chore: Log interrupted exception, address comment todo.

Author: kinyoklion

lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/PollingBase.java

@@ -119,7 +119,8 @@ protected CompletableFuture<FDv2SourceResult> poll(Selector selector, boolean on
                             );
                             return FDv2SourceResult.changeSet(converted, fdv1Fallback);
                         } catch (Exception e) {
-                            // TODO: Do we need to be more specific about the exception type here?
+                            // Whatever exception happened here means we couldn't handle the data. So we are going to
+                            // treat that as invalid data.
                             DataSourceStatusProvider.ErrorInfo info = new DataSourceStatusProvider.ErrorInfo(
                                     DataSourceStatusProvider.ErrorKind.INVALID_DATA,
                                     0,

lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/PollingSynchronizerImpl.java

@@ -17,6 +17,8 @@ class PollingSynchronizerImpl extends PollingBase implements Synchronizer {
 
     private final IterableAsyncQueue<FDv2SourceResult> resultQueue = new IterableAsyncQueue<>();
 
+    private final LDLogger logger;
+
     public PollingSynchronizerImpl(
             FDv2Requestor requestor,
             LDLogger logger,
@@ -25,6 +27,7 @@ public PollingSynchronizerImpl(
             Duration pollInterval
     ) {
         super(requestor, logger.subLogger(Loggers.POLLING_SYNCHRONIZER));
+        this.logger = logger;
         this.selectorSource = selectorSource;
 
         synchronized (this) {
@@ -72,7 +75,9 @@ private void doPoll() {
                 resultQueue.put(res);
             }
         } catch (InterruptedException | ExecutionException e) {
-            // TODO: Determine if handling is needed.
+            // If this happens, then the thread running the poll has been interrupted, or the task has been canceled.
+            // This would likely be the result of a shutdown, so we are just logging this for debugging purposes.
+            logger.debug("Polling thread interrupted: {}", e.toString());
         }
     }