/**
* Dispatches a message to the appropriate receiver.
*
* <p>It will buffer the message under the following conditions: 1) The MessageReceiver is not yet
* registered. 2) The MessageReceiver is a PastryAppl, and localNode.isReady() == false
*
* @param msg the message.
* @return true if message could be dispatched, false otherwise.
*/
public boolean dispatchMessage(Message msg) {
if (msg.getDestination() == 0) {
Logger logger =
localNode.getEnvironment().getLogManager().getLogger(MessageDispatch.class, null);
if (logger.level <= Logger.WARNING)
logger.logException(
"Message " + msg + "," + msg.getClass().getName() + " has no destination.",
new Exception("Stack Trace"));
return false;
}
// NOTE: There is no safety issue with calling localNode.isReady() because this is on the
// PastryThread, and the only way to set a node ready is also on the ready thread.
PastryAppl mr = (PastryAppl) addressBook.get(Integer.valueOf(msg.getDestination()));
if (mr == null) {
if ((logger.level <= Logger.FINE) || (localNode.isReady() && (logger.level <= Logger.INFO))) {
logger.log(
"Dropping message "
+ msg
+ " because the application address "
+ msg.getDestination()
+ " is unknown.");
}
return false;
} else {
mr.receiveMessage(msg);
return true;
}
}
/**
* Get a handle to a bootstrap node. This is only a simulation, so we pick the most recently
* created node.
*
* @return handle to bootstrap node, or null.
*/
private NodeHandle getBootstrap() {
NodeHandle bootstrap = null;
try {
PastryNode lastnode = (PastryNode) pastryNodes.lastElement();
bootstrap = lastnode.getLocalHandle();
} catch (NoSuchElementException e) {
}
return bootstrap;
}
/**
* Create a Pastry node and add it to pastryNodes. Also create a client application for this node.
*/
public void makePastryNode(int num) {
PastryNode pn = factory.newNode(getBootstrap());
pastryNodes.addElement(pn);
HelloWorldApp app = new HelloWorldApp(pn);
helloClients.addElement(app);
synchronized (pn) {
while (!pn.isReady()) {
try {
pn.wait(300);
} catch (InterruptedException ie) {
}
}
}
System.out.println("created " + num + " " + pn);
}
/** Print leafsets of all nodes in pastryNodes. */
private void printLeafSets() {
for (int i = 0; i < pastryNodes.size(); i++) {
PastryNode pn = (PastryNode) pastryNodes.get(i);
System.out.println(pn.getLeafSet().toString());
}
}
/** Constructor. */
public MessageDispatch(PastryNode pn, Deserializer deserializer) {
this.deserializer = deserializer;
addressBook = new HashMap<Integer, PastryAppl>();
this.localNode = pn;
this.logger = pn.getEnvironment().getLogManager().getLogger(getClass(), null);
}