Adding support for auto detection of wire protocols over a transport.
OpenWire, AMQP, STOMP, and MQTT can all be detected and the broker
will properly handle each one over a given Transport. Currently
auto TCP, NIO, SSL, and NIO+SSL transports can handle auto-detection
of the wire format and client but support could be added in the
future for other transports like websockets.
The code that adds subscriptions for retroactive subscribers did not
account for the case where the last ack position in the ackLocations
table is used as a placeholder for the next incoming message and there
may not be an element in the messageReference tracker for that index
especially after restart when the index is reloaded. The code needed to
check this when it iterates of the existing message references to add a
value so to avoid the NPE.
Also cleaned up the MQTT tests such that they place their data dir in
./target so that old stores get removed on 'mvn clean'
Clean up the MQTT over WebSocket code to allow for handling link
stealing and inactivity monitor. Ensures that the web socket instances
get cleaned up on errors and avoids leaks that might otherwise arise.
Adds new tests for MQTT over WebSocket.
Adds some missing license headers as well.
Add better support for maxFrameSize configuration that fits with the
defaults configuration for the broker by allowing the maxFrameSize to be
configured via ?wireFormat.maxFrameSize on STOMP, AMQP, and MQTT.
Previously we only supported transport.wireFormat.maxFrameSize.
Don't dip into the store to recover durable topic subscriptions or queue
subscriptions depending on the subscription strategy in use. The needed
information is always kept in either TopicRegion or QueueRegion even
after restart as all stored destinations are reloaded as the broker is
started.
Add a connect check in the inactivity monitor to account for opened
connections that might drop but not be spotted, in the case where the
connect frame is lost this can lead to connections that aren't fully
opened and won't be cleaned up until the broker detects the socket has
failed.
By default the connection timer is set to 30 seconds, if no connect
frame is read by then the connection is dropped. The broker can be
configured via the 'transport.connectAttemptTimeout' URI option, a value
<= zero disable the check.
Adds a subscription strategy model where the default is the normal
durable topic subscription based approach or a strategy that maps all
subscriptions and publish operations to a Virtual Topic model. A
network of brokers can network the Queues instead of having the durable
topics subscriptions repaeted on each Broker.
Reduce memory overhead of the MQTT Protocol converter by not storing the
UTF8Buffer instances and instead simply store the needed String values.
We always access the String value anyway so all of the UTF8Buffer object
we store carry the overhead of both marshalled UTF-8 bytes and an
unmarshalled String object.
Christopher L. Shannon (cshannon)
gtully
Timothy Bish
Dejan Bosanac
Christian Posta
Dhiraj Bokde