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Fix counting bug Stream Management implementation

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Previously Smack would put messages in the unacknowledgedStanzas queue
after it received the 'enabled' element, when it should do so right
after sending the 'enable' stream element.

Imagine a session where '-->' denotes "received from server" and '<--'
"sent to server"

<-- enable
--> iq roster push set
--> presence some presence
<-- iq roster push result
--> enabled

then Smack would not add the iq roster push result stanza to the
unacknowledgedStanzas queue.

This fixes the issue by initializing the unacknowledgedStanzas queue
when the writer thread encounters a 'Enable' stream element.

The additional 'instanceof' invocation in the writer thread should not
be a big performance issue, since the existing "instanceof Stanza" check
should be the common case and the "instanceof Enable" is an exclusive
alternative to this case.
This commit is contained in:
Florian Schmaus 2015-03-02 15:12:19 +01:00
parent dde0cfd7f6
commit 96bb37f924
1 changed files with 13 additions and 2 deletions
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15
smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java
View file

@ -397,10 +397,15 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
// There was a previous connection with SM enabled but that was either not resumable or
// failed to resume. Make sure that we (re-)send the unacknowledged stanzas.
unacknowledgedStanzas.drainTo(previouslyUnackedStanzas);
// Reset unacknowledged stanzas to 'null' to signal that we never send 'enable' in this
// XMPP session (There maybe was an enabled in a previous XMPP session of this
// connection instance though). This is used in writePackets to decide if stanzas should
// be added to the unacknowledged stanzas queue, because they have to be added right
// after the 'enable' stream element has been sent.
unacknowledgedStanzas = null;
}
if (isSmAvailable() && useSm) {
// Remove what is maybe left from previously stream managed sessions
unacknowledgedStanzas = new ArrayBlockingQueue<Stanza>(QUEUE_SIZE);
serverHandledStanzasCount = 0;
// XEP-198 3. Enabling Stream Management. If the server response to 'Enable' is 'Failed'
// then this is a non recoverable error and we therefore throw an exception.
@ -1330,11 +1335,17 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
if (element instanceof Stanza) {
packet = (Stanza) element;
}
else if (element instanceof Enable) {
// The client needs to add messages to the unacknowledged stanzas queue
// right after it sent 'enabled'. Stanza will be added once
// unacknowledgedStanzas is not null.
unacknowledgedStanzas = new ArrayBlockingQueue<>(QUEUE_SIZE);
}
// Check if the stream element should be put to the unacknowledgedStanza
// queue. Note that we can not do the put() in sendPacketInternal() and the
// packet order is not stable at this point (sendPacketInternal() can be
// called concurrently).
if (isSmEnabled() && packet != null) {
if (unacknowledgedStanzas != null && packet != null) {
// If the unacknowledgedStanza queue is nearly full, request an new ack
// from the server in order to drain it
if (unacknowledgedStanzas.size() == 0.8 * XMPPTCPConnection.QUEUE_SIZE) {