/** {@inheritDoc} */
@Override
public void addAttributeListener(GridTaskSessionAttributeListener lsnr, boolean rewind) {
A.notNull(lsnr, "lsnr");
Map<Object, Object> attrs = null;
List<GridTaskSessionAttributeListener> lsnrs;
synchronized (mux) {
lsnrs = new ArrayList<GridTaskSessionAttributeListener>(this.lsnrs.size());
lsnrs.addAll(this.lsnrs);
lsnrs.add(lsnr);
lsnrs = Collections.unmodifiableList(lsnrs);
this.lsnrs = lsnrs;
if (rewind) attrs = new HashMap<Object, Object>(this.attrs);
}
if (rewind) {
for (Map.Entry<Object, Object> entry : attrs.entrySet()) {
for (GridTaskSessionAttributeListener l : lsnrs) {
l.onAttributeSet(entry.getKey(), entry.getValue());
}
}
}
}
/** {@inheritDoc} */
@Override
public void explicitUndeploy(UUID nodeId, String rsrcName) {
Collection<SharedDeployment> undeployed = new LinkedList<SharedDeployment>();
synchronized (mux) {
for (Iterator<List<SharedDeployment>> i1 = cache.values().iterator(); i1.hasNext(); ) {
List<SharedDeployment> deps = i1.next();
for (Iterator<SharedDeployment> i2 = deps.iterator(); i2.hasNext(); ) {
SharedDeployment dep = i2.next();
if (dep.hasName(rsrcName)) {
if (!dep.isUndeployed()) {
dep.undeploy();
dep.onRemoved();
// Undeploy.
i2.remove();
undeployed.add(dep);
if (log.isInfoEnabled()) log.info("Undeployed per-version class loader: " + dep);
}
break;
}
}
if (deps.isEmpty()) i1.remove();
}
}
recordUndeployed(null, undeployed);
}
/** {@inheritDoc} */
@Override
public boolean removeAttributeListener(GridTaskSessionAttributeListener lsnr) {
A.notNull(lsnr, "lsnr");
synchronized (mux) {
List<GridTaskSessionAttributeListener> lsnrs =
new ArrayList<GridTaskSessionAttributeListener>(this.lsnrs);
boolean rmv = lsnrs.remove(lsnr);
this.lsnrs = Collections.unmodifiableList(lsnrs);
return rmv;
}
}
/**
* @param nodeId Primary node ID.
* @param req Request.
* @return Remote transaction.
* @throws GridException If failed.
* @throws GridDistributedLockCancelledException If lock has been cancelled.
*/
@SuppressWarnings({"RedundantTypeArguments"})
@Nullable
public GridNearTxRemote<K, V> startRemoteTx(UUID nodeId, GridDhtLockRequest<K, V> req)
throws GridException, GridDistributedLockCancelledException {
List<byte[]> nearKeyBytes = req.nearKeyBytes();
GridNearTxRemote<K, V> tx = null;
ClassLoader ldr = ctx.deploy().globalLoader();
if (ldr != null) {
for (int i = 0; i < nearKeyBytes.size(); i++) {
byte[] bytes = nearKeyBytes.get(i);
if (bytes == null) continue;
K key = req.nearKeys().get(i);
Collection<GridCacheMvccCandidate<K>> cands = req.candidatesByIndex(i);
if (log.isDebugEnabled()) log.debug("Unmarshalled key: " + key);
GridNearCacheEntry<K, V> entry = null;
while (true) {
try {
entry = peekExx(key);
if (entry != null) {
entry.keyBytes(bytes);
// Handle implicit locks for pessimistic transactions.
if (req.inTx()) {
tx = ctx.tm().tx(req.version());
if (tx != null) tx.addWrite(key, bytes, null /*Value.*/, null /*Value bytes.*/);
else {
tx =
new GridNearTxRemote<K, V>(
nodeId,
req.nearNodeId(),
req.threadId(),
req.version(),
null,
PESSIMISTIC,
req.isolation(),
req.isInvalidate(),
req.timeout(),
key,
bytes,
null, // Value.
null, // Value bytes.
