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  * Copyright 2014 dc-square GmbH
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This callback gets called when a CONNECT message arrives and is meant to perform the authentication of a client.

When more OnAuthenticationCallbacks are added only one must return a positive result to successfully authenticate the client.

If an com.dcsquare.hivemq.spi.callback.exception.AuthenticationException is thrown, no additional credentials checks in other plugins are made and the client is disconnected immediately with an CONNACK with the given return code.

Note: It's your responsibility to use proper caching in the checkCredentials method

Christian Goetz
public interface OnAuthenticationCallback extends SynchronousCallback {

Checks the credentials after a CONNECT message arrives.

return true when the authentication with the credentials was successful, false otherwise

clientData the client credentials
true when the authentication was successful
com.dcsquare.hivemq.spi.callback.exception.AuthenticationException when you want the client to disconnect immediately with a given return code
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