Add local map to store data

Author: simonwep

src/express/Express.java

@@ -14,6 +14,7 @@
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 
@@ -25,6 +26,8 @@
  */
 public class Express extends ExpressMiddleware {
 
+  private final ConcurrentHashMap<Object, Object> LOCALS = new ConcurrentHashMap<>();
+
   private final ArrayList<ExpressFilterWorker> WORKER = new ArrayList<>();
   private final ExpressFilterChain MIDDLEWARE_CHAIN = new ExpressFilterChain();
   private final ExpressFilterChain FILTER_CHAIN = new ExpressFilterChain();
@@ -46,6 +49,34 @@ public Express(String hostname) {
     this.executor = Executors.newCachedThreadPool();
   }
 
+  /**
+   * Default, will bind the server to "localhost"
+   */
+  public Express() {
+  }
+
+  /**
+   * Add an key-val pair to the express app, can be used
+   * to store data. Uses ConcurrentHashMap so it's thread save.
+   *
+   * @param key The key
+   * @param val The value
+   * @return The last value which was attached by this key, can be null.
+   */
+  public Object set(Object key, Object val) {
+    return LOCALS.put(key, val);
+  }
+
+  /**
+   * Returns the value which was allocated by this key.
+   *
+   * @param key The key.
+   * @return The value.
+   */
+  public Object get(Object key) {
+    return LOCALS.get(key);
+  }
+
   /**
    * Set an executor service. Default is CachedThreadPool
    * Can only changed if the server isn't already stardet.
@@ -61,12 +92,6 @@ public void setExecutor(Executor executor) throws IOException {
     }
   }
 
-  /**
-   * Default, will bind the server to "localhost"
-   */
-  public Express() {
-  }
-
   /**
    * Add an middleware which will be firea BEFORE EACH request-type listener will be fired.
    *