cluster

const (
	// master
	// the cluster master is responsible for managing garbage collection for both nodes and plugins.
	// typically, each node handles the garbage collection for its own plugins
	// However, if a node becomes inactive, the master takes over this task.
	// every node has an equal chance of becoming the master.
	// once a node is selected as the master, it is locked in that role.
	// If the master node becomes inactive, the master slot is released, allowing other nodes to attempt to take over the role.
	MASTER_LOCKING_INTERVAL  = time.Millisecond * 500 // interval to try to lock the slot to be the master
	MASTER_LOCK_EXPIRED_TIME = time.Second * 2        // expired time of master key
	MASTER_GC_INTERVAL       = time.Second * 10       // interval to do garbage collection of nodes has already deactivated

	// node
	// To determine the available IPs of the nodes, each node will vote for the IPs of other nodes.
	// this voting process will occur every $NODE_VOTE_INTERVAL.
	// simultaneously, all nodes will synchronize to the latest status in memory every $UPDATE_NODE_STATUS_INTERVAL.
	// each node will also update its own status to remain active. If a node becomes inactive, it will be removed from the cluster.
	NODE_VOTE_INTERVAL          = time.Second * 30 // interval to vote the ips of the nodes
	UPDATE_NODE_STATUS_INTERVAL = time.Second * 5  // interval to update the status of the node
	NODE_DISCONNECTED_TIMEOUT   = time.Second * 10 // once a node is no longer active, it will be removed from the cluster

	// plugin scheduler
	// each node will schedule its plugins every $PLUGIN_SCHEDULER_INTERVAL time
	// and schedule process will be triggered every $PLUGIN_SCHEDULER_TICKER_INTERVAL time
	// not all the plugins will be scheduled every time, only the plugins that are not scheduled in $PLUGIN_SCHEDULER_INTERVAL time will be scheduled
	// and the plugins that are not active will be removed from the cluster
	PLUGIN_SCHEDULER_TICKER_INTERVAL = time.Second * 3  // interval to schedule the plugins
	PLUGIN_SCHEDULER_INTERVAL        = time.Second * 10 // interval to schedule the plugins
	PLUGIN_DEACTIVATED_TIMEOUT       = time.Second * 30 // once a plugin is no longer active, it will be removed from the cluster
)

const (
	CLUSTER_STATUS_HASH_MAP_KEY = "cluster-nodes-status-hash-map"
	PREEMPTION_LOCK_KEY         = "cluster-master-preemption-lock"
)

const (
	CLUSTER_NEW_NODE_CHANNEL = "cluster-new-node-channel"
)

const (
	CLUSTER_UPDATE_NODE_STATUS_LOCK_PREFIX = "cluster-update-node-status-lock"
)

const (
	PLUGIN_STATE_MAP_KEY = "plugin_state"
)