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authorJim Hahn <jrh3@att.com>2019-03-20 17:58:49 -0400
committerJim Hahn <jrh3@att.com>2019-03-21 10:12:53 -0400
commit4ac697769f46e3f6d52a086bcc8e15d89755dd0d (patch)
treea6a7028dd9d288730610afd1d556a646eff8afb4 /utils/src/test/java/org
parent6fb97d3373232c16823f374d637533d36ac1049c (diff)
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 <jrh3@att.com>
Diffstat (limited to 'utils/src/test/java/org')
-rw-r--r--utils/src/test/java/org/onap/policy/common/utils/services/RegistryTest.java139
1 files changed, 139 insertions, 0 deletions
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));
+ }
+
+}