digraph G{

    subgraph cluster_1 {
        style=filled;
		color=lightgrey;
		node [style=filled,color=white];
        REQUESTED_NEW -> SCHEDULED_DEPLOY [label="assign_host()"];
        SCHEDULED_DEPLOY -> REQUESTED_START [label="create_vm()"];
        label="ucloud-scheduler";
    }
    
    subgraph cluster_2 {
        style=filled;
		color=lightgrey;
		node [style=filled,color=white];
        
        REQUESTED_START -> RUNNING [label="start_vm()"]
        RUNNING -> SUSPENDED [label="REQUESTED_SUSPEND"]
        RUNNING -> RUNNING [label="REQUESTED_RESUME"]
        RUNNING -> SHUTDOWN [label="REQUESTED_SHUTDOWN"]
        SUSPENDED -> RUNNING [label="REQUESTED_RESUME"]

    }

    subgraph cluster_3 {
        style=filled;
        color=lightgrey;

        SCHEDULED_DEPLOY -> REQUESTED_NEW [label="Host Died"]
        REQUESTED_START -> KILLED [label="Host Died"]
        RUNNING -> KILLED [label="Host Died OR VM Died"]
        SUSPENDED -> KILLED [label="VM Died"]
        SHUTDOWN -> SHUTDOWN [label="VM Died"]
        
        label="ucloud-vm & ucloud-scheduler";

    }    
    
}