public void route(final ServerMessage message, final RoutingContext context) throws Exception {
// We must make a copy of the message, otherwise things like returning credits to the page won't
// work
// properly on ack, since the original address will be overwritten
// TODO we can optimise this so it doesn't copy if it's not routed anywhere else
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace("Diverting message " + message + " into " + this);
}
long id = storageManager.generateUniqueID();
ServerMessage copy = message.copy(id);
copy.finishCopy();
// This will set the original MessageId, and the original address
copy.setOriginalHeaders(message, null, false);
copy.setAddress(forwardAddress);
if (transformer != null) {
copy = transformer.transform(copy);
}
postOffice.route(copy, context.getTransaction(), false);
}
public synchronized void xaPrepare(final Xid xid) throws Exception {
if (tx != null && tx.getXid().equals(xid)) {
final String msg =
"Cannot commit, session is currently doing work in a transaction " + tx.getXid();
throw new HornetQXAException(XAException.XAER_PROTO, msg);
} else {
Transaction theTx = resourceManager.getTransaction(xid);
if (isTrace) {
HornetQServerLogger.LOGGER.trace("xaprepare into " + ", xid=" + xid + ", tx= " + tx);
}
if (theTx == null) {
final String msg = "Cannot find xid in resource manager: " + xid;
throw new HornetQXAException(XAException.XAER_NOTA, msg);
} else {
if (theTx.getState() == Transaction.State.SUSPENDED) {
throw new HornetQXAException(
XAException.XAER_PROTO, "Cannot prepare transaction, it is suspended " + xid);
} else if (theTx.getState() == Transaction.State.PREPARED) {
HornetQServerLogger.LOGGER.info("ignoring prepare on xid as already called :" + xid);
} else {
theTx.prepare();
}
}
}
}
/**
* Activates several cluster services. Used by backups on failover.
*
* @throws Exception
*/
public synchronized void activate() throws Exception {
if (state != State.STARTED && state != State.DEPLOYED) return;
if (backup) {
backup = false;
deployConfiguredBridges();
for (BroadcastGroup broadcastGroup : broadcastGroups.values()) {
try {
broadcastGroup.start();
} catch (Exception e) {
HornetQServerLogger.LOGGER.unableToStartBroadcastGroup(e, broadcastGroup.getName());
}
}
for (ClusterConnection clusterConnection : clusterConnections.values()) {
try {
clusterConnection.activate();
} catch (Exception e) {
HornetQServerLogger.LOGGER.unableToStartClusterConnection(e, clusterConnection.getName());
}
}
for (Bridge bridge : bridges.values()) {
try {
bridge.start();
} catch (Exception e) {
HornetQServerLogger.LOGGER.unableToStartBridge(e, bridge.getName());
}
}
}
}
public void nodeDown(final long eventUID, final String nodeID) {
if (stopping) {
return;
}
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(
this + " receiving nodeDown for nodeID=" + nodeID, new Exception("trace"));
}
if (nodeID.equals(nodeManager.getNodeId().toString())) {
return;
}
// Remove the flow record for that node
MessageFlowRecord record = records.remove(nodeID);
if (record != null) {
try {
if (isTrace) {
HornetQServerLogger.LOGGER.trace("Closing clustering record " + record);
}
record.close();
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorClosingFlowRecord(e);
}
}
}
public synchronized void freeze(final CoreRemotingConnection connectionToKeepOpen) {
if (!started) return;
failureCheckAndFlushThread.close(false);
for (Acceptor acceptor : acceptors) {
try {
acceptor.pause();
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorStoppingAcceptor();
}
}
HashMap<Object, ConnectionEntry> connectionEntries =
new HashMap<Object, ConnectionEntry>(connections);
// Now we ensure that no connections will process any more packets after this method is
// complete then send a disconnect packet
for (Entry<Object, ConnectionEntry> entry : connectionEntries.entrySet()) {
RemotingConnection conn = entry.getValue().connection;
if (conn.equals(connectionToKeepOpen)) continue;
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace("Sending connection.disconnection packet to " + conn);
