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729 lines
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729 lines
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<title>cache - The Go Programming Language</title>
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<div id="page" class="wide">
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<div class="container">
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<h1>Package cache</h1>
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<div id="nav"></div>
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<!--
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Copyright 2009 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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-->
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Note: Static (i.e., not template-generated) href and id
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</script>
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<div id="short-nav">
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<dl>
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<dd><code>import "github.com/syndtr/goleveldb/leveldb/cache"</code></dd>
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</dl>
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<dl>
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<dd><a href="index.html#pkg-overview" class="overviewLink">Overview</a></dd>
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<dd><a href="index.html#pkg-index" class="indexLink">Index</a></dd>
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<!-- The package's Name is printed as title by the top-level template -->
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</div>
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Overview section">Overview ▾</h2>
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<p>
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Package cache provides interface and implementation of a cache algorithms.
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</p>
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</div>
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</div>
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<h2 class="toggleButton" title="Click to show Index section">Index ▹</h2>
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<h2 class="toggleButton" title="Click to hide Index section">Index ▾</h2>
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<!-- Table of contents for API; must be named manual-nav to turn off auto nav. -->
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<div id="manual-nav">
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<dl>
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<dd><a href="index.html#Cache">type Cache</a></dd>
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<dd> <a href="index.html#NewCache">func NewCache(cacher Cacher) *Cache</a></dd>
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<dd> <a href="index.html#Cache.Capacity">func (r *Cache) Capacity() int</a></dd>
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<dd> <a href="index.html#Cache.Close">func (r *Cache) Close() error</a></dd>
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<dd> <a href="index.html#Cache.CloseWeak">func (r *Cache) CloseWeak() error</a></dd>
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<dd> <a href="index.html#Cache.Delete">func (r *Cache) Delete(ns, key uint64, onDel func()) bool</a></dd>
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<dd> <a href="index.html#Cache.Evict">func (r *Cache) Evict(ns, key uint64) bool</a></dd>
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<dd> <a href="index.html#Cache.EvictAll">func (r *Cache) EvictAll()</a></dd>
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<dd> <a href="index.html#Cache.EvictNS">func (r *Cache) EvictNS(ns uint64)</a></dd>
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<dd> <a href="index.html#Cache.Get">func (r *Cache) Get(ns, key uint64, setFunc func() (size int, value Value)) *Handle</a></dd>
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<dd> <a href="index.html#Cache.Nodes">func (r *Cache) Nodes() int</a></dd>
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<dd> <a href="index.html#Cache.SetCapacity">func (r *Cache) SetCapacity(capacity int)</a></dd>
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<dd> <a href="index.html#Cache.Size">func (r *Cache) Size() int</a></dd>
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<dd><a href="index.html#Cacher">type Cacher</a></dd>
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<dd> <a href="index.html#NewLRU">func NewLRU(capacity int) Cacher</a></dd>
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<dd><a href="index.html#Handle">type Handle</a></dd>
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<dd> <a href="index.html#Handle.Release">func (h *Handle) Release()</a></dd>
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<dd> <a href="index.html#Handle.Value">func (h *Handle) Value() Value</a></dd>
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<dd><a href="index.html#NamespaceGetter">type NamespaceGetter</a></dd>
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<dd> <a href="index.html#NamespaceGetter.Get">func (g *NamespaceGetter) Get(key uint64, setFunc func() (size int, value Value)) *Handle</a></dd>
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<dd><a href="index.html#Node">type Node</a></dd>
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<dd> <a href="index.html#Node.GetHandle">func (n *Node) GetHandle() *Handle</a></dd>
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<dd> <a href="index.html#Node.Key">func (n *Node) Key() uint64</a></dd>
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<dd> <a href="index.html#Node.NS">func (n *Node) NS() uint64</a></dd>
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<dd> <a href="index.html#Node.Ref">func (n *Node) Ref() int32</a></dd>
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<dd> <a href="index.html#Node.Size">func (n *Node) Size() int</a></dd>
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<dd> <a href="index.html#Node.Value">func (n *Node) Value() Value</a></dd>
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<dd><a href="index.html#Value">type Value</a></dd>
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</dl>
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</div><!-- #manual-nav -->
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<h4>Package files</h4>
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<p>
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<span style="font-size:90%">
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<a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go">cache.go</a>
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<a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/lru.go">lru.go</a>
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</span>
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</p>
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</div><!-- .expanded -->
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</div><!-- #pkg-index -->
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<div id="pkg-callgraph" class="toggle" style="display: none">
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<div class="collapsed">
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<h2 class="toggleButton" title="Click to show Internal Call Graph section">Internal call graph ▹</h2>
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</div> <!-- .expanded -->
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<div class="expanded">
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<h2 class="toggleButton" title="Click to hide Internal Call Graph section">Internal call graph ▾</h2>
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<p>
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In the call graph viewer below, each node
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is a function belonging to this package
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and its children are the functions it
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calls—perhaps dynamically.
