Making the events queue abstract to future support other backends

src/main/java/org/opensearch/ubl/UserBehaviorLoggingPlugin.java

@@ -32,7 +32,7 @@
 import org.opensearch.ubl.action.UserBehaviorLoggingRestHandler;
 import org.opensearch.ubl.backends.Backend;
 import org.opensearch.ubl.backends.OpenSearchBackend;
-import org.opensearch.ubl.events.EventManager;
+import org.opensearch.ubl.events.OpenSearchEventManager;
 import org.opensearch.watcher.ResourceWatcherService;
 
 import java.util.ArrayList;
@@ -113,9 +113,10 @@ public Collection<Object> createComponents(
 
         LOGGER.info("Creating scheduled task");
 
-        // TODO: Only start this if already initialized.
+        // TODO: Only start this if an OpenSearch store is already initialized.
+        // Otherwise, start it when a store is initialized.
         threadPool.scheduler().scheduleAtFixedRate(() -> {
-            EventManager.getInstance(client).process();
+            OpenSearchEventManager.getInstance(client).process();
         }, 0, 2000, TimeUnit.MILLISECONDS);
 
         return Collections.emptyList();

src/main/java/org/opensearch/ubl/action/UserBehaviorLoggingRestHandler.java

@@ -72,8 +72,8 @@ protected RestChannelConsumer prepareRequest(RestRequest request, NodeClient nod
                 final String storeName = request.param("store");
 
                 LOGGER.info("Persisting event into {}", storeName);
-                final String event = request.content().utf8ToString();
-                backend.persistEvent(storeName, event);
+                final String eventJson = request.content().utf8ToString();
+                backend.persistEvent(storeName, eventJson);
 
                 return (channel) -> channel.sendResponse(new BytesRestResponse(RestStatus.OK, "Event received"));
 

src/main/java/org/opensearch/ubl/backends/Backend.java

@@ -20,7 +20,7 @@ public interface Backend {
 
     void delete(final String storeName, RestChannel channel);
 
-    void persistEvent(final String storeName, String event);
+    void persistEvent(final String storeName, String eventJson);
 
     void persistQuery(final String storeName, QueryRequest queryRequest, QueryResponse queryResponse) throws Exception;
 

src/main/java/org/opensearch/ubl/backends/OpenSearchBackend.java

@@ -21,7 +21,8 @@
 import org.opensearch.rest.RestChannel;
 import org.opensearch.rest.action.RestToXContentListener;
 import org.opensearch.ubl.SettingsConstants;
-import org.opensearch.ubl.events.EventManager;
+import org.opensearch.ubl.events.Event;
+import org.opensearch.ubl.events.OpenSearchEventManager;
 import org.opensearch.ubl.model.QueryRequest;
 import org.opensearch.ubl.model.QueryResponse;
 
@@ -90,16 +91,15 @@ public void delete(String storeName, RestChannel channel) {
     }
 
     @Override
-    public void persistEvent(String storeName, String event) {
+    public void persistEvent(String storeName, String eventJson) {
 
         // Add the event for indexing.
         LOGGER.info("Indexing event into {}", storeName);
         final String eventsIndexName = getEventsIndexName(storeName);
-        final IndexRequest indexRequest = new IndexRequest(eventsIndexName)
-                .source(event, XContentType.JSON);
 
         //return (channel) -> client.index(indexRequest, new RestToXContentListener<>(channel));
-        EventManager.getInstance(client).addIndexRequest(indexRequest);
+        final Event event = new Event(eventsIndexName, eventJson);
+        OpenSearchEventManager.getInstance(client).add(event);
 
     }
 
@@ -123,8 +123,8 @@ public void persistQuery(final String storeName, final QueryRequest queryRequest
         final IndexRequest indexRequest = new IndexRequest(queriesIndexName)
                 .source(source, XContentType.JSON);
 
-        //return (channel) -> client.index(indexRequest, new RestToXContentListener<>(channel));
-        EventManager.getInstance(client).addIndexRequest(indexRequest);
+        // TODO: Move this to the queue, too.
+        client.index(indexRequest);
 
