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KubeMQ Channel (Topic/Subject/Address/Destination) is a string-based representation of an endpoint or a target of a message.
The core functionality of KubeMQ messaging is sending and receiving messages.
Senders (publishers) can send one or many messages (stream) to one or many destinations (Channels). Sending a message does not require the set up of any predefined destination.
Receiver (subscribers/listeners) can receive messages from one or more senders on the same channel or a wildcards channel. Before a Receiver can receive any messages, a Subscription function is needed to register his interest in receiving messages from a senders designation.
A channel string can be formed from any UTF-8 characters with the following attributes:
- Case sensitive, FOO and foo are different channel names
- No white spaces allowed
- Cannot be Blank (
>are special characters for token hierarchies.
- Cannot start with
- Can begin with
*(for subscription receivers only)
- Unlimited hierarchies
Channels names can be separated by the
.symbol to create messaging stream hierarchies.
One level hierarchy:
orgare valid one level hierarchies.
org.departmentare valid two-level hierarchies.
N level hierarchies:
foo.bar.A.B.C.>is valid n (n=6) level hierarchies.
KubeMQ supports two wildcards,
>. Wildcards are used to subscribe to a group of channels’strings.
Matching a single token in any hierarchy
Matching one or more tokens at the tail of a channel
Here some cases of channel subscription patterns and which types of messages with channels are accepted and ignored.