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Diffstat (limited to 'vendor/github.com/golang/groupcache')
| -rw-r--r-- | vendor/github.com/golang/groupcache/LICENSE | 191 | ||||
| -rw-r--r-- | vendor/github.com/golang/groupcache/README.md | 73 | ||||
| -rw-r--r-- | vendor/github.com/golang/groupcache/lru/lru.go | 133 |
3 files changed, 0 insertions, 397 deletions
diff --git a/vendor/github.com/golang/groupcache/LICENSE b/vendor/github.com/golang/groupcache/LICENSE deleted file mode 100644 index 37ec93a14..000000000 --- a/vendor/github.com/golang/groupcache/LICENSE +++ /dev/null @@ -1,191 +0,0 @@ -Apache License -Version 2.0, January 2004 -http://www.apache.org/licenses/ - -TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION - -1. 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We also -recommend that a file or class name and description of purpose be included on -the same "printed page" as the copyright notice for easier identification within -third-party archives. - - Copyright [yyyy] [name of copyright owner] - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. diff --git a/vendor/github.com/golang/groupcache/README.md b/vendor/github.com/golang/groupcache/README.md deleted file mode 100644 index 70c29da16..000000000 --- a/vendor/github.com/golang/groupcache/README.md +++ /dev/null @@ -1,73 +0,0 @@ -# groupcache - -## Summary - -groupcache is a caching and cache-filling library, intended as a -replacement for memcached in many cases. - -For API docs and examples, see http://godoc.org/github.com/golang/groupcache - -## Comparison to memcached - -### **Like memcached**, groupcache: - - * shards by key to select which peer is responsible for that key - -### **Unlike memcached**, groupcache: - - * does not require running a separate set of servers, thus massively - reducing deployment/configuration pain. groupcache is a client - library as well as a server. It connects to its own peers. - - * comes with a cache filling mechanism. Whereas memcached just says - "Sorry, cache miss", often resulting in a thundering herd of - database (or whatever) loads from an unbounded number of clients - (which has resulted in several fun outages), groupcache coordinates - cache fills such that only one load in one process of an entire - replicated set of processes populates the cache, then multiplexes - the loaded value to all callers. - - * does not support versioned values. If key "foo" is value "bar", - key "foo" must always be "bar". There are neither cache expiration - times, nor explicit cache evictions. Thus there is also no CAS, - nor Increment/Decrement. This also means that groupcache.... - - * ... supports automatic mirroring of super-hot items to multiple - processes. This prevents memcached hot spotting where a machine's - CPU and/or NIC are overloaded by very popular keys/values. - - * is currently only available for Go. It's very unlikely that I - (bradfitz@) will port the code to any other language. - -## Loading process - -In a nutshell, a groupcache lookup of **Get("foo")** looks like: - -(On machine #5 of a set of N machines running the same code) - - 1. Is the value of "foo" in local memory because it's super hot? If so, use it. - - 2. Is the value of "foo" in local memory because peer #5 (the current - peer) is the owner of it? If so, use it. - - 3. Amongst all the peers in my set of N, am I the owner of the key - "foo"? (e.g. does it consistent hash to 5?) If so, load it. If - other callers come in, via the same process or via RPC requests - from peers, they block waiting for the load to finish and get the - same answer. If not, RPC to the peer that's the owner and get - the answer. If the RPC fails, just load it locally (still with - local dup suppression). - -## Users - -groupcache is in production use by dl.google.com (its original user), -parts of Blogger, parts of Google Code, parts of Google Fiber, parts -of Google production monitoring systems, etc. - -## Presentations - -See http://talks.golang.org/2013/oscon-dl.slide - -## Help - -Use the golang-nuts mailing list for any discussion or questions. diff --git a/vendor/github.com/golang/groupcache/lru/lru.go b/vendor/github.com/golang/groupcache/lru/lru.go deleted file mode 100644 index 532cc45e6..000000000 --- a/vendor/github.com/golang/groupcache/lru/lru.go +++ /dev/null @@ -1,133 +0,0 @@ -/* -Copyright 2013 Google Inc. - -Licensed under the Apache License, Version 2.0 (the "License"); -you may not use this file except in compliance with the License. -You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - -Unless required by applicable law or agreed to in writing, software -distributed under the License is distributed on an "AS IS" BASIS, -WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -See the License for the specific language governing permissions and -limitations under the License. -*/ - -// Package lru implements an LRU cache. -package lru - -import "container/list" - -// Cache is an LRU cache. It is not safe for concurrent access. -type Cache struct { - // MaxEntries is the maximum number of cache entries before - // an item is evicted. Zero means no limit. - MaxEntries int - - // OnEvicted optionally specificies a callback function to be - // executed when an entry is purged from the cache. - OnEvicted func(key Key, value interface{}) - - ll *list.List - cache map[interface{}]*list.Element -} - -// A Key may be any value that is comparable. See http://golang.org/ref/spec#Comparison_operators -type Key interface{} - -type entry struct { - key Key - value interface{} -} - -// New creates a new Cache. -// If maxEntries is zero, the cache has no limit and it's assumed -// that eviction is done by the caller. -func New(maxEntries int) *Cache { - return &Cache{ - MaxEntries: maxEntries, - ll: list.New(), - cache: make(map[interface{}]*list.Element), - } -} - -// Add adds a value to the cache. -func (c *Cache) Add(key Key, value interface{}) { - if c.cache == nil { - c.cache = make(map[interface{}]*list.Element) - c.ll = list.New() - } - if ee, ok := c.cache[key]; ok { - c.ll.MoveToFront(ee) - ee.Value.(*entry).value = value - return - } - ele := c.ll.PushFront(&entry{key, value}) - c.cache[key] = ele - if c.MaxEntries != 0 && c.ll.Len() > c.MaxEntries { - c.RemoveOldest() - } -} - -// Get looks up a key's value from the cache. -func (c *Cache) Get(key Key) (value interface{}, ok bool) { - if c.cache == nil { - return - } - if ele, hit := c.cache[key]; hit { - c.ll.MoveToFront(ele) - return ele.Value.(*entry).value, true - } - return -} - -// Remove removes the provided key from the cache. -func (c *Cache) Remove(key Key) { - if c.cache == nil { - return - } - if ele, hit := c.cache[key]; hit { - c.removeElement(ele) - } -} - -// RemoveOldest removes the oldest item from the cache. -func (c *Cache) RemoveOldest() { - if c.cache == nil { - return - } - ele := c.ll.Back() - if ele != nil { - c.removeElement(ele) - } -} - -func (c *Cache) removeElement(e *list.Element) { - c.ll.Remove(e) - kv := e.Value.(*entry) - delete(c.cache, kv.key) - if c.OnEvicted != nil { - c.OnEvicted(kv.key, kv.value) - } -} - -// Len returns the number of items in the cache. -func (c *Cache) Len() int { - if c.cache == nil { - return 0 - } - return c.ll.Len() -} - -// Clear purges all stored items from the cache. -func (c *Cache) Clear() { - if c.OnEvicted != nil { - for _, e := range c.cache { - kv := e.Value.(*entry) - c.OnEvicted(kv.key, kv.value) - } - } - c.ll = nil - c.cache = nil -} |