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| <div class="subTitle">org.apache.ignite.configuration</div> |
| <h2 title="Interface TopologyValidator" class="title">Interface TopologyValidator</h2> |
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| <pre>public interface <span class="typeNameLabel">TopologyValidator</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">Topology validator is used to verify that cluster topology is valid for further cache operations. |
| The topology validator is invoked every time the cluster topology changes (either a new node joined |
| or an existing node failed or left). |
| <p> |
| If topology validator is not configured, then the cluster topology is always considered to be valid. |
| <p> |
| Whenever the <a href="../../../../org/apache/ignite/configuration/TopologyValidator.html#validate-java.util.Collection-"><code>validate(Collection)</code></a> method returns <code>true</code>, then the topology is considered valid |
| for a certain cache and all operations on this cache will be allowed to proceed. Otherwise, all update operations |
| on the cache are restricted with the following exceptions: |
| <ul> |
| <li><code>CacheException</code> will be thrown for all update operations (put, remove, etc) attempt.</li> |
| <li><a href="../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite"><code>IgniteException</code></a> will be thrown for the transaction commit attempt.</li> |
| </ul> |
| After returning <code>false</code> and declaring the topology not valid, the topology validator can return |
| to normal state whenever the next topology change happens. |
| <h1 class="header">Example</h1> |
| The example below shows how a validator can be used to allow cache updates only in case if the cluster |
| topology contains exactly 2 nodes: |
| <pre name="code" class="java"> |
| new TopologyValidator() { |
| public boolean validate(Collection<ClusterNode> nodes) { |
| return nodes.size() == 2; |
| } |
| } |
| </pre> |
| <h1 class="header">Configuration</h1> |
| The topology validator can be configured either from code or XML via |
| <a href="../../../../org/apache/ignite/configuration/CacheConfiguration.html#setTopologyValidator-org.apache.ignite.configuration.TopologyValidator-"><code>CacheConfiguration.setTopologyValidator(TopologyValidator)</code></a> method.</div> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/configuration/TopologyValidator.html#validate-java.util.Collection-">validate</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span> nodes)</code> |
| <div class="block">Validates topology.</div> |
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| <h4>validate</h4> |
| <pre>boolean validate(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/cluster/ClusterNode.html" title="interface in org.apache.ignite.cluster">ClusterNode</a><span class='angle_bracket'>></span> nodes)</pre> |
| <div class="block">Validates topology.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nodes</code> - Collection of nodes.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> in case topology is valid for specific cache, otherwise <code>false</code></dd> |
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| <p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2021 Copyright © Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Database and Caching Platform</b> </td> <td>: ver. <strong>2.11.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: September 11 2021 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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