/**
* @param nodeId Sender node ID.
* @param msg Prepare request.
*/
@SuppressWarnings({"InstanceofCatchParameter"})
private void processPrepareRequest(UUID nodeId, GridDistributedTxPrepareRequest<K, V> msg) {
assert nodeId != null;
assert msg != null;
GridReplicatedTxRemote<K, V> tx = null;
GridDistributedTxPrepareResponse<K, V> res;
try {
tx =
new GridReplicatedTxRemote<K, V>(
ctx.deploy().globalLoader(),
nodeId,
msg.threadId(),
msg.version(),
msg.commitVersion(),
msg.concurrency(),
msg.isolation(),
msg.isInvalidate(),
msg.timeout(),
msg.reads(),
msg.writes(),
ctx);
tx = ctx.tm().onCreated(tx);
if (tx == null || !ctx.tm().onStarted(tx))
throw new GridCacheTxRollbackException("Attempt to start a completed transaction: " + tx);
// Prepare prior to reordering, so the pending locks added
// in prepare phase will get properly ordered as well.
tx.prepare();
// Add remote candidates and reorder completed and uncompleted versions.
tx.addRemoteCandidates(
msg.candidatesByKey(), msg.committedVersions(), msg.rolledbackVersions());
if (msg.concurrency() == EVENTUALLY_CONSISTENT) {
if (log.isDebugEnabled()) log.debug("Committing transaction during remote prepare: " + tx);
tx.commit();
if (log.isDebugEnabled()) log.debug("Committed transaction during remote prepare: " + tx);
// Don't send response.
return;
}
res = new GridDistributedTxPrepareResponse<K, V>(msg.version());
Map<K, Collection<GridCacheMvccCandidate<K>>> cands = tx.localCandidates();
// Add local candidates (completed version must be set below).
res.candidates(cands);
} catch (GridException e) {
if (e instanceof GridCacheTxRollbackException) {
if (log.isDebugEnabled())
log.debug("Transaction was rolled back before prepare completed: " + tx);
} else if (e instanceof GridCacheTxOptimisticException) {
if (log.isDebugEnabled())
log.debug("Optimistic failure for remote transaction (will rollback): " + tx);
} else {
U.error(log, "Failed to process prepare request: " + msg, e);
}
if (tx != null)
// Automatically rollback remote transactions.
tx.rollback();
// Don't send response.
if (msg.concurrency() == EVENTUALLY_CONSISTENT) return;
res = new GridDistributedTxPrepareResponse<K, V>(msg.version());
res.error(e);
}
// Add completed versions.
res.completedVersions(
ctx.tm().committedVersions(msg.version()), ctx.tm().rolledbackVersions(msg.version()));
assert msg.concurrency() != EVENTUALLY_CONSISTENT;
GridNode node = ctx.discovery().node(nodeId);
if (node != null) {
try {
// Reply back to sender.
ctx.io().send(node, res);
} catch (GridException e) {
U.error(
log,
"Failed to send tx response to node (did the node leave grid?) [node="
+ node.id()
+ ", msg="
+ res
+ ']',
e);
if (tx != null) tx.rollback();
}
}
}
/**
* Processes lock request.
*
* @param nodeId Sender node ID.
* @param msg Lock request.
*/
@SuppressWarnings({"unchecked", "ThrowableInstanceNeverThrown"})
private void processLockRequest(UUID nodeId, GridDistributedLockRequest<K, V> msg) {
assert !nodeId.equals(locNodeId);
List<byte[]> keys = msg.keyBytes();
int cnt = keys.size();
GridReplicatedTxRemote<K, V> tx = null;
GridDistributedLockResponse res;
ClassLoader ldr = null;
try {
ldr = ctx.deploy().globalLoader();
if (ldr != null) {
res = new GridDistributedLockResponse(msg.version(), msg.futureId(), cnt);
for (int i = 0; i < keys.size(); i++) {
byte[] bytes = keys.get(i);
K key = msg.keys().get(i);
Collection<GridCacheMvccCandidate<K>> cands = msg.candidatesByIndex(i);
if (bytes == null) continue;
if (log.isDebugEnabled()) log.debug("Unmarshalled key: " + key);
GridDistributedCacheEntry<K, V> entry = null;
while (true) {
try {
entry = entryexx(key);
// Handle implicit locks for pessimistic transactions.
