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<div class="subTitle">org.apache.ignite.cache.affinity</div>
<h2 title="Interface AffinityFunctionContext" class="title">Interface AffinityFunctionContext</h2>
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<pre>public interface <span class="strong">AffinityFunctionContext</span></pre>
<div class="block">Affinity function context. This context is passed to <a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunction.html" title="interface in org.apache.ignite.cache.affinity"><code>AffinityFunction</code></a> for
partition reassignment on every topology change event.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunctionContext.html#backups()">backups</a></strong>()</code>
<div class="block">Gets number of backups for new assignment.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunctionContext.html#currentTopologySnapshot()">currentTopologySnapshot</a></strong>()</code>
<div class="block">Gets current topology snapshot.</div>
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<td class="colFirst"><code>org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunctionContext.html#currentTopologyVersion()">currentTopologyVersion</a></strong>()</code>
<div class="block">Gets current topology version number.</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/ignite/events/DiscoveryEvent.html" title="class in org.apache.ignite.events">DiscoveryEvent</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunctionContext.html#discoveryEvent()">discoveryEvent</a></strong>()</code>
<div class="block">Gets discovery event caused topology change.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/ignite/cache/affinity/AffinityFunctionContext.html#previousAssignment(int)">previousAssignment</a></strong>(int&nbsp;part)</code>
<div class="block">Gets affinity assignment for given partition on previous topology version.</div>
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<pre>@Nullable
<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;&nbsp;previousAssignment(int&nbsp;part)</pre>
<div class="block">Gets affinity assignment for given partition on previous topology version. First node in returned list is
a primary node, other nodes are backups.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>part</code> - Partition to get previous assignment for.</dd>
<dt><span class="strong">Returns:</span></dt><dd>List of nodes assigned to given partition on previous topology version or <code>null</code>
if this information is not available.</dd></dl>
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<h4>backups</h4>
<pre>int&nbsp;backups()</pre>
<div class="block">Gets number of backups for new assignment.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Number of backups for new assignment.</dd></dl>
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<h4>currentTopologySnapshot</h4>
<pre><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a>&gt;&nbsp;currentTopologySnapshot()</pre>
<div class="block">Gets current topology snapshot. Snapshot will contain only nodes on which particular cache is configured.
List of passed nodes is guaranteed to be sorted in a same order on all nodes on which partition assignment
is performed.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Cache topology snapshot.</dd></dl>
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<h4>currentTopologyVersion</h4>
<pre>org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion&nbsp;currentTopologyVersion()</pre>
<div class="block">Gets current topology version number.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Current topology version number.</dd></dl>
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<h4>discoveryEvent</h4>
<pre>@Nullable
<a href="../../../../../org/apache/ignite/events/DiscoveryEvent.html" title="class in org.apache.ignite.events">DiscoveryEvent</a>&nbsp;discoveryEvent()</pre>
<div class="block">Gets discovery event caused topology change.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Discovery event caused latest topology change or <code>null</code> if this information is
not available.</dd></dl>
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