Update SSHClient to interrupt KeepAlive Thread when disconnecting #752
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…ierynomus#506) - Changed KeepAlive.setKeepAliveInterval() to avoid starting Thread - Updated SSHClient.onConnect() to start KeepAlive Thread when enabled - Updated SSHClient.disconnect() to interrupt KeepAlive Thread - Updated KeepAliveThreadTerminationTest to verify state of KeepAlive Thread
hierynomus
approved these changes
Dec 22, 2021
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The current
KeepAlive.setKeepAliveInterval()method starts the Thread when invoked with an interval greater than zero. This behavior starts the KeepAlive Thread prior to establishing a connection, depending on when the caller invokessetKeepAliveInterval().Neither the
ConnectionImplclass nor theSSHClientclass interrupt the KeepAlive Thread, resulting in continued looping inside ofKeepAlive.run()even after disconnecting and closingSSHClientas described in issue #506.This pull request changes the behavior of
KeepAlive.setKeepAliveInterval()to avoid starting the Thread. TheSSHClient.onConnect()method checks whether the KeepAlive Thread is enabled and then callsstart()to avoid unnecessary execution prior to a successful connection. TheSSHClient.disconnect()method interrupts the KeepAlive Thread to ensure that it does not continue running. TheKeepAliveThreadTerminationTestincludes an additional method to verify the initial state of the KeepAlive Thread, as well as the state after connecting and disconnecting.