@Override
protected void doStop() throws Exception {
LOG.info("Stopping flowlet: " + flowletContext);
try {
driver.stopAndWait();
} finally {
// Close all consumers
for (ConsumerSupplier consumerSupplier : consumerSuppliers) {
Closeables.closeQuietly(consumerSupplier);
}
flowletContext.close();
}
LOG.info("Flowlet stopped: " + flowletContext);
}
/** Constructs an instance. The instance must be constructed before the flowlet driver starts. */
FlowletProgramController(
String programName,
String flowletName,
BasicFlowletContext flowletContext,
FlowletRuntimeService driver,
Collection<ProducerSupplier> producerSuppliers,
Collection<ConsumerSupplier<?>> consumerSuppliers) {
super(programName + ":" + flowletName, flowletContext.getRunId());
this.flowletContext = flowletContext;
this.driver = driver;
this.producerSuppliers = producerSuppliers;
this.consumerSuppliers = consumerSuppliers;
listenDriveState(driver);
}
@Override
protected void doResume() throws Exception {
LOG.info("Resuming flowlet: " + flowletContext);
// Open producers
for (ProducerSupplier producerSupplier : producerSuppliers) {
producerSupplier.open();
}
// Open consumers
for (ConsumerSupplier consumerSupplier : consumerSuppliers) {
consumerSupplier.open(flowletContext.getInstanceCount());
}
driver.resume();
LOG.info("Flowlet resumed: " + flowletContext);
}
private void changeInstanceCount(BasicFlowletContext flowletContext, int instanceCount) {
Preconditions.checkState(
getState() == State.SUSPENDED,
"Cannot change instance count of a flowlet without suspension.");
flowletContext.setInstanceCount(instanceCount);
}