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<div class="subTitle">org.apache.mahout.cf.taste.impl.model</div>
<h2 title="Class PlusAnonymousConcurrentUserDataModel" class="title">Class PlusAnonymousConcurrentUserDataModel</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>
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<ul class="inheritance">
<li><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">org.apache.mahout.cf.taste.impl.model.PlusAnonymousUserDataModel</a></li>
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<ul class="inheritance">
<li>org.apache.mahout.cf.taste.impl.model.PlusAnonymousConcurrentUserDataModel</li>
</ul>
</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/common/Refreshable.html" title="interface in org.apache.mahout.cf.taste.common">Refreshable</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></dd>
</dl>
<hr>
<br>
<pre>public final class <span class="typeNameLabel">PlusAnonymousConcurrentUserDataModel</span>
extends <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></pre>
<div class="block"><p>
This is a special thread-safe version of <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model"><code>PlusAnonymousUserDataModel</code></a>
which allow multiple concurrent anonymous requests.
</p>
<p>
To use it, you have to estimate the number of concurrent anonymous users of your application.
The pool of users with the given size will be created. For each anonymous recommendations request,
a user has to be taken from the pool and returned back immediately afterwards.
</p>
<p>
If no more users are available in the pool, anonymous recommendations cannot be produced.
</p>
</p>
Setup:
<pre>
int concurrentUsers = 100;
DataModel realModel = ..
PlusAnonymousConcurrentUserDataModel plusModel =
new PlusAnonymousConcurrentUserDataModel(realModel, concurrentUsers);
Recommender recommender = ...;
</pre>
Real-time recommendation:
<pre>
PlusAnonymousConcurrentUserDataModel plusModel =
(PlusAnonymousConcurrentUserDataModel) recommender.getDataModel();
// Take the next available anonymous user from the pool
Long anonymousUserID = plusModel.takeAvailableUser();
PreferenceArray tempPrefs = ..
tempPrefs.setUserID(0, anonymousUserID);
tempPrefs.setItemID(0, itemID);
plusModel.setTempPrefs(tempPrefs, anonymousUserID);
// Produce recommendations
recommender.recommend(anonymousUserID, howMany);
// It is very IMPORTANT to release user back to the pool
plusModel.releaseUser(anonymousUserID);
</pre>
</p></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../../serialized-form.html#org.apache.mahout.cf.taste.impl.model.PlusAnonymousConcurrentUserDataModel">Serialized Form</a></dd>
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<h3>Fields inherited from class&nbsp;org.apache.mahout.cf.taste.impl.model.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#TEMP_USER_ID">TEMP_USER_ID</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#PlusAnonymousConcurrentUserDataModel-org.apache.mahout.cf.taste.model.DataModel-int-">PlusAnonymousConcurrentUserDataModel</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;delegate,
int&nbsp;maxConcurrentUsers)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</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/model/PlusAnonymousConcurrentUserDataModel.html#clearTempPrefs-long-">clearTempPrefs</a></span>(long&nbsp;anonymousUserID)</code>
<div class="block">Clears temporary preferences for a given anonymous user.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getNumUsers--">getNumUsers</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></span>(long&nbsp;itemID1,
long&nbsp;itemID2)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></span>(long&nbsp;itemID)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></span>(long&nbsp;userID)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">Retrieves the preference value for a single user and item.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#getUserIDs--">getUserIDs</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#releaseUser-java.lang.Long-">releaseUser</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;userID)</code>
<div class="block">Release previously taken anonymous user and return it to the pool.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#removePreference-long-long-">removePreference</a></span>(long&nbsp;userID,
long&nbsp;itemID)</code>
<div class="block">
Removes a particular preference for a user.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#setPreference-long-long-float-">setPreference</a></span>(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)</code>
<div class="block">
Sets a particular preference (item plus rating) for a user.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#setTempPrefs-org.apache.mahout.cf.taste.model.PreferenceArray-long-">setTempPrefs</a></span>(<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;prefs,
long&nbsp;anonymousUserID)</code>
<div class="block">Sets temporary preferences for a given anonymous user.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousConcurrentUserDataModel.html#takeAvailableUser--">takeAvailableUser</a></span>()</code>
<div class="block">Take the next available concurrent anonymous users from the pool.</div>
</td>
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<h3>Methods inherited from class&nbsp;org.apache.mahout.cf.taste.impl.model.<a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></h3>
<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#clearTempPrefs--">clearTempPrefs</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getDelegate--">getDelegate</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getItemIDs--">getItemIDs</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getMaxPreference--">getMaxPreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getMinPreference--">getMinPreference</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumItems--">getNumItems</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#hasPreferenceValues--">hasPreferenceValues</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#refresh-java.util.Collection-">refresh</a>, <a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#setTempPrefs-org.apache.mahout.cf.taste.model.PreferenceArray-">setTempPrefs</a></code></li>
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<h3>Methods inherited from class&nbsp;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#toString--" title="class or interface in java.lang">toString</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>
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<h3>Constructor Detail</h3>
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<h4>PlusAnonymousConcurrentUserDataModel</h4>
<pre>public&nbsp;PlusAnonymousConcurrentUserDataModel(<a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a>&nbsp;delegate,
int&nbsp;maxConcurrentUsers)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>delegate</code> - Real model where anonymous users will be added to</dd>
<dd><code>maxConcurrentUsers</code> - Maximum allowed number of concurrent anonymous users</dd>
</dl>
</li>
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</li>
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<h3>Method Detail</h3>
<a name="takeAvailableUser--">
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<h4>takeAvailableUser</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;takeAvailableUser()</pre>
<div class="block">Take the next available concurrent anonymous users from the pool.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>User ID or null if no more users are available</dd>
</dl>
</li>
</ul>
<a name="releaseUser-java.lang.Long-">
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<h4>releaseUser</h4>
<pre>public&nbsp;boolean&nbsp;releaseUser(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;userID)</pre>
<div class="block">Release previously taken anonymous user and return it to the pool.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of a previously taken anonymous user</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the user was previously taken, false otherwise</dd>
