@Test
public void testSanity() throws Exception {
// when we construct AggregateResourceMonitor with no arguments, it uses some default monitors.
AggregateResourceMonitor monitor = new AggregateResourceMonitor();
// we should currently have 2 fields by default.
Map<String, Double> map = monitor.getLoad();
assertTrue(map.containsKey(ResourceMonitor.HEAP_MEM));
assertTrue(map.containsKey(ResourceMonitor.LOAD_AVERAGE));
}
@Test
public void testOverlappingMonitors() throws Exception {
ResourceMonitor mon1 =
new ResourceMonitor() {
@Override
public Map<String, Double> getLoad() {
return Collections.singletonMap("FOO", 0.1);
}
};
ResourceMonitor mon2 =
new ResourceMonitor() {
@Override
public Map<String, Double> getLoad() {
return Collections.singletonMap("FOO", 0.99);
}
};
AggregateResourceMonitor monitor = new AggregateResourceMonitor(mon1, mon2);
Map<String, Double> map = monitor.getLoad();
assertEquals(0.99, map.get("FOO"), DELTA); // last one wins, currently.
}
@Test
public void testMultipleMonitors() throws Exception {
ResourceMonitor mon1 =
new ResourceMonitor() {
@Override
public Map<String, Double> getLoad() {
return Collections.singletonMap("FOO", 0.1);
}
};
ResourceMonitor mon2 =
new ResourceMonitor() {
@Override
public Map<String, Double> getLoad() {
return Collections.singletonMap("BAR", 0.99);
}
};
AggregateResourceMonitor monitor = new AggregateResourceMonitor(mon1, mon2);
Map<String, Double> map = monitor.getLoad();
assertEquals(0.1, map.get("FOO"), DELTA);
assertEquals(0.99, map.get("BAR"), DELTA);
assertEquals(2, map.size());
}
