final DataflowQueue stream4 = new DataflowQueue();
// processor1 waits for value in stream 1 and writes 2*value to stream2
final List<DataflowQueue> calculationInputList = asList(stream1);
final List<DataflowQueue> calculationOutputList = asList(stream2);
final DataflowProcessor processor1 = Dataflow.operator(calculationInputList, calculationOutputList, new DataflowMessagingRunnable(1) {
@Override
protected void doRun(final Object... arguments) {
// Passing calculated value to output stream
getOwningProcessor().bindOutput(2 * (Integer) arguments[0]);
}
});
assertFalse("Stream2 should not be bound as no value was passed to stream1", stream2.isBound());
// send values to streams
stream1.bind(1);
waitForValue(stream2);
assertTrue("Stream2 should be bound as value has been calculated by processor1", stream2.isBound());
// processor2 reads value from stream2 and stream 2 and writes sum to stream 4
final DataflowProcessor processor2 = Dataflow.operator(asList(stream2, stream3), asList(stream4), new DataflowMessagingRunnable(2) {
@Override
protected void doRun(final Object... arguments) {
getOwningProcessor().bindOutput((Integer) arguments[0] + (Integer) arguments[1]);
}
});
// Multiple values can be send to one stream
stream1.bind(2);
stream1.bind(3);
assertFalse("Stream3 should not be bound as no value was set and it is input for calculation, not output", stream3.isBound());
assertFalse("Stream4 should not be bound as no value was passed yet to its input streams", stream4.isBound());
// processor processor2 waits for stream3 values, lets send them
stream3.bind(100);
stream3.bind(100);
stream3.bind(100);
waitForValue(stream4);
assertTrue("Stream4 should be bound as values has been passed to its input streams", stream4.isBound());
//fetch values
assertEquals(102, stream4.getVal());
assertEquals(104, stream4.getVal());
assertEquals(106, stream4.getVal());
assertFalse("All values fetched, no output expected", stream4.isBound());
// would wait for another input and hang
// stream4.getVal();
processor1.terminate();
processor2.terminate();
}