     }
 
@@ -148,7 +148,7 @@ private String getResourceFile(final String fileName) {
             Streams.copy(is, out);
             return out.toString(StandardCharsets.UTF_8);
         } catch (IOException e) {
-            throw new IllegalStateException("failed to create index with resource [" + OpenSearchBackend.EVENTS_MAPPING_FILE + "]", e);
+            throw new IllegalStateException("Unable to create index with resource [" + OpenSearchBackend.EVENTS_MAPPING_FILE + "]", e);
         }
     }
 

src/main/java/org/opensearch/ubl/events/AbstractEventManager.java

@@ -0,0 +1,31 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.ubl.events;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.opensearch.action.index.IndexRequest;
+import org.opensearch.ubl.events.queues.EventQueue;
+import org.opensearch.ubl.events.queues.InternalQueue;
+
+public abstract class AbstractEventManager {
+
+    private final Logger LOGGER = LogManager.getLogger(AbstractEventManager.class);
+
+    protected final EventQueue eventQueue;
+
+    public AbstractEventManager() {
+        this.eventQueue = new InternalQueue();
+    }
+
+    public abstract void process();
+
+    public abstract void add(Event event);
+
+}

src/main/java/org/opensearch/ubl/events/Event.java

@@ -0,0 +1,29 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.ubl.events;
+
+public class Event {
+
+    private final String indexName;
+    private final String event;
+
+    public Event(String indexName, String event) {
+        this.indexName = indexName;
+        this.event = event;
+    }
+
+    public String getIndexName() {
+        return indexName;
+    }
+
+    public String getEvent() {
+        return event;
+    }
+
+}

src/main/java/org/opensearch/ubl/events/EventManager.java → src/main/java/org/opensearch/ubl/events/OpenSearchEventManager.java

@@ -13,31 +13,34 @@
 import org.opensearch.action.bulk.BulkRequest;
 import org.opensearch.action.index.IndexRequest;
 import org.opensearch.client.Client;
-import org.opensearch.ubl.events.queues.EventQueue;
-import org.opensearch.ubl.events.queues.InternalQueue;
+import org.opensearch.common.xcontent.XContentType;
 
-public class EventManager {
+public class OpenSearchEventManager extends AbstractEventManager {
 
-    private static final Logger LOGGER = LogManager.getLogger(EventManager.class);
+    private static final Logger LOGGER = LogManager.getLogger(OpenSearchEventManager.class);
 
-    private final EventQueue eventQueue;
     private final Client client;
-    private static EventManager eventManager;
+    private static OpenSearchEventManager openSearchEventManager;
 
-    private EventManager(Client client) {
+    private OpenSearchEventManager(Client client) {
         this.client = client;
-        this.eventQueue = new InternalQueue();
     }
 
+    @Override
     public void process() {
 
         if(eventQueue.size() > 0) {
 
             final BulkRequest bulkRequest = new BulkRequest();
             LOGGER.info("Bulk inserting " + eventQueue.size() + " search relevance events");
 
-            for (final IndexRequest indexRequest : eventQueue.get()) {
+            for (final Event event : eventQueue.get()) {
+
+                final IndexRequest indexRequest = new IndexRequest(event.getIndexName())
+                        .source(event.getEvent(), XContentType.JSON);
+
                 bulkRequest.add(indexRequest);
+
             }
 
             eventQueue.clear();
@@ -47,15 +50,16 @@ public void process() {
 
     }
 
-    public static EventManager getInstance(Client client) {
-        if(eventManager == null) {
-            eventManager = new EventManager(client);
-        }
-        return eventManager;
+    @Override
+    public void add(Event event) {
+        eventQueue.add(event);
     }
 
-    public void addIndexRequest(IndexRequest request) {
-        eventQueue.add(request);
+    public static OpenSearchEventManager getInstance(Client client) {
+        if(openSearchEventManager == null) {
+            openSearchEventManager = new OpenSearchEventManager(client);
+        }
+        return openSearchEventManager;
     }
 
 }

src/main/java/org/opensearch/ubl/events/queues/EventQueue.java

@@ -9,16 +9,17 @@
 package org.opensearch.ubl.events.queues;
 
 import org.opensearch.action.index.IndexRequest;
+import org.opensearch.ubl.events.Event;
 
 import java.util.List;
 
 public interface EventQueue {
 
-    void add(IndexRequest indexRequest);
+    void add(Event event);
 
     void clear();
 
-    List<IndexRequest> get();
+    List<Event> get();
 
     int size();
 

src/main/java/org/opensearch/ubl/events/queues/InternalQueue.java

@@ -8,18 +8,18 @@
 
 package org.opensearch.ubl.events.queues;
 
-import org.opensearch.action.index.IndexRequest;
+import org.opensearch.ubl.events.Event;
 
 import java.util.LinkedList;
 import java.util.List;
 
 public class InternalQueue implements EventQueue {
 
-    private static final List<IndexRequest> indexRequests = new LinkedList<>();
+    private static final List<Event> indexRequests = new LinkedList<>();
 
     @Override
-    public void add(IndexRequest indexRequest) {
-        indexRequests.add(indexRequest);
+    public void add(Event event) {
+        indexRequests.add(event);
     }
 
     @Override
@@ -28,7 +28,7 @@ public void clear() {
     }
 
     @Override
-    public List<IndexRequest> get() {
+    public List<Event> get() {
         return indexRequests;
     }