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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.openjpa.kernel</a></div>
<h2 title="Interface FinderCache" class="title">Interface FinderCache&lt;K,&#8203;V,&#8203;R&gt;</h2>
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<dt>All Superinterfaces:</dt>
<dd><code><a href="../lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</a></code></dd>
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<dl>
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../jdbc/kernel/FinderCacheImpl.html" title="class in org.apache.openjpa.jdbc.kernel">FinderCacheImpl</a></code></dd>
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<hr>
<pre>public interface <span class="typeNameLabel">FinderCache&lt;K,&#8203;V,&#8203;R&gt;</span>
extends <a href="../lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</a></pre>
<div class="block">A cache to create and maintain <a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel"><code>finder queries</code></a>.
A finder query is a query to find instance of a given class by its primary
identity. This cache maintains finder queries by generic identifier of
parameterized type K.
A cached query by an identifier of parameterized type K.
A query can be cached by an identifier and value represented by parameterized
type V. Caching results in creating a new instance of FinderQuery FQ from the
value V such that FQ can be executed to return a result of parameterized type
R. A request to cache may not be successful if this cache determines the
value V to be not cachable.
Both get() and put() operations can be controlled by the hints associated
with FetchConfiguration.
The target database query FQ associated to a cached finder query F
<em>may</em> depend upon query execution context such as fetch plan or
lock group. This cache, by design, does not monitor the context or
automatically invalidate an entry when the original query F is executed
with context parameters that affect the target query FQ.
The user must notify this receiver to invalidate a cached entry when
execution context changes in a way that will modify the resultant database
language query FQ.
One of the built-in mechanism (available in JPA facade) is to set query hints
to either invalidate the query entirely or ignore the cached version for the
current execution.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0.0</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Pinaki Poddar</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="QueryHints.html#HINT_IGNORE_FINDER"><code>QueryHints.HINT_IGNORE_FINDER</code></a>,
<a href="QueryHints.html#HINT_INVALIDATE_FINDER"><code>QueryHints.HINT_INVALIDATE_FINDER</code></a>,
<a href="QueryHints.html#HINT_RECACHE_FINDER"><code>This cache allows customization of whether a query can be cached or not
via either explicit marking of certain classes as non-cachable (which is
irreversible) or addition/removal of exclusion patterns (which is reversible)</code></a></dd>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addExclusionPattern(java.lang.String)">addExclusionPattern</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;pattern)</code></th>
<td class="colLast">
<div class="block">Adds the given pattern to the list of excluded patterns.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#cache(K,V,org.apache.openjpa.kernel.FetchConfiguration)">cache</a></span>&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key,
<a href="FinderCache.html" title="type parameter in FinderCache">V</a>&nbsp;value,
<a href="FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a>&nbsp;fetch)</code></th>
<td class="colLast">
<div class="block">Cache a FinderQuery for the given key and value.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get(K,org.apache.openjpa.kernel.FetchConfiguration)">get</a></span>&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key,
<a href="FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a>&nbsp;fetch)</code></th>
<td class="colLast">
<div class="block">Get the FinderQuery for the given key.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</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>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExcludes()">getExcludes</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the excluded stringified keys.</div>
</td>
</tr>
<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;<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>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getMapView()">getMapView</a></span>()</code></th>
<td class="colLast">
<div class="block">Get a map view of the cached entries as strings.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStatistics()">getStatistics</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the simple statistics for executed finder queries.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#invalidate(K)">invalidate</a></span>&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</code></th>
<td class="colLast">
<div class="block">Remove the FinderQuery for the given key from this cache.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isExcluded(K)">isExcluded</a></span>&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</code></th>
<td class="colLast">
<div class="block">Affirms if the given key matches any of the exclusion patterns.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#markUncachable(K)">markUncachable</a></span>&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</code></th>
<td class="colLast">
