com.sun.squawk.io.mailboxes
Class MailboxAddress

java.lang.Object
  com.sun.squawk.io.mailboxes.MailboxAddress

public final class MailboxAddress
extends Object

A MailboxAddress is a private reference to a remote Mailbox. It is a logical connection between a sender and a Mailbox. MailboxAddress are created by lookupMailbox(), which creates a new MailboxAddress each time called, or by receiving a reference to a MailboxAddress in an envelope. If several isolates want to send messages to the same Mailbox in another isolate, each will use a different MailboxAddress. Even within an isolate, it may be simpler to use different MailboxAddresses to the same Mailbox. Any attempt to call send() on a MailboxAddress to a Mailbox that is closed throws a MailboxClosedException.

Method Summary

void	close() Sends a close message to the corresponding Mailbox, explaining that no more messages will be sent via this MailboxAddress.
MailboxAddress	getReplyAddress() Get the reply address that was associated with this address during lookup.
boolean	isOpen() Returns true if close() was called, or a MailboxClosedException was thrown by send().
boolean	isOwner(Isolate anIsolate) Returns true if anIsolate is the owner of this address.
static MailboxAddress	lookupMailbox(String name, Mailbox replyMailbox) This method looks up a MailboxAddress that has been registered with the system, and implicitly opens the connection to the remote Mailbox.
void	send(Envelope env) Sends a message to the Mailbox.
String	toString() Returns a string representation of the object.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

close

public void close()

Sends a close message to the corresponding Mailbox, explaining that no more messages will be sent via this MailboxAddress. Also closes otherAddress if it's open, to eagerly break connections between isolates. Redundant closes on a Mailbox are ignored. Do NOT call while synchronized on "this". Can deadlock on otherAddress.close().

isOpen

public boolean isOpen()

Returns true if close() was called, or a MailboxClosedException was thrown by send(). Note - this is intentionally unsynchronized to avoid deadlock in close(), where we call otherAddress.close().

isOwner

public boolean isOwner(Isolate anIsolate)

Returns true if anIsolate is the owner of this address.

lookupMailbox

public static MailboxAddress lookupMailbox(String name,
                                           Mailbox replyMailbox)
                                    throws NoSuchMailboxException

This method looks up a MailboxAddress that has been registered with the system, and implicitly opens the connection to the remote Mailbox. It also opens the reply address for the remote mailbox, so it may send responses back to this Isolate.

Parameters:

name - the name of the Mailbox to lookup.

replyAddress - the address of a local mailbox that the remote isolate can send replies to.

Returns:

an open address to the remote mailbox named name.

Throws:

NoSuchMailboxException - if there is no mailbox named name.

send

public void send(Envelope env)
          throws AddressClosedException

Sends a message to the Mailbox. Does not wait for acknowledgment. The MailboxAddress must have been opened by #lookup, must not have been closed, and caller must by the owning isolate of this MailboxAddress, or an IllegateStateException will be thrown.

Parameters:

env - the message to send

Throws:

IllegateStateException - if the address is not in the open state, or if the caller is not the "owner" of this MailboxAddress.

AddressClosedException

getReplyAddress

public MailboxAddress getReplyAddress()

Get the reply address that was associated with this address during lookup. The returned reply address may already be closed.

Returns:

the reply address for this address

Throws:

IllegalStateException - if this address is not open

toString

public String toString()

Description copied from class: Object

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Overrides:

toString in class Object

Returns:

a string representation of the object.