From c58ff1cc532b267c901d7f573bc1091695d6b70d Mon Sep 17 00:00:00 2001
From: HerbertYiga <herbertyiga24@gmail.com>
Date: Mon, 1 Mar 2021 22:33:56 +0300
Subject: [PATCH] RA-552:Adding the View Logged in Users functionality to core

---
 .../java/org/openmrs/util/CurrentUsers.java   | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 api/src/main/java/org/openmrs/util/CurrentUsers.java

diff --git a/api/src/main/java/org/openmrs/util/CurrentUsers.java b/api/src/main/java/org/openmrs/util/CurrentUsers.java
new file mode 100644
index 000000000000..ba9b37e3c367
--- /dev/null
+++ b/api/src/main/java/org/openmrs/util/CurrentUsers.java
@@ -0,0 +1,67 @@
+package org.openmrs.util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+import javax.servlet.http.HttpSession;
+
+public class CurrentUsers {
+	
+	/**
+	 * Initialize the current users list.
+	 * 
+	 * @param servletContext
+	 */
+	
+	public static Map<String,String> init(ServletContext servletContext){
+		Map<String,String> currentUserMap = Collections.synchronizedMap(new TreeMap<String,String>());
+		servletContext.setAtrribute(WebConstants.CURRENT_USERS,currentUserMap);
+		return currentUserMap;
+	}
+	
+	/**
+	 * Get the current list of map of users stored in the session
+	 * 
+	 * @param httpSession the current session
+	 * @return map of users logged in
+	 */
+	private static Map<String,String> getCurrentUsers(HttpSession httpSession){
+		
+		Map<String,String> currentUsers = (Map <String,String>) httpSession.getServletContext().getAttribute(WebConstants.CURRENT_USERS);
+		if(currentUsers == null) {
+			
+			currentUsers = init(httpSession.getServletContext());
+		}
+		
+		return currentUsers;
+	}
+
+	/**
+	 * Get sorted user names list.
+	 * 
+	 * @param httpSession
+	 * @return sorted user names
+	 */
+	
+	public static List<String> getCurrentUsernames(HttpSession httpSession){
+		
+		Map<String,String> currentUsers = getCurrentUsers(httpSession);
+		
+		List<String> userNames = new ArrayList<String>();
+		synchronized(currentUsers){
+			
+			for(String value:currentUsers.values()) {
+				
+				userNames.add(value);
+			 }
+		
+		 }
+		
+		Collections.sort(userNames);
+		return userNames;
+    }
+	
+
+}