RA-552:Adding the View Logged in Users functionality to core

api/src/main/java/org/openmrs/util/CurrentUsers.java

@@ -0,0 +1,44 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
+ * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
+ *
+ * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
+ * graphic logo is a trademark of OpenMRS Inc.
+ */
+package org.openmrs.util;
+
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import org.openmrs.User;
+import org.openmrs.UserSessionListener;
+import org.openmrs.api.context.Context;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CurrentUsers implements UserSessionListener {
+
+	private static Set<String> currentlyLoggedInUsers = Collections.synchronizedSet(new LinkedHashSet(500));
+
+	@Override
+	public void loggedInOrOut(User user, Event event, Status status) {
+		if(!(status == Status.SUCCESS)) {
+			return;
+		}
+		if (event != null && user != null) {
+		    if(event == Event.LOGIN) {
+
+			currentlyLoggedInUsers.add(user.getUsername());
+		    } else if(event == Event.LOGOUT) {
+
+			 currentlyLoggedInUsers.remove(user.getUsername());
+			}
+		}
+	}
+	public static  Set<String> getCurrentUsernames(){
+		return Collections.unmodifiableSet(new LinkedHashSet(currentlyLoggedInUsers));
+	}
+
+}

api/src/test/java/org/openmrs/util/CurrentUsersTest.java

@@ -0,0 +1,40 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
+ * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
+ *
+ * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
+ * graphic logo is a trademark of OpenMRS Inc.
+ */
+package org.openmrs.util;
+
+import java.util.Set;
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+import org.openmrs.User;
+import org.openmrs.api.UserService;
+import org.openmrs.api.context.Context;
+import org.openmrs.api.context.Credentials;
+import org.openmrs.api.context.UsernamePasswordCredentials;
+import org.openmrs.test.jupiter.BaseContextSensitiveTest;
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class CurrentUsersTest extends BaseContextSensitiveTest {
+	private static final String USER_SET = "org/openmrs/util/CurrentUserTest.xml";
+	@Autowired
+	UserService userService;
+
+	@Test
+	public void getCurrentUsernames_shouldReturnUserNamesForLoggedInUsers() {
+		executeDataSet(USER_SET);
+		User user = userService.getUser(5508);
+		Credentials credentials = new UsernamePasswordCredentials("Mukembo","Mukembo123");
+		Context.authenticate(credentials);
+		Assert.assertEquals(Context.getAuthenticatedUser().getUsername(),user.getUsername());
+		Set<String> currentUserNames = CurrentUsers.getCurrentUsernames();
+		Assert.assertTrue(currentUserNames.contains("Mukembo"));
+	}
+
+}

api/src/test/resources/org/openmrs/util/CurrentUserTest.xml

@@ -0,0 +1,16 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!--
+
+    This Source Code Form is subject to the terms of the Mozilla Public License,
+    v. 2.0. If a copy of the MPL was not distributed with this file, You can
+    obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
+    the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
+
+    Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
+    graphic logo is a trademark of OpenMRS Inc.
+
+-->
+<dataset>
+  <person person_id="5508" gender="F" dead="false" creator="1" date_created="2008-08-15 15:46:47.0" voided="false" uuid="edc3d446-e53b-11de-8404-001e378eb67e"/>
+  <users user_id="5508" person_id="5508" system_id="508-x" username="Mukembo" password="07082424c46568fa5442a3ddd9521ff8bf0715a6c4d411b2f79a37a2d45b5c14c97e2f3754f7367390bd68ec7aa22c5f1891dc413b3861063d5973fb4cd4bcda" salt="d485cc2ce9e8f15e4b15411363ee03471c72b2579dbf7d3684ed485ec94d8f480e281db0abc77d09bcd7fe96e6cc9a80423f69a8a594d5825cf02aedc4da787e" secret_question="" secret_answer="" creator="1" date_created="2008-08-15 15:57:09.0" changed_by="1" date_changed="2008-08-18 11:51:56.0" retired="false" retire_reason="" uuid="2eadf946-e53c-11de-8404-001e378eb67e"/> 
+</dataset>