Java 类org.jivesoftware.smack.sm.packet.StreamManagement.Resume 实例源码

@Override
protected synchronized void loginNonAnonymously(String username, String password, String resource) throws XMPPException, SmackException, IOException {
    if (saslAuthentication.hasNonAnonymousAuthentication()) {
        // Authenticate using SASL
        if (password != null) {
            saslAuthentication.authenticate(username, password, resource);
        }
        else {
            saslAuthentication.authenticate(resource, config.getCallbackHandler());
        }
    } else {
        throw new SmackException("No non-anonymous SASL authentication mechanism available");
    }

    // If compression is enabled then request the server to use stream compression. XEP-170
    // recommends to perform stream compression before resource binding.
    if (config.isCompressionEnabled()) {
        useCompression();
    }

    if (isSmResumptionPossible()) {
        smResumedSyncPoint.sendAndWaitForResponse(new Resume(clientHandledStanzasCount, smSessionId));
        if (smResumedSyncPoint.wasSuccessful()) {
            // We successfully resumed the stream, be done here
            afterSuccessfulLogin(true);
            return;
        }
        // SM resumption failed, what Smack does here is to report success of
        // lastFeaturesReceived in case of sm resumption was answered with 'failed' so that
        // normal resource binding can be tried.
        LOGGER.fine("Stream resumption failed, continuing with normal stream establishment process");
    }

    bindResourceAndEstablishSession(resource);

    List<Stanza> previouslyUnackedStanzas = new LinkedList<Stanza>();
    if (unacknowledgedStanzas != null) {
        // 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.
        dropSmState();
    }
    if (isSmAvailable() && useSm) {
        // Remove what is maybe left from previously stream managed sessions
        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.
        smEnabledSyncPoint.sendAndWaitForResponseOrThrow(new Enable(useSmResumption, smClientMaxResumptionTime));
        synchronized (requestAckPredicates) {
            if (requestAckPredicates.isEmpty()) {
                // Assure that we have at lest one predicate set up that so that we request acks
                // for the server and eventually flush some stanzas from the unacknowledged
                // stanza queue
                requestAckPredicates.add(Predicate.forMessagesOrAfter5Stanzas());
            }
        }
    }
    // (Re-)send the stanzas *after* we tried to enable SM
    for (Stanza stanza : previouslyUnackedStanzas) {
        sendStanzaInternal(stanza);
    }

    afterSuccessfulLogin(false);
}

@Override
protected synchronized void loginInternal(String username, String password, Resourcepart resource) throws XMPPException,
                SmackException, IOException, InterruptedException {
    // Authenticate using SASL
    SSLSession sslSession = secureSocket != null ? secureSocket.getSession() : null;
    saslAuthentication.authenticate(username, password, config.getAuthzid(), sslSession);

    // If compression is enabled then request the server to use stream compression. XEP-170
    // recommends to perform stream compression before resource binding.
    maybeEnableCompression();

    if (isSmResumptionPossible()) {
        smResumedSyncPoint.sendAndWaitForResponse(new Resume(clientHandledStanzasCount, smSessionId));
        if (smResumedSyncPoint.wasSuccessful()) {
            // We successfully resumed the stream, be done here
            afterSuccessfulLogin(true);
            return;
        }
        // SM resumption failed, what Smack does here is to report success of
        // lastFeaturesReceived in case of sm resumption was answered with 'failed' so that
        // normal resource binding can be tried.
        LOGGER.fine("Stream resumption failed, continuing with normal stream establishment process");
    }

    List<Stanza> previouslyUnackedStanzas = new LinkedList<Stanza>();
    if (unacknowledgedStanzas != null) {
        // 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.
        dropSmState();
    }

    // Now bind the resource. It is important to do this *after* we dropped an eventually
    // existing Stream Management state. As otherwise <bind/> and <session/> may end up in
    // unacknowledgedStanzas and become duplicated on reconnect. See SMACK-706.
    bindResourceAndEstablishSession(resource);

    if (isSmAvailable() && useSm) {
        // Remove what is maybe left from previously stream managed sessions
        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.
        smEnabledSyncPoint.sendAndWaitForResponseOrThrow(new Enable(useSmResumption, smClientMaxResumptionTime));
        synchronized (requestAckPredicates) {
            if (requestAckPredicates.isEmpty()) {
                // Assure that we have at lest one predicate set up that so that we request acks
                // for the server and eventually flush some stanzas from the unacknowledged
                // stanza queue
                requestAckPredicates.add(Predicate.forMessagesOrAfter5Stanzas());
            }
        }
    }
    // (Re-)send the stanzas *after* we tried to enable SM
    for (Stanza stanza : previouslyUnackedStanzas) {
        sendStanzaInternal(stanza);
    }

    afterSuccessfulLogin(false);
}