Esper EPL window select not working for a basic example - complex-event-processing

Question

Everything I read says this should work: I need my listener to trigger every 10 seconds with events. What I am getting now is every event in, it a listener trigger. What am I missing? The basic requirements are to create summarized statistics every 10s. Ideally I just want to pump data into the runtime. So, in this example, I would expect a dump of 10 records, once every 10 seconds
class StreamTest {
private final Configuration configuration = new Configuration();
private final EPRuntime runtime;
private final CompilerArguments args = new CompilerArguments();
private final EPCompiler compiler;
public DatadogApplicationTests() {
configuration.getCommon().addEventType(CommonLogEntry.class);
runtime = EPRuntimeProvider.getRuntime(this.getClass().getSimpleName(), configuration);
args.getPath().add(runtime.getRuntimePath());
compiler = EPCompilerProvider.getCompiler();
}
#Test
void testDisplayStatsEvery10S() throws Exception{
// Display stats every 10s about the traffic during those 10s:
EPCompiled compiled = compiler.compile("select * from CommonLogEntry.win:time(10)", args);
runtime.getDeploymentService().deploy(compiled).getStatements()[0].addListener(
(old, newEvents, epStatement, epRuntime) ->
Arrays.stream(old).forEach(e -> System.out.format("%s: received %n", LocalTime.now()))
);
new BufferedReader(new InputStreamReader(this.getClass().getResourceAsStream("/access.log"))).lines().map(CommonLogEntry::new).forEachOrdered(e -> {
runtime.getEventService().sendEventBean(e, e.getClass().getSimpleName());
try {
Thread.sleep(TimeUnit.SECONDS.toMillis(1));
} catch (InterruptedException ex) {
System.err.println(ex);
}
});
}
}
Which currently outputs every second, corresponding to the sleep in my stream:
11:00:54.676: received
11:00:55.684: received
11:00:56.689: received
11:00:57.694: received
11:00:58.698: received
11:00:59.700: received

Answer 1

A time window is a sliding window. There is a chapter on basic concepts that explains how they work. Here is the link to the basic concepts chapter.
It is not clear what the requirements are but I think what you want to achieve is collecting events for a while and then releasing them. You can draw inspiration from the solution patterns.
This will collect events for 10 seconds.
create schema StockTick(symbol string, price double);
create context CtxBatch start #now end after 10 seconds;
context CtxBatch select * from StockTick#keepall output snapshot when terminated;