mirror of
https://github.com/minio/minio.git
synced 2024-12-26 07:05:55 -05:00
86 lines
3.6 KiB
Go
86 lines
3.6 KiB
Go
// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
|
|
// Use of this source code is governed by the MIT license that can be
|
|
// found in the LICENSE file.
|
|
|
|
package notify
|
|
|
|
import "errors"
|
|
|
|
var (
|
|
errAlreadyWatched = errors.New("path is already watched")
|
|
errNotWatched = errors.New("path is not being watched")
|
|
errInvalidEventSet = errors.New("invalid event set provided")
|
|
)
|
|
|
|
// Watcher is a intermediate interface for wrapping inotify, ReadDirChangesW,
|
|
// FSEvents, kqueue and poller implementations.
|
|
//
|
|
// The watcher implementation is expected to do its own mapping between paths and
|
|
// create watchers if underlying event notification does not support it. For
|
|
// the ease of implementation it is guaranteed that paths provided via Watch and
|
|
// Unwatch methods are absolute and clean.
|
|
type watcher interface {
|
|
// Watch requests a watcher creation for the given path and given event set.
|
|
Watch(path string, event Event) error
|
|
|
|
// Unwatch requests a watcher deletion for the given path and given event set.
|
|
Unwatch(path string) error
|
|
|
|
// Rewatch provides a functionality for modifying existing watch-points, like
|
|
// expanding its event set.
|
|
//
|
|
// Rewatch modifies existing watch-point under for the given path. It passes
|
|
// the existing event set currently registered for the given path, and the
|
|
// new, requested event set.
|
|
//
|
|
// It is guaranteed that Tree will not pass to Rewatch zero value for any
|
|
// of its arguments. If old == new and watcher can be upgraded to
|
|
// recursiveWatcher interface, a watch for the corresponding path is expected
|
|
// to be changed from recursive to the non-recursive one.
|
|
Rewatch(path string, old, new Event) error
|
|
|
|
// Close unwatches all paths that are registered. When Close returns, it
|
|
// is expected it will report no more events.
|
|
Close() error
|
|
}
|
|
|
|
// RecursiveWatcher is an interface for a Watcher for those OS, which do support
|
|
// recursive watching over directories.
|
|
type recursiveWatcher interface {
|
|
RecursiveWatch(path string, event Event) error
|
|
|
|
// RecursiveUnwatch removes a recursive watch-point given by the path. For
|
|
// native recursive implementation there is no difference in functionality
|
|
// between Unwatch and RecursiveUnwatch, however for those platforms, that
|
|
// requires emulation for recursive watch-points, the implementation differs.
|
|
RecursiveUnwatch(path string) error
|
|
|
|
// RecursiveRewatcher provides a functionality for modifying and/or relocating
|
|
// existing recursive watch-points.
|
|
//
|
|
// To relocate a watch-point means to unwatch oldpath and set a watch-point on
|
|
// newpath.
|
|
//
|
|
// To modify a watch-point means either to expand or shrink its event set.
|
|
//
|
|
// Tree can want to either relocate, modify or relocate and modify a watch-point
|
|
// via single RecursiveRewatch call.
|
|
//
|
|
// If oldpath == newpath, the watch-point is expected to change its event set value
|
|
// from oldevent to newevent.
|
|
//
|
|
// If oldevent == newevent, the watch-point is expected to relocate from oldpath
|
|
// to the newpath.
|
|
//
|
|
// If oldpath != newpath and oldevent != newevent, the watch-point is expected
|
|
// to relocate from oldpath to the newpath first and then change its event set
|
|
// value from oldevent to the newevent. In other words the end result must be
|
|
// a watch-point set on newpath with newevent value of its event set.
|
|
//
|
|
// It is guaranteed that Tree will not pass to RecurisveRewatcha zero value
|
|
// for any of its arguments. If oldpath == newpath and oldevent == newevent,
|
|
// a watch for the corresponding path is expected to be changed for
|
|
// non-recursive to the recursive one.
|
|
RecursiveRewatch(oldpath, newpath string, oldevent, newevent Event) error
|
|
}
|