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package memberlist
// Delegate is the interface that clients must implement if they want to hook
// into the gossip layer of Memberlist. All the methods must be thread-safe,
// as they can and generally will be called concurrently.
type Delegate interface {
// NodeMeta is used to retrieve meta-data about the current node
// when broadcasting an alive message. It's length is limited to
// the given byte size. This metadata is available in the Node structure.
NodeMeta(limit int) []byte
// NotifyMsg is called when a user-data message is received.
// Care should be taken that this method does not block, since doing
// so would block the entire UDP packet receive loop. Additionally, the byte
// slice may be modified after the call returns, so it should be copied if needed
NotifyMsg([]byte)
// GetBroadcasts is called when user data messages can be broadcast.
// It can return a list of buffers to send. Each buffer should assume an
// overhead as provided with a limit on the total byte size allowed.
// The total byte size of the resulting data to send must not exceed
// the limit. Care should be taken that this method does not block,
// since doing so would block the entire UDP packet receive loop.
GetBroadcasts(overhead, limit int) [][]byte
// LocalState is used for a TCP Push/Pull. This is sent to
// the remote side in addition to the membership information. Any
// data can be sent here. See MergeRemoteState as well. The `join`
// boolean indicates this is for a join instead of a push/pull.
LocalState(join bool) []byte
// MergeRemoteState is invoked after a TCP Push/Pull. This is the
// state received from the remote side and is the result of the
// remote side's LocalState call. The 'join'
// boolean indicates this is for a join instead of a push/pull.
MergeRemoteState(buf []byte, join bool)
}
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