}
if (!conn.isClient()) {
conn.disconnect(false);
connections.remove(entry.getKey());
}
}
}
public synchronized void xaStart(final Xid xid) throws Exception {
if (tx != null) {
HornetQServerLogger.LOGGER.xidReplacedOnXStart(tx.getXid().toString(), xid.toString());
try {
if (tx.getState() != Transaction.State.PREPARED) {
// we don't want to rollback anything prepared here
if (tx.getXid() != null) {
resourceManager.removeTransaction(tx.getXid());
}
tx.rollback();
}
} catch (Exception e) {
HornetQServerLogger.LOGGER.debug(
"An exception happened while we tried to debug the previous tx, we can ignore this exception",
e);
}
}
tx = newTransaction(xid);
if (isTrace) {
HornetQServerLogger.LOGGER.trace("xastart into tx= " + tx);
}
boolean added = resourceManager.putTransaction(xid, tx);
if (!added) {
final String msg = "Cannot start, there is already a xid " + tx.getXid();
throw new HornetQXAException(XAException.XAER_DUPID, msg);
}
}
/** This method is synchronized because we want it to be atomic with the cursors being used */
private long checkMinPage(Collection<PageSubscription> cursorList) {
long minPage = Long.MAX_VALUE;
for (PageSubscription cursor : cursorList) {
long firstPage = cursor.getFirstPage();
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(
this.pagingStore.getAddress()
+ " has a cursor "
+ cursor
+ " with first page="
+ firstPage);
}
// the cursor will return -1 if the cursor is empty
if (firstPage >= 0 && firstPage < minPage) {
minPage = firstPage;
}
}
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(this.pagingStore.getAddress() + " has minPage=" + minPage);
}
return minPage;
}
public synchronized void xaRollback(final Xid xid) throws Exception {
if (tx != null && tx.getXid().equals(xid)) {
final String msg =
"Cannot roll back, session is currently doing work in a transaction " + tx.getXid();
throw new HornetQXAException(XAException.XAER_PROTO, msg);
} else {
Transaction theTx = resourceManager.removeTransaction(xid);
if (isTrace) {
HornetQServerLogger.LOGGER.trace("xarollback into " + theTx);
}
if (theTx == null) {
// checked heuristic committed transactions
if (resourceManager.getHeuristicCommittedTransactions().contains(xid)) {
throw new HornetQXAException(
XAException.XA_HEURCOM, "transaction has ben heuristically committed: " + xid);
}
// checked heuristic rolled back transactions
else if (resourceManager.getHeuristicRolledbackTransactions().contains(xid)) {
throw new HornetQXAException(
XAException.XA_HEURRB, "transaction has ben heuristically rolled back: " + xid);
} else {
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"xarollback into " + theTx + ", xid=" + xid + " forcing a rollback regular");
}
try {
// jbpapp-8845
// This could have happened because the TX timed out,
// at this point we would be better on rolling back this session as a way to prevent
// consumers from holding their messages
this.rollback(false);
} catch (Exception e) {
HornetQServerLogger.LOGGER.warn(e.getMessage(), e);
}
throw new HornetQXAException(
XAException.XAER_NOTA, "Cannot find xid in resource manager: " + xid);
}
} else {
if (theTx.getState() == Transaction.State.SUSPENDED) {
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"xarollback into " + theTx + " sending tx back as it was suspended");
}
// Put it back
resourceManager.putTransaction(xid, tx);
throw new HornetQXAException(
XAException.XAER_PROTO, "Cannot rollback transaction, it is suspended " + xid);
} else {
doRollback(false, false, theTx);
}
}
}
}
public void markAsRollbackOnly(final HornetQException exception1) {
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug("Marking Transaction " + this.id + " as rollback only");
}
state = State.ROLLBACK_ONLY;
this.exception = exception1;
}
public void waitContextCompletion() {
try {
if (!context.waitCompletion(10000)) {
HornetQServerLogger.LOGGER.errorCompletingContext(new Exception("warning"));
}
} catch (Exception e) {
HornetQServerLogger.LOGGER.warn(e.getMessage(), e);
}
}
/**
* Notifies the backup that the live server is stopping.
