public void Test_Backup_Found_Primary()
{
StateChanged<InstanceState> stateChanged = null;
var observer = new MockStateObserver(s => stateChanged = s, Assert.IsNull);
InstanceState localState;
ClusterStateMachine machine = CreateClusterStateMachine(observer, NodeRole.Backup, out localState);
var remoteState = new NodeState { Role = NodeRole.Primary, Status = NodeStatus.Connecting };
machine.RaiseEvent(localState, machine.PartnerStatusReceived, remoteState);
Assert.AreEqual("Connecting", stateChanged.Previous.Name);
Assert.AreEqual("Passive", stateChanged.Current.Name);
}
public void Test_LostPartner_During_Any_Should_LogException()
{
StateChanged<InstanceState> stateChanged = null;
var observer = new MockStateObserver(s => stateChanged = s, Assert.IsNull);
InstanceState localState;
ClusterException cex = null;
ClusterStateMachine machine = CreateClusterStateMachine(observer, NodeRole.Primary, out localState,
ex => cex = ex);
var remoteState = new NodeState { Role = NodeRole.Backup, Status = NodeStatus.Passive };
machine.RaiseEvent(localState, machine.PartnerStatusReceived, remoteState);
machine.RaiseEvent(localState, machine.LostPartner, localState);
Assert.AreEqual(ClusterFailureReason.LostPartner, cex.Reason);
Assert.AreEqual("Connecting", stateChanged.Previous.Name);
Assert.AreEqual("Active", stateChanged.Current.Name);
}
public void Test_InvalidTopology()
{
StateChanged<InstanceState> stateChanged = null;
var observer = new MockStateObserver(s => stateChanged = s, Assert.IsNull);
InstanceState localState;
ClusterException cex = null;
ClusterStateMachine machine = CreateClusterStateMachine(observer, NodeRole.Primary, out localState,
ex => cex = ex);
var remoteState = new NodeState { Role = NodeRole.Primary, Status = NodeStatus.Connecting };
machine.RaiseEvent(localState, machine.PartnerStatusReceived, remoteState);
Assert.AreEqual(ClusterFailureReason.InvalidTopology, cex.Reason);
Assert.AreEqual("Stopped", stateChanged.Previous.Name);
Assert.AreEqual("Final", stateChanged.Current.Name);
machine = CreateClusterStateMachine(observer, NodeRole.Backup, out localState, ex => cex = ex);
remoteState = new NodeState { Role = NodeRole.Backup, Status = NodeStatus.Connecting };
machine.RaiseEvent(localState, machine.PartnerStatusReceived, remoteState);
Assert.AreEqual(ClusterFailureReason.InvalidTopology, cex.Reason);
Assert.AreEqual("Stopped", stateChanged.Previous.Name);
Assert.AreEqual("Final", stateChanged.Current.Name);
}
public void Test_SplitBrain_Backup()
{
StateChanged<InstanceState> stateChanged = null;
var observer = new MockStateObserver(s => stateChanged = s, Assert.IsNull);
InstanceState localState;
ClusterException cex = null;
ClusterStateMachine machine = CreateClusterStateMachine(observer, NodeRole.Backup, out localState,
ex => cex = ex);
var newState = new InstanceState
{
CurrentState = machine.Active,
Role = NodeRole.Backup,
Status = NodeStatus.Active
};
machine.TransitionToState(newState, machine.Active);
var remoteState = new NodeState { Role = NodeRole.Primary, Status = NodeStatus.Active };
machine.RaiseEvent(newState, machine.PartnerStatusReceived, remoteState);
Assert.AreEqual(ClusterFailureReason.SplitBrain, cex.Reason);
Assert.AreEqual("Stopped", stateChanged.Previous.Name);
Assert.AreEqual("Final", stateChanged.Current.Name);
}
public ClusterException(ClusterFailureReason reason, NodeState localState, NodeState remoteState)
: this(reason)
{
LocalState = localState;
RemoteState = remoteState;
}
