Chapter 10. Dynamic Discovery Protocol


Abstract

The dynamic discovery protocol combines reconnect logic with a discovery agent to dynamically create a list of brokers to which the client can connect.

URI syntax

Example 10.1, “Dynamic Discovery URI” shows the syntax for a discovery URI.

Example 10.1. Dynamic 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 Chapter 12, Discovery Agents.
The options, ?Options, are specified in the form of a query list. The discovery options are described in Table 10.1, “Dynamic Discovery Protocol Options”. You can also inject transport options into the discovered transports by adding their properties to the list.
Note
If no options are required, you can drop the parentheses from the URI. The resulting URI would take the form discovery:DiscoveryAgentUri

Transport options

The discovery protocol supports the options described in Table 10.1, “Dynamic Discovery Protocol Options”.
Table 10.1. Dynamic Discovery Protocol Options
OptionDefaultDescription
initialReconnectDelay 10Specifies, in milliseconds, how long to wait before the first reconnect attempt.
maxReconnectDelay 30000Specifies, in milliseconds, the maximum amount of time to wait between reconnect attempts.
useExponentialBackOff trueSpecifies if an exponential back-off is used between reconnect attempts.
backOffMultiplier 2Specifies the exponent used in the exponential back-off algorithm.
maxReconnectAttempts 0Specifies the maximum number of reconnect attempts before an error is sent back to the client. 0 specifies unlimited attempts.
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