*
* <p>This notification allows the backup to skip quorum voting (or any other measure to avoid
* 'split-brain') and do a faster fail-over.
*
* @return
*/
public OperationContext sendLiveIsStopping(final LiveStopping finalMessage) {
HornetQServerLogger.LOGGER.warn(
"LIVE IS STOPPING?!? message=" + finalMessage + " enabled=" + enabled);
if (enabled) {
HornetQServerLogger.LOGGER.warn(
"LIVE IS STOPPING?!? message=" + finalMessage + " " + enabled);
return sendReplicatePacket(new ReplicationLiveIsStoppingMessage(finalMessage));
}
return null;
}
private synchronized void doConsumerCreated(final ClientMessage message) throws Exception {
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
ClusterConnectionImpl.this + " Consumer created " + message);
}
if (!message.containsProperty(ManagementHelper.HDR_DISTANCE)) {
throw new IllegalStateException("distance is null");
}
if (!message.containsProperty(ManagementHelper.HDR_CLUSTER_NAME)) {
throw new IllegalStateException("clusterName is null");
}
Integer distance = message.getIntProperty(ManagementHelper.HDR_DISTANCE);
SimpleString clusterName = message.getSimpleStringProperty(ManagementHelper.HDR_CLUSTER_NAME);
message.putIntProperty(ManagementHelper.HDR_DISTANCE, distance + 1);
SimpleString filterString =
message.getSimpleStringProperty(ManagementHelper.HDR_FILTERSTRING);
RemoteQueueBinding binding = bindings.get(clusterName);
if (binding == null) {
throw new IllegalStateException(
"Cannot find binding for " + clusterName + " on " + ClusterConnectionImpl.this);
}
binding.addConsumer(filterString);
// Need to propagate the consumer add
TypedProperties props = new TypedProperties();
props.putSimpleStringProperty(ManagementHelper.HDR_ADDRESS, binding.getAddress());
props.putSimpleStringProperty(ManagementHelper.HDR_CLUSTER_NAME, clusterName);
props.putSimpleStringProperty(ManagementHelper.HDR_ROUTING_NAME, binding.getRoutingName());
props.putIntProperty(ManagementHelper.HDR_DISTANCE, distance + 1);
Queue theQueue = (Queue) binding.getBindable();
props.putIntProperty(ManagementHelper.HDR_CONSUMER_COUNT, theQueue.getConsumerCount());
if (filterString != null) {
props.putSimpleStringProperty(ManagementHelper.HDR_FILTERSTRING, filterString);
}
Notification notification = new Notification(null, CONSUMER_CREATED, props);
managementService.sendNotification(notification);
}
public void connectionFailed(final HornetQException me, boolean failedOver) {
try {
HornetQServerLogger.LOGGER.clientConnectionFailed(name);
close(true);
HornetQServerLogger.LOGGER.clientConnectionFailedClearingSession(name);
} catch (Throwable t) {
HornetQServerLogger.LOGGER.errorClosingConnection(this);
}
}
public void bufferReceived(final Object connectionID, final HornetQBuffer buffer) {
ConnectionEntry conn = connections.get(connectionID);
if (conn != null) {
conn.connection.bufferReceived(connectionID, buffer);
} else {
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
"ConnectionID = " + connectionID + " was already closed, so ignoring packet");
}
}
}
public void stop() throws Exception {
if (!started) {
return;
}
stopping = true;
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(this + "::stopping ClusterConnection");
}
if (serverLocator != null) {
serverLocator.removeClusterTopologyListener(this);
}
HornetQServerLogger.LOGGER.debug(
"Cluster connection being stopped for node"
+ nodeManager.getNodeId()
+ ", server = "
+ this.server
+ " serverLocator = "
+ serverLocator);
synchronized (this) {
for (MessageFlowRecord record : records.values()) {
try {
record.close();
} catch (Exception ignore) {
}
}
}
if (managementService != null) {
TypedProperties props = new TypedProperties();
props.putSimpleStringProperty(new SimpleString("name"), name);
Notification notification =
new Notification(
nodeManager.getNodeId().toString(),
NotificationType.CLUSTER_CONNECTION_STOPPED,
props);
managementService.sendNotification(notification);
}
executor.execute(
