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, 99 insertions, 0 deletions

diff --git a/src/main/java/org/onap/dcae/commonFunction/event/publishing/DMaaPEventPublisher.java b/src/main/java/org/onap/dcae/commonFunction/event/publishing/DMaaPEventPublisher.java
new file mode 100644
index 00000000..fd9b3ae1
--- /dev/null
+++ b/src/main/java/org/onap/dcae/commonFunction/event/publishing/DMaaPEventPublisher.java
@@ -0,0 +1,99 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * org.onap.dcaegen2.collectors.ves
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * 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 org.onap.dcae.commonFunction.event.publishing.VavrUtils.f;
+
+import com.att.nsa.cambria.client.CambriaBatchingPublisher;
+import com.att.nsa.clock.SaClock;
+import com.att.nsa.logging.LoggingContext;
+import com.att.nsa.logging.log4j.EcompFields;
+import io.vavr.collection.Map;
+import io.vavr.control.Try;
+import java.io.IOException;
+import org.json.JSONObject;
+import org.onap.dcae.commonFunction.VESLogger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * @author Pawel Szalapski (pawel.szalapski@nokia.com)
+ */
+class DMaaPEventPublisher implements EventPublisher {
+    private static final int PENDING_MESSAGE_LOG_THRESHOLD = 100;
+    private static final String VES_UNIQUE_ID = "VESuniqueId";
+    private static final Logger log = LoggerFactory.getLogger(DMaaPEventPublisher.class);
+    private final DMaaPPublishersCache publishersCache;
+    private final Logger outputLogger;
+
+    DMaaPEventPublisher(DMaaPPublishersCache DMaaPPublishersCache,
+                        Logger outputLogger) {
+        this.publishersCache = DMaaPPublishersCache;
+        this.outputLogger = outputLogger;
+    }
+
+    @Override
+    public void sendEvent(JSONObject event, String domain) {
+        clearVesUniqueIdFromEvent(event);
+        publishersCache.getPublisher(domain)
+            .onEmpty(() ->
+                log.warn(f("Could not find event publisher for domain: '%s', dropping message: '%s'", domain, event)))
+            .forEach(publisher -> sendEvent(event, domain, publisher));
+    }
+
+    @Override
+    public void reconfigure(Map<String, PublisherConfig> dMaaPConfig) {
+        publishersCache.reconfigure(dMaaPConfig);
+    }
+
+    private void sendEvent(JSONObject event, String domain, CambriaBatchingPublisher publisher) {
+        Try.run(() -> uncheckedSendEvent(event, domain, publisher))
+            .onFailure(exc -> closePublisher(event, domain, exc));
+    }
+
+    private void uncheckedSendEvent(JSONObject event, String domain, CambriaBatchingPublisher publisher)
+        throws IOException {
+        int pendingMsgs = publisher.send("MyPartitionKey", event.toString());
+        if (pendingMsgs > PENDING_MESSAGE_LOG_THRESHOLD) {
+            log.info("Pending messages count: " + pendingMsgs);
+        }
+        String infoMsg = f("Event: '%s' scheduled to be send asynchronously on domain: '%s'", event, domain);
+        log.info(infoMsg);
+        outputLogger.info(infoMsg);
+    }
+
+    private void closePublisher(JSONObject event, String domain, Throwable e) {
+        log.error(f("Unable to schedule event: '%s' on domain: '%s'. Closing publisher and dropping message.",
+            event, domain), e);
+        publishersCache.closePublisherFor(domain);
+    }
+
+    private void clearVesUniqueIdFromEvent(JSONObject event) {
+        if (event.has(VES_UNIQUE_ID)) {
+            String uuid = event.get(VES_UNIQUE_ID).toString();
+            LoggingContext localLC = VESLogger.getLoggingContextForThread(uuid);
+            localLC.put(EcompFields.kBeginTimestampMs, SaClock.now());
+            log.debug("Removing VESuniqueid object from event");
+            event.remove(VES_UNIQUE_ID);
+        }
+    }
+}