Return a negative integer, zero, or a positive integer if this object is less than, equal to, or greater than the specified object:
this < that => <0
this == that => 0
this > that => >0
This method may also be accessed via the <
<=
<=>
>=
and >
shortcut operators. If not overridden the default
implementation compares the toStr
representations. Also see docLang.
Examples:
3.compare(8) => -1
8.compare(3) => 1
8.compare(8) => 0
3 <=> 8 => -1 // shortcut for 3.compare(8)
Compare this object to the specified for equality. This
method may be accessed via the == and != shortcut operators.
If not overridden the default implementation compares for
reference equality using the === operator. If this method
is overridden, then hash() must also be overridden such that
any two objects which return true for equals() must return
the same value for hash(). This method must accept null
and
return false.
Return a unique hashcode for this object. If a class overrides hash() then it must ensure if equals() returns true for any two objects then they have same hash code.
Set the explicit subscription listener to use for this subscription. This will permanently invalidate any calls to the convenience methods onSubscribe, onMessage, and onUnsubscribe.
If true, application messages will not be forwareded to a connection with a clientID equal to the clientID of the publishing connection. Cannot be set on a shared subscription. (MQTT 5 only)
Set the callback to be invoked when a message is published to this subscription.
Set the callback to be invoked when the subscription is acknowledged.
Set the callback to be invoked after the subscription is unsubscribed.
Request maximum QoS 0
Request maximum QoS 1
Request maximum QoS 2
If true, application messages forwared using this subscription keep the RETAIN flag they were published with. If false, application messages forwarded using this subscription have the RETAIN flag set to 0 (false). (MQTT 5 only)
This option specifies whether retained are sent when the subscription is established. (MQTT 5 only)
Build and send the subscribe packet. A future is returned
that will be completed when the SUBACK
is received.
Get an immutable representation of this instance or throw NotImmutableErr if this object cannot be represented as an immutable:
Set the topic filter to subscribe to. You must set a topic filter before you call send.
Return a string representation of this object.
Trap a dynamic call for handling. Dynamic calls are invoked with the -> shortcut operator:
a->x a.trap("x", null)
a->x() a.trap("x", null)
a->x = b a.trap("x", [b])
a->x(b) a.trap("x", [b])
a->x(b, c) a.trap("x", [b, c])
The default implementation provided by Obj attempts to use reflection. If name maps to a method, it is invoked with the specified arguments. If name maps to a field and args.size is zero, get the field. If name maps to a field and args.size is one, set the field and return args[0]. Otherwise throw UnknownSlotErr.
This method called whenever an it-block is applied to an
object. The default implementation calls the function with this
,
and then returns this
.
Static
echoWrite x.toStr
to standard output followed by newline. If x
is null then print "null". If no argument is provided then
print an empty line.
Optional
x: JsObj
Utility to build a subscribe request for a single topic and then send it.
By default, the following settings are enabled:
send