ctx);
if (tx.empty()) return tx;
tx = ctx.tm().onCreated(tx);
if (tx == null || !ctx.tm().onStarted(tx))
throw new GridCacheTxRollbackException(
"Failed to acquire lock "
+ "(transaction has been completed): "
+ req.version());
}
}
// Add remote candidate before reordering.
entry.addRemote(
req.nodeId(),
nodeId,
req.threadId(),
req.version(),
req.timeout(),
tx != null && tx.ec(),
tx != null,
tx != null && tx.implicitSingle());
// Remote candidates for ordered lock queuing.
entry.addRemoteCandidates(
cands, req.version(), req.committedVersions(), req.rolledbackVersions());
entry.orderOwned(req.version(), req.owned(entry.key()));
}
// Double-check in case if sender node left the grid.
if (ctx.discovery().node(req.nodeId()) == null) {
if (log.isDebugEnabled())
log.debug("Node requesting lock left grid (lock request will be ignored): " + req);
if (tx != null) tx.rollback();
return null;
}
// 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 loader for message: " + req;
U.warn(log, err);
throw new GridException(err);
}
return tx;
}
/**
* 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).");
}
}
/** {@inheritDoc} */
@Override
public void onKernalStart() throws GridException {
discoLsnr =
new GridLocalEventListener() {
@Override
public void onEvent(GridEvent evt) {
assert evt instanceof GridDiscoveryEvent;
assert evt.type() == EVT_NODE_LEFT || evt.type() == EVT_NODE_FAILED;
GridDiscoveryEvent discoEvt = (GridDiscoveryEvent) evt;
Collection<SharedDeployment> undeployed = new LinkedList<SharedDeployment>();
if (log.isDebugEnabled()) log.debug("Processing node departure event: " + evt);
synchronized (mux) {
for (Iterator<List<SharedDeployment>> i1 = cache.values().iterator();
i1.hasNext(); ) {
List<SharedDeployment> deps = i1.next();
for (Iterator<SharedDeployment> i2 = deps.iterator(); i2.hasNext(); ) {
SharedDeployment dep = i2.next();
dep.removeParticipant(discoEvt.eventNodeId());
if (!dep.hasParticipants()) {
if (dep.deployMode() == SHARED) {
if (!dep.isUndeployed()) {
dep.undeploy();
// Undeploy.
i2.remove();
assert !dep.isRemoved();
dep.onRemoved();
undeployed.add(dep);
if (log.isDebugEnabled())
log.debug(
"Undeployed class loader as there are no participating "
+ "nodes: "
+ dep);
}
} else if (log.isDebugEnabled())
log.debug("Preserving deployment without node participants: " + dep);
} else if (log.isDebugEnabled())
log.debug("Keeping deployment as it still has participants: " + dep);
}
if (deps.isEmpty()) i1.remove();
}
}
recordUndeployed(discoEvt.eventNodeId(), undeployed);
}
};
ctx.event().addLocalEventListener(discoLsnr, EVT_NODE_FAILED, EVT_NODE_LEFT);
Collection<SharedDeployment> undeployed = new LinkedList<SharedDeployment>();
synchronized (mux) {
for (Iterator<List<SharedDeployment>> i1 = cache.values().iterator(); i1.hasNext(); ) {
List<SharedDeployment> deps = i1.next();
for (Iterator<SharedDeployment> i2 = deps.iterator(); i2.hasNext(); ) {
SharedDeployment dep = i2.next();
for (UUID nodeId : dep.getParticipantNodeIds())
if (ctx.discovery().node(nodeId) == null) dep.removeParticipant(nodeId);
if (!dep.hasParticipants()) {
if (dep.deployMode() == SHARED) {
if (!dep.isUndeployed()) {
dep.undeploy();
// Undeploy.
i2.remove();
dep.onRemoved();
undeployed.add(dep);
if (log.isDebugEnabled())
log.debug("Undeployed class loader as there are no participating nodes: " + dep);
}
} else if (log.isDebugEnabled())
log.debug("Preserving deployment without node participants: " + dep);
} else if (log.isDebugEnabled())
log.debug("Keeping deployment as it still has participants: " + dep);
}
if (deps.isEmpty()) i1.remove();
}
}
recordUndeployed(null, undeployed);
if (log.isDebugEnabled()) log.debug("Registered deployment discovery listener: " + discoLsnr);
}
/**
* Creates and caches new deployment.
