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package javax.mail;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import javax.mail.event.TransportEvent;
import javax.mail.event.TransportListener;
/**
* An abstract class that models a message transport.
* Subclasses provide actual implementations. <p>
*
* Note that <code>Transport</code> extends the <code>Service</code>
* class, which provides many common methods for naming transports,
* connecting to transports, and listening to connection events.
*
* @author John Mani
* @author Max Spivak
* @author Bill Shannon
*
* @see javax.mail.Service
* @see javax.mail.event.ConnectionEvent
* @see javax.mail.event.TransportEvent
*/
public abstract class Transport extends Service {
/**
* Constructor.
*
* @param session Session object for this Transport.
* @param urlname URLName object to be used for this Transport
*/
public Transport(Session session, URLName urlname) {
super(session, urlname);
}
/**
* Send a message. The message will be sent to all recipient
* addresses specified in the message (as returned from the
* <code>Message</code> method <code>getAllRecipients</code>),
* using message transports appropriate to each address. The
* <code>send</code> method calls the <code>saveChanges</code>
* method on the message before sending it. <p>
*
* If any of the recipient addresses is detected to be invalid by
* the Transport during message submission, a SendFailedException
* is thrown. Clients can get more detail about the failure by examining
* the exception. Whether or not the message is still sent successfully
* to any valid addresses depends on the Transport implementation. See
* SendFailedException for more details. Note also that success does
* not imply that the message was delivered to the ultimate recipient,
* as failures may occur in later stages of delivery. Once a Transport
* accepts a message for delivery to a recipient, failures that occur later
* should be reported to the user via another mechanism, such as
* returning the undeliverable message. <p>
*
* In typical usage, a SendFailedException reflects an error detected
* by the server. The details of the SendFailedException will usually
* contain the error message from the server (such as an SMTP error
* message). An address may be detected as invalid for a variety of
* reasons - the address may not exist, the address may have invalid
* syntax, the address may have exceeded its quota, etc. <p>
*
* Note that <code>send</code> is a static method that creates and
* manages its own connection. Any connection associated with any
* Transport instance used to invoke this method is ignored and not
* used. This method should only be invoked using the form
* <code>Transport.send(msg);</code>, and should never be invoked
* using an instance variable.
*
* @param msg the message to send
* @exception SendFailedException if the message could not
* be sent to some or any of the recipients.
* @exception MessagingException
* @see Message#saveChanges
* @see Message#getAllRecipients
* @see #send(Message, Address[])
* @see javax.mail.SendFailedException
*/
public static void send(Message msg) throws MessagingException {
msg.saveChanges(); // do this first
send0(msg, msg.getAllRecipients());
}
/**
* Send the message to the specified addresses, ignoring any
* recipients specified in the message itself. The
* <code>send</code> method calls the <code>saveChanges</code>
* method on the message before sending it. <p>
*
* @param msg the message to send
* @param addresses the addresses to which to send the message
* @exception SendFailedException if the message could not
* be sent to some or any of the recipients.
* @exception MessagingException
* @see Message#saveChanges
* @see #send(Message)
* @see javax.mail.SendFailedException
*/
public static void send(Message msg, Address[] addresses)
throws MessagingException {
msg.saveChanges();
send0(msg, addresses);
}
// send, but without the saveChanges
private static void send0(Message msg, Address[] addresses)
throws MessagingException {
if (addresses == null || addresses.length == 0)
throw new SendFailedException("No recipient addresses");
/*
* protocols is a hashtable containing the addresses
* indexed by address type
*/
Hashtable protocols = new Hashtable();
// Vectors of addresses
Vector invalid = new Vector();
Vector validSent = new Vector();
Vector validUnsent = new Vector();
for (int i = 0; i < addresses.length; i++) {
// is this address type already in the hashtable?
if (protocols.containsKey(addresses[i].getType())) {
Vector v = (Vector)protocols.get(addresses[i].getType());
v.addElement(addresses[i]);
} else {
// need to add a new protocol
Vector w = new Vector();
w.addElement(addresses[i]);
protocols.put(addresses[i].getType(), w);
}
}
int dsize = protocols.size();
if (dsize == 0)
throw new SendFailedException("No recipient addresses");
Session s = (msg.session != null) ? msg.session :
Session.getDefaultInstance(System.getProperties(), null);
Transport transport;
/*
* Optimize the case of a single protocol.
*/
if (dsize == 1) {
transport = s.getTransport(addresses[0]);
try {
transport.connect();
transport.sendMessage(msg, addresses);
} finally {
transport.close();
}
return;
}
/*
* More than one protocol. Have to do them one at a time
* and collect addresses and chain exceptions.