</dl>
</li>
</ul>
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<pre>public&nbsp;void&nbsp;setTempPrefs(<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;prefs,
long&nbsp;anonymousUserID)</pre>
<div class="block">Sets temporary preferences for a given anonymous user.</div>
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<pre>public&nbsp;void&nbsp;clearTempPrefs(long&nbsp;anonymousUserID)</pre>
<div class="block">Clears temporary preferences for a given anonymous user.</div>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/LongPrimitiveIterator.html" title="interface in org.apache.mahout.cf.taste.impl.common">LongPrimitiveIterator</a>&nbsp;getUserIDs()
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getUserIDs--">getUserIDs</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getUserIDs--">getUserIDs</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all user IDs in the model, in order</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 error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesFromUser(long&nbsp;userID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferencesFromUser-long-">getPreferencesFromUser</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>user's preferences, ordered by item ID</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/impl/common/FastIDSet.html" title="class in org.apache.mahout.cf.taste.impl.common">FastIDSet</a>&nbsp;getItemIDsFromUser(long&nbsp;userID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getItemIDsFromUser-long-">getItemIDsFromUser</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - ID of user to get prefs for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>IDs of items user expresses a preference for</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="../../../../../../../org/apache/mahout/cf/taste/model/PreferenceArray.html" title="interface in org.apache.mahout.cf.taste.model">PreferenceArray</a>&nbsp;getPreferencesForItem(long&nbsp;itemID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferencesForItem-long-">getPreferencesForItem</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all existing <a href="../../../../../../../org/apache/mahout/cf/taste/model/Preference.html" title="interface in org.apache.mahout.cf.taste.model"><code>Preference</code></a>s expressed for that item, ordered by user ID, as an array</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
<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 error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Float.html?is-external=true" title="class or interface in java.lang">Float</a>&nbsp;getPreferenceValue(long&nbsp;userID,
long&nbsp;itemID)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the preference value for a single user and item.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferenceValue-long-long-">getPreferenceValue</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID to get pref value from</dd>
<dd><code>itemID</code> - item ID to get pref value for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>preference value from the given user for the given item or null if none exists</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
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<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&nbsp;getPreferenceTime(long&nbsp;userID,
long&nbsp;itemID)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">DataModel</a></code></span></div>
<div class="block">Retrieves the time at which a preference value from a user and item was set, if known.
Time is expressed in the usual way, as a number of milliseconds since the epoch.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getPreferenceTime-long-long-">getPreferenceTime</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user ID for preference in question</dd>
<dd><code>itemID</code> - item ID for preference in question</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>time at which preference was set or null if no preference exists or its time is not known</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
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<h4>getNumUsers</h4>
<pre>public&nbsp;int&nbsp;getNumUsers()
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsers--">getNumUsers</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsers--">getNumUsers</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>total number of users known to the model.</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 error occurs while accessing the data</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsersWithPreferenceFor-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID</code> - item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the item</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 error occurs while accessing the data</dd>
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<pre>public&nbsp;int&nbsp;getNumUsersWithPreferenceFor(long&nbsp;itemID1,
long&nbsp;itemID2)
throws <a href="../../../../../../../org/apache/mahout/cf/taste/common/TasteException.html" title="class in org.apache.mahout.cf.taste.common">TasteException</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#getNumUsersWithPreferenceFor-long-long-">getNumUsersWithPreferenceFor</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>itemID1</code> - first item ID to check for</dd>
<dd><code>itemID2</code> - second item ID to check for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of users who have expressed a preference for the items</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 error occurs while accessing the data</dd>
</dl>
</li>
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<h4>setPreference</h4>
<pre>public&nbsp;void&nbsp;setPreference(long&nbsp;userID,
long&nbsp;itemID,
float&nbsp;value)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-">DataModel</a></code></span></div>
<div class="block"><p>
Sets a particular preference (item plus rating) for a user.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#setPreference-long-long-float-">setPreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#setPreference-long-long-float-">setPreference</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user to set preference for</dd>
<dd><code>itemID</code> - item to set preference for</dd>
<dd><code>value</code> - preference value</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
</dl>
</li>
</ul>
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<h4>removePreference</h4>
<pre>public&nbsp;void&nbsp;removePreference(long&nbsp;userID,
long&nbsp;itemID)
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"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">DataModel</a></code></span></div>
<div class="block"><p>
Removes a particular preference for a user.
</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html#removePreference-long-long-">removePreference</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/model/DataModel.html" title="interface in org.apache.mahout.cf.taste.model">DataModel</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html#removePreference-long-long-">removePreference</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/mahout/cf/taste/impl/model/PlusAnonymousUserDataModel.html" title="class in org.apache.mahout.cf.taste.impl.model">PlusAnonymousUserDataModel</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>userID</code> - user from which to remove preference</dd>
<dd><code>itemID</code> - item to remove preference for</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchItemException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchItemException</a></code> - if the item does not exist</dd>
<dd><code><a href="../../../../../../../org/apache/mahout/cf/taste/common/NoSuchUserException.html" title="class in org.apache.mahout.cf.taste.common">NoSuchUserException</a></code> - if the user does not exist</dd>
<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 error occurs while accessing the data</dd>
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