*
* @param meta Deployment metadata.
* @param isCache Whether or not to cache.
* @return New deployment.
*/
private SharedDeployment createNewDeployment(GridDeploymentMetadata meta, boolean isCache) {
assert Thread.holdsLock(mux);
assert meta.parentLoader() == null;
GridUuid ldrId = GridUuid.randomUuid();
GridDeploymentClassLoader clsLdr;
if (meta.deploymentMode() == CONTINUOUS || meta.participants() == null) {
// Create peer class loader.
// Note that we are passing empty list for local P2P exclude, as it really
// does not make sense with shared deployment.
clsLdr =
new GridDeploymentClassLoader(
ldrId,
meta.userVersion(),
meta.deploymentMode(),
false,
ctx,
ctxLdr,
meta.classLoaderId(),
meta.senderNodeId(),
meta.sequenceNumber(),
comm,
ctx.config().getNetworkTimeout(),
log,
ctx.config().getPeerClassLoadingClassPathExclude(),
ctx.config().getPeerClassLoadingMissedResourcesCacheSize(),
meta.deploymentMode() == CONTINUOUS /* enable class byte cache in CONTINUOUS mode */);
if (meta.participants() != null)
for (Map.Entry<UUID, GridTuple2<GridUuid, Long>> e : meta.participants().entrySet())
clsLdr.register(e.getKey(), e.getValue().get1(), e.getValue().get2());
if (log.isDebugEnabled())
log.debug(
"Created class loader in CONTINUOUS mode or without participants "
+ "[ldr="
+ clsLdr
+ ", meta="
+ meta
+ ']');
} else {
assert meta.deploymentMode() == SHARED;
// Create peer class loader.
// Note that we are passing empty list for local P2P exclude, as it really
// does not make sense with shared deployment.
clsLdr =
new GridDeploymentClassLoader(
ldrId,
meta.userVersion(),
meta.deploymentMode(),
false,
ctx,
ctxLdr,
meta.participants(),
comm,
ctx.config().getNetworkTimeout(),
log,
ctx.config().getPeerClassLoadingClassPathExclude(),
ctx.config().getPeerClassLoadingMissedResourcesCacheSize(),
false);
if (log.isDebugEnabled())
log.debug(
"Created classloader in SHARED mode with participants "
+ "[ldr="
+ clsLdr
+ ", meta="
+ meta
+ ']');
}
// Give this deployment a unique class loader to emphasize that this
// ID is unique to this shared deployment and is not ID of loader on
// sender node.
SharedDeployment dep =
new SharedDeployment(
meta.deploymentMode(), clsLdr, ldrId, -1, meta.userVersion(), meta.alias());
if (log.isDebugEnabled()) log.debug("Created new deployment: " + dep);
if (isCache) {
List<SharedDeployment> deps =
F.addIfAbsent(cache, meta.userVersion(), new LinkedList<SharedDeployment>());
assert deps != null;
deps.add(dep);
if (log.isDebugEnabled()) log.debug("Added deployment to cache: " + cache);
}
return dep;
}
/**
* Removes obsolete deployments in case of redeploy.
*
* @param meta Request metadata.
* @return List of shares deployment.
*/
private GridTuple2<Boolean, SharedDeployment> checkRedeploy(GridDeploymentMetadata meta) {
assert Thread.holdsLock(mux);
SharedDeployment newDep = null;
for (List<SharedDeployment> deps : cache.values()) {
for (SharedDeployment dep : deps) {
if (!dep.isUndeployed() && !dep.isPendingUndeploy()) {
long undeployTimeout = ctx.config().getNetworkTimeout();
SharedDeployment doomed = null;
// Only check deployments with no participants.
if (!dep.hasParticipants()) {
// In case of SHARED deployment it is possible to get hear if
// unmarshalling happens during undeploy. In this case, we
// simply don't do anything.
if (dep.deployMode() == CONTINUOUS) {
if (dep.existingDeployedClass(meta.className()) != null) {
// Change from shared deploy to shared undeploy or user version change.
