@Override
		public void cancelled() {
			for (BlockStream blockStream : blockStreams) {
				try {
					blockStream.close();
				}
				catch (IOException e) {
					// ignore
				}
			}
		}
<code>BlockStreamCancelMonitor</code> is used to close associated BlockStreams
when a TaskMonitor is cancelled
Ghidra/Framework/DB/src/main/java/db/buffers/LocalBufferFile.java