package recipe

import "github.com/coreos/etcd/contrib/recipes"

Index

Variables 

var (
	ErrKeyExists      = errors.New("key already exists")
	ErrWaitMismatch   = errors.New("unexpected wait result")
	ErrTooManyClients = errors.New("too many clients")
	ErrNoWatcher      = errors.New("no watcher channel")
)

Functions

func WaitEvents 

func WaitEvents(c *clientv3.Client, key string, rev int64, evs []storagepb.Event_EventType) (*storagepb.Event, error)

WaitEvents waits on a key until it observes the given events and returns the final one.

func WaitPrefixEvents 

func WaitPrefixEvents(c *clientv3.Client, prefix string, rev int64, evs []storagepb.Event_EventType) (*storagepb.Event, error)

Types

type Barrier 

type Barrier struct {
	// contains filtered or unexported fields
}

Barrier creates a key in etcd to block processes, then deletes the key to release all blocked processes.

func NewBarrier 

func NewBarrier(client *v3.Client, key string) *Barrier

func (*Barrier) Hold 

func (b *Barrier) Hold() error

Hold creates the barrier key causing processes to block on Wait.

func (*Barrier) Release 

func (b *Barrier) Release() error

Release deletes the barrier key to unblock all waiting processes.

func (*Barrier) Wait 

func (b *Barrier) Wait() error

Wait blocks on the barrier key until it is deleted. If there is no key, Wait assumes Release has already been called and returns immediately.

type DoubleBarrier 

type DoubleBarrier struct {
	// contains filtered or unexported fields
}

DoubleBarrier blocks processes on Enter until an expected count enters, then blocks again on Leave until all processes have left.

func NewDoubleBarrier 

func NewDoubleBarrier(client *clientv3.Client, key string, count int) *DoubleBarrier

func (*DoubleBarrier) Enter 

func (b *DoubleBarrier) Enter() error

Enter waits for "count" processes to enter the barrier then returns

func (*DoubleBarrier) Leave 

func (b *DoubleBarrier) Leave() error

Leave waits for "count" processes to leave the barrier then returns

type EphemeralKV 

type EphemeralKV struct{ RemoteKV }

EphemeralKV is a new key associated with a session lease

func NewEphemeralKV 

func NewEphemeralKV(client *v3.Client, key, val string) (*EphemeralKV, error)

NewEphemeralKV creates a new key/value pair associated with a session lease

func NewUniqueEphemeralKV 

func NewUniqueEphemeralKV(client *v3.Client, prefix, val string) (ek *EphemeralKV, err error)

NewUniqueEphemeralKV creates a new unique key/value pair associated with a session lease

func NewUniqueEphemeralKey 

func NewUniqueEphemeralKey(client *v3.Client, prefix string) (*EphemeralKV, error)

NewUniqueEphemeralKey creates a new unique valueless key associated with a session lease

type PriorityQueue 

type PriorityQueue struct {
	// contains filtered or unexported fields
}

PriorityQueue implements a multi-reader, multi-writer distributed queue.

func NewPriorityQueue 

func NewPriorityQueue(client *v3.Client, key string) *PriorityQueue

NewPriorityQueue creates an etcd priority queue.

func (*PriorityQueue) Dequeue 

func (q *PriorityQueue) Dequeue() (string, error)

Dequeue returns Enqueue()'d items in FIFO order. If the queue is empty, Dequeue blocks until items are available.

func (*PriorityQueue) Enqueue 

func (q *PriorityQueue) Enqueue(val string, pr uint16) error

Enqueue puts a value into a queue with a given priority.

type Queue 

type Queue struct {
	// contains filtered or unexported fields
}

Queue implements a multi-reader, multi-writer distributed queue.

func NewQueue 

func NewQueue(client *v3.Client, keyPrefix string) *Queue

func (*Queue) Dequeue 

func (q *Queue) Dequeue() (string, error)

Dequeue returns Enqueue()'d elements in FIFO order. If the queue is empty, Dequeue blocks until elements are available.

func (*Queue) Enqueue 

func (q *Queue) Enqueue(val string) error

type RWMutex 

type RWMutex struct {
	// contains filtered or unexported fields
}

func NewRWMutex 

func NewRWMutex(client *v3.Client, key string) *RWMutex

func (*RWMutex) Lock 

func (rwm *RWMutex) Lock() error

func (*RWMutex) RLock 

func (rwm *RWMutex) RLock() error

func (*RWMutex) RUnlock 

func (rwm *RWMutex) RUnlock() error

func (*RWMutex) Unlock 

func (rwm *RWMutex) Unlock() error

type RemoteKV 

type RemoteKV struct {
	// contains filtered or unexported fields
}

Key is a key/revision pair created by the client and stored on etcd

func GetRemoteKV 

func GetRemoteKV(kv v3.KV, key string) (*RemoteKV, error)

func NewKV 

func NewKV(kv v3.KV, key, val string, leaseID v3.LeaseID) (*RemoteKV, error)

func NewKey 

func NewKey(kv v3.KV, key string, leaseID v3.LeaseID) (*RemoteKV, error)

func NewSequentialKV 

func NewSequentialKV(kv v3.KV, prefix, val string) (*RemoteKV, error)

NewSequentialKV allocates a new sequential key-value pair at <prefix>/nnnnn

func NewUniqueKV 

func NewUniqueKV(kv v3.KV, prefix string, val string, leaseID v3.LeaseID) (*RemoteKV, error)

func NewUniqueKey 

func NewUniqueKey(kv v3.KV, prefix string) (*RemoteKV, error)

func (*RemoteKV) Delete 

func (rk *RemoteKV) Delete() error

func (*RemoteKV) Key 

func (rk *RemoteKV) Key() string

func (*RemoteKV) Put 

func (rk *RemoteKV) Put(val string) error

func (*RemoteKV) Revision 

func (rk *RemoteKV) Revision() int64

func (*RemoteKV) Value 

func (rk *RemoteKV) Value() string

Source Files

barrier.go client.go double_barrier.go key.go priority_queue.go queue.go rwmutex.go watch.go

Version
v2.3.8+incompatible (latest)
Published
Feb 16, 2017
Platform
linux/amd64
Imports
8 packages
Last checked
4 hours ago –

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