// Simply remove all deployments with no participating nodes.
if (meta.deploymentMode() == SHARED
|| !meta.userVersion().equals(dep.userVersion())) doomed = dep;
}
}
}
// If there are participants, we undeploy if class loader ID on some node changed.
else if (dep.existingDeployedClass(meta.className()) != null) {
GridTuple2<GridUuid, Long> ldr = dep.getClassLoaderId(meta.senderNodeId());
if (ldr != null) {
if (!ldr.get1().equals(meta.classLoaderId())) {
// If deployed sequence number is less, then schedule for undeployment.
if (ldr.get2() < meta.sequenceNumber()) {
if (log.isDebugEnabled())
log.debug(
"Received request for a class with newer sequence number "
+ "(will schedule current class for undeployment) [newSeq="
+ meta.sequenceNumber()
+ ", oldSeq="
+ ldr.get2()
+ ", senderNodeId="
+ meta.senderNodeId()
+ ", newClsLdrId="
+ meta.classLoaderId()
+ ", oldClsLdrId="
+ ldr.get1()
+ ']');
doomed = dep;
} else if (ldr.get2() > meta.sequenceNumber()) {
long time = System.currentTimeMillis() - dep.timestamp();
if (newDep == null && time < ctx.config().getNetworkTimeout()) {
// Set undeployTimeout, so the class will be scheduled
// for undeployment.
undeployTimeout = ctx.config().getNetworkTimeout() - time;
if (log.isDebugEnabled())
log.debug(
"Received execution request for a stale class (will deploy and "
+ "schedule undeployment in "
+ undeployTimeout
+ "ms) "
+ "[curSeq="
+ ldr.get2()
+ ", staleSeq="
+ meta.sequenceNumber()
+ ", cls="
+ meta.className()
+ ", senderNodeId="
+ meta.senderNodeId()
+ ", curLdrId="
+ ldr.get1()
+ ", staleLdrId="
+ meta.classLoaderId()
+ ']');
// We got the redeployed class before the old one.
// Simply create a temporary deployment for the sender node,
// and schedule undeploy for it.
newDep = createNewDeployment(meta, false);
doomed = newDep;
} else {
U.warn(
log,
"Received execution request for a class that has been redeployed "
+ "(will ignore): "
+ meta.alias());
if (log.isDebugEnabled())
log.debug(
"Received execution request for a class that has been redeployed "
+ "(will ignore) [alias="
+ meta.alias()
+ ", dep="
+ dep
+ ']');
return F.t(false, null);
}
} else {
U.error(
log,
"Sequence number does not correspond to class loader ID [seqNum="
+ meta.sequenceNumber()
+ ", dep="
+ dep
+ ']');
return F.t(false, null);
}
}
}
}
if (doomed != null) {
doomed.onUndeployScheduled();
if (log.isDebugEnabled()) log.debug("Deployment was scheduled for undeploy: " + doomed);
// Lifespan time.
final long endTime = System.currentTimeMillis() + undeployTimeout;
// Deployment to undeploy.
final SharedDeployment undep = doomed;
ctx.timeout()
.addTimeoutObject(
new GridTimeoutObject() {
@Override
public GridUuid timeoutId() {
return undep.classLoaderId();
}
@Override
public long endTime() {
return endTime < 0 ? Long.MAX_VALUE : endTime;
}
@Override
public void onTimeout() {
boolean removed = false;
// Hot redeployment.
synchronized (mux) {
assert undep.isPendingUndeploy();
if (!undep.isUndeployed()) {
undep.undeploy();
undep.onRemoved();
removed = true;
Collection<SharedDeployment> deps = cache.get(undep.userVersion());
if (deps != null) {
for (Iterator<SharedDeployment> i = deps.iterator(); i.hasNext(); )
if (i.next() == undep) i.remove();
if (deps.isEmpty()) cache.remove(undep.userVersion());
}
if (log.isInfoEnabled())
log.info(
"Undeployed class loader due to deployment mode change, "
+ "user version change, or hot redeployment: "
+ undep);
}
}
// Outside synchronization.
