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+/*-
+ * ============LICENSE_START=======================================================
+ * Common Logging Library
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights
+ * reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.aai.cl.eelf;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+import org.onap.aai.cl.api.Logger;
+import org.onap.aai.cl.eelf.LoggerFactory;
+
+/** This suite of tests is intended to exercise the basic functionality of the
+ * {@link LoggerFactory}. */
+public class LoggerFactoryTest {
+
+ /** This test validates that the {@link LoggerFactory} is a singleton. */
+ @Test
+ public void loggerFactorySingletonTest() {
+
+ // Call getInstance() on the LoggerFactory twice.
+ LoggerFactory loggerFactory1 = LoggerFactory.getInstance();
+ LoggerFactory loggerFactory2 = LoggerFactory.getInstance();
+
+ // Validate that what we got was two references to the same instance
+ // of the LoggerFactory (ie: yes, it really is a singleton).
+ assertTrue("Expected references to the SAME LoggerFactory instance",
+ loggerFactory1 == loggerFactory2);
+ }
+
+ /** This test validates that we can request {@link Logger} instances from the
+ * {@link LoggerFactory} by specifying either a name to use as the logger's
+ * identifier, or a class. */
+ @Test
+ public void getLoggerTest() {
+
+ // Get an instance of the LoggerFactory.
+ LoggerFactory loggerFactory = LoggerFactory.getInstance();
+
+ // Request a Logger instance by specifying the name we want for
+ // the logger.
+ Logger myLoggerByName = loggerFactory.getLogger("UnitTestLogger");
+
+ // Validate that we got a logger back.
+ assertNotNull(myLoggerByName);
+
+ // Now, request a Logger instance by specifying a class as our logger
+ // identifier.
+ Logger myLoggerByClass = loggerFactory.getLogger(LoggerFactoryTest.class);
+
+ // Validate that we got a logger back.
+ assertNotNull(myLoggerByClass);
+ }
+
+ /** This test validates that the {@link LoggerFactory} will only produce a
+ * single unique {@link Logger} instance for each requested log name.
+ * <p>
+ * In other words, two requests for a {@link Logger} with the same name will
+ * produce two references to the same instance, not two unique {@link Logger}
+ * instances. */
+ @Test
+ public void getLoggerSingleInstanceForNameTest() {
+
+ // Get an instance of the LoggerFactory.
+ LoggerFactory loggerFactory = LoggerFactory.getInstance();
+
+ // Request a Logger instance by specifying the name we want for
+ // the logger.
+ Logger myFirstLogger = loggerFactory.getLogger("UnitTestLogger");
+
+ // Request another Logger instance, but specify the same name for
+ // the logger's identifier.
+ Logger mySecondLogger = loggerFactory.getLogger("UnitTestLogger");
+
+ // Validate, that because there was already a Logger instance with the
+ // specified name, we just get back a reference to that instance.
+ assertTrue("Expected references to the same logger instance", myFirstLogger == mySecondLogger);
+
+ // Now, make a third logger request, but specify a different name.
+ Logger myThirdLogger = loggerFactory.getLogger("AnotherUnitTestLogger");
+
+ // Validate that, in this case, we really do get a new instance.
+ assertFalse("Expected a unique logger instance", myFirstLogger == myThirdLogger);
+ assertFalse("Expected a unique logger instance", mySecondLogger == myThirdLogger);
+ }
+
+ /** This test validates that the {@link LoggerFactory} will only produce a
+ * single unique {@link Logger} instance for each requested class.
+ * <p>
+ * In other words, two requests for a {@link Logger} with the same class will
+ * produce two references to the same instance, not two unique {@link Logger}
+ * instances. */
+ @Test
+ public void getLoggerSingleInstanceForClassTest() {
+
+ // Get an instance of the LoggerFactory.
+ LoggerFactory loggerFactory = LoggerFactory.getInstance();
+
+ // Request a Logger instance by specifying the class to use as the
+ // logger's identifier.
+ Logger myFirstLogger = loggerFactory.getLogger(LoggerFactoryTest.class);
+
+ // Request another Logger instance, but specify the same class for
+ // the logger's identifier.
+ Logger mySecondLogger = loggerFactory.getLogger(LoggerFactoryTest.class);
+
+ // Validate, that because there was already a Logger instance with the
+ // specified class, we just get back a reference to that instance.
+ assertTrue("Expected references to the same logger instance", myFirstLogger == mySecondLogger);
+
+ // Now, make a third logger request, but specify a different class.
+ Logger myThirdLogger = loggerFactory.getLogger(LoggerFactory.class);
+
+ // Validate that, in this case, we really do get a new instance.
+ assertFalse("Expected a unique logger instance", myFirstLogger == myThirdLogger);
+ assertFalse("Expected a unique logger instance", mySecondLogger == myThirdLogger);
+ }
+}