if (msg.inTx()) {
tx = ctx.tm().tx(msg.version());
if (tx != null) {
if (msg.txRead()) tx.addRead(key, bytes);
else tx.addWrite(key, bytes);
} else {
tx =
new GridReplicatedTxRemote<K, V>(
nodeId,
msg.threadId(),
msg.version(),
null,
PESSIMISTIC,
msg.isolation(),
msg.isInvalidate(),
msg.timeout(),
key,
bytes,
msg.txRead(),
ctx);
tx = ctx.tm().onCreated(tx);
if (tx == null || !ctx.tm().onStarted(tx))
throw new GridCacheTxRollbackException(
"Failed to acquire lock "
+ "(transaction has been completed): "
+ msg.version());
}
}
// Add remote candidate before reordering.
entry.addRemote(
msg.nodeId(),
null,
msg.threadId(),
msg.version(),
msg.timeout(),
tx != null && tx.ec(),
tx != null,
tx != null && tx.implicitSingle());
// Remote candidates for ordered lock queuing.
entry.addRemoteCandidates(
cands, msg.version(), msg.committedVersions(), msg.rolledbackVersions());
// Double-check in case if sender node left the grid.
if (ctx.discovery().node(msg.nodeId()) == null) {
if (log.isDebugEnabled())
log.debug(
"Node requesting lock left grid (lock request will be ignored): " + msg);
if (tx != null) tx.rollback();
return;
}
res.setCandidates(
i,
entry.localCandidates(),
ctx.tm().committedVersions(msg.version()),
ctx.tm().rolledbackVersions(msg.version()));
res.addValueBytes(
entry.rawGet(), msg.returnValue(i) ? entry.valueBytes(null) : null, ctx);
// Entry is legit.
break;
} catch (GridCacheEntryRemovedException ignored) {
assert entry.obsoleteVersion() != null
: "Obsolete flag not set on removed entry: " + entry;
if (log.isDebugEnabled())
log.debug(
"Received entry removed exception (will retry on renewed entry): " + entry);
if (tx != null) {
tx.clearEntry(entry.key());
if (log.isDebugEnabled())
log.debug(
"Cleared removed entry from remote transaction (will retry) [entry="
+ entry
+ ", tx="
+ tx
+ ']');
}
}
}
}
} else {
String err = "Failed to acquire deployment class for message: " + msg;
U.warn(log, err);
res =
new GridDistributedLockResponse(msg.version(), msg.futureId(), new GridException(err));
}
} catch (GridCacheTxRollbackException e) {
if (log.isDebugEnabled())
log.debug("Received lock request for completed transaction (will ignore): " + e);
res = new GridDistributedLockResponse(msg.version(), msg.futureId(), e);
} catch (GridException e) {
String err = "Failed to unmarshal at least one of the keys for lock request message: " + msg;
log.error(err, e);
res =
new GridDistributedLockResponse(msg.version(), msg.futureId(), new GridException(err, e));
if (tx != null) tx.rollback();
} catch (GridDistributedLockCancelledException ignored) {
// Received lock request for cancelled lock.
if (log.isDebugEnabled())
log.debug("Received lock request for canceled lock (will ignore): " + msg);
if (tx != null) tx.rollback();
// Don't send response back.
return;
}
GridNode node = ctx.discovery().node(msg.nodeId());
boolean releaseAll = false;
if (node != null) {
try {
// Reply back to sender.
ctx.io().send(node, res);
} catch (GridException e) {
U.error(log, "Failed to send message to node (did the node leave grid?): " + node.id(), e);
releaseAll = ldr != null;
}
}
// If sender left grid, release all locks acquired so far.
else releaseAll = ldr != null;
// Release all locks because sender node left grid.
if (releaseAll) {
for (K key : msg.keys()) {
while (true) {
GridDistributedCacheEntry<K, V> entry = peekexx(key);
try {
if (entry != null) entry.removeExplicitNodeLocks(msg.nodeId());
break;
} catch (GridCacheEntryRemovedException ignore) {
if (log.isDebugEnabled())
log.debug(
"Attempted to remove lock on removed entity during failure "
+ "of replicated lock request handling (will retry): "
+ entry);
}
}
}
U.warn(
log, "Sender node left grid in the midst of lock acquisition (locks will be released).");
}
}