The dynamic discovery protocol combines reconnect logic with a discovery agent to dynamically create a list of brokers to which the client can connect. The discovery protocol invokes a discovery agent in order to build up a list of broker URIs. The protocol then randomly chooses a URI from the list and attempts to establish a connection to it. If it does not succeed, or if the connection subsequently fails, a new connection is established to one of the other URIs in the list.

Example 8.10 shows the syntax for a discovery URI.

discovery://(DiscoveryAgentUri)?Options

DiscoveryAgentUri is URI for the discovery agent used to build up the list of available brokers. Discovery agents are described in Discovery Agents.

The options, ?Options, are specified in the form of a query list. The discovery options are described in Table 8.1. You can also inject transport options as described in Setting options on the discovered transports.

	Tip
	If no options are required, you can drop the parentheses from the URI. The resulting URI would take the form discovery://DiscoveryAgentUri

The discovery protocol supports the options described in Table 8.1.

Example 8.11 shows a discovery URI that uses a multicast discovery agent.

discovery://(multicast://default)?initialReconnectDelay=100

The list of transport options, Options, in the discovery URI can also be used to set options on the discovered transports. If you set an option not listed in Setting options on the discovered transports, the URI parser attempts to inject the option setting into every one of the discovered endpoints.

Example 8.12 shows a discovery URI that sets the TCP connectionTimeout option to 10 seconds.

discovery://(multicast://default)?connectionTimeout=10000