new Runnable() {
public void run() {
synchronized (ClusterConnectionImpl.this) {
closeLocator(serverLocator);
serverLocator = null;
}
}
});
started = false;
}
private void doBindingRemoved(final ClientMessage message) throws Exception {
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
ClusterConnectionImpl.this + " Removing binding " + message);
}
if (!message.containsProperty(ManagementHelper.HDR_CLUSTER_NAME)) {
throw new IllegalStateException("clusterName is null");
}
SimpleString clusterName = message.getSimpleStringProperty(ManagementHelper.HDR_CLUSTER_NAME);
removeBinding(clusterName);
}
public synchronized void run() {
// if the reference was busy during the previous iteration, handle it now
if (current != null) {
try {
HandleStatus status = handle(current);
if (status == HandleStatus.BUSY) {
return;
}
if (status == HandleStatus.HANDLED) {
proceedDeliver(current);
}
current = null;
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorBrowserHandlingMessage(e, current);
return;
}
}
MessageReference ref = null;
HandleStatus status;
while (true) {
try {
ref = null;
synchronized (messageQueue) {
if (!iterator.hasNext()) {
break;
}
ref = iterator.next();
status = handle(ref);
}
if (status == HandleStatus.HANDLED) {
proceedDeliver(ref);
} else if (status == HandleStatus.BUSY) {
// keep a reference on the current message reference
// to handle it next time the browser deliverer is executed
current = ref;
break;
}
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorBrowserHandlingMessage(e, ref);
break;
}
}
}
public ServerLocatorInternal createServerLocator() {
if (tcConfigs != null && tcConfigs.length > 0) {
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(
ClusterConnectionImpl.this
+ "Creating a serverLocator for "
+ Arrays.toString(tcConfigs));
}
ServerLocatorImpl locator = new ServerLocatorImpl(topology, true, tcConfigs);
locator.setClusterConnection(true);
return locator;
}
return null;
}
public void createQueue(
final SimpleString address,
final SimpleString name,
final SimpleString filterString,
final boolean temporary,
final boolean durable)
throws Exception {
if (durable) {
// make sure the user has privileges to create this queue
securityStore.check(address, CheckType.CREATE_DURABLE_QUEUE, this);
} else {
securityStore.check(address, CheckType.CREATE_NON_DURABLE_QUEUE, this);
}
Queue queue = server.createQueue(address, name, filterString, durable, temporary);
if (temporary) {
// Temporary queue in core simply means the queue will be deleted if
// the remoting connection
// dies. It does not mean it will get deleted automatically when the
// session is closed.
// It is up to the user to delete the queue when finished with it
TempQueueCleanerUpper cleaner = new TempQueueCleanerUpper(server, name);
remotingConnection.addCloseListener(cleaner);
remotingConnection.addFailureListener(cleaner);
tempQueueCleannerUppers.put(name, cleaner);
}
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug(
"Queue "
+ name
+ " created on address "
+ name
+ " with filter="
+ filterString
+ " temporary = "
+ temporary
+ " durable="
+ durable
+ " on session user="******", connection="
+ this.remotingConnection);
}
}
private void run() {
try {
if (HornetQServerLogger.LOGGER.isDebugEnabled()) {
HornetQServerLogger.LOGGER.debug("deleting temporary queue " + bindingName);
}
try {
server.destroyQueue(bindingName, null, false);
} catch (HornetQException e) {
// that's fine.. it can happen due to queue already been deleted
HornetQServerLogger.LOGGER.debug(e.getMessage(), e);
}
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorRemovingTempQueue(e, bindingName);
}
}
@Override
public void connectionFailed(final HornetQException me, boolean failedOver) {
if (me.getType() == HornetQExceptionType.DISCONNECTED) {
// Backup has shut down - no need to log a stack trace
HornetQServerLogger.LOGGER.replicationStopOnBackupShutdown();
} else {
HornetQServerLogger.LOGGER.replicationStopOnBackupFail(me);
