/** {@inheritDoc} */
@Override
public void execute(@Nullable GridProjection prj) throws GridException {
if (cb == null)
throw new IllegalStateException("Mandatory local callback is not set for the query: " + this);
if (prj == null) prj = ctx.grid();
prj = prj.forCache(ctx.name());
if (prj.nodes().isEmpty())
throw new GridTopologyException("Failed to execute query (projection is empty): " + this);
GridCacheMode mode = ctx.config().getCacheMode();
if (mode == LOCAL || mode == REPLICATED) {
Collection<GridNode> nodes = prj.nodes();
GridNode node = nodes.contains(ctx.localNode()) ? ctx.localNode() : F.rand(nodes);
assert node != null;
if (nodes.size() > 1 && !ctx.cache().isDrSystemCache()) {
if (node.id().equals(ctx.localNodeId()))
U.warn(
log,
"Continuous query for "
+ mode
+ " cache can be run only on local node. "
+ "Will execute query locally: "
+ this);
else
U.warn(
log,
"Continuous query for "
+ mode
+ " cache can be run only on single node. "
+ "Will execute query on remote node [qry="
+ this
+ ", node="
+ node
+ ']');
}
prj = prj.forNode(node);
}
closeLock.lock();
try {
if (routineId != null)
throw new IllegalStateException("Continuous query can't be executed twice.");
guard.block();
GridContinuousHandler hnd =
new GridCacheContinuousQueryHandler<>(ctx.name(), topic, cb, filter, prjPred);
routineId =
ctx.kernalContext()
.continuous()
.startRoutine(hnd, bufSize, timeInterval, autoUnsubscribe, prj.predicate())
.get();
} finally {
closeLock.unlock();
}
}
/**
* Runs basic cache example.
*
* @param args Command line arguments, none required.
* @throws Exception If example execution failed.
*/
public static void main(String[] args) throws Exception {
final Grid g =
args.length == 0 ? G.start("examples/config/spring-cache.xml") : G.start(args[0]);
try {
// Subscribe to events on every node, so we can visualize what's
// happening in remote caches.
g.run(
BROADCAST,
new CA() {
@Override
public void apply() {
GridLocalEventListener lsnr =
new GridLocalEventListener() {
@Override
public void onEvent(GridEvent event) {
switch (event.type()) {
case EVT_CACHE_OBJECT_PUT:
case EVT_CACHE_OBJECT_READ:
case EVT_CACHE_OBJECT_REMOVED:
{
GridCacheEvent e = (GridCacheEvent) event;
X.println("Cache event [name=" + e.name() + ", key=" + e.key() + ']');
}
}
}
};
GridNodeLocal<String, GridLocalEventListener> loc = g.nodeLocal();
GridLocalEventListener prev = loc.remove("lsnr");
// If there is a listener subscribed from previous runs, unsubscribe it.
if (prev != null) g.removeLocalEventListener(prev);
// Record new listener, so we can check it on next run.
loc.put("lsnr", lsnr);
// Subscribe listener.
g.addLocalEventListener(lsnr, EVTS_CACHE);
}
});
final GridCacheProjection<Integer, String> cache =
g.cache(CACHE_NAME).projection(Integer.class, String.class);
final int keyCnt = 20;
// Store keys in cache.
for (int i = 0; i < keyCnt; i++) cache.putx(i, Integer.toString(i));
// Peek and get on local node.
for (int i = 0; i < keyCnt; i++) {
X.println("Peeked [key=" + i + ", val=" + cache.peek(i) + ']');
X.println("Got [key=" + i + ", val=" + cache.get(i) + ']');
}
// Projection (view) for remote nodes.
GridProjection rmts = g.remoteProjection();
if (!rmts.isEmpty()) {
// Peek and get on remote nodes (comment it out if output gets too crowded).
g.remoteProjection()
.run(
BROADCAST,
new GridAbsClosureX() {
@Override
public void applyx() throws GridException {
for (int i = 0; i < keyCnt; i++) {
X.println("Peeked [key=" + i + ", val=" + cache.peek(i) + ']');
X.println("Got [key=" + i + ", val=" + cache.get(i) + ']');
}
}
});
}
} finally {
G.stop(true);
}
}