/**
* @param packet the packet to intercept
* @return the name of the interceptor that returned <code>false</code> or <code>null</code> if no
* interceptors returned <code>false</code>.
*/
public static String invokeInterceptors(
final Packet packet,
final List<Interceptor> interceptors,
final RemotingConnection connection) {
if (interceptors != null) {
for (final Interceptor interceptor : interceptors) {
try {
boolean callNext = interceptor.intercept(packet, connection);
if (HornetQClientLogger.LOGGER.isDebugEnabled()) {
// use a StringBuilder for speed since this may be executed a lot
StringBuilder msg = new StringBuilder();
msg.append("Invocation of interceptor ")
.append(interceptor.getClass().getName())
.append(" on ")
.append(packet)
.append(" returned ")
.append(callNext);
HornetQClientLogger.LOGGER.debug(msg.toString());
}
if (!callNext) {
return interceptor.getClass().getName();
}
} catch (final Throwable e) {
HornetQClientLogger.LOGGER.errorCallingInterceptor(e, interceptor);
}
}
}
return null;
}
/**
* Due to networking issues or server issues the server may take longer to answer than expected..
* the client may timeout the call throwing an exception and the client could eventually retry
* another call, but the server could then answer a previous command issuing a
* class-cast-exception. The expectedPacket will be used to filter out undesirable packets that
* would belong to previous calls.
*/
public Packet sendBlocking(final Packet packet, byte expectedPacket) throws HornetQException {
String interceptionResult = invokeInterceptors(packet, interceptors, connection);
if (interceptionResult != null) {
// if we don't throw an exception here the client might not unblock
throw HornetQClientMessageBundle.BUNDLE.interceptorRejectedPacket(interceptionResult);
}
if (closed) {
throw HornetQClientMessageBundle.BUNDLE.connectionDestroyed();
}
if (connection.getBlockingCallTimeout() == -1) {
throw new IllegalStateException(
"Cannot do a blocking call timeout on a server side connection");
}
// Synchronized since can't be called concurrently by more than one thread and this can occur
// E.g. blocking acknowledge() from inside a message handler at some time as other operation on
// main thread
synchronized (sendBlockingLock) {
packet.setChannelID(id);
final HornetQBuffer buffer = packet.encode(connection);
lock.lock();
try {
if (failingOver) {
try {
if (connection.getBlockingCallFailoverTimeout() < 0) {
while (failingOver) {
failoverCondition.await();
}
} else {
if (!failoverCondition.await(
connection.getBlockingCallFailoverTimeout(), TimeUnit.MILLISECONDS)) {
HornetQClientLogger.LOGGER.debug("timed-out waiting for failover condition");
}
}
} catch (InterruptedException e) {
throw new HornetQInterruptedException(e);
}
}
response = null;
if (resendCache != null && packet.isRequiresConfirmations()) {
resendCache.add(packet);
}
connection.getTransportConnection().write(buffer, false, false);
long toWait = connection.getBlockingCallTimeout();
long start = System.currentTimeMillis();
while (!closed
&& (response == null
|| (response.getType() != PacketImpl.EXCEPTION
&& response.getType() != expectedPacket))
&& toWait > 0) {
try {
sendCondition.await(toWait, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
throw new HornetQInterruptedException(e);
}
if (response != null
&& response.getType() != PacketImpl.EXCEPTION
&& response.getType() != expectedPacket) {
HornetQClientLogger.LOGGER.packetOutOfOrder(response, new Exception("trace"));
}
if (closed) {
break;
}
final long now = System.currentTimeMillis();
toWait -= now - start;
start = now;
}
if (response == null) {
throw HornetQClientMessageBundle.BUNDLE.timedOutSendingPacket(packet.getType());
}
if (response.getType() == PacketImpl.EXCEPTION) {
final HornetQExceptionMessage mem = (HornetQExceptionMessage) response;
HornetQException e = mem.getException();
e.fillInStackTrace();
throw e;
}
} finally {
lock.unlock();
}
return response;
}
}