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| <div class="subTitle">org.apache.geode.cache</div> |
| <h2 title="Interface CacheWriter" class="title">Interface CacheWriter<K,V></h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../org/apache/geode/cache/CacheCallback.html" title="interface in org.apache.geode.cache">CacheCallback</a>, <a href="../../../../org/apache/geode/cache/Declarable.html" title="interface in org.apache.geode.cache">Declarable</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/geode/cache/util/CacheWriterAdapter.html" title="class in org.apache.geode.cache.util">CacheWriterAdapter</a>, <a href="../../../../org/apache/geode/connectors/jdbc/JdbcWriter.html" title="class in org.apache.geode.connectors.jdbc">JdbcWriter</a>, <a href="../../../../org/apache/geode/modules/session/catalina/callback/LocalSessionCacheWriter.html" title="class in org.apache.geode.modules.session.catalina.callback">LocalSessionCacheWriter</a></dd> |
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| <pre>public interface <span class="typeNameLabel">CacheWriter<K,V></span> |
| extends <a href="../../../../org/apache/geode/cache/CacheCallback.html" title="interface in org.apache.geode.cache">CacheCallback</a></pre> |
| <div class="block">A user-defined object defined in the <a href="../../../../org/apache/geode/cache/RegionAttributes.html" title="interface in org.apache.geode.cache"><code>RegionAttributes</code></a> that is called synchronously before |
| a region or entry in the cache is modified. The typical use for a <code>CacheWriter</code> is to |
| update a database. Application writers should implement these methods to execute |
| application-specific behavior before the cache is modified. |
| |
| <p> |
| Before the region is updated via a put, create, or destroy operation, GemFire will call a |
| <code>CacheWriter</code> that is installed anywhere in any participating cache for that region, |
| preferring a local <code>CacheWriter</code> if there is one. Usually there will be only one |
| <code>CacheWriter</code> in the distributed system. If there are multiple |
| <code>CacheWriter</code>s available in the distributed system, the GemFire implementation always |
| prefers one that is stored locally, or else picks one arbitrarily; in any case only one |
| <code>CacheWriter</code> will be invoked. |
| |
| <p> |
| The <code>CacheWriter</code> is capable of aborting the update to the cache by throwing a |
| <code>CacheWriterException</code>. This exception or any runtime exception thrown by the |
| <code>CacheWriter</code> will abort the operation and the exception will be propagated to the |
| initiator of the operation, regardless of whether the initiator is in the same VM as the |
| <code>CacheWriter</code>. |
| |
| <p> |
| WARNING: To avoid risk of deadlock, do not invoke CacheFactory.getAnyInstance() from within any |
| callback methods. Instead use EntryEvent.getRegion().getCache() or |
| RegionEvent.getRegion().getCache().</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 3.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/AttributesFactory.html#setCacheWriter-org.apache.geode.cache.CacheWriter-"><code>AttributesFactory.setCacheWriter(org.apache.geode.cache.CacheWriter<K, V>)</code></a>, |
| <a href="../../../../org/apache/geode/cache/RegionAttributes.html#getCacheWriter--"><code>RegionAttributes.getCacheWriter()</code></a>, |
| <a href="../../../../org/apache/geode/cache/AttributesMutator.html#setCacheWriter-org.apache.geode.cache.CacheWriter-"><code>AttributesMutator.setCacheWriter(org.apache.geode.cache.CacheWriter<K, V>)</code></a></dd> |
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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"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/CacheWriter.html#beforeCreate-org.apache.geode.cache.EntryEvent-">beforeCreate</a></span>(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event)</code> |
| <div class="block">Called before an entry is created.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/CacheWriter.html#beforeDestroy-org.apache.geode.cache.EntryEvent-">beforeDestroy</a></span>(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event)</code> |
| <div class="block">Called before an entry is destroyed.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/CacheWriter.html#beforeRegionClear-org.apache.geode.cache.RegionEvent-">beforeRegionClear</a></span>(<a href="../../../../org/apache/geode/cache/RegionEvent.html" title="interface in org.apache.geode.cache">RegionEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event)</code> |
| <div class="block">Called before a region is cleared.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/CacheWriter.html#beforeRegionDestroy-org.apache.geode.cache.RegionEvent-">beforeRegionDestroy</a></span>(<a href="../../../../org/apache/geode/cache/RegionEvent.html" title="interface in org.apache.geode.cache">RegionEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event)</code> |
| <div class="block">Called before a region is destroyed.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/CacheWriter.html#beforeUpdate-org.apache.geode.cache.EntryEvent-">beforeUpdate</a></span>(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event)</code> |
| <div class="block">Called before an entry is updated.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.geode.cache.CacheCallback"> |
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| </a> |
| <h3>Methods inherited from interface org.apache.geode.cache.<a href="../../../../org/apache/geode/cache/CacheCallback.html" title="interface in org.apache.geode.cache">CacheCallback</a></h3> |
| <code><a href="../../../../org/apache/geode/cache/CacheCallback.html#close--">close</a></code></li> |
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| <h3>Methods inherited from interface org.apache.geode.cache.<a href="../../../../org/apache/geode/cache/Declarable.html" title="interface in org.apache.geode.cache">Declarable</a></h3> |
| <code><a href="../../../../org/apache/geode/cache/Declarable.html#init-java.util.Properties-">init</a>, <a href="../../../../org/apache/geode/cache/Declarable.html#initialize-org.apache.geode.cache.Cache-java.util.Properties-">initialize</a></code></li> |
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| <h3>Method Detail</h3> |
| <a name="beforeUpdate-org.apache.geode.cache.EntryEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>beforeUpdate</h4> |
| <pre>void beforeUpdate(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event) |
| throws <a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></pre> |
| <div class="block">Called before an entry is updated. The entry update is initiated by a <code>put</code> or a |
| <code>get</code> that causes the loader to update an existing entry. The entry previously |
| existed in the cache where the operation was initiated, although the old value may have been |
| null. The entry being updated may or may not exist in the local cache where the CacheWriter is |