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</p>
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<p>
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The root nodes are the entry points of the
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package: functions that may be called from
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outside the package.
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There may be non-exported or anonymous
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functions among them if they are called
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dynamically from another package.
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</p>
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<p>
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Click a node to visit that function's source code.
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From there you can visit its callers by
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clicking its declaring <code>func</code>
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token.
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</p>
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<p>
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Functions may be omitted if they were
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determined to be unreachable in the
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particular programs or tests that were
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analyzed.
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</p>
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<!-- Zero means show all package entry points. -->
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<ul style="margin-left: 0.5in" id="callgraph-0" class="treeview"></ul>
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</div>
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</div> <!-- #pkg-callgraph -->
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<h2 id="Cache">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=6455:6586#L278">Cache</a></h2>
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<pre>type Cache struct {
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<span class="comment">// contains filtered or unexported fields</span>
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}</pre>
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<p>
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Cache is a 'cache map'.
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</p>
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<h3 id="NewCache">func <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=6669:6704#L289">NewCache</a></h3>
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<pre>func NewCache(cacher <a href="index.html#Cacher">Cacher</a>) *<a href="index.html#Cache">Cache</a></pre>
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<p>
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NewCache creates a new 'cache map'. The cacher is optional and
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may be nil.
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</p>
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<h3 id="Cache.Capacity">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=7757:7787#L338">Capacity</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Capacity() <a href="../../../../../builtin/index.html#int">int</a></pre>
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<p>
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Capacity returns cache capacity.
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</p>
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<h3 id="Cache.Close">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=11132:11161#L505">Close</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Close() <a href="../../../../../builtin/index.html#error">error</a></pre>
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<p>
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Close closes the 'cache map' and forcefully releases all 'cache node'.
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</p>
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<h3 id="Cache.CloseWeak">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=11866:11899#L545">CloseWeak</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) CloseWeak() <a href="../../../../../builtin/index.html#error">error</a></pre>
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<p>
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CloseWeak closes the 'cache map' and evict all 'cache node' from cacher, but
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unlike Close it doesn't forcefully releases 'cache node'.
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</p>
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<h3 id="Cache.Delete">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=9515:9572#L410">Delete</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Delete(ns, key <a href="../../../../../builtin/index.html#uint64">uint64</a>, onDel func()) <a href="../../../../../builtin/index.html#bool">bool</a></pre>
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<p>
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Delete removes and ban 'cache node' with the given namespace and key.
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A banned 'cache node' will never inserted into the 'cache tree'. Ban
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only attributed to the particular 'cache node', so when a 'cache node'
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is recreated it will not be banned.
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</p>
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<p>
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If onDel is not nil, then it will be executed if such 'cache node'
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doesn't exist or once the 'cache node' is released.
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</p>
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<p>
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Delete return true is such 'cache node' exist.
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</p>
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<h3 id="Cache.Evict">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=10203:10245#L450">Evict</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Evict(ns, key <a href="../../../../../builtin/index.html#uint64">uint64</a>) <a href="../../../../../builtin/index.html#bool">bool</a></pre>
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<p>
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Evict evicts 'cache node' with the given namespace and key. This will
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simply call Cacher.Evict.
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</p>
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<p>
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Evict return true is such 'cache node' exist.
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</p>
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<h3 id="Cache.EvictAll">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=10915:10941#L492">EvictAll</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) EvictAll()</pre>
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<p>
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EvictAll evicts all 'cache node'. This will simply call Cacher.EvictAll.
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</p>
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<h3 id="Cache.EvictNS">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=10687:10721#L479">EvictNS</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) EvictNS(ns <a href="../../../../../builtin/index.html#uint64">uint64</a>)</pre>
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<p>
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EvictNS evicts 'cache node' with the given namespace. This will
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simply call Cacher.EvictNS.
