public NotifyingNotifiableFuture<Object> flushCache(
Collection<Object> keys, Object retval, Address origin) {
if (trace) log.tracef("Invalidating L1 caches for keys %s", keys);
NotifyingNotifiableFuture<Object> future = new AggregatingNotifyingFutureImpl(retval, 2);
Collection<Address> invalidationAddresses = buildInvalidationAddressList(keys, origin);
int nodes = invalidationAddresses.size();
if (nodes > 0) {
// No need to invalidate at all if there is no one to invalidate!
boolean multicast = isUseMulticast(nodes);
if (trace)
log.tracef(
"There are %s nodes involved in invalidation. Threshold is: %s; using multicast: %s",
nodes, threshold, multicast);
if (multicast) {
if (trace) log.tracef("Invalidating keys %s via multicast", keys);
InvalidateCommand ic = commandsFactory.buildInvalidateFromL1Command(origin, false, keys);
rpcManager.broadcastRpcCommandInFuture(ic, future);
} else {
InvalidateCommand ic = commandsFactory.buildInvalidateFromL1Command(origin, false, keys);
// Ask the caches who have requested from us to remove
if (trace) log.tracef("Keys %s needs invalidation on %s", keys, invalidationAddresses);
rpcManager.invokeRemotelyInFuture(
invalidationAddresses, ic, true, future, rpcTimeout, true);
return future;
}
} else if (trace) log.trace("No L1 caches to invalidate");
return future;
}
@Override
public InvalidateCommand buildInvalidateFromL1Command(
Address origin, boolean forRehash, Set<Flag> flags, Collection<Object> keys) {
return actual.buildInvalidateFromL1Command(origin, forRehash, flags, keys);
}
private void invalidateSegments(Set<Integer> newSegments, Set<Integer> segmentsToL1) {
// The actual owners keep track of the nodes that hold a key in L1 ("requestors") and
// they invalidate the key on every requestor after a change.
// But this information is only present on the owners where the ClusteredGetKeyValueCommand
// got executed - if the requestor only contacted one owner, and that node is no longer an owner
// (perhaps because it left the cluster), the other owners will not know to invalidate the key
// on that requestor. Furthermore, the requestors list is not copied to the new owners during
// state transfers.
// To compensate for this, we delete all L1 entries in segments that changed ownership during
// this topology update. We can't actually differentiate between L1 entries and regular entries,
// so we delete all entries that don't belong to this node in the current OR previous topology.
Set<Object> keysToL1 = new HashSet<Object>();
Set<Object> keysToRemove = new HashSet<Object>();
// gather all keys from data container that belong to the segments that are being removed/moved
// to L1
for (InternalCacheEntry ice : dataContainer) {
Object key = ice.getKey();
int keySegment = getSegment(key);
if (segmentsToL1.contains(keySegment)) {
keysToL1.add(key);
} else if (!newSegments.contains(keySegment)) {
keysToRemove.add(key);
}
}
// gather all keys from cache store that belong to the segments that are being removed/moved to
// L1
CacheStore cacheStore = getCacheStore();
if (cacheStore != null) {
// todo [anistor] extend CacheStore interface to be able to specify a filter when loading keys
// (ie. keys should belong to desired segments)
try {
Set<Object> storedKeys =
cacheStore.loadAllKeys(new ReadOnlyDataContainerBackedKeySet(dataContainer));
for (Object key : storedKeys) {
int keySegment = getSegment(key);
if (segmentsToL1.contains(keySegment)) {
keysToL1.add(key);
} else if (!newSegments.contains(keySegment)) {
keysToRemove.add(key);
}
}
} catch (CacheLoaderException e) {
log.failedLoadingKeysFromCacheStore(e);
}
}
if (configuration.clustering().l1().onRehash()) {
log.debugf("Moving to L1 state for segments %s of cache %s", segmentsToL1, cacheName);
} else {
log.debugf("Removing state for segments %s of cache %s", segmentsToL1, cacheName);
}
if (!keysToL1.isEmpty()) {
try {
InvalidateCommand invalidateCmd =
commandsFactory.buildInvalidateFromL1Command(
true, EnumSet.of(CACHE_MODE_LOCAL, SKIP_LOCKING), keysToL1);
InvocationContext ctx = icc.createNonTxInvocationContext();
interceptorChain.invoke(ctx, invalidateCmd);
log.debugf(
"Invalidated %d keys, data container now has %d keys",
keysToL1.size(), dataContainer.size());
if (trace) log.tracef("Invalidated keys: %s", keysToL1);
} catch (CacheException e) {
log.failedToInvalidateKeys(e);
}
}
log.debugf(
"Removing L1 state for segments not in %s or %s for cache %s",
newSegments, segmentsToL1, cacheName);
if (!keysToRemove.isEmpty()) {
try {
InvalidateCommand invalidateCmd =
commandsFactory.buildInvalidateFromL1Command(
false, EnumSet.of(CACHE_MODE_LOCAL, SKIP_LOCKING), keysToRemove);
InvocationContext ctx = icc.createNonTxInvocationContext();
interceptorChain.invoke(ctx, invalidateCmd);
log.debugf(
"Invalidated %d keys, data container of cache %s now has %d keys",
keysToRemove.size(), cacheName, dataContainer.size());
if (trace) log.tracef("Invalidated keys: %s", keysToRemove);
} catch (CacheException e) {
log.failedToInvalidateKeys(e);
}
}
// todo [anistor] call CacheNotifier.notifyDataRehashed
}
@Override
public InvalidateCommand buildInvalidateFromL1Command(
boolean forRehash, Set<Flag> flags, Object... keys) {
return actual.buildInvalidateFromL1Command(forRehash, flags, keys);
}