if (removed) undep.recordUndeployed(null);
}
});
}
}
}
}
if (newDep != null) {
List<SharedDeployment> list =
F.addIfAbsent(cache, meta.userVersion(), F.<SharedDeployment>newList());
assert list != null;
list.add(newDep);
}
return F.t(true, newDep);
}
/** {@inheritDoc} */
@Override
public GridDeployment getDeployment(GridDeploymentMetadata meta) {
assert meta != null;
assert ctx.config().isPeerClassLoadingEnabled();
// Validate metadata.
assert meta.classLoaderId() != null;
assert meta.senderNodeId() != null;
assert meta.sequenceNumber() >= -1;
assert meta.parentLoader() == null;
if (log.isDebugEnabled())
log.debug("Starting to peer-load class based on deployment metadata: " + meta);
while (true) {
List<SharedDeployment> depsToCheck = null;
SharedDeployment dep = null;
synchronized (mux) {
// Check obsolete request.
if (isDeadClassLoader(meta)) return null;
List<SharedDeployment> deps = cache.get(meta.userVersion());
if (deps != null) {
assert !deps.isEmpty();
for (SharedDeployment d : deps) {
if (d.hasParticipant(meta.senderNodeId(), meta.classLoaderId())
|| meta.senderNodeId().equals(ctx.localNodeId())) {
// Done.
dep = d;
break;
}
}
if (dep == null) {
GridTuple2<Boolean, SharedDeployment> redeployCheck = checkRedeploy(meta);
if (!redeployCheck.get1()) {
// Checking for redeployment encountered invalid state.
if (log.isDebugEnabled())
log.debug("Checking for redeployment encountered invalid state: " + meta);
return null;
}
dep = redeployCheck.get2();
if (dep == null) {
// Find existing deployments that need to be checked
// whether they should be reused for this request.
for (SharedDeployment d : deps) {
if (!d.isPendingUndeploy() && !d.isUndeployed()) {
if (depsToCheck == null) depsToCheck = new LinkedList<SharedDeployment>();
if (log.isDebugEnabled()) log.debug("Adding deployment to check: " + d);
depsToCheck.add(d);
}
}
// If no deployment can be reused, create a new one.
if (depsToCheck == null) {
dep = createNewDeployment(meta, false);
deps.add(dep);
}
}
}
} else {
GridTuple2<Boolean, SharedDeployment> redeployCheck = checkRedeploy(meta);
if (!redeployCheck.get1()) {
// Checking for redeployment encountered invalid state.
if (log.isDebugEnabled())
log.debug("Checking for redeployment encountered invalid state: " + meta);
return null;
}
dep = redeployCheck.get2();
if (dep == null)
// Create peer class loader.
dep = createNewDeployment(meta, true);
}
}
if (dep != null) {
if (log.isDebugEnabled())
log.debug("Found SHARED or CONTINUOUS deployment after first check: " + dep);
// Cache the deployed class.
Class<?> cls = dep.deployedClass(meta.className(), meta.alias());
if (cls == null) {
U.warn(
log,
"Failed to load peer class (ignore if class got undeployed during preloading) [alias="
+ meta.alias()
+ ", dep="
+ dep
+ ']');
return null;
}
return dep;
}
assert meta.parentLoader() == null;
assert depsToCheck != null;
assert !depsToCheck.isEmpty();
/*
* Logic below must be performed outside of synchronization
* because it involves network calls.
*/
// Check if class can be loaded from existing nodes.
// In most cases this loop will find something.
for (SharedDeployment d : depsToCheck) {
// Load class. Note, that remote node will not load this class.
// The class will only be loaded on this node.
Class<?> cls = d.deployedClass(meta.className(), meta.alias());
if (cls != null) {
synchronized (mux) {
if (!d.isUndeployed() && !d.isPendingUndeploy()) {
if (!addParticipant(d, meta)) return null;
if (log.isDebugEnabled())
log.debug(
"Acquired deployment after verifying it's availability on "
+ "existing nodes [depCls="
+ cls
+ ", dep="
+ d
+ ", meta="
+ meta
+ ']');
return d;
}
}
} else if (log.isDebugEnabled()) {
log.debug(
"Deployment cannot be reused (class does not exist on participating nodes) [dep="
+ d
+ ", meta="
+ meta
+ ']');
}
}
// We are here either because all participant nodes failed
// or the class indeed should have a separate deployment.
for (SharedDeployment d : depsToCheck) {
// Temporary class loader.
