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https://github.com/golang/go
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faa69481e7
This change is the first step in centralizing control of modifications to different files, either within the workspace or outside of it. We add a source.FileAction type to pass into the internal/lsp/cache package and handle the difference between opening and creating a file. Now that we load all packages in a workspace by default, we no longer need to re-load a file on open. This CL should enable CL 206883 to work correctly. Change-Id: I2ddb21ca2dd33720d668066e73283f5629d02867 Reviewed-on: https://go-review.googlesource.com/c/tools/+/206888 Run-TryBot: Rebecca Stambler <rstambler@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cache
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import (
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"sync"
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"golang.org/x/tools/internal/lsp/source"
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)
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type watcher struct {
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id uint64
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callback func(action source.FileAction) bool
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}
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type WatchMap struct {
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mu sync.Mutex
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nextID uint64
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watchers map[interface{}][]watcher
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}
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func NewWatchMap() *WatchMap {
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return &WatchMap{watchers: make(map[interface{}][]watcher)}
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}
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func (w *WatchMap) Watch(key interface{}, callback func(source.FileAction) bool) func() {
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w.mu.Lock()
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defer w.mu.Unlock()
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id := w.nextID
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w.nextID++
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w.watchers[key] = append(w.watchers[key], watcher{
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id: id,
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callback: callback,
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})
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return func() {
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// unwatch if invoked
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w.mu.Lock()
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defer w.mu.Unlock()
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// find and delete the watcher entry
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entries := w.watchers[key]
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for i, entry := range entries {
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if entry.id == id {
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// found it
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entries[i] = entries[len(entries)-1]
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entries = entries[:len(entries)-1]
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}
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}
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}
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}
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func (w *WatchMap) Notify(key interface{}, action source.FileAction) bool {
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// Make a copy of the watcher callbacks so we don't need to hold
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// the mutex during the callbacks (to avoid deadlocks).
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w.mu.Lock()
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entries := w.watchers[key]
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entriesCopy := make([]watcher, len(entries))
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copy(entriesCopy, entries)
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w.mu.Unlock()
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var result bool
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for _, entry := range entriesCopy {
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result = entry.callback(action) || result
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}
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return result
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}
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