated storage scopes within the same application.
 
 ## Key
 
-A strongly typed key:
+A strongly typed key used to identify context entries:
 
 ```java
 Key<String> nameKey = new Key<>("name", String.class);
@@ -23,9 +34,11 @@ Key<String> nameKey = new Key<>("name", String.class);
 * `name()` returns the key name
 * `type()` returns the key type
 
+Keys ensure type consistency and prevent accidental type mismatches.
+
 ## Listener
 
-An interface for change notifications:
+An interface for receiving notifications on value changes:
 
 ```java
 public interface Listener<T> {
@@ -33,7 +46,7 @@ public interface Listener<T> {
 }
 ```
 
-Registered listeners will be weakly referenced and called on value change.
+Listeners are weakly referenced to avoid memory leaks and invoked whenever the corresponding key's value changes.
 
 ---
-[[Home]] | [[Programming Guide]] | [[Design and Architecture]] | [[FAQ]] | [[Contributing]]
+[[Home]] | [[Programming Guide]] | [[Design and Architecture]] | [[FAQ]] | [[Contributing]]