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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.openjpa.instrumentation</a></div>
<h2 title="Interface DataCacheInstrument" class="title">Interface DataCacheInstrument</h2>
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<dt>All Known Subinterfaces:</dt>
<dd><code><a href="jmx/DataCacheJMXInstrumentMBean.html" title="interface in org.apache.openjpa.instrumentation.jmx">DataCacheJMXInstrumentMBean</a></code></dd>
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<dt>All Known Implementing Classes:</dt>
<dd><code><a href="AbstractDataCacheInstrument.html" title="class in org.apache.openjpa.instrumentation">AbstractDataCacheInstrument</a></code>, <code><a href="jmx/DataCacheJMXInstrument.html" title="class in org.apache.openjpa.instrumentation.jmx">DataCacheJMXInstrument</a></code></dd>
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<pre>public interface <span class="typeNameLabel">DataCacheInstrument</span></pre>
<div class="block">Interface for providing instrumented data cache metrics and operations.</div>
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<h3>Method Summary</h3>
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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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#cache(java.lang.String,boolean)">cache</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className,
boolean&nbsp;enable)</code></th>
<td class="colLast">
<div class="block">This method is used to enable/disable caching for the specified className.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clear()">clear</a></span>()</code></th>
<td class="colLast">
<div class="block">Clears all data from the DataCache.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#collectStatistics(boolean)">collectStatistics</a></span>&#8203;(boolean&nbsp;enable)</code></th>
<td class="colLast">&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCacheName()">getCacheName</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the name of the cache</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,&#8203;long[]&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCacheStatistics()">getCacheStatistics</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the CacheStatistics for the cache.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getHitCount()">getHitCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the hit count since cache statistics were last reset</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getHitCount(java.lang.String)">getHitCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total read requests that has been found in cache for the given class since last reset.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReadCount()">getReadCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the read count since cache statistics were last reset</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReadCount(java.lang.String)">getReadCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total read requests for the given class since last reset.</div>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang" class="externalLink">Boolean</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStatisticsEnabled()">getStatisticsEnabled</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns true if cache statistics are currently being calculated.</div>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalHitCount()">getTotalHitCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the total hits since start.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalHitCount(java.lang.String)">getTotalHitCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total read requests that has been found in cache for the given class since start.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalReadCount()">getTotalReadCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the total reads since start.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalReadCount(java.lang.String)">getTotalReadCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total read requests for the given class since start.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalWriteCount()">getTotalWriteCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the total writes since start.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTotalWriteCount(java.lang.String)">getTotalWriteCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total write requests for the given class since start.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getWriteCount()">getWriteCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the write count since cache statistics were last reset</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getWriteCount(java.lang.String)">getWriteCount</a></span>&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</code></th>
<td class="colLast">
<div class="block">Gets number of total write requests for the given class since last reset.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,&#8203;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang" class="externalLink">Boolean</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#listKnownTypes()">listKnownTypes</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the names of classes that are known to the cache and whether or not they are currently being cached.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#reset()">reset</a></span>()</code></th>
<td class="colLast">
<div class="block">Resets cache statistics</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html?is-external=true" title="class or interface in java.util" class="externalLink">Date</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#sinceDate()">sinceDate</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns date since cache statistics collection were last reset.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html?is-external=true" title="class or interface in java.util" class="externalLink">Date</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#startDate()">startDate</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns date cache statistics collection started.</div>
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<h4>getReadCount</h4>
<pre class="methodSignature">long&nbsp;getReadCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total read requests for the given class since last reset.</div>
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<pre class="methodSignature">long&nbsp;getHitCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total read requests that has been found in cache for the given class since last reset.</div>
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<pre class="methodSignature">long&nbsp;getWriteCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total write requests for the given class since last reset.</div>
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<pre class="methodSignature">long&nbsp;getTotalReadCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total read requests for the given class since start.</div>
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<pre class="methodSignature">long&nbsp;getTotalHitCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total read requests that has been found in cache for the given class since start.</div>
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<pre class="methodSignature">long&nbsp;getTotalWriteCount&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className)</pre>
<div class="block">Gets number of total write requests for the given class since start.</div>
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<h4>getCacheName</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;getCacheName()</pre>
<div class="block">Returns the name of the cache</div>
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<h4>getHitCount</h4>
<pre class="methodSignature">long&nbsp;getHitCount()</pre>
<div class="block">Returns the hit count since cache statistics were last reset</div>
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<pre class="methodSignature">long&nbsp;getReadCount()</pre>
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<pre class="methodSignature">long&nbsp;getTotalHitCount()</pre>
<div class="block">Returns the total hits since start.</div>
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<pre class="methodSignature">long&nbsp;getTotalReadCount()</pre>
<div class="block">Returns the total reads since start.</div>
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<pre class="methodSignature">long&nbsp;getTotalWriteCount()</pre>
<div class="block">Returns the total writes since start.</div>
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<pre class="methodSignature">long&nbsp;getWriteCount()</pre>
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<h4>reset</h4>
<pre class="methodSignature">void&nbsp;reset()</pre>
<div class="block">Resets cache statistics</div>
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<h4>sinceDate</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html?is-external=true" title="class or interface in java.util" class="externalLink">Date</a>&nbsp;sinceDate()</pre>
<div class="block">Returns date since cache statistics collection were last reset.</div>
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<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Date.html?is-external=true" title="class or interface in java.util" class="externalLink">Date</a>&nbsp;startDate()</pre>
<div class="block">Returns date cache statistics collection started.</div>
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<h4>listKnownTypes</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,&#8203;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang" class="externalLink">Boolean</a>&gt;&nbsp;listKnownTypes()</pre>
<div class="block">Returns the names of classes that are known to the cache and whether or not they are currently being cached.</div>
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<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang" class="externalLink">Boolean</a>&nbsp;getStatisticsEnabled()</pre>
<div class="block">Returns true if cache statistics are currently being calculated. False otherwise.</div>
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<pre class="methodSignature">void&nbsp;collectStatistics&#8203;(boolean&nbsp;enable)</pre>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>enable</code> - - If true, the cache will start collecting statistics. Else cache statistics will not be collected.</dd>
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<pre class="methodSignature">void&nbsp;cache&#8203;(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;className,
boolean&nbsp;enable)</pre>
<div class="block">This method is used to enable/disable caching for the specified className.</div>
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<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a>&lt;<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,&#8203;long[]&gt;&nbsp;getCacheStatistics()</pre>
<div class="block">Returns the CacheStatistics for the cache.
The format for this map is:
Type(String) => Enabled(Boolean),Read(Long),Hit(Long),Write(Long)</div>
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<h4>clear</h4>
<pre class="methodSignature">void&nbsp;clear()</pre>
<div class="block">Clears all data from the DataCache.</div>
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