}
try {
stop();
} catch (Exception e) {
HornetQServerLogger.LOGGER.errorStoppingReplication(e);
}
}
public LinkedList<MessageReference> cancelRefs(
final boolean failed, final boolean lastConsumedAsDelivered, final Transaction tx)
throws Exception {
boolean performACK = lastConsumedAsDelivered;
try {
if (largeMessageDeliverer != null) {
largeMessageDeliverer.finish();
}
} catch (Throwable e) {
HornetQServerLogger.LOGGER.errorResttingLargeMessage(e, largeMessageDeliverer);
} finally {
largeMessageDeliverer = null;
}
LinkedList<MessageReference> refs = new LinkedList<MessageReference>();
if (!deliveringRefs.isEmpty()) {
for (MessageReference ref : deliveringRefs) {
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"Cancelling reference for messageID = "
+ ref.getMessage().getMessageID()
+ ", ref = "
+ ref);
}
if (performACK) {
acknowledge(false, tx, ref.getMessage().getMessageID());
performACK = false;
} else {
if (!failed) {
// We don't decrement delivery count if the client failed, since there's a possibility
// that refs
// were actually delivered but we just didn't get any acks for them
// before failure
ref.decrementDeliveryCount();
}
refs.add(ref);
}
}
deliveringRefs.clear();
}
return refs;
}
public synchronized void xaFailed(final Xid xid) throws Exception {
if (tx != null) {
final String msg =
"Cannot start, session is already doing work in a transaction " + tx.getXid();
throw new HornetQXAException(XAException.XAER_PROTO, msg);
} else {
tx = newTransaction(xid);
tx.markAsRollbackOnly(
new HornetQException("Can't commit as a Failover happened during the operation"));
if (isTrace) {
HornetQServerLogger.LOGGER.trace("xastart into tx= " + tx);
}
boolean added = resourceManager.putTransaction(xid, tx);
if (!added) {
final String msg = "Cannot start, there is already a xid " + tx.getXid();
throw new HornetQXAException(XAException.XAER_DUPID, msg);
}
}
}
/**
* @param ref
* @param message
*/
private void deliverStandardMessage(final MessageReference ref, final ServerMessage message) {
int packetSize = callback.sendMessage(message, id, ref.getDeliveryCount());
if (availableCredits != null) {
availableCredits.addAndGet(-packetSize);
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace(
this
+ "::FlowControl::delivery standard taking "
+ packetSize
+ " from credits, available now is "
+ availableCredits);
}
}
}
public void setTransferring(final boolean transferring) {
synchronized (lock) {
// This is to make sure that the delivery process has finished any pending delivery
// otherwise a message may sneak in on the client while we are trying to stop the consumer
lockDelivery.writeLock().lock();
try {
this.transferring = transferring;
} finally {
lockDelivery.writeLock().unlock();
}
}
// Outside the lock
if (transferring) {
// And we must wait for any force delivery to be executed - this is executed async so we add a
// future to the
// executor and
// wait for it to complete
FutureLatch future = new FutureLatch();
messageQueue.getExecutor().execute(future);
boolean ok = future.await(10000);
if (!ok) {
HornetQServerLogger.LOGGER.errorTransferringConsumer();
}
}
if (!transferring) {
promptDelivery();
}
}
public void close() throws Exception {
if (isTrace) {
HornetQServerLogger.LOGGER.trace("Stopping bridge " + bridge);
}
isClosed = true;
clearBindings();
if (disconnected) {
bridge.disconnect();
}
bridge.stop();
bridge
.getExecutor()
.execute(
new Runnable() {
public void run() {
try {
if (disconnected) {
targetLocator.cleanup();
} else {
targetLocator.close();
}
} catch (Exception ignored) {
HornetQServerLogger.LOGGER.debug(ignored.getMessage(), ignored);
}
}
});
}
public void connectionDestroyed(final Object connectionID) {
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"Connection removed " + connectionID + " from server " + this.server,
new Exception("trace"));
}
ConnectionEntry conn = connections.get(connectionID);
if (conn != null) {
