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67 lines
2 KiB
Go
67 lines
2 KiB
Go
package queue
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//go:generate mockery -name Queue -output mock -case=underscore
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import (
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"errors"
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"golang.org/x/net/context"
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)
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// ErrNotFound indicates the requested work item does not
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// exist in the queue.
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var ErrNotFound = errors.New("queue item not found")
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type Queue interface {
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// Publish inserts work at the tail of this queue, waiting for
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// space to become available if the queue is full.
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Publish(*Work) error
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// Remove removes the specified work item from this queue,
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// if it is present.
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Remove(*Work) error
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// PullClose retrieves and removes the head of this queue,
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// waiting if necessary until work becomes available.
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Pull() *Work
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// PullClose retrieves and removes the head of this queue,
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// waiting if necessary until work becomes available. The
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// CloseNotifier should be provided to clone the channel
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// if the subscribing client terminates its connection.
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PullClose(CloseNotifier) *Work
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}
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// Publish inserts work at the tail of this queue, waiting for
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// space to become available if the queue is full.
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func Publish(c context.Context, w *Work) error {
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return FromContext(c).Publish(w)
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}
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// Remove removes the specified work item from this queue,
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// if it is present.
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func Remove(c context.Context, w *Work) error {
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return FromContext(c).Remove(w)
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}
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// Pull retrieves and removes the head of this queue,
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// waiting if necessary until work becomes available.
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func Pull(c context.Context) *Work {
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return FromContext(c).Pull()
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}
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// PullClose retrieves and removes the head of this queue,
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// waiting if necessary until work becomes available. The
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// CloseNotifier should be provided to clone the channel
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// if the subscribing client terminates its connection.
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func PullClose(c context.Context, cn CloseNotifier) *Work {
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return FromContext(c).PullClose(cn)
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}
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// CloseNotifier defines a datastructure that is capable of notifying
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// a subscriber when its connection is closed.
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type CloseNotifier interface {
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// CloseNotify returns a channel that receives a single value
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// when the client connection has gone away.
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CloseNotify() <-chan bool
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}
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