The Client class contains a disconnect handler and other features for building highly-available applications. The Client includes features for managing a list of failover servers, resuming subscriptions, republishing in-flight messages, and other functionality that is commonly needed for high availability. 60East recommends using the Client for automatic reconnection wherever possible, as the disconnect handler has been carefully crafted to handle a wide variety of edge cases and potential failures.
If an application needs to reconnect or fail over, use a Client with a ServerChooser set, and the AMPS client library will automatically handle failover and reconnection. You control which servers the client fails over to by implementing the ServerChooser and you can control the timing of the failover by using one of the provided ReconnectDelayStrategy classes or implementing your own.
For most applications, the combination of the provided Client disconnect handler and a ConnectionStateListener gives you the ability to monitor disconnections and add custom behavior at the appropriate point in the reconnection process.
If you need to add custom behavior to the failover (such as logging, resetting an internal cache, refreshing credentials and so on), the ConnectionStateListener class allows your application to be notified and take action when disconnection is detected and at each stage of the reconnection process.
To extend the behavior of the AMPS client during reconnection, implement a ConnectionStateListener.