Prepare codebase for dynamic DMaaP configuration

From now on, there is only one single place
where we can create whole app core concerning sending events
and it has a single entry point, based on DMaaP configuration.
It can be used to rebuild part of app that is responsible
for sending events dynamically.
Changes are in scope for the dynamic DMaaP config feature.
+ bumped up code coverage a bit

Change-Id: Iecc8c4e534ae9b781f47e3616409271ba83169c8
Signed-off-by: PawelSzalapski <pawel.szalapski@nokia.com>
Issue-ID: DCAEGEN2-517

1 files changed, 126 insertions, 0 deletions

diff --git a/src/test/java/org/onap/dcae/commonFunction/event/publishing/DMaaPPublishersCacheTest.java b/src/test/java/org/onap/dcae/commonFunction/event/publishing/DMaaPPublishersCacheTest.java
new file mode 100644
index 00000000..8dc69f62
--- /dev/null
+++ b/src/test/java/org/onap/dcae/commonFunction/event/publishing/DMaaPPublishersCacheTest.java
@@ -0,0 +1,126 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2018 Nokia. 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.dcae.commonFunction.event.publishing;
+
+import static io.vavr.API.List;
+import static io.vavr.API.Map;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+import static org.mockito.Mockito.when;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import io.vavr.collection.Map;
+import io.vavr.control.Option;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import org.junit.Before;
+import org.junit.Test;
+import org.onap.dcae.commonFunction.event.publishing.DMaaPPublishersCache.CambriaPublishersCacheLoader;
+import org.onap.dcae.commonFunction.event.publishing.DMaaPPublishersCache.OnPublisherRemovalListener;
+
+
+public class DMaaPPublishersCacheTest {
+
+    private String streamId1;
+    private Map<String, PublisherConfig> dMaaPConfigs;
+
+    @Before
+    public void setUp() {
+        streamId1 = "sampleStream1";
+        dMaaPConfigs = Map("sampleStream1", new PublisherConfig(List("destination1"), "topic1"));
+    }
+
+    @Test
+    public void shouldReturnTheSameCachedInstanceOnConsecutiveRetrievals() {
+        // given
+        DMaaPPublishersCache dMaaPPublishersCache = new DMaaPPublishersCache(dMaaPConfigs);
+
+        // when
+        Option<CambriaBatchingPublisher> firstPublisher = dMaaPPublishersCache.getPublisher(streamId1);
+        Option<CambriaBatchingPublisher> secondPublisher = dMaaPPublishersCache.getPublisher(streamId1);
+
+        // then
+        assertSame("should return same instance", firstPublisher.get(), secondPublisher.get());
+    }
+
+    @Test
+    public void shouldCloseCambriaPublisherOnCacheInvalidate() throws IOException, InterruptedException {
+        // given
+        CambriaBatchingPublisher cambriaPublisherMock1 = mock(CambriaBatchingPublisher.class);
+        CambriaPublishersCacheLoader cacheLoaderMock = mock(CambriaPublishersCacheLoader.class);
+        DMaaPPublishersCache dMaaPPublishersCache = new DMaaPPublishersCache(cacheLoaderMock,
+                                                                             new OnPublisherRemovalListener(),
+                                                                             dMaaPConfigs);
+        when(cacheLoaderMock.load(streamId1)).thenReturn(cambriaPublisherMock1);
+
+        // when
+        dMaaPPublishersCache.getPublisher(streamId1);
+        dMaaPPublishersCache.closePublisherFor(streamId1);
+
+        // then
+        verify(cambriaPublisherMock1).close(20, TimeUnit.SECONDS);
+
+    }
+
+    @Test
+    public void shouldReturnNoneIfThereIsNoDMaaPConfigurationForGivenStreamID() {
+        // given
+        DMaaPPublishersCache dMaaPPublishersCache = new DMaaPPublishersCache(dMaaPConfigs);
+
+        // then
+        assertTrue("should not exist", dMaaPPublishersCache.getPublisher("non-existing").isEmpty());
+    }
+
+
+    @Test
+    public void shouldCloseOnlyChangedPublishers() throws IOException, InterruptedException {
+        // given
+        CambriaBatchingPublisher cambriaPublisherMock1 = mock(CambriaBatchingPublisher.class);
+        CambriaBatchingPublisher cambriaPublisherMock2 = mock(CambriaBatchingPublisher.class);
+        CambriaPublishersCacheLoader cacheLoaderMock = mock(CambriaPublishersCacheLoader.class);
+        String firstDomain = "domain1";
+        String secondDomain = "domain2";
+        Map<String, PublisherConfig> oldConfig = Map(firstDomain,
+                                                     new PublisherConfig(List("destination1"), "topic1"),
+                                                     secondDomain,
+                                                     new PublisherConfig(List("destination2"), "topic2",
+                                                                         "user", "pass"));
+        Map<String, PublisherConfig> newConfig = Map(firstDomain, new PublisherConfig(List("destination1"), "topic1"),
+                                                     secondDomain, new PublisherConfig(List("destination2"), "topic2"));
+        DMaaPPublishersCache dMaaPPublishersCache = new DMaaPPublishersCache(cacheLoaderMock,
+                                                                             new OnPublisherRemovalListener(),
+                                                                             oldConfig);
+        when(cacheLoaderMock.load(firstDomain)).thenReturn(cambriaPublisherMock1);
+        when(cacheLoaderMock.load(secondDomain)).thenReturn(cambriaPublisherMock2);
+
+        dMaaPPublishersCache.getPublisher(firstDomain);
+        dMaaPPublishersCache.getPublisher(secondDomain);
+
+        // when
+        dMaaPPublishersCache.reconfigure(newConfig);
+
+        // then
+        verify(cambriaPublisherMock2).close(20, TimeUnit.SECONDS);
+        verifyZeroInteractions(cambriaPublisherMock1);
+    }
+}
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