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| <h2 title="Interface Metadata" class="title">Interface Metadata</h2> |
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| <pre>public interface <span class="typeNameLabel">Metadata</span></pre> |
| <div class="block">Provides Metastore component implementation metadata, |
| including information about versioning support if any |
| and current properties applicable to the Metastore component instance.</div> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/metastore/operate/Metadata.html#UNDEFINED">UNDEFINED</a></span></code> </td> |
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| <td class="colFirst"><code>default <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/drill/metastore/operate/Metadata.html#properties--">properties</a></span>()</code> |
| <div class="block">Depending on Metastore component implementation, it may have properties.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/metastore/operate/Metadata.html#supportsVersioning--">supportsVersioning</a></span>()</code> |
| <div class="block">Indicates if Metastore component supports versioning, |
| i.e.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>default long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/metastore/operate/Metadata.html#version--">version</a></span>()</code> |
| <div class="block">Depending on Metastore component implementation, it may have version which can be used to determine |
| if anything has changed during last call to the Metastore component.</div> |
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| <pre>static final int UNDEFINED</pre> |
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| <h4>supportsVersioning</h4> |
| <pre>boolean supportsVersioning()</pre> |
| <div class="block">Indicates if Metastore component supports versioning, |
| i.e. Metastore component version is changed each time write operation is executed.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if Metastore component supports versioning, false otherwise</dd> |
| </dl> |
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| <h4>version</h4> |
| <pre>default long version()</pre> |
| <div class="block">Depending on Metastore component implementation, it may have version which can be used to determine |
| if anything has changed during last call to the Metastore component. |
| If Metastore component implementation, supports versioning, |
| version is changed each time Metastore component data has changed. |
| <a href="../../../../../org/apache/drill/metastore/operate/Metadata.html#supportsVersioning--"><code>supportsVersioning()</code></a> indicates if Metastore component supports versioning. |
| If versioning is not supported, <a href="../../../../../org/apache/drill/metastore/operate/Metadata.html#UNDEFINED"><code>UNDEFINED</code></a> is returned.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>current metastore version</dd> |
| </dl> |
| </li> |
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| <h4>properties</h4> |
| <pre>default <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>> properties()</pre> |
| <div class="block">Depending on Metastore component implementation, it may have properties. |
| If Metastore component supports properties, map with properties names and values are returned, |
| otherwise empty map is returned.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Metastore component implementation properties</dd> |
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