To ensure the thread starting the reader/writer threads sees them
running and eventually waits until the 'running' boolean is reset to
'false' upon connection termination.
Since the current variant of notifyConnectionError() does not execute
most of its work in a new thread, especially since instantShutdown()
is called in the invoking thread, we have to mark the connections
reader or writer threads as no longer running prior them invoking
notifyConnectionError(). Otherwise they will end up waiting for
themselves to terminate.
To make it clear that this will either return if the condition is
true *or* if a connection exception happened.
Also introduce waitFor(), which is deliberately not named
waitForCondition() because it carries a different semantic.
This continues the design started with e98d42790 ("SmackReactor/NIO,
Java8/Android19, Pretty print XML, FSM connections"), where the
exceptions that caused an operation to fail, are not recorded within
SynchronizationPoint but within the connection instance itself.
This moves the logic in AbstractXMPPConnection.getSmackTlsContext()
into the ConnectionConfiguration constructor.
Also introduce SslContextFactory and use it in
ConnectionConfiguration.
This is a complete redesign of what was previously
XmppNioTcpConnection. The new architecture allows to extend an XMPP
client to server (c2s) connection with new transport bindings and
other extensions.
Besides the way the transport handles the stream after SASL
<success/>, the SASL logic is independend from the underlying
transport (BOSH, TCP, …). Hence move it up into
AbstractXMPPConnection.
This also has the benefit that we can make some more methods private
or package-private.
Also introduce XmlStringBuilder.optTextChild(), which causes some
associated changes.
This is based on the patch provided by Georg Lukas, modified to take
XMPP domain names that can not be represented as DNS names into
account. See c42d2eea24 (r269250137)
Fixes SMACK-870.
Introducing Smack's own XmlPullParser interface which tries to stay as
compatible as possible to XPP3. The interface is used to either wrap
StAX's XMLStreamReader if Smack is used on Java SE, and XPP3's
XmlPullParser if Smack is used on on Android.
Fixes SMACK-591.
Also introduce JUnit 5 and non-strict javadoc projects.
and also call notifyConnectionError() on exception thrown by
openStream().
In hindsight I wonder why openStream() was ever called in the writer
thread, as it only caused unnecessary synchronization overhead, as can
be seen by the initialOpenStreamSend synchronization point.
In case an exception happens in connect()/login() the
'disconnectedButResumable' boolean may (still) be set. Which causes
only one of the reader and writer threads to exit, typically the
reader thread, because shutdown() will bail out very early. This
leaves a dangling (writer) thread causing memory leaks and deadlocks
on a subsequent connect()/login().
as it is not neccessary and causes stalls and deadlocks with a
concurrent connect()/login() (which could be resolved interrupting the
connect()/login() calling thread):
"Smack Reader (0)" daemon prio=5 tid=21 Blocked
| group="main" sCount=1 dsCount=0 obj=0x12c84670 self=0x7e072ca200
| sysTid=14965 nice=0 cgrp=default sched=0/0 handle=0x7e06155450
| state=S schedstat=( 63430626 3034269 21 ) utm=5 stm=0 core=2 HZ=100
| stack=0x7e06053000-0x7e06055000 stackSize=1037KB
| held mutexes=
at org.jivesoftware.smack.tcp.XMPPTCPConnection.notifyConnectionError(XMPPTCPConnection.java:-1)
- waiting to lock <0x0ec6e6bb> (a org.jivesoftware.smack.tcp.XMPPTCPConnection) held by thread 22
at org.jivesoftware.smack.tcp.XMPPTCPConnection.access$3900(XMPPTCPConnection.java:154)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1330)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$900(XMPPTCPConnection.java:1064)
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnection.java:1081)
at java.lang.Thread.run(Thread.java:761)
"connect" prio=5 tid=22 Waiting
| group="main" sCount=1 dsCount=0 obj=0x12c8e820 self=0x7e19bcd600
| sysTid=15047 nice=0 cgrp=default sched=0/0 handle=0x7e05ee4450
| state=S schedstat=( 14067083 7475835 14 ) utm=1 stm=0 core=0 HZ=100
| stack=0x7e05de2000-0x7e05de4000 stackSize=1037KB
| held mutexes=
at java.lang.Object.wait!(Native method)
- waiting on <0x0c058b14> (a java.lang.Object)
at java.lang.Thread.parkFor$(Thread.java:2127)
- locked <0x0c058b14> (a java.lang.Object)
at sun.misc.Unsafe.park(Unsafe.java:325)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:840)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
at java.util.concurrent.Semaphore.acquire(Semaphore.java:446)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.initConnection(XMPPTCPConnection.java:685)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectInternal(XMPPTCPConnection.java:942)
at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.java:417)
- locked <0x0ec6e6bb> (a org.jivesoftware.smack.tcp.XMPPTCPConnection)
at org.yaxim.androidclient.service.SmackableImp.connectAndLogin(SmackableImp.java:717)
- locked <0x0ec6e6bb> (a org.jivesoftware.smack.tcp.XMPPTCPConnection)
at org.yaxim.androidclient.service.SmackableImp.doConnect(SmackableImp.java:304)
at org.yaxim.androidclient.service.SmackableImp$5.run(SmackableImp.java:391)
