/** {@inheritDoc} */
public boolean send(Message message) throws IOException {
if (closed) {
throw new IOException("Pipe closed");
}
Message msg = message.clone();
WireHeader header = new WireHeader();
header.setPipeID(getPipeID());
header.setSrcPeer(group.getPeerID());
header.setTTL(1);
header.setMsgId(WirePipe.createMsgId());
XMLDocument asDoc = (XMLDocument) header.getDocument(MimeMediaType.XMLUTF8);
MessageElement elem =
new TextDocumentMessageElement(WirePipeImpl.WIRE_HEADER_ELEMENT_NAME, asDoc, null);
msg.replaceMessageElement(WirePipeImpl.WIRE_HEADER_ELEMENT_NAMESPACE, elem);
checkMessenger();
try {
destMessenger.sendMessageB(msg, null, null);
} catch (IOException io) {
checkMessenger();
destMessenger.sendMessageB(msg, null, null);
}
return true;
}
/**
* Send a message to the peer which is represented by the current PeerViewElement.
*
* @param msg the message to send
* @param serviceName the service name on the destination peer to which the message will be
* demultiplexed
* @param serviceParam the service param on the destination peer to which the message will be
* demultiplexed
* @return true if the message was successfully handed off to the endpoint for delivery, false
* otherwise
*/
public boolean sendMessage(Message msg, String serviceName, String serviceParam) {
if (throttling) {
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("Declining to send -- throttling on " + this);
}
return false;
}
Messenger sendVia = getCachedMessenger();
if (null == sendVia) {
// There is nothing really we can do.
if (LOG.isEnabledFor(Level.WARN)) {
LOG.warn("Could not get messenger for " + getDestAddress());
}
OutgoingMessageEvent event =
new OutgoingMessageEvent(
msg, new IOException("Couldn't get messenger for " + getDestAddress()));
messageSendFailed(event);
return false;
}
sendVia.sendMessage(msg, serviceName, serviceParam, this);
return true;
}
/**
* Check the messenger to the remote peer and attempt to re-create the messenger if necessary.
*
* @return {@code true} if the current messenger is adequate.
* @throws IOException is thrown for errors in creating a new messenger.
*/
private synchronized boolean checkMessenger() throws IOException {
if ((destMessenger != null) && ((destMessenger.getState() & Messenger.USABLE) != 0)) {
// Everything fine!
return true;
}
// Try making a direct messenger first.
if (route != null) {
destMessenger = endpoint.getDirectMessenger(destination, route, true);
}
// Try making a regular messenger if that didn't work.
if ((destMessenger == null) || ((destMessenger.getState() & Messenger.TERMINAL) != 0)) {
destMessenger = null;
destMessenger = endpoint.getMessenger(destination, route);
}
// Dismal failure
if ((destMessenger == null) || ((destMessenger.getState() & Messenger.TERMINAL) != 0)) {
destMessenger = null;
throw new IOException("Unable to create a messenger to " + destination.toString());
}
return true;
}
/**
* Return a messenger suitable for sending to this peer.
*
* @return a messenger to this PVE peer or if <code>null</code> if peer is unreachable.
*/
private Messenger getCachedMessenger() {
boolean updateAlive = false;
synchronized (this) {
if ((null == cachedMessenger) || cachedMessenger.isClosed()) {
cachedMessenger = null;
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Getting cached Messenger for " + radv.getName());
}
updateAlive = true;
cachedMessenger = endpoint.getMessenger(getDestAddress(), radv.getRouteAdv());
}
}
if (updateAlive) {
setAlive(null != cachedMessenger);
}
return cachedMessenger;
}
