Github user rakeshadr commented on a diff in the pull request: https://github.com/apache/zookeeper/pull/156#discussion_r97716640 --- Diff: src/java/test/org/apache/zookeeper/server/NIOServerCnxnTest.java --- @@ -68,4 +74,38 @@ public void testOperationsAfterCnxnClose() throws IOException, zk.close(); } } + + /** + * Mock extension of NIOServerCnxn to test for + * CancelledKeyException (ZOOKEEPER-2044). + */ + class MockNIOServerCnxn extends NIOServerCnxn { + public MockNIOServerCnxn( NIOServerCnxn cnxn ) + throws IOException { + super( cnxn.zkServer, cnxn.sock, cnxn.sk, cnxn.factory ); + } + + public void mockSendBuffer(ByteBuffer bb) throws Exception { + super.internalSendBuffer( bb ); + } + } + + @Test(timeout = 30000) + public void testValidSelectionKey() throws Exception { + final ZooKeeper zk = createClient(); + try { + Iterable<ServerCnxn> connections = serverFactory.getConnections(); + for (ServerCnxn serverCnxn : connections) { + MockNIOServerCnxn mock = new MockNIOServerCnxn((NIOServerCnxn) serverCnxn); + // Cancel key + ((NIOServerCnxn) serverCnxn).sock.keyFor(((NIOServerCnxnFactory) serverFactory).selector).cancel();; + mock.mockSendBuffer( ByteBuffer.allocate(8) ); + } + } catch (CancelledKeyException e) { + e.printStackTrace(); --- End diff -- Instead of printStackTrace, can we use LOG.error("Exception while sending bytes!", e);
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