| installed.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - an EntryEvent that provides information about the operation in progress</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></code> - if thrown will abort the operation in progress, and the exception |
| will be propagated back to caller that initiated the operation</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/Region.html#put-K-V-"><code>Region.put(Object, Object)</code></a>, |
| <a href="../../../../org/apache/geode/cache/Region.html#get-java.lang.Object-"><code>Region.get(Object)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="beforeCreate-org.apache.geode.cache.EntryEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>beforeCreate</h4> |
| <pre>void beforeCreate(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event) |
| throws <a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></pre> |
| <div class="block">Called before an entry is created. Entry creation is initiated by a <code>create</code>, a |
| <code>put</code>, or a <code>get</code>. The <code>CacheWriter</code> can determine whether |
| this value comes from a <code>get</code> or not by evaluating the |
| <a href="../../../../org/apache/geode/cache/CacheEvent.html#getOperation--"><code>Operation</code></a>'s <a href="../../../../org/apache/geode/cache/Operation.html#isLoad--"><code>Operation.isLoad()</code></a> method. The entry |
| being created may already exist in the local cache where this <code>CacheWriter</code> is |
| installed, but it does not yet exist in the cache where the operation was initiated.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - an EntryEvent that provides information about the operation in progress</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></code> - if thrown will abort the operation in progress, and the exception |
| will be propagated back to caller that initiated the operation</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/Region.html#create-K-V-"><code>Region.create(Object, Object)</code></a>, |
| <a href="../../../../org/apache/geode/cache/Region.html#put-K-V-"><code>Region.put(Object, Object)</code></a>, |
| <a href="../../../../org/apache/geode/cache/Region.html#get-java.lang.Object-"><code>Region.get(Object)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="beforeDestroy-org.apache.geode.cache.EntryEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>beforeDestroy</h4> |
| <pre>void beforeDestroy(<a href="../../../../org/apache/geode/cache/EntryEvent.html" title="interface in org.apache.geode.cache">EntryEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event) |
| throws <a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></pre> |
| <div class="block">Called before an entry is destroyed. The entry being destroyed may or may not exist in the |
| local cache where the CacheWriter is installed. This method is <em>not</em> called as a result |
| of expiration or <a href="../../../../org/apache/geode/cache/Region.html#localDestroy-java.lang.Object-"><code>Region.localDestroy(Object)</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - an EntryEvent that provides information about the operation in progress</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></code> - if thrown will abort the operation in progress, and the exception |
| will be propagated back to caller that initiated the operation</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/Region.html#destroy-java.lang.Object-"><code>Region.destroy(Object)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="beforeRegionDestroy-org.apache.geode.cache.RegionEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>beforeRegionDestroy</h4> |
| <pre>void beforeRegionDestroy(<a href="../../../../org/apache/geode/cache/RegionEvent.html" title="interface in org.apache.geode.cache">RegionEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event) |
| throws <a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></pre> |
| <div class="block">Called before a region is destroyed. The <code>CacheWriter</code> will not additionally be |
| called for each entry that is destroyed in the region as a result of a region destroy. If the |
| region's subregions have <code>CacheWriter</code>s installed, then they will be called for the |
| cascading subregion destroys. This method is <em>not</em> called as a result of |
| <a href="../../../../org/apache/geode/cache/Region.html#close--"><code>Region.close()</code></a>, <a href="../../../../org/apache/geode/cache/Cache.html#close-boolean-"><code>Cache.close(boolean)</code></a>, or <a href="../../../../org/apache/geode/cache/Region.html#localDestroyRegion--"><code>Region.localDestroyRegion()</code></a>. However, the |
| <a href="../../../../org/apache/geode/cache/Region.html#close--"><code>Region.close()</code></a> method is invoked regardless of whether a region is destroyed locally. A |
| non-local region destroy results in an invocation of this method is followed by |
| an invocation of <a href="../../../../org/apache/geode/cache/Region.html#close--"><code>Region.close()</code></a>. |
| <p> |
| WARNING: This method should not destroy or create any regions itself or a deadlock will occur.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - a RegionEvent that provides information about the operation</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></code> - if thrown, will abort the operation in progress, and the exception |
| will be propagated back to the caller that initiated the operation</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/Region.html#destroyRegion--"><code>Region.destroyRegion()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="beforeRegionClear-org.apache.geode.cache.RegionEvent-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>beforeRegionClear</h4> |
| <pre>void beforeRegionClear(<a href="../../../../org/apache/geode/cache/RegionEvent.html" title="interface in org.apache.geode.cache">RegionEvent</a><<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">K</a>,<a href="../../../../org/apache/geode/cache/CacheWriter.html" title="type parameter in CacheWriter">V</a>> event) |
| throws <a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></pre> |
| <div class="block">Called before a region is cleared. The <code>CacheWriter</code> will not additionally be called |
| for each entry that is cleared in the region as a result of a region clear. |
| |
| <p> |
| WARNING: This method should not clear/destroy any regions</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>event</code> - a RegionEvent that provides information about the operation</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheWriterException.html" title="class in org.apache.geode.cache">CacheWriterException</a></code> - if thrown, will abort the operation in progress, and the exception |
| will be propagated back to the caller that initiated the operation</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/Region.html#clear--"><code>Region.clear()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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