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| <h2 title="Interface DNSToSwitchMapping" class="title">Interface DNSToSwitchMapping</h2> |
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| <pre>public interface <span class="typeNameLabel">DNSToSwitchMapping</span></pre> |
| <div class="block"><p>An interface that must be implemented to allow pluggable DNS-name/IP-address to RackID resolvers.</p></div> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/storm/networktopography/DNSToSwitchMapping.html#DEFAULT_RACK">DEFAULT_RACK</a></span></code> </td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/storm/networktopography/DNSToSwitchMapping.html#resolve-java.util.List-">resolve</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> names)</code> |
| <div class="block">Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths).</div> |
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| <pre>static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> DEFAULT_RACK</pre> |
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| <h4>resolve</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> resolve(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> names)</pre> |
| <div class="block"><p>Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths). Consider an element in the argument list - x.y.com. The switch information that is returned must be a network path of the form /foo/rack, where / is the root, and ‘foo’ is the switch where ‘rack’ is connected. Note the hostname/ip-address is not part of the returned path. The network topology of the cluster would determine the number of components in the network path.</p><p><p>If a name cannot be resolved to a rack, the implementation should return {DEFAULT_RACK}. This is what the bundled implementations do, though it is not a formal requirement.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>names</code> - the list of hosts to resolve (can be empty)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Map of hosts to resolved network paths. If <i>names</i> is empty, then return empty Map</dd> |
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