ClassLoader temp =
new GridDeploymentClassLoader(
GridUuid.randomUuid(),
meta.userVersion(),
meta.deploymentMode(),
true,
ctx,
ctxLdr,
meta.classLoaderId(),
meta.senderNodeId(),
meta.sequenceNumber(),
comm,
ctx.config().getNetworkTimeout(),
log,
ctx.config().getPeerClassLoadingClassPathExclude(),
0,
false);
String path = U.classNameToResourceName(d.sampleClassName());
// We check if any random class from existing deployment can be
// loaded from sender node. If it can, then we reuse existing
// deployment.
InputStream rsrcIn = temp.getResourceAsStream(path);
if (rsrcIn != null) {
// We don't need the actual stream.
U.closeQuiet(rsrcIn);
synchronized (mux) {
if (d.isUndeployed() || d.isPendingUndeploy()) continue;
// Add new node prior to loading the class, so we attempt
// to load the class from the latest node.
if (!addParticipant(d, meta)) {
if (log.isDebugEnabled())
log.debug(
"Failed to add participant to deployment "
+ "[meta="
+ meta
+ ", dep="
+ dep
+ ']');
return null;
}
}
Class<?> depCls = d.deployedClass(meta.className(), meta.alias());
if (depCls == null) {
U.error(
log,
"Failed to peer load class after loading it as a resource [alias="
+ meta.alias()
+ ", dep="
+ dep
+ ']');
return null;
}
if (log.isDebugEnabled())
log.debug(
"Acquired deployment class after verifying other class "
+ "availability on sender node [depCls="
+ depCls
+ ", rndCls="
+ d.sampleClass()
+ ", sampleClsName="
+ d.sampleClassName()
+ ", meta="
+ meta
+ ']');
return d;
} else if (log.isDebugEnabled())
log.debug(
"Deployment cannot be reused (random class could not be loaded from sender node) [dep="
+ d
+ ", meta="
+ meta
+ ']');
}
synchronized (mux) {
if (log.isDebugEnabled())
log.debug(
"None of the existing class-loaders fit (will try to create a new one): " + meta);
// Check obsolete request.
if (isDeadClassLoader(meta)) return null;
// Check that deployment picture has not changed.
List<SharedDeployment> deps = cache.get(meta.userVersion());
if (deps != null) {
assert !deps.isEmpty();
boolean retry = false;
for (SharedDeployment d : deps) {
// Double check if sender was already added.
if (d.hasParticipant(meta.senderNodeId(), meta.classLoaderId())) {
dep = d;
retry = false;
break;
}
// New deployment was added while outside of synchronization.
// Need to recheck it again.
if (!d.isPendingUndeploy() && !d.isUndeployed() && !depsToCheck.contains(d))
retry = true;
}
if (retry) {
if (log.isDebugEnabled()) log.debug("Retrying due to concurrency issues: " + meta);
// Outer while loop.
continue;
}
if (dep == null) {
// No new deployments were added, so we can safely add ours.
dep = createNewDeployment(meta, false);
deps.add(dep);
if (log.isDebugEnabled())
log.debug(
"Adding new deployment within second check [dep=" + dep + ", meta=" + meta + ']');
}
} else {
dep = createNewDeployment(meta, true);
if (log.isDebugEnabled())
log.debug(
"Created new deployment within second check [dep=" + dep + ", meta=" + meta + ']');
}
}
if (dep != null) {
// Cache the deployed class.
Class<?> cls = dep.deployedClass(meta.className(), meta.alias());
if (cls == null) {
U.warn(
log,
"Failed to load peer class (ignore if class got undeployed during preloading) [alias="
+ meta.alias()
+ ", dep="
+ dep
+ ']');
return null;
}
}
return dep;
}
}
