Checking shutdown state also in blob finding.

Author: axl8713

geowebcache/azureblob/src/main/java/org/geowebcache/azure/AzureBlobStore.java

@@ -209,14 +209,18 @@ public boolean delete(TileRange tileRange) throws StorageException {
     /** Splits the deletion in parts to avoid memory accumulation. */
     private Stream<List<BlobItem>> findTileBlobsToDelete(TileRange tileRange, String coordsPrefix) {
 
-        Iterable<List<BlobItem>> iterable = () -> new Iterator<>() {
+        Iterable<List<BlobItem>> blobsIterable = () -> new Iterator<>() {
             private final int zoomStart = tileRange.getZoomStart();
             private final int zoomStop = tileRange.getZoomStop();
             private int currentZoom = zoomStart;
             private Iterator<BlobItem> currentBlobIterator = Collections.emptyIterator();
 
             @Override
             public boolean hasNext() {
+                if(shutDown) {
+                    return false;
+                }
+
                 while (!currentBlobIterator.hasNext() && currentZoom <= zoomStop) {
                     String zoomPrefix = coordsPrefix + "/" + currentZoom;
 
@@ -253,7 +257,7 @@ public List<BlobItem> next() {
             }
         };
 
-        return StreamSupport.stream(iterable.spliterator(), false);
+        return StreamSupport.stream(blobsIterable.spliterator(), false);
     }
 
     private boolean isTileBlobInBounds(BlobItem tileBlob, long[] bounds) {