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</p>
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<h3 id="Cache.Get">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=8304:8387#L358">Get</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Get(ns, key <a href="../../../../../builtin/index.html#uint64">uint64</a>, setFunc func() (size <a href="../../../../../builtin/index.html#int">int</a>, value <a href="index.html#Value">Value</a>)) *<a href="index.html#Handle">Handle</a></pre>
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<p>
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Get gets 'cache node' with the given namespace and key.
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If cache node is not found and setFunc is not nil, Get will atomically creates
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the 'cache node' by calling setFunc. Otherwise Get will returns nil.
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</p>
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<p>
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The returned 'cache handle' should be released after use by calling Release
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method.
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</p>
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<h3 id="Cache.Nodes">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=7523:7550#L328">Nodes</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Nodes() <a href="../../../../../builtin/index.html#int">int</a></pre>
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<p>
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Nodes returns number of 'cache node' in the map.
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</p>
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<h3 id="Cache.SetCapacity">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=7893:7934#L346">SetCapacity</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) SetCapacity(capacity <a href="../../../../../builtin/index.html#int">int</a>)</pre>
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<p>
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SetCapacity sets cache capacity.
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</p>
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<h3 id="Cache.Size">func (*Cache) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=7650:7676#L333">Size</a></h3>
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<pre>func (r *<a href="index.html#Cache">Cache</a>) Size() <a href="../../../../../builtin/index.html#int">int</a></pre>
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<p>
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Size returns sums of 'cache node' size in the map.
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</p>
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<h2 id="Cacher">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=500:1014#L10">Cacher</a></h2>
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<pre>type Cacher interface {
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<span class="comment">// Capacity returns cache capacity.</span>
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Capacity() <a href="../../../../../builtin/index.html#int">int</a>
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<span class="comment">// SetCapacity sets cache capacity.</span>
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SetCapacity(capacity <a href="../../../../../builtin/index.html#int">int</a>)
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<span class="comment">// Promote promotes the 'cache node'.</span>
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Promote(n *<a href="index.html#Node">Node</a>)
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<span class="comment">// Ban evicts the 'cache node' and prevent subsequent 'promote'.</span>
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Ban(n *<a href="index.html#Node">Node</a>)
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<span class="comment">// Evict evicts the 'cache node'.</span>
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Evict(n *<a href="index.html#Node">Node</a>)
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<span class="comment">// EvictNS evicts 'cache node' with the given namespace.</span>
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EvictNS(ns <a href="../../../../../builtin/index.html#uint64">uint64</a>)
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<span class="comment">// EvictAll evicts all 'cache node'.</span>
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EvictAll()
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<span class="comment">// Close closes the 'cache tree'</span>
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Close() <a href="../../../../../builtin/index.html#error">error</a>
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}</pre>
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<p>
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Cacher provides interface to implements a caching functionality.
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An implementation must be safe for concurrent use.
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</p>
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<h3 id="NewLRU">func <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/lru.go?s=3092:3124#L181">NewLRU</a></h3>
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<pre>func NewLRU(capacity <a href="../../../../../builtin/index.html#int">int</a>) <a href="index.html#Cacher">Cacher</a></pre>
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<p>
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NewLRU create a new LRU-cache.
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</p>
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<h2 id="Handle">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=13265:13314#L629">Handle</a></h2>
|
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<pre>type Handle struct {
|
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<span class="comment">// contains filtered or unexported fields</span>
|
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}</pre>
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<p>
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Handle is a 'cache handle' of a 'cache node'.
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</p>
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<h3 id="Handle.Release">func (*Handle) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=13574:13600#L644">Release</a></h3>
|
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<pre>func (h *<a href="index.html#Handle">Handle</a>) Release()</pre>
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<p>
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Release releases this 'cache handle'.
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It is safe to call release multiple times.
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</p>
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<h3 id="Handle.Value">func (*Handle) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=13364:13394#L634">Value</a></h3>
|
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<pre>func (h *<a href="index.html#Handle">Handle</a>) Value() <a href="index.html#Value">Value</a></pre>
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<p>
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Value returns the value of the 'cache node'.
