// create agentDFOChain sink
File tmpDir = FileUtil.mktempdir();
String spec = "agentDFOChain(\"localhost:1236\", \"localhost:1237\")";
CompositeSink snk = new CompositeSink(new LogicalNodeContext(
tmpDir.getName(), tmpDir.getName()), spec);
snk.open();
Event e1 = new EventImpl("test 1".getBytes());
Event e2 = new EventImpl("test 2".getBytes());
Event e3 = new EventImpl("test 3".getBytes());
Event e4 = new EventImpl("test 4".getBytes());