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| <div class="subTitle">org.apache.mahout.cf.taste.impl.common</div> |
| <h2 title="Class Cache" class="title">Class Cache<K,V></h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.mahout.cf.taste.impl.common.Cache<K,V></li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><K,V></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public final class <span class="typeNameLabel">Cache<K,V></span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><K,V></pre> |
| <div class="block"><p> |
| An efficient Map-like class which caches values for keys. Values are not "put" into a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="class in org.apache.mahout.cf.taste.impl.common"><code>Cache</code></a>; |
| instead the caller supplies the instance with an implementation of <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a> which can load the |
| value for a given key. |
| </p> |
| |
| <p> |
| The cache does not support <code>null</code> keys. |
| </p> |
| |
| <p> |
| Thanks to Amila Jayasooriya for helping evaluate performance of the rewrite of this class, as part of a |
| Google Summer of Code 2007 project. |
| </p></div> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="type parameter in Cache.MatchPredicate">T</a>></span></code> |
| <div class="block">Used by {#link #removeKeysMatching(Object)} to decide things that are matching.</div> |
| </td> |
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| </li> |
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| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#Cache-org.apache.mahout.cf.taste.impl.common.Retriever-">Cache</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><? super <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>,? extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> retriever)</code> |
| <div class="block"> |
| Creates a new cache based on the given <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#Cache-org.apache.mahout.cf.taste.impl.common.Retriever-int-">Cache</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><? super <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>,? extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> retriever, |
| int maxEntries)</code> |
| <div class="block"> |
| Creates a new cache based on the given <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a> and with given maximum size.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#clear--">clear</a></span>()</code> |
| <div class="block"> |
| Clears the cache.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#get-K-">get</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a> key)</code> |
| <div class="block"> |
| Returns cached value for a key.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#remove-K-">remove</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a> key)</code> |
| <div class="block"> |
| Uncaches any existing value for a given key.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#removeKeysMatching-org.apache.mahout.cf.taste.impl.common.Cache.MatchPredicate-">removeKeysMatching</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>> predicate)</code> |
| <div class="block">Clears all cache entries whose key matches the given predicate.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#removeValueMatching-org.apache.mahout.cf.taste.impl.common.Cache.MatchPredicate-">removeValueMatching</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> predicate)</code> |
| <div class="block">Clears all cache entries whose value matches the given predicate.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
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| <div class="details"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="Cache-org.apache.mahout.cf.taste.impl.common.Retriever-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>Cache</h4> |
| <pre>public Cache(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><? super <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>,? extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> retriever)</pre> |
| <div class="block"><p> |
| Creates a new cache based on the given <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a>. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>retriever</code> - object which can retrieve values for keys</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="Cache-org.apache.mahout.cf.taste.impl.common.Retriever-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>Cache</h4> |
| <pre>public Cache(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><? super <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>,? extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> retriever, |
| int maxEntries)</pre> |
| <div class="block"><p> |
| Creates a new cache based on the given <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a> and with given maximum size. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>retriever</code> - object which can retrieve values for keys</dd> |
| <dd><code>maxEntries</code> - maximum number of entries the cache will store before evicting some</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
| <a name="get-java.lang.Object-"> |
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| </a><a name="get-K-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>get</h4> |
| <pre>public <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a> get(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a> key) |
| throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre> |
| <div class="block"><p> |
| Returns cached value for a key. If it does not exist, it is loaded using a <a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common"><code>Retriever</code></a>. |
| </p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html#get-K-">get</a></code> in interface <code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Retriever.html" title="interface in org.apache.mahout.cf.taste.impl.common">Retriever</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>,<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - cache key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>value for that key</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></code> - if an exception occurs while retrieving a new cached value</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="remove-java.lang.Object-"> |
| <!-- --> |
| </a><a name="remove-K-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>remove</h4> |
| <pre>public void remove(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a> key)</pre> |
| <div class="block"><p> |
| Uncaches any existing value for a given key. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - cache key</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="removeKeysMatching-org.apache.mahout.cf.taste.impl.common.Cache.MatchPredicate-"> |
| <!-- --> |
| </a> |
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| <h4>removeKeysMatching</h4> |
| <pre>public void removeKeysMatching(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">K</a>> predicate)</pre> |
| <div class="block">Clears all cache entries whose key matches the given predicate.</div> |
| </li> |
| </ul> |
| <a name="removeValueMatching-org.apache.mahout.cf.taste.impl.common.Cache.MatchPredicate-"> |
| <!-- --> |
| </a> |
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| <h4>removeValueMatching</h4> |
| <pre>public void removeValueMatching(<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.MatchPredicate.html" title="interface in org.apache.mahout.cf.taste.impl.common">Cache.MatchPredicate</a><<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/Cache.html" title="type parameter in Cache">V</a>> predicate)</pre> |
| <div class="block">Clears all cache entries whose value matches the given predicate.</div> |
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| <h4>clear</h4> |
| <pre>public void clear()</pre> |
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| Clears the cache. |
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| <h4>toString</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre> |
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