*/
MessagingException chainedEx = null;
boolean sendFailed = false;
Enumeration e = protocols.elements();
while (e.hasMoreElements()) {
Vector v = (Vector)e.nextElement();
Address[] protaddresses = new Address[v.size()];
v.copyInto(protaddresses);
// Get a Transport that can handle this address type.
if ((transport = s.getTransport(protaddresses[0])) == null) {
// Could not find an appropriate Transport ..
// Mark these addresses invalid.
for (int j = 0; j < protaddresses.length; j++)
invalid.addElement(protaddresses[j]);
continue;
}
try {
transport.connect();
transport.sendMessage(msg, protaddresses);
} catch (SendFailedException sex) {
sendFailed = true;
// chain the exception we're catching to any previous ones
if (chainedEx == null)
chainedEx = sex;
else
chainedEx.setNextException(sex);
// retrieve invalid addresses
Address[] a = sex.getInvalidAddresses();
if (a != null)
for (int j = 0; j < a.length; j++)
invalid.addElement(a[j]);
// retrieve validSent addresses
a = sex.getValidSentAddresses();
if (a != null)
for (int k = 0; k < a.length; k++)
validSent.addElement(a[k]);
// retrieve validUnsent addresses
Address[] c = sex.getValidUnsentAddresses();
if (c != null)
for (int l = 0; l < c.length; l++)
validUnsent.addElement(c[l]);
} catch (MessagingException mex) {
sendFailed = true;
// chain the exception we're catching to any previous ones
if (chainedEx == null)
chainedEx = mex;
else
chainedEx.setNextException(mex);
} finally {
transport.close();
}
}
// done with all protocols. throw exception if something failed
if (sendFailed || invalid.size() != 0 || validUnsent.size() != 0) {
Address[] a = null, b = null, c = null;
// copy address vectors into arrays
if (validSent.size() > 0) {
a = new Address[validSent.size()];
validSent.copyInto(a);
}
if (validUnsent.size() > 0) {
b = new Address[validUnsent.size()];
validUnsent.copyInto(b);
}
if (invalid.size() > 0) {
c = new Address[invalid.size()];
invalid.copyInto(c);
}
throw new SendFailedException("Sending failed", chainedEx,
a, b, c);
}
}
/**
* Send the Message to the specified list of addresses. An appropriate
* TransportEvent indicating the delivery status is delivered to any
* TransportListener registered on this Transport. Also, if any of
* the addresses is invalid, a SendFailedException is thrown.
* Whether or not the message is still sent succesfully to
* any valid addresses depends on the Transport implementation. <p>
*
* Unlike the static <code>send</code> method, the <code>sendMessage</code>
* method does <em>not</em> call the <code>saveChanges</code> method on
* the message; the caller should do so.
*
* @param msg The Message to be sent
* @param addresses array of addresses to send this message to
* @see javax.mail.event.TransportEvent
* @exception SendFailedException if the send failed because of
* invalid addresses.
* @exception MessagingException if the connection is dead or not in the
* connected state
*/
public abstract void sendMessage(Message msg, Address[] addresses)
throws MessagingException;
// Vector of Transport listeners
private Vector transportListeners = null;
/**
* Add a listener for Transport events. <p>
*
* The default implementation provided here adds this listener
* to an internal list of TransportListeners.
*
* @param l the Listener for Transport events
* @see javax.mail.event.TransportEvent
*/
public synchronized void addTransportListener(TransportListener l) {
if (transportListeners == null)
transportListeners = new Vector();
transportListeners.addElement(l);
}
/**
* Remove a listener for Transport events. <p>
*
* The default implementation provided here removes this listener
* from the internal list of TransportListeners.
*
* @param l the listener
* @see #addTransportListener
*/
public synchronized void removeTransportListener(TransportListener l) {
if (transportListeners != null)
transportListeners.removeElement(l);
}
/**
* Notify all TransportListeners. Transport implementations are
* expected to use this method to broadcast TransportEvents.<p>
*
* The provided default implementation queues the event into
* an internal event queue. An event dispatcher thread dequeues
* events from the queue and dispatches them to the registered
* TransportListeners. Note that the event dispatching occurs
* in a separate thread, thus avoiding potential deadlock problems.
*/
protected void notifyTransportListeners(int type, Address[] validSent,
Address[] validUnsent,
Address[] invalid, Message msg) {
if (transportListeners == null)
return;
TransportEvent e = new TransportEvent(this, type, validSent,
validUnsent, invalid, msg);
queueEvent(e, transportListeners);
}
}