Node.js table unpin

packages/perspective/src/js/perspective.node.js

@@ -263,27 +263,58 @@ class WebSocketServer extends Server {
         }
     }
 
+    _host(cache, name, input) {
+        if (cache[name] !== undefined) {
+            throw new Error(`"${name}" already exists`);
+        }
+        input.on_delete(() => {
+            delete cache[name];
+        });
+        cache[name] = input;
+    }
+
     /**
-     * Expose a Perspective table through the WebSocket, allowing it to be
-     * accessed by a unique name.
+     * Expose a Perspective `table` through the WebSocket, allowing
+     * it to be accessed by a unique name from a client.  Hosted objects
+     * are automatically `eject`ed when their `delete()` method is called.
      *
      * @param {String} name
-     * @param {Perspective.table} table
+     * @param {perspective.table} table `table` to host.
      */
     host_table(name, table) {
-        this._tables[name] = table;
-        table.view({columns: []});
+        this._host(this._tables, name, table);
     }
 
     /**
-     * Expose a Perspective view through the WebSocket, allowing it to be
-     * accessed by a unique name.
+     * Expose a Perspective `view` through the WebSocket, allowing
+     * it to be accessed by a unique name from a client.  Hosted objects
+     * are automatically `eject`ed when their `delete()` method is called.
      *
      * @param {String} name
-     * @param {Perspective.view} view
+     * @param {perspective.view} view `view` to host.
      */
     host_view(name, view) {
-        this._views[name] = view;
+        this._host(this._views, name, view);
+    }
+
+    /**
+     * Cease hosting a `table` on this server.  Hosted objects
+     * are automatically `eject`ed when their `delete()` method is called.
+     *
+     * @param {String} name
+     */
+    eject_table(name) {
+        delete this._tables[name];
+    }
+
+    /**
+     * Cease hosting a `view` on this server.  Hosted objects
+     * are automatically `eject`ed when their `delete()` method is called.
+     *
+     * @param {String} name
+     */
+    eject_view(name) {
+        delete this._views[name];
     }
 
     close() {