/**
* Change topology.
*
* @param parent Grid to execute tasks on.
* @param add New nodes count.
* @param rmv Remove nodes count.
* @param type Type of nodes to manipulate.
*/
private static void changeTopology(Ignite parent, int add, int rmv, String type) {
Collection<ComputeTaskFuture<?>> tasks = new ArrayList<>();
IgniteCompute comp = parent.compute().withAsync();
// Start nodes in parallel.
while (add-- > 0) {
comp.execute(ClientStartNodeTask.class, type);
tasks.add(comp.future());
}
for (ComputeTaskFuture<?> task : tasks) task.get();
// Stop nodes in sequence.
while (rmv-- > 0) parent.compute().execute(ClientStopNodeTask.class, type);
// Wait for node stops.
// U.sleep(1000);
Collection<String> gridNames = new ArrayList<>();
for (Ignite g : G.allGrids()) gridNames.add(g.name());
parent.log().info(">>> Available grids: " + gridNames);
}
/** {@inheritDoc} */
@Override
public Collection<? extends ComputeJob> split(int gridSize, Serializable arg) {
if (log.isInfoEnabled())
log.info("Splitting task [task=" + this + ", gridSize=" + gridSize + ", arg=" + arg + ']');
Collection<GridCancelTestJob> jobs = new ArrayList<>(SPLIT_COUNT);
for (int i = 0; i < SPLIT_COUNT; i++) jobs.add(new GridCancelTestJob());
return jobs;
}
/**
* Gets random value from given collection.
*
* @param c Input collection (no {@code null} and not emtpy).
* @return Random value from the input collection.
*/
@SuppressWarnings("UnusedDeclaration")
private static <T> T rand(Collection<? extends T> c) {
if (c == null) throw new IllegalArgumentException();
int n = ThreadLocalRandom.current().nextInt(c.size());
int i = 0;
for (T t : c) {
if (i++ == n) return t;
}
throw new ConcurrentModificationException();
}