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</p>
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<h2 id="NamespaceGetter">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=1241:1300#L41">NamespaceGetter</a></h2>
|
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<pre>type NamespaceGetter struct {
|
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Cache *<a href="index.html#Cache">Cache</a>
|
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NS <a href="../../../../../builtin/index.html#uint64">uint64</a>
|
|
}</pre>
|
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<p>
|
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NamespaceGetter provides convenient wrapper for namespace.
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|
</p>
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<h3 id="NamespaceGetter.Get">func (*NamespaceGetter) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=1342:1431#L47">Get</a></h3>
|
|
<pre>func (g *<a href="index.html#NamespaceGetter">NamespaceGetter</a>) Get(key <a href="../../../../../builtin/index.html#uint64">uint64</a>, setFunc func() (size <a href="../../../../../builtin/index.html#int">int</a>, value <a href="index.html#Value">Value</a>)) *<a href="index.html#Handle">Handle</a></pre>
|
|
<p>
|
|
Get simply calls Cache.Get() method.
|
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</p>
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<h2 id="Node">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12138:12301#L563">Node</a></h2>
|
|
<pre>type Node struct {
|
|
CacheData <a href="../../../../../unsafe/index.html">unsafe</a>.<a href="../../../../../unsafe/index.html#Pointer">Pointer</a>
|
|
<span class="comment">// contains filtered or unexported fields</span>
|
|
}</pre>
|
|
<p>
|
|
Node is a 'cache node'.
|
|
</p>
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<h3 id="Node.GetHandle">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12819:12853#L605">GetHandle</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) GetHandle() *<a href="index.html#Handle">Handle</a></pre>
|
|
<p>
|
|
GetHandle returns an handle for this 'cache node'.
|
|
</p>
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|
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<h3 id="Node.Key">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12429:12456#L585">Key</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) Key() <a href="../../../../../builtin/index.html#uint64">uint64</a></pre>
|
|
<p>
|
|
Key returns this 'cache node' key.
|
|
</p>
|
|
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|
|
<h3 id="Node.NS">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12346:12372#L580">NS</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) NS() <a href="../../../../../builtin/index.html#uint64">uint64</a></pre>
|
|
<p>
|
|
NS returns this 'cache node' namespace.
|
|
</p>
|
|
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|
|
<h3 id="Node.Ref">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12700:12726#L600">Ref</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) Ref() <a href="../../../../../builtin/index.html#int32">int32</a></pre>
|
|
<p>
|
|
Ref returns this 'cache node' ref counter.
|
|
</p>
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|
|
<h3 id="Node.Size">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12516:12541#L590">Size</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) Size() <a href="../../../../../builtin/index.html#int">int</a></pre>
|
|
<p>
|
|
Size returns this 'cache node' size.
|
|
</p>
|
|
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|
|
<h3 id="Node.Value">func (*Node) <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=12604:12632#L595">Value</a></h3>
|
|
<pre>func (n *<a href="index.html#Node">Node</a>) Value() <a href="index.html#Value">Value</a></pre>
|
|
<p>
|
|
Value returns this 'cache node' value.
|
|
</p>
|
|
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|
|
<h2 id="Value">type <a href="http://localhost:6060/src/github.com/syndtr/goleveldb/leveldb/cache/cache.go?s=1155:1177#L38">Value</a></h2>
|
|
<pre>type Value interface{}</pre>
|
|
<p>
|
|
Value is a 'cacheable object'. It may implements util.Releaser, if
|
|
so the the Release method will be called once object is released.
|
|
</p>
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<div id="footer">
|
|
Build version go1.6.<br>
|
|
Except as <a href="https://developers.google.com/site-policies#restrictions">noted</a>,
|
|
the content of this page is licensed under the
|
|
Creative Commons Attribution 3.0 License,
|
|
and code is licensed under a <a href="http://localhost:6060/LICENSE">BSD license</a>.<br>
|
|
<a href="http://localhost:6060/doc/tos.html">Terms of Service</a> |
|
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<a href="http://www.google.com/intl/en/policies/privacy/">Privacy Policy</a>
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</div>
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</div><!-- .container -->
|
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</div><!-- #page -->
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<!-- TODO(adonovan): load these from <head> using "defer" attribute? -->
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<script type="text/javascript" src="../../../../../../lib/godoc/jquery.js"></script>
|
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<script type="text/javascript" src="../../../../../../lib/godoc/jquery.treeview.js"></script>
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<script type="text/javascript" src="../../../../../../lib/godoc/jquery.treeview.edit.js"></script>
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