sm/cache
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Keep the same tense in docstrings, and remove a little ambiguity

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This commit is contained in:
Patrick Mylund Nielsen 2012-06-22 04:24:48 +01:00
parent 8f6294df58
commit 0a962bf9eb
2 changed files with 31 additions and 32 deletions
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30
README
View File

@ -92,28 +92,28 @@ foo.Println(foo.Num)
== Reference
func New(de, ci time.Duration) *Cache
Returns a new cache with a given default expiration duration and cleanup
Return a new cache with a given default expiration duration and cleanup
interval. If the expiration duration is less than 1, the items in the cache
never expire (by default), and must be deleted manually. If the cleanup
interval is less than one, expired items are not deleted from the cache
before their next lookup or before calling DeleteExpired.
func (c *Cache) Set(k string, x interface{}, d time.Duration)
Adds an item to the cache, replacing any existing item. If the duration is
Add an item to the cache, replacing any existing item. If the duration is
0, the cache's default expiration time is used. If it is -1, the item never
expires.
func (c *Cache) Add(k string, x interface{}, d time.Duration) error
Adds an item to the cache only if an item doesn't already exist for the
Add an item to the cache only if an item doesn't already exist for the
given key, or if the existing item has expired. Returns an error if not.
func (c *Cache) Replace(k string, x interface{}, d time.Duration) error
Sets a new value for the cache item only if it already exists. Returns an
Set a new value for the cache key only if it already exists. Returns an
error if it does not.
func (c *Cache) Get(k string) (interface{}, bool)
Gets an item from the cache. Returns the item or nil, and a bool indicating
whether the given key was found in the cache.
Get an item from the cache. Returns the item or nil, and a bool indicating
whether the key was found.
func (c *Cache) Increment(k string, n int64) error
Increment an item of type int, int8, int16, int32, int64, uintptr, uint,
@ -136,28 +136,28 @@ func (c *Cache) Decrement(k string, n int64) error
possible to decrement it by n.
func (c *Cache) Delete(k string)
Deletes an item from the cache. Does nothing if the item does not exist in
the cache.
Delete an item from the cache. Does nothing if the key does not exist in the
cache.
func (c *Cache) DeleteExpired()
Deletes all expired items from the cache.
Delete all expired items from the cache.
func (c *Cache) Flush()
Deletes all items from the cache.
Delete all items from the cache.
func (c *Cache) Save(w io.Writer) error
Writes the cache's items (using Gob) to an io.Writer. Returns an error if
Write the cache's items (using Gob) to an io.Writer. Returns an error if
the serialization fails, e.g. because there are unserializable objects like
channels in the cache.
func (c *Cache) SaveFile(fname string) error
Saves the cache's items to the given filename, creating the file if it
Save the cache's items to the given filename, creating the file if it
doesn't exist, and overwriting it if it does.
func (c *Cache) Load(r io.Reader) error
Adds (Gob-serialized) cache items from an io.Reader, excluding any items
that already exist in the current cache.
Add (Gob-serialized) cache items from an io.Reader, excluding any items
with keys that already exist in the current cache.
func (c *Cache) LoadFile(fname string) error
Loads and adds cache items from the given filename, excluding any items
that already exist in the current cache.
with keys that already exist in the current cache.

33
cache.go
View File

@ -36,7 +36,7 @@ type cache struct {
janitor *janitor
}
// Adds an item to the cache, replacing any existing item. If the duration is 0,
// Add an item to the cache, replacing any existing item. If the duration is 0,
// the cache's default expiration time is used. If it is -1, the item never
// expires.
func (c *cache) Set(k string, x interface{}, d time.Duration) {
@ -62,8 +62,8 @@ func (c *cache) set(k string, x interface{}, d time.Duration) {
}
}
// Adds an item to the cache only if an item doesn't already exist for the given
// key, or if the existing item has expired. Returns an error if not.
// Add an item to the cache only if an item doesn't already exist for the given
// key, or if the existing item has expired. Returns an error otherwise.
func (c *cache) Add(k string, x interface{}, d time.Duration) error {
c.mu.Lock()
_, found := c.get(k)
@ -76,7 +76,7 @@ func (c *cache) Add(k string, x interface{}, d time.Duration) error {
return nil
}
// Sets a new value for the cache item only if it already exists. Returns an
// Set a new value for the cache key only if it already exists. Returns an
// error if it does not.
func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
c.mu.Lock()
@ -90,8 +90,8 @@ func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
return nil
}
// Gets an item from the cache. Returns the item or nil, and a bool indicating
// whether the given key was found in the cache.
// Get an item from the cache. Returns the item or nil, and a bool indicating
// whether the key was found.
func (c *cache) Get(k string) (interface{}, bool) {
c.mu.Lock()
x, found := c.get(k)
@ -177,8 +177,7 @@ func (c *cache) Decrement(k string, n int64) error {
return c.Increment(k, n*-1)
}
// Deletes an item from the cache. Does nothing if the item does not exist in
// the cache.
// Delete an item from the cache. Does nothing if the key is not in the cache.
func (c *cache) Delete(k string) {
c.mu.Lock()
c.delete(k)
@ -189,7 +188,7 @@ func (c *cache) delete(k string) {
delete(c.Items, k)
}
// Deletes all expired items from the cache.
// Delete all expired items from the cache.
func (c *cache) DeleteExpired() {
c.mu.Lock()
for k, v := range c.Items {
@ -200,7 +199,7 @@ func (c *cache) DeleteExpired() {
c.mu.Unlock()
}
// Writes the cache's items (using Gob) to an io.Writer.
// Write the cache's items (using Gob) to an io.Writer.
func (c *cache) Save(w io.Writer) (err error) {
enc := gob.NewEncoder(w)
@ -216,7 +215,7 @@ func (c *cache) Save(w io.Writer) (err error) {
return
}
// Saves the cache's items to the given filename, creating the file if it
// Save the cache's items to the given filename, creating the file if it
// doesn't exist, and overwriting it if it does.
func (c *cache) SaveFile(fname string) error {
fp, err := os.Create(fname)
@ -226,8 +225,8 @@ func (c *cache) SaveFile(fname string) error {
return c.Save(fp)
}
// Adds (Gob-serialized) cache items from an io.Reader, excluding any items that
// already exist in the current cache.
// Add (Gob-serialized) cache items from an io.Reader, excluding any items with
// keys that already exist in the current cache.
func (c *cache) Load(r io.Reader) error {
dec := gob.NewDecoder(r)
items := map[string]*Item{}
@ -243,8 +242,8 @@ func (c *cache) Load(r io.Reader) error {
return err
}
// Loads and adds cache items from the given filename, excluding any items that
// already exist in the current cache.
// Load and add cache items from the given filename, excluding any items with
// keys that already exist in the current cache.
func (c *cache) LoadFile(fname string) error {
fp, err := os.Open(fname)
if err != nil {
@ -253,7 +252,7 @@ func (c *cache) LoadFile(fname string) error {
return c.Load(fp)
}
// Deletes all items from the cache.
// Delete all items from the cache.
func (c *cache) Flush() {
c.mu.Lock()
c.Items = map[string]*Item{}
@ -286,7 +285,7 @@ func stopJanitor(c *Cache) {
c.janitor.Stop()
}
// Returns a new cache with a given default expiration duration and cleanup
// Return a new cache with a given default expiration duration and cleanup
// interval. If the expiration duration is less than 1, the items in the cache
// never expire (by default), and must be deleted manually. If the cleanup
// interval is less than one, expired items are not deleted from the cache