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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.openjpa.datacache</a></div>
<h2 title="Interface QueryCache" class="title">Interface QueryCache</h2>
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<dt>All Superinterfaces:</dt>
<dd><code><a href="../lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</a></code>, <code><a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a></code></dd>
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<dl>
<dt>All Known Implementing Classes:</dt>
<dd><code><a href="AbstractQueryCache.html" title="class in org.apache.openjpa.datacache">AbstractQueryCache</a></code>, <code><a href="ConcurrentQueryCache.html" title="class in org.apache.openjpa.datacache">ConcurrentQueryCache</a></code>, <code><a href="DelegatingQueryCache.html" title="class in org.apache.openjpa.datacache">DelegatingQueryCache</a></code></dd>
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<hr>
<pre>public interface <span class="typeNameLabel">QueryCache</span>
extends <a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a>, <a href="../lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</a></pre>
<div class="block">Interface that must be implemented by any level 2 query cache
used by OpenJPA. These methods should be threadsafe.
Most query cache implementations will probably implement
<a href="../lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf"><code>Configurable</code></a> to receive a handle to the
system configuration on construction.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.2.5</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Patrick Linskey</dd>
</dl>
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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="#addTypesChangedListener(org.apache.openjpa.datacache.TypesChangedListener)">addTypesChangedListener</a></span>&#8203;(<a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a>&nbsp;listen)</code></th>
<td class="colLast">
<div class="block">Add a new types event listener to this cache.</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">Remove all data from this cache.</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="#close()">close</a></span>()</code></th>
<td class="colLast">
<div class="block">Free the resources used by this cache.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get(org.apache.openjpa.datacache.QueryKey)">get</a></span>&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</code></th>
<td class="colLast">
<div class="block">Return a list of oids for the given query key.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../kernel/QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a>&lt;<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</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 query results.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#initialize(org.apache.openjpa.datacache.DataCacheManager)">initialize</a></span>&#8203;(<a href="DataCacheManager.html" title="interface in org.apache.openjpa.datacache">DataCacheManager</a>&nbsp;manager)</code></th>
<td class="colLast">
<div class="block">Initialize any resources associated with the given
<a href="DataCacheManager.html" title="interface in org.apache.openjpa.datacache"><code>DataCacheManager</code></a>.</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="#pin(org.apache.openjpa.datacache.QueryKey)">pin</a></span>&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</code></th>
<td class="colLast">
<div class="block">Pin the value stored under <code>qk</code> into the
cache.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#put(org.apache.openjpa.datacache.QueryKey,org.apache.openjpa.datacache.QueryResult)">put</a></span>&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk,
<a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a>&nbsp;oids)</code></th>
<td class="colLast">
<div class="block">Set the list of OIDs for the given query key.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#remove(org.apache.openjpa.datacache.QueryKey)">remove</a></span>&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</code></th>
<td class="colLast">
<div class="block">Remove the value stored under the given query key.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#removeTypesChangedListener(org.apache.openjpa.datacache.TypesChangedListener)">removeTypesChangedListener</a></span>&#8203;(<a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a>&nbsp;listen)</code></th>
<td class="colLast">
<div class="block">Remove an types event listener from this cache.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#unpin(org.apache.openjpa.datacache.QueryKey)">unpin</a></span>&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</code></th>
<td class="colLast">
<div class="block">Unpin the value stored under <code>key</code> into the cache.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#writeLock()">writeLock</a></span>()</code></th>
<td class="colLast">
<div class="block">Obtain a write lock on the cache.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#writeUnlock()">writeUnlock</a></span>()</code></th>
<td class="colLast">
<div class="block">Release the write lock on the cache.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.openjpa.datacache.<a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a></h3>
<code><a href="TypesChangedListener.html#onTypesChanged(org.apache.openjpa.datacache.TypesChangedEvent)">onTypesChanged</a></code></li>
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<a id="initialize(org.apache.openjpa.datacache.DataCacheManager)">
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<h4>initialize</h4>
<pre class="methodSignature">void&nbsp;initialize&#8203;(<a href="DataCacheManager.html" title="interface in org.apache.openjpa.datacache">DataCacheManager</a>&nbsp;manager)</pre>
<div class="block">Initialize any resources associated with the given
<a href="DataCacheManager.html" title="interface in org.apache.openjpa.datacache"><code>DataCacheManager</code></a>.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.4.1</dd>
</dl>
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</ul>
<a id="get(org.apache.openjpa.datacache.QueryKey)">
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<h4>get</h4>
<pre class="methodSignature"><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a>&nbsp;get&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</pre>
<div class="block">Return a list of oids for the given query key. This is an
unmodifiable list.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The query results matching the given key, or null if none</dd>
</dl>
</li>
</ul>
<a id="put(org.apache.openjpa.datacache.QueryKey,org.apache.openjpa.datacache.QueryResult)">
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<h4>put</h4>
<pre class="methodSignature"><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a>&nbsp;put&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk,
<a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a>&nbsp;oids)</pre>
<div class="block">Set the list of OIDs for the given query key. A reference
to the given list will be stored in the query cache, so the
list should not be modified after invoking this method.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The previously cached value, or <code>null</code> if
the key was not previously cached. See <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true#put(K,V)" title="class or interface in java.util" class="externalLink"><code>Map.put(K, V)</code></a>
for more information.</dd>
</dl>
</li>
</ul>
<a id="remove(org.apache.openjpa.datacache.QueryKey)">
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<h4>remove</h4>
<pre class="methodSignature"><a href="QueryResult.html" title="class in org.apache.openjpa.datacache">QueryResult</a>&nbsp;remove&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</pre>
<div class="block">Remove the value stored under the given query key.
