Create an explicit heartbeat task with an experiration flag so that
it can be cancelled reliably vs relying on the ScheduledFutureTask
cancel method which may return true even if the task is already
running.
Issue: SPR-14356
Even before this change SockJS sessions always cancelled the heartbeat
task first prior to sending messages. However when the heartbeat task
is already in progress, cancellation of it is not enough and we must
wait until the heartbeat is sent.
This commit adds a heartbeat write lock which is obtained and held
during the sending of a heartbeat. Now when sessions send a message
they still cancel the heartbeat task but if that fails they also wait
for the heartbeat write lock.
Issue: SPR-14356
Previous refactoring (fcf6ae and also 43d937) in the SockJsSession
hierarchy consolidated access to the request and response in the
base class AbstractHttpSockJsSession in order to keep synchronization
concerns there. However that also unintentionally removed the call to
resetRequest() after sending a heartbeat for any of the
PollingSockJsSession classes. In general a polling session should call
resetRequest after every frame written.
This commit brings back the writeFrame override in PollingSockJsSession
with an extra call to resetRequest().
Issue: SPR-14107
Commit 48236b from 2014 introduced a logging improvement to avoid
logging each removed session per line and instead log one line at
the end with all removed sessions ids. However that list of removed
session ids wasn't populated. This commit fixes that.
Issue: SPR-14111
Before this commit the concurrent session wrapper mainly protected the
sending of messages. The close itself however may also cause a message
to be sent as is the case of the SockJS protocol.
This change protects the close and checks if the session has exceeded
send time or buffer limits in which case the close status is changed
to SESSION_NOT_RELIABLE (introduced in commit cbd5af3a) which in turn
signals that extra care should be exercised when closing the session.
Issue: SPR-13904
As of Tyrus 1.9, `TyrusEndpointWrapper`'s constructor has a new Boolean
argument (which is mandatory).
This commit reflectively chooses the right constructor method for Tyrus
1.9+ versions.
Issue: SPR-13566