<div class="block">Marks the given key as not amenable to caching.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#removeExclusionPattern(java.lang.String)">removeExclusionPattern</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;pattern)</code></th>
<td class="colLast">
<div class="block">Removes the given pattern from the list of excluded patterns.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.openjpa.lib.conf.<a href="../lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</a></h3>
<code><a href="../lib/conf/Configurable.html#endConfiguration()">endConfiguration</a>, <a href="../lib/conf/Configurable.html#setConfiguration(org.apache.openjpa.lib.conf.Configuration)">setConfiguration</a>, <a href="../lib/conf/Configurable.html#startConfiguration()">startConfiguration</a></code></li>
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<a id="get(java.lang.Object,org.apache.openjpa.kernel.FetchConfiguration)">
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<h4>get</h4>
<pre class="methodSignature"><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;&nbsp;get&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key,
<a href="FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a>&nbsp;fetch)</pre>
<div class="block">Get the FinderQuery for the given key.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - for which the finder is looked up</dd>
<dd><code>fecth</code> - may contain hints to control lookup operation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>FinderQuery for the given mapping.</dd>
</dl>
</li>
</ul>
<a id="cache(java.lang.Object,java.lang.Object,org.apache.openjpa.kernel.FetchConfiguration)">
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<h4>cache</h4>
<pre class="methodSignature"><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;&nbsp;cache&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key,
<a href="FinderCache.html" title="type parameter in FinderCache">V</a>&nbsp;value,
<a href="FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a>&nbsp;fetch)</pre>
<div class="block">Cache a FinderQuery for the given key and value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - for which the finder is cached.</dd>
<dd><code>value</code> - used to construct the finder query</dd>
<dd><code>fetch</code> - may contain hints to control cache operation.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the finder query that has been cached. It may be newly
constructed or an existing query. If the given key-value can not be
cached, then return null.</dd>
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<h4>getMapView</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/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&gt;&nbsp;getMapView()</pre>
<div class="block">Get a map view of the cached entries as strings.</div>
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<h4>invalidate</h4>
<pre class="methodSignature">boolean&nbsp;invalidate&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</pre>
<div class="block">Remove the FinderQuery for the given key from this cache.</div>
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<h4>markUncachable</h4>
<pre class="methodSignature"><a href="FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">V</a>,&#8203;<a href="FinderCache.html" title="type parameter in FinderCache">R</a>&gt;&nbsp;markUncachable&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</pre>
<div class="block">Marks the given key as not amenable to caching.
Explicit marking helps to avoid repeated computational cost of
determining whether finder for a key can be cached or not.
Explicit marking can not be reversed by removal of exclusion patterns.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>finder query for the given class if it had been cached before.
null otherwise.</dd>
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<h4>isExcluded</h4>
<pre class="methodSignature">boolean&nbsp;isExcluded&#8203;(<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&nbsp;key)</pre>
<div class="block">Affirms if the given key matches any of the exclusion patterns.</div>
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<h4>getExcludes</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</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>&gt;&nbsp;getExcludes()</pre>
<div class="block">Gets the excluded stringified keys.</div>
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<h4>addExclusionPattern</h4>
<pre class="methodSignature">void&nbsp;addExclusionPattern&#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;pattern)</pre>
<div class="block">Adds the given pattern to the list of excluded patterns. Any existing
cache entry whose key matches the given pattern will be marked
non-cachable in a reversible manner.</div>
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<h4>removeExclusionPattern</h4>
<pre class="methodSignature">void&nbsp;removeExclusionPattern&#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;pattern)</pre>
<div class="block">Removes the given pattern from the list of excluded patterns.
Any excluded entry that matches the given pattern can now be cached
again, unless it has been marked non-cachable explicitly.</div>
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<h4>getStatistics</h4>
<pre class="methodSignature"><a href="QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a>&lt;<a href="FinderCache.html" title="type parameter in FinderCache">K</a>&gt;&nbsp;getStatistics()</pre>
<div class="block">Gets the simple statistics for executed finder queries.</div>
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