// Bit of a hack - find a better way to do this
List<FailureListener> failureListeners = conn.connection.getFailureListeners();
boolean empty = true;
for (FailureListener listener : failureListeners) {
if (listener instanceof ServerSessionImpl) {
empty = false;
break;
}
}
// We only destroy the connection if the connection has no sessions attached to it
// Otherwise it means the connection has died without the sessions being closed first
// so we need to keep them for ttl, in case re-attachment occurs
if (empty) {
connections.remove(connectionID);
conn.connection.destroy();
}
}
}
public void sendLarge(final MessageInternal message) throws Exception {
// need to create the LargeMessage before continue
long id = storageManager.generateUniqueID();
LargeServerMessage largeMsg = storageManager.createLargeMessage(id, message);
if (HornetQServerLogger.LOGGER.isTraceEnabled()) {
HornetQServerLogger.LOGGER.trace("sendLarge::" + largeMsg);
}
if (currentLargeMessage != null) {
HornetQServerLogger.LOGGER.replacingIncompleteLargeMessage(
currentLargeMessage.getMessageID());
}
currentLargeMessage = largeMsg;
}
public synchronized void xaCommit(final Xid xid, final boolean onePhase) throws Exception {
if (tx != null && tx.getXid().equals(xid)) {
final String msg =
"Cannot commit, session is currently doing work in transaction " + tx.getXid();
throw new HornetQXAException(XAException.XAER_PROTO, msg);
} else {
Transaction theTx = resourceManager.removeTransaction(xid);
if (isTrace) {
HornetQServerLogger.LOGGER.trace("XAcommit into " + theTx + ", xid=" + xid);
}
if (theTx == null) {
// checked heuristic committed transactions
if (resourceManager.getHeuristicCommittedTransactions().contains(xid)) {
throw new HornetQXAException(
XAException.XA_HEURCOM, "transaction has been heuristically committed: " + xid);
}
// checked heuristic rolled back transactions
else if (resourceManager.getHeuristicRolledbackTransactions().contains(xid)) {
throw new HornetQXAException(
XAException.XA_HEURRB, "transaction has been heuristically rolled back: " + xid);
} else {
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"XAcommit into " + theTx + ", xid=" + xid + " cannot find it");
}
throw new HornetQXAException(
XAException.XAER_NOTA, "Cannot find xid in resource manager: " + xid);
}
} else {
if (theTx.getState() == Transaction.State.SUSPENDED) {
// Put it back
resourceManager.putTransaction(xid, theTx);
throw new HornetQXAException(
XAException.XAER_PROTO, "Cannot commit transaction, it is suspended " + xid);
} else {
theTx.commit(onePhase);
}
}
}
}
public PageCache getPageCache(final long pageId) {
try {
boolean needToRead = false;
PageCache cache = null;
synchronized (softCache) {
if (pageId > pagingStore.getCurrentWritingPage()) {
return null;
}
cache = softCache.get(pageId);
if (cache == null) {
if (!pagingStore.checkPageFileExists((int) pageId)) {
return null;
}
cache = createPageCache(pageId);
needToRead = true;
// anyone reading from this cache will have to wait reading to finish first
// we also want only one thread reading this cache
cache.lock();
if (isTrace) {
HornetQServerLogger.LOGGER.trace(
"adding " + pageId + " into cursor = " + this.pagingStore.getAddress());
}
softCache.put(pageId, cache);
}
}
// Reading is done outside of the synchronized block, however
// the page stays locked until the entire reading is finished
if (needToRead) {
Page page = null;
try {
page = pagingStore.createPage((int) pageId);
storageManager.beforePageRead();
page.open();
List<PagedMessage> pgdMessages = page.read(storageManager);
cache.setMessages(pgdMessages.toArray(new PagedMessage[pgdMessages.size()]));
} finally {
try {
if (page != null) {
page.close();
}
} catch (Throwable ignored) {
}
storageManager.afterPageRead();
cache.unlock();
}
}
return cache;
} catch (Exception e) {
throw new RuntimeException(
"Couldn't complete paging due to an IO Exception on Paging - " + e.getMessage(), e);
}
}