This method is typically not invoked directly from outside
the <code>QueryCache</code> class. Instead, the cache should
be updated by implementing <a href="../event/RemoteCommitListener.html" title="interface in org.apache.openjpa.event"><code>RemoteCommitListener</code></a>,
which will result in all queries that may be invalid being dropped.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The previously cached value, or <code>null</code> if
the key was not previously cached. See <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Map.html?is-external=true#remove(java.lang.Object)" title="class or interface in java.util" class="externalLink"><code>Map.remove(java.lang.Object)</code></a>
for more information.</dd>
</dl>
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<a id="clear()">
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<h4>clear</h4>
<pre class="methodSignature">void&nbsp;clear()</pre>
<div class="block">Remove all data from this cache.</div>
</li>
</ul>
<a id="pin(org.apache.openjpa.datacache.QueryKey)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>pin</h4>
<pre class="methodSignature">boolean&nbsp;pin&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</pre>
<div class="block">Pin the value stored under <code>qk</code> into the
cache. This method guarantees that <code>qk</code>'s value
will not be expired if the cache exceeds its capacity. It
causes this data to be ignored when determining whether or not
the cache is full, effectively increasing the total amount of
data stored in the cache. This method does not affect the
behavior of <a href="#remove(org.apache.openjpa.datacache.QueryKey)"><code>remove(org.apache.openjpa.datacache.QueryKey)</code></a> or <a href="TypesChangedListener.html#onTypesChanged(org.apache.openjpa.datacache.TypesChangedEvent)"><code>TypesChangedListener.onTypesChanged(org.apache.openjpa.datacache.TypesChangedEvent)</code></a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if <code>key</code>'s value was
pinned into the cache; <code>false</code> if the key is not in the cache.</dd>
</dl>
</li>
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<a id="unpin(org.apache.openjpa.datacache.QueryKey)">
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<h4>unpin</h4>
<pre class="methodSignature">boolean&nbsp;unpin&#8203;(<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&nbsp;qk)</pre>
<div class="block">Unpin the value stored under <code>key</code> into the cache.
This method reverses a previous invocation of <a href="#pin(org.apache.openjpa.datacache.QueryKey)"><code>pin(org.apache.openjpa.datacache.QueryKey)</code></a>.
This method does not remove anything from the cache; it merely
makes <code>key</code>'s value a candidate for flushing from the cache.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if <code>key</code>'s value was
unpinned from the cache; <code>false</code> if the
key is not in the cache.</dd>
</dl>
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<h4>writeLock</h4>
<pre class="methodSignature">void&nbsp;writeLock()</pre>
<div class="block">Obtain a write lock on the cache.</div>
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<a id="writeUnlock()">
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<h4>writeUnlock</h4>
<pre class="methodSignature">void&nbsp;writeUnlock()</pre>
<div class="block">Release the write lock on the cache.</div>
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<a id="addTypesChangedListener(org.apache.openjpa.datacache.TypesChangedListener)">
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<h4>addTypesChangedListener</h4>
<pre class="methodSignature">void&nbsp;addTypesChangedListener&#8203;(<a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a>&nbsp;listen)</pre>
<div class="block">Add a new types event listener to this cache.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.3.3</dd>
</dl>
</li>
</ul>
<a id="removeTypesChangedListener(org.apache.openjpa.datacache.TypesChangedListener)">
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<h4>removeTypesChangedListener</h4>
<pre class="methodSignature">boolean&nbsp;removeTypesChangedListener&#8203;(<a href="TypesChangedListener.html" title="interface in org.apache.openjpa.datacache">TypesChangedListener</a>&nbsp;listen)</pre>
<div class="block">Remove an types event listener from this cache.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.3.3</dd>
</dl>
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<h4>close</h4>
<pre class="methodSignature">void&nbsp;close()</pre>
<div class="block">Free the resources used by this cache.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../lib/util/Closeable.html#close()">close</a></code>&nbsp;in interface&nbsp;<code><a href="../lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</a></code></dd>
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<h4>getStatistics</h4>
<pre class="methodSignature"><a href="../kernel/QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a>&lt;<a href="QueryKey.html" title="class in org.apache.openjpa.datacache">QueryKey</a>&gt;&nbsp;getStatistics()</pre>
<div class="block">Gets the simple statistics for query results.
If the statistics gathering is disabled, an empty statistics is returned.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1.0</dd>
</dl>
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