From 4ac697769f46e3f6d52a086bcc8e15d89755dd0d Mon Sep 17 00:00:00 2001 From: Jim Hahn Date: Wed, 20 Mar 2019 17:58:49 -0400 Subject: Add simple Registry class to manage singletons Typically, singleton classes have lots of static methods, or use a getInstance() method to get the singleton. This provides an alternative mechanism, similar to the JDNI and the common-paramater property registry, where singletons can be registered. Clean up registry after junit test. Modified a few comments. (I prefer 90 characters for comments.) Added a method to register or replace an existing key without throwing an exception. Change-Id: I3b62719013d3b5f71adb5e9299d3c1257fb55c80 Issue-ID: POLICY-1542 Signed-off-by: Jim Hahn --- .../policy/common/utils/services/RegistryTest.java | 139 +++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 utils/src/test/java/org/onap/policy/common/utils/services/RegistryTest.java (limited to 'utils/src/test/java') diff --git a/utils/src/test/java/org/onap/policy/common/utils/services/RegistryTest.java b/utils/src/test/java/org/onap/policy/common/utils/services/RegistryTest.java new file mode 100644 index 00000000..f4b95089 --- /dev/null +++ b/utils/src/test/java/org/onap/policy/common/utils/services/RegistryTest.java @@ -0,0 +1,139 @@ +/* + * ============LICENSE_START======================================================= + * ONAP + * ================================================================================ + * Copyright (C) 2019 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.policy.common.utils.services; + +import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException; +import static org.assertj.core.api.Assertions.assertThatIllegalStateException; +import static org.assertj.core.api.Assertions.assertThatThrownBy; +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertFalse; +import static org.junit.Assert.assertSame; +import static org.junit.Assert.assertTrue; + +import org.junit.AfterClass; +import org.junit.Before; +import org.junit.Test; + +public class RegistryTest { + private static final String UNKNOWN = "unknown"; + private static final String NAME_STR = "name-string"; + private static final String NAME_OBJ = "name-object"; + private static final String NAME_INT = "name-integer"; + + private static final String DATA_STR = "data-1"; + private static final Object DATA_OBJ = new Object(); + private static final Integer DATA_INT = 5; + + /** + * Set up. + */ + @Before + public void setUp() { + Registry.newRegistry(); + + Registry.register(NAME_STR, DATA_STR); + Registry.register(NAME_OBJ, DATA_OBJ); + Registry.register(NAME_INT, DATA_INT); + } + + /** + * Ensure the registry is left empty when done. + */ + @AfterClass + public static void tearDownAfterClass() { + Registry.newRegistry(); + } + + /** + * Sunny day scenario is tested by other tests, so we focus on exceptions here. + */ + @Test + public void testRegister_Ex() { + assertThatIllegalStateException().isThrownBy(() -> Registry.register(NAME_STR, DATA_STR)); + + assertThatIllegalArgumentException().isThrownBy(() -> Registry.register(null, DATA_STR)); + assertThatIllegalArgumentException().isThrownBy(() -> Registry.register(UNKNOWN, null)); + } + + @Test + public void testRegisterOrReplace() { + // should be able to replace + Registry.registerOrReplace(NAME_STR, DATA_STR); + Registry.registerOrReplace(NAME_STR, DATA_STR); + assertSame(DATA_STR, Registry.get(NAME_STR, String.class)); + + // should also be able to add + Registry.registerOrReplace(UNKNOWN, DATA_INT); + assertSame(DATA_INT, Registry.get(UNKNOWN, Integer.class)); + + // check exception cases + assertThatIllegalArgumentException().isThrownBy(() -> Registry.registerOrReplace(null, DATA_STR)); + assertThatIllegalArgumentException().isThrownBy(() -> Registry.registerOrReplace(UNKNOWN, null)); + } + + @Test + public void testUnregister() { + assertTrue(Registry.unregister(NAME_STR)); + + assertEquals(null, Registry.getOrDefault(NAME_STR, String.class, null)); + + assertFalse(Registry.unregister(NAME_STR)); + } + + @Test + public void testGet() { + assertSame(DATA_STR, Registry.get(NAME_STR, String.class)); + assertSame(DATA_OBJ, Registry.get(NAME_OBJ, Object.class)); + assertSame(DATA_INT, Registry.get(NAME_INT, Integer.class)); + + // does not exist + assertThatIllegalArgumentException().isThrownBy(() -> Registry.get(UNKNOWN, Object.class)); + + // wrong type + assertThatThrownBy(() -> Registry.get(NAME_INT, String.class)).isInstanceOf(ClassCastException.class); + } + + @Test + public void testGetOrDefault() { + assertSame(DATA_STR, Registry.getOrDefault(NAME_STR, String.class, null)); + assertSame(DATA_OBJ, Registry.getOrDefault(NAME_OBJ, Object.class, "xyz")); + assertSame(DATA_INT, Registry.getOrDefault(NAME_INT, Integer.class, 10)); + + assertEquals(null, Registry.getOrDefault(UNKNOWN, String.class, null)); + assertEquals("abc", Registry.getOrDefault(UNKNOWN, String.class, "abc")); + assertEquals(Integer.valueOf(11), Registry.getOrDefault(UNKNOWN, Integer.class, 11)); + } + + @Test + public void testNewRegistry() { + assertSame(DATA_STR, Registry.get(NAME_STR, String.class)); + + Registry.newRegistry(); + + // should not exist + assertEquals(null, Registry.getOrDefault(NAME_STR, String.class, null)); + + // should be able to register it again now + Registry.register(NAME_STR, DATA_STR); + assertSame(DATA_STR, Registry.get(NAME_STR, String.class)); + } + +} -- cgit 1.2.3-korg