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| <div class="subTitle">org.apache.ignite.cache.affinity</div> |
| <h2 title="Interface AffinityKeyMapper" class="title">Interface AffinityKeyMapper</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd>org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper, <a href="../../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html" title="class in org.apache.ignite.igfs">IgfsGroupDataBlocksKeyMapper</a></dd> |
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| <pre>public interface <span class="strong">AffinityKeyMapper</span> |
| extends <a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">Affinity mapper which maps cache key to an affinity key. Affinity key is a key which will be |
| used to determine a node on which this key will be cached. Every cache key will first be passed |
| through <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#affinityKey(java.lang.Object)"><code>affinityKey(Object)</code></a> method, and the returned value of this method |
| will be given to <a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunction.html" title="interface in org.apache.ignite.cache.affinity"><code>AffinityFunction</code></a> implementation to find out key-to-node affinity. |
| <p> |
| The default implementation, which will be used if no explicit affinity mapper is specified |
| in cache configuration, will first look for any field or method annotated with |
| <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapped.html" title="annotation in org.apache.ignite.cache.affinity"><code>@AffinityKeyMapped</code></a> annotation. If such field or method |
| is not found, then the cache key itself will be returned from <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#affinityKey(java.lang.Object)"><code>affinityKey(Object)</code></a> |
| method (this means that all objects with the same cache key will always be routed to the same node). |
| If such field or method is found, then the value of this field or method will be returned from |
| <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#affinityKey(java.lang.Object)"><code>affinityKey(Object)</code></a> method. This allows to specify alternate affinity key, other |
| than the cache key itself, whenever needed. |
| <p> |
| A custom (other than default) affinity mapper can be provided |
| via <a href="../../../../../org/apache/ignite/configuration/CacheConfiguration.html#getAffinityMapper()"><code>CacheConfiguration.getAffinityMapper()</code></a> configuration property. |
| <p> |
| For more information on affinity mapping and examples refer to <a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunction.html" title="interface in org.apache.ignite.cache.affinity"><code>AffinityFunction</code></a> and |
| <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapped.html" title="annotation in org.apache.ignite.cache.affinity"><code>@AffinityKeyMapped</code></a> documentation.</div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunction.html" title="interface in org.apache.ignite.cache.affinity"><code>AffinityFunction</code></a>, |
| <a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapped.html" title="annotation in org.apache.ignite.cache.affinity"><code>AffinityKeyMapped</code></a></dd></dl> |
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| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#affinityKey(java.lang.Object)">affinityKey</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> key)</code> |
| <div class="block">Maps passed in key to an alternate key which will be used for node affinity.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#reset()">reset</a></strong>()</code> |
| <div class="block">Resets cache affinity mapper to its initial state.</div> |
| </td> |
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| <h4>affinityKey</h4> |
| <pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> affinityKey(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> key)</pre> |
| <div class="block">Maps passed in key to an alternate key which will be used for node affinity.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key to map.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>Key to be used for node-to-affinity mapping (may be the same |
| key as passed in).</dd></dl> |
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| <h4>reset</h4> |
| <pre>void reset()</pre> |
| <div class="block">Resets cache affinity mapper to its initial state. This method will be called by |
| the system any time the affinity mapper has been sent to remote node where |
| it has to be reinitialized. If your implementation of affinity mapper |
| has no initialization logic, leave this method empty.</div> |
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