public void testFlowControlProperties() throws Exception {
assertTrue(_queueMBean.getCapacity() == 0);
assertTrue(_queueMBean.getFlowResumeCapacity() == 0);
assertFalse(_queueMBean.isFlowOverfull());
// capacity currently 0, try setting FlowResumeCapacity above this
try {
_queueMBean.setFlowResumeCapacity(1L);
fail("Should have failed to allow setting FlowResumeCapacity above Capacity");
} catch (IllegalArgumentException ex) {
// expected exception
assertTrue(_queueMBean.getFlowResumeCapacity() == 0);
}
// add a message to the queue
sendMessages(1, true);
// (FlowResume)Capacity currently 0, set both to 2
_queueMBean.setCapacity(2L);
assertTrue(_queueMBean.getCapacity() == 2L);
_queueMBean.setFlowResumeCapacity(2L);
assertTrue(_queueMBean.getFlowResumeCapacity() == 2L);
// Try setting Capacity below FlowResumeCapacity
try {
_queueMBean.setCapacity(1L);
fail("Should have failed to allow setting Capacity below FlowResumeCapacity");
} catch (IllegalArgumentException ex) {
// expected exception
assertTrue(_queueMBean.getCapacity() == 2);
}
// create a channel and use it to exercise the capacity check mechanism
AMQChannel channel = new AMQChannel(getSession(), 1, getMessageStore());
getQueue().checkCapacity(channel);
assertTrue(_queueMBean.isFlowOverfull());
assertTrue(channel.getBlocking());
// set FlowResumeCapacity to MESSAGE_SIZE and check queue is now underfull and channel unblocked
_queueMBean.setCapacity(MESSAGE_SIZE); // must increase capacity too
_queueMBean.setFlowResumeCapacity(MESSAGE_SIZE);
assertFalse(_queueMBean.isFlowOverfull());
assertFalse(channel.getBlocking());
}
