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<div class="subTitle">org.apache.storm.metricstore.rocksdb</div>
<h2 title="Class StringMetadataCache" class="title">Class StringMetadataCache</h2>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">ReadOnlyStringMetadataCache</a>, <a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">WritableStringMetadataCache</a>, <a href="../../../../../org/apache/storm/utils/LruMap.CacheEvictionCallback.html" title="interface in org.apache.storm.utils">LruMap.CacheEvictionCallback</a>&lt;<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>,org.apache.storm.metricstore.rocksdb.StringMetadata&gt;</dd>
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<pre>public class <span class="typeNameLabel">StringMetadataCache</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../../org/apache/storm/utils/LruMap.CacheEvictionCallback.html" title="interface in org.apache.storm.utils">LruMap.CacheEvictionCallback</a>&lt;<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>,org.apache.storm.metricstore.rocksdb.StringMetadata&gt;, <a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">WritableStringMetadataCache</a>, <a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">ReadOnlyStringMetadataCache</a></pre>
<div class="block"><p>Class to create a use a cache that stores Metadata string information in memory. It allows searching for a Metadata string&rsquo;s unique id, or looking up the string by the unique id. The StringMetadata is stored in an LRU map. When an entry is added to the cache, an older entry may be evicted, which then needs to be immediately stored to the database to provide a consistent view of all the metadata strings.</p><p><p>All write operations adding metadata to RocksDB are done by a single thread (a RocksDbMetricsWriter), but multiple threads can read values from the cache. To clarify which permissions are accessible by various threads, the ReadOnlyStringMetadataCache and WritableStringMetadataCache are provided to be used.</p></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/metricstore/rocksdb/StringMetadataCache.html#contains-java.lang.Integer-">contains</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&nbsp;stringId)</code>
<div class="block">Determines if a string Id is contained in the cache.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a>&lt;<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>,org.apache.storm.metricstore.rocksdb.StringMetadata&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/metricstore/rocksdb/StringMetadataCache.html#entrySet--">entrySet</a></span>()</code>
<div class="block">Get the map of the cache contents.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/metricstore/rocksdb/StringMetadataCache.html#evictionCallback-java.lang.String-org.apache.storm.metricstore.rocksdb.StringMetadata-">evictionCallback</a></span>(<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>&nbsp;key,
org.apache.storm.metricstore.rocksdb.StringMetadata&nbsp;val)</code>
<div class="block">Callback when data is about to be removed from the cache.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>org.apache.storm.metricstore.rocksdb.StringMetadata</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/metricstore/rocksdb/StringMetadataCache.html#get-java.lang.String-">get</a></span>(<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>&nbsp;s)</code>
<div class="block">Get the string metadata from the cache.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><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/metricstore/rocksdb/StringMetadataCache.html#getMetadataString-java.lang.Integer-">getMetadataString</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&nbsp;stringId)</code>
<div class="block">Returns the string matching the string Id if in the cache.</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/metricstore/rocksdb/StringMetadataCache.html#put-java.lang.String-org.apache.storm.metricstore.rocksdb.StringMetadata-boolean-">put</a></span>(<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>&nbsp;s,
org.apache.storm.metricstore.rocksdb.StringMetadata&nbsp;stringMetadata,
boolean&nbsp;newEntry)</code>
<div class="block">Add the string metadata to the cache.</div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>get</h4>
<pre>public&nbsp;org.apache.storm.metricstore.rocksdb.StringMetadata&nbsp;get(<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>&nbsp;s)</pre>
<div class="block"><p>Get the string metadata from the cache.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html#get-java.lang.String-">get</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">ReadOnlyStringMetadataCache</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>s</code> - The string to look for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the metadata associated with the string or null if not found</dd>
</dl>
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<h4>put</h4>
<pre>public&nbsp;void&nbsp;put(<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>&nbsp;s,
org.apache.storm.metricstore.rocksdb.StringMetadata&nbsp;stringMetadata,
boolean&nbsp;newEntry)
throws <a href="../../../../../org/apache/storm/metricstore/MetricException.html" title="class in org.apache.storm.metricstore">MetricException</a></pre>
<div class="block"><p>Add the string metadata to the cache.</p><p><p>NOTE: this can cause data to be evicted from the cache when full. When this occurs, the evictionCallback() method is called to store the metadata back into the RocksDB database.</p><p><p>This method is only exposed to the WritableStringMetadataCache interface.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html#put-java.lang.String-org.apache.storm.metricstore.rocksdb.StringMetadata-boolean-">put</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">WritableStringMetadataCache</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>s</code> - The string to add</dd>
<dd><code>stringMetadata</code> - The string&rsquo;s metadata</dd>
<dd><code>newEntry</code> - Indicates the metadata is being used for the first time and should be written to RocksDB immediately</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/MetricException.html" title="class in org.apache.storm.metricstore">MetricException</a></code> - when evicted data fails to save to the database or when the database is shutdown</dd>
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<h4>evictionCallback</h4>
<pre>public&nbsp;void&nbsp;evictionCallback(<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>&nbsp;key,
org.apache.storm.metricstore.rocksdb.StringMetadata&nbsp;val)</pre>
<div class="block"><p>Callback when data is about to be removed from the cache. This method then immediately writes the metadata to RocksDB.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/utils/LruMap.CacheEvictionCallback.html#evictionCallback-K-V-">evictionCallback</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/utils/LruMap.CacheEvictionCallback.html" title="interface in org.apache.storm.utils">LruMap.CacheEvictionCallback</a>&lt;<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>,org.apache.storm.metricstore.rocksdb.StringMetadata&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - The evicted string</dd>
<dd><code>val</code> - The evicted string&rsquo;s metadata</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</a></code> - when evicted data fails to save to the database</dd>
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<h4>contains</h4>
<pre>public&nbsp;boolean&nbsp;contains(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&nbsp;stringId)</pre>
<div class="block"><p>Determines if a string Id is contained in the cache.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html#contains-java.lang.Integer-">contains</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">ReadOnlyStringMetadataCache</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stringId</code> - The string Id to check</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the Id is in the cache, false otherwise</dd>
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<h4>getMetadataString</h4>
<pre>public&nbsp;<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>&nbsp;getMetadataString(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&nbsp;stringId)</pre>
<div class="block"><p>Returns the string matching the string Id if in the cache.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html#getMetadataString-java.lang.Integer-">getMetadataString</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/metricstore/rocksdb/ReadOnlyStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">ReadOnlyStringMetadataCache</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stringId</code> - The string Id to check</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the associated string if the Id is in the cache, null otherwise</dd>
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<h4>entrySet</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a>&lt;<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>,org.apache.storm.metricstore.rocksdb.StringMetadata&gt;&gt;&nbsp;entrySet()</pre>
<div class="block"><p>Get the map of the cache contents. Provided to allow writing the data to RocksDB on shutdown.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html#entrySet--">entrySet</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/storm/metricstore/rocksdb/WritableStringMetadataCache.html" title="interface in org.apache.storm.metricstore.rocksdb">WritableStringMetadataCache</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the string metadata map entrySet</dd>
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