mirror of https://github.com/status-im/op-geth.git
41 lines
1.9 KiB
Go
41 lines
1.9 KiB
Go
// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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// Package notify implements access to filesystem events.
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//
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// Notify is a high-level abstraction over filesystem watchers like inotify,
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// kqueue, FSEvents, FEN or ReadDirectoryChangesW. Watcher implementations are
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// split into two groups: ones that natively support recursive notifications
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// (FSEvents and ReadDirectoryChangesW) and ones that do not (inotify, kqueue, FEN).
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// For more details see watcher and recursiveWatcher interfaces in watcher.go
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// source file.
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//
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// On top of filesystem watchers notify maintains a watchpoint tree, which provides
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// strategy for creating and closing filesystem watches and dispatching filesystem
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// events to user channels.
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//
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// An event set is just an event list joint using bitwise OR operator
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// into a single event value.
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//
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// A filesystem watch or just a watch is platform-specific entity which represents
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// a single path registered for notifications for specific event set. Setting a watch
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// means using platform-specific API calls for creating / initializing said watch.
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// For each watcher the API call is:
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//
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// - FSEvents: FSEventStreamCreate
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// - inotify: notify_add_watch
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// - kqueue: kevent
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// - ReadDirectoryChangesW: CreateFile+ReadDirectoryChangesW
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// - FEN: port_get
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//
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// To rewatch means to either shrink or expand an event set that was previously
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// registered during watch operation for particular filesystem watch.
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//
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// A watchpoint is a list of user channel and event set pairs for particular
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// path (watchpoint tree's node). A single watchpoint can contain multiple
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// different user channels registered to listen for one or more events. A single
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// user channel can be registered in one or more watchpoints, recurisve and
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// non-recursive ones as well.
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package notify
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