From 66b9878c0e44020499517b2dd71801fbca2c125f Mon Sep 17 00:00:00 2001
From: s00370346 <swarup.nayak1@huawei.com>
Date: Mon, 3 Jun 2019 12:02:02 +0530
Subject: Issue-ID: DCAEGEN2-1587 Restconf resubscribe if external ctlr
 restarts

Signed-off-by: s00370346 <swarup.nayak1@huawei.com>
Change-Id: Iaa5559d80ee07c019cb8ca23a73218d52952dc5c
---
 .../dcae/controller/PersistentEventConnection.java | 60 ++++++++++++++++------
 1 file changed, 44 insertions(+), 16 deletions(-)

diff --git a/src/main/java/org/onap/dcae/controller/PersistentEventConnection.java b/src/main/java/org/onap/dcae/controller/PersistentEventConnection.java
index 48d5448..14eb2e3 100644
--- a/src/main/java/org/onap/dcae/controller/PersistentEventConnection.java
+++ b/src/main/java/org/onap/dcae/controller/PersistentEventConnection.java
@@ -59,6 +59,7 @@ public class PersistentEventConnection implements Runnable {
     private String event_ruleId;
     private EventConnectionState state;
     private volatile boolean running = true;
+    private static boolean subscribe = true;
     private static final Logger log = LoggerFactory.getLogger(PersistentEventConnection.class);
     private boolean modifyEvent;
     private String modifyMethod;
@@ -173,13 +174,49 @@ public class PersistentEventConnection implements Runnable {
             this.eventParaMap = new HashMap<>();
             this.eventParaMap.putAll(builder.parentCtrllr.getParaMap());
             printEventParamMap();
-            log.info("New persistent connection created " + event_name + "modify event " + modifyEvent);
+            log.info("New persistent connection created " + event_name + " modify event " + modifyEvent);
 
     }
 
     @Override
     public void run() {
-        Parameters p = null;
+        int sleep_time = 5000;
+        boolean openState = false;
+        EventSource eventSrc = null;
+        while (running) {
+            try {
+                Thread.sleep(sleep_time);
+                if (subscribe) {
+                    subscribe = false;
+                    subscribe();
+                    eventSrc = OpenSseConnection();
+                    openState = eventSrc.isOpen();
+                    log.info("SSE state " + eventSrc.isOpen());
+                }
+                log.info("SSE state " + openState);
+                if (eventSrc != null && !openState)
+                {
+                    log.info("SSE state " + eventSrc.isOpen() + " Resubscribing after 1 minute...");
+                    Thread.sleep(sleep_time * 12);
+                    /* Resubscribe again */
+                    subscribe = true;
+                }
+            } catch (Exception e){
+                /* Other exception we can keep on retrying */
+                log.info("Connection failed: " + e.getMessage());
+                running = true;
+                subscribe = true;
+                if (eventSrc != null) {
+                    eventSrc.close();
+                    eventSrc = null;
+                }
+            }
+        }
+
+        log.info("Closed connection to SSE source");
+    }
+
+    private void subscribe() {
         try {
             modifyEventParamMap(Constants.KSETTING_REST_API_URL, getUriMethod(parentCtrllr.getProperties().authorizationEnabled())
                     + parentCtrllr.getCfgInfo().getController_restapiUrl()
@@ -209,6 +246,10 @@ public class PersistentEventConnection implements Runnable {
         }
 
         log.info("SSE received url " + event_sseventsUrl);
+    }
+    private EventSource OpenSseConnection() {
+        Parameters p = null;
+
         try {
             p = getParameters(eventParaMap);
         } catch (Exception e) {
@@ -232,21 +273,8 @@ public class PersistentEventConnection implements Runnable {
         eventSource.register(new DataChangeEventListener(this));
         eventSource.open();
         log.info("Connected to SSE source");
-
-        while (running) {
-            try {
-                log.info("SSE state " + eventSource.isOpen());
-                Thread.sleep(5000);
-            } catch (InterruptedException ie) {
-                log.info("Exception: " + ie.getMessage());
-                Thread.currentThread().interrupt();
-                running = false;
-            }
-        }
-        eventSource.close();
-        log.info("Closed connection to SSE source");
+        return eventSource;
     }
-
     private String getAuthorizationToken(String userName, String password) {
         return "Basic " + Base64.getEncoder().encodeToString((
                 userName + ":" + password).getBytes());
-- 
cgit 1.2.3-korg