state

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Published: Mar 21, 2020 License: Apache-2.0 Imports: 4 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func Matcher

func Matcher(specifiers ...api.Event) events.MatcherFunc

Matcher returns an events.Matcher that Matches the specifiers with OR logic.

func NodeCheckState

func NodeCheckState(n1, n2 *api.Node) bool

NodeCheckState is a NodeCheckFunc for matching node state.

func TaskCheckStateGreaterThan

func TaskCheckStateGreaterThan(t1, t2 *api.Task) bool

TaskCheckStateGreaterThan is a TaskCheckFunc for checking task state.

func Watch

func Watch(queue *watch.Queue, specifiers ...api.Event) (eventq chan events.Event, cancel func())

Watch takes a variable number of events to match against. The subscriber will receive events that match any of the arguments passed to Watch.

Examples:

// subscribe to all events Watch(q)

// subscribe to all UpdateTask events Watch(q, EventUpdateTask{})

// subscribe to all task-related events Watch(q, EventUpdateTask{}, EventCreateTask{}, EventDeleteTask{})

// subscribe to UpdateTask for node 123 Watch(q, EventUpdateTask{Task: &api.Task{NodeID: 123},

Checks: []TaskCheckFunc{TaskCheckNodeID}})

// subscribe to UpdateTask for node 123, as well as CreateTask // for node 123 that also has ServiceID set to "abc" Watch(q, EventUpdateTask{Task: &api.Task{NodeID: 123},

                Checks: []TaskCheckFunc{TaskCheckNodeID}},
EventCreateTask{Task: &api.Task{NodeID: 123, ServiceID: "abc"},
                Checks: []TaskCheckFunc{TaskCheckNodeID,
                                        func(t1, t2 *api.Task) bool {
                                                return t1.ServiceID == t2.ServiceID
                                        }}})

Types

type Change

type Change struct {
	StoreActions []api.StoreAction
	Version      api.Version
}

A Change includes a version number and a set of store actions from a particular log entry.

type EventCommit

type EventCommit struct {
	Version *api.Version
}

EventCommit delineates a transaction boundary.

func (EventCommit) Matches

func (e EventCommit) Matches(watchEvent events.Event) bool

Matches returns true if this event is a commit event.

type Proposer

type Proposer interface {
	// ProposeValue adds storeAction to the distributed log. If this
	// completes successfully, ProposeValue calls cb to commit the
	// proposed changes. The callback is necessary for the Proposer to make
	// sure that the changes are committed before it interacts further
	// with the store.
	ProposeValue(ctx context.Context, storeAction []api.StoreAction, cb func()) error
	// GetVersion returns the monotonic index of the most recent item in
	// the distributed log.
	GetVersion() *api.Version
	// ChangesBetween returns the changes starting after "from", up to and
	// including "to". If these changes are not available because the log
	// has been compacted, an error will be returned.
	ChangesBetween(from, to api.Version) ([]Change, error)
}

A Proposer can propose actions to a cluster.

Directories

Path Synopsis
transport
Package transport provides grpc transport layer for raft.
Package transport provides grpc transport layer for raft.
Package store provides interfaces to work with swarm cluster state.
Package store provides interfaces to work with swarm cluster state.

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