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| <div class="subTitle">org.apache.openjpa.kernel</div> |
| <h2 title="Interface FinderCache" class="title">Interface FinderCache<K,V,R></h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../org/apache/openjpa/lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/openjpa/jdbc/kernel/FinderCacheImpl.html" title="class in org.apache.openjpa.jdbc.kernel">FinderCacheImpl</a></dd> |
| </dl> |
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| <pre>public interface <span class="strong">FinderCache<K,V,R></span> |
| extends <a href="../../../../org/apache/openjpa/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="../../../../org/apache/openjpa/kernel/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="strong">Since:</span></dt> |
| <dd>2.0.0</dd> |
| <dt><span class="strong">Author:</span></dt> |
| <dd>Pinaki Poddar</dd> |
| <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/openjpa/kernel/QueryHints.html#HINT_IGNORE_FINDER"><code>QueryHints.HINT_IGNORE_FINDER</code></a>, |
| <a href="../../../../org/apache/openjpa/kernel/QueryHints.html#HINT_INVALIDATE_FINDER"><code>QueryHints.HINT_INVALIDATE_FINDER</code></a>, |
| <a href="../../../../org/apache/openjpa/kernel/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></dl> |
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| <h3>Method Summary</h3> |
| <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span>Methods</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#addExclusionPattern(java.lang.String)">addExclusionPattern</a></strong>(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> pattern)</code> |
| <div class="block">Adds the given pattern to the list of excluded patterns.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#cache(K,%20V,%20org.apache.openjpa.kernel.FetchConfiguration)">cache</a></strong>(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key, |
| <a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a> value, |
| <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a> fetch)</code> |
| <div class="block">Cache a FinderQuery for the given key and value.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#get(K,%20org.apache.openjpa.kernel.FetchConfiguration)">get</a></strong>(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key, |
| <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a> fetch)</code> |
| <div class="block">Get the FinderQuery for the given key.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#getExcludes()">getExcludes</a></strong>()</code> |
| <div class="block">Gets the excluded stringified keys.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#getMapView()">getMapView</a></strong>()</code> |
| <div class="block">Get a map view of the cached entries as strings.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/openjpa/kernel/QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#getStatistics()">getStatistics</a></strong>()</code> |
| <div class="block">Gets the simple statistics for executed finder queries.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#invalidate(K)">invalidate</a></strong>(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key)</code> |
| <div class="block">Remove the FinderQuery for the given key from this cache.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#isExcluded(K)">isExcluded</a></strong>(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key)</code> |
| <div class="block">Affirms if the given key matches any of the exclusion patterns.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#markUncachable(K)">markUncachable</a></strong>(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key)</code> |
| <div class="block">Marks the given key as not amenable to caching.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/kernel/FinderCache.html#removeExclusionPattern(java.lang.String)">removeExclusionPattern</a></strong>(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> pattern)</code> |
| <div class="block">Removes the given pattern from the list of excluded patterns.</div> |
| </td> |
| </tr> |
| </table> |
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| <!-- --> |
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| <h3>Methods inherited from interface org.apache.openjpa.lib.conf.<a href="../../../../org/apache/openjpa/lib/conf/Configurable.html" title="interface in org.apache.openjpa.lib.conf">Configurable</a></h3> |
| <code><a href="../../../../org/apache/openjpa/lib/conf/Configurable.html#endConfiguration()">endConfiguration</a>, <a href="../../../../org/apache/openjpa/lib/conf/Configurable.html#setConfiguration(org.apache.openjpa.lib.conf.Configuration)">setConfiguration</a>, <a href="../../../../org/apache/openjpa/lib/conf/Configurable.html#startConfiguration()">startConfiguration</a></code></li> |
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| <h3>Method Detail</h3> |
| <a name="get(java.lang.Object,org.apache.openjpa.kernel.FetchConfiguration)"> |
| <!-- --> |
| </a><a name="get(K, org.apache.openjpa.kernel.FetchConfiguration)"> |
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| </a> |
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| <li class="blockList"> |
| <h4>get</h4> |
| <pre><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>> get(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key, |
| <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a> fetch)</pre> |
| <div class="block">Get the FinderQuery for the given key.</div> |
| <dl><dt><span class="strong">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="strong">Returns:</span></dt><dd>FinderQuery for the given mapping.</dd></dl> |
| </li> |
| </ul> |
| <a name="cache(java.lang.Object,java.lang.Object,org.apache.openjpa.kernel.FetchConfiguration)"> |
| <!-- --> |
| </a><a name="cache(K, V, org.apache.openjpa.kernel.FetchConfiguration)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>cache</h4> |
| <pre><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>> cache(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key, |
| <a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a> value, |
| <a href="../../../../org/apache/openjpa/kernel/FetchConfiguration.html" title="interface in org.apache.openjpa.kernel">FetchConfiguration</a> fetch)</pre> |
| <div class="block">Cache a FinderQuery for the given key and value.</div> |
| <dl><dt><span class="strong">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="strong">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></dl> |
| </li> |
| </ul> |
| <a name="getMapView()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getMapView</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> getMapView()</pre> |
| <div class="block">Get a map view of the cached entries as strings.</div> |
| </li> |
| </ul> |
| <a name="invalidate(java.lang.Object)"> |
| <!-- --> |
| </a><a name="invalidate(K)"> |
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| <h4>invalidate</h4> |
| <pre>boolean invalidate(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key)</pre> |
| <div class="block">Remove the FinderQuery for the given key from this cache.</div> |
| </li> |
| </ul> |
| <a name="markUncachable(java.lang.Object)"> |
| <!-- --> |
| </a><a name="markUncachable(K)"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>markUncachable</h4> |
| <pre><a href="../../../../org/apache/openjpa/kernel/FinderQuery.html" title="interface in org.apache.openjpa.kernel">FinderQuery</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">V</a>,<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">R</a>> markUncachable(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> 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="strong">Returns:</span></dt><dd>finder query for the given class if it had been cached before. |
| null otherwise.</dd></dl> |
| </li> |
| </ul> |
| <a name="isExcluded(java.lang.Object)"> |
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| </a><a name="isExcluded(K)"> |
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| <h4>isExcluded</h4> |
| <pre>boolean isExcluded(<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a> key)</pre> |
| <div class="block">Affirms if the given key matches any of the exclusion patterns.</div> |
| </li> |
| </ul> |
| <a name="getExcludes()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getExcludes</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> getExcludes()</pre> |
| <div class="block">Gets the excluded stringified keys.</div> |
| </li> |
| </ul> |
| <a name="addExclusionPattern(java.lang.String)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addExclusionPattern</h4> |
| <pre>void addExclusionPattern(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> 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> |
| </li> |
| </ul> |
| <a name="removeExclusionPattern(java.lang.String)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
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| <h4>removeExclusionPattern</h4> |
| <pre>void removeExclusionPattern(<a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> 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> |
| </li> |
| </ul> |
| <a name="getStatistics()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getStatistics</h4> |
| <pre><a href="../../../../org/apache/openjpa/kernel/QueryStatistics.html" title="interface in org.apache.openjpa.kernel">QueryStatistics</a><<a href="../../../../org/apache/openjpa/kernel/FinderCache.html" title="type parameter in FinderCache">K</a>> getStatistics()</pre> |
| <div class="block">Gets the simple statistics for executed finder queries.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
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