1 files changed, 90 insertions, 0 deletions
diff --git a/src/test/java/org/onap/aai/spike/event/OffsetManagerTest.java b/src/test/java/org/onap/aai/spike/event/OffsetManagerTest.java
new file mode 100644
index 0000000..7975d6f
--- /dev/null
+++ b/src/test/java/org/onap/aai/spike/event/OffsetManagerTest.java
@@ -0,0 +1,90 @@
+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017-2018 Amdocs
+ * ================================================================================
+ * 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.spike.event;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+import org.onap.aai.spike.event.incoming.OffsetManager;
+
+public class OffsetManagerTest {
+
+    /**
+     * This test validates that as events are cached, and flagged as published, that the 'safe' offset
+     * is advanced correctly.
+     */
+    @Test
+    public void testOffsetAdvancement() throws Exception {
+
+        final Long offsetPeriod = 50L; // ms
+
+        // Create an instance of the offset manager.
+        OffsetManager offsetManager = new OffsetManager(10, offsetPeriod);
+
+        // Now, cache some events as if we had consumed them and they
+        // are in flight.
+        final int event1Index = offsetManager.cacheEvent("1", 1);
+        final int event2Index = offsetManager.cacheEvent("2", 2);
+        final int event3Index = offsetManager.cacheEvent("3", 3);
+        final int event4Index = offsetManager.cacheEvent("4", 4);
+
+        // Mark some of them as 'published'
+        offsetManager.markAsPublished(event1Index);
+        offsetManager.markAsPublished(event2Index);
+        offsetManager.markAsPublished(event4Index);
+
+        // Validate that the offset manager reported the expected offset (ie: we can only commit up
+        // to event2, event though event4 has been processed, since event3 is still in flight).
+        Long nextOffset = waitForOffsetUpdate(null, offsetPeriod, offsetManager);
+        assertTrue("Unexpected 'next offset' value.  Expected=2, actual=" + nextOffset, nextOffset == 2);
+
+        // Now, let's mark event3 as 'published'. We should see the next safe offset
+        // advance to event4 (since is was previously flagged as 'published').
+        offsetManager.markAsPublished(event3Index);
+
+        nextOffset = waitForOffsetUpdate(nextOffset, offsetPeriod, offsetManager);
+        assertTrue("Unexpected 'next offset' value.  Expected=4, actual=" + nextOffset, nextOffset == 4);
+    }
+
+    private Long waitForOffsetUpdate(Long currentOffset, Long offsetPeriod, OffsetManager offsetManager)
+            throws InterruptedException {
+
+        Long newOffset = currentOffset;
+        int retries = 3;
+        while (currentOffset == newOffset) {
+
+            // Wait long enough for the offset manager to have hopefully kicked it's offset
+            // update task.
+            Thread.sleep(offsetPeriod);
+            newOffset = offsetManager.getNextOffsetToCommit();
+
+            // We might have just missed the update due to timing, so we will retry a
+            // few times before giving up...
+            retries--;
+            if (retries == 0) {
+                fail("Safe offset was not updated as expected");
+            }
+        }
+        return newOffset;
+    }
+
+}