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<div class="subTitle">org.janusgraph.diskstorage.keycolumnvalue</div>
<h2 title="Class KCVSProxy" class="title">Class KCVSProxy</h2>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/janusgraph/diskstorage/locking/consistentkey/ExpectedValueCheckingStore.html" title="class in org.janusgraph.diskstorage.locking.consistentkey">ExpectedValueCheckingStore</a>, <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/cache/KCVSCache.html" title="class in org.janusgraph.diskstorage.keycolumnvalue.cache">KCVSCache</a>, <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/ttl/TTLKCVS.html" title="class in org.janusgraph.diskstorage.keycolumnvalue.ttl">TTLKCVS</a></dd>
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<pre>public class <span class="typeNameLabel">KCVSProxy</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/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></pre>
<div class="block">Wraps a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeyColumnValueStore</code></a> as a proxy as a basis for
other wrappers</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Matthias Br&ouml;cheler (me@matthiasb.com);</dd>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#store">store</a></span></code>&nbsp;</td>
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<h3>Fields inherited from interface&nbsp;org.janusgraph.diskstorage.keycolumnvalue.<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></h3>
<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#NO_ADDITIONS">NO_ADDITIONS</a>, <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#NO_DELETIONS">NO_DELETIONS</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#KCVSProxy-org.janusgraph.diskstorage.keycolumnvalue.KeyColumnValueStore-">KCVSProxy</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a>&nbsp;store)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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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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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">acquireLock</a></span>(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;key,
<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;column,
<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;expectedValue,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Attempts to claim a lock on the value at the specified <code>key</code> and
<code>column</code> pair.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#close--">close</a></span>()</code>
<div class="block">Closes this store</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.KeyRangeQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyRangeQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeyRangeQuery</a>&nbsp;keyQuery,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeyIterator</code></a> over all keys that fall within the key-range specified by the given query and have one or more columns matching the column-range.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySlicesIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeySlicesIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.MultiSlicesQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiSlicesQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiSlicesQuery</a>&nbsp;queries,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySlicesIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeySlicesIterator</code></a> over all keys in the store that have one or more columns matching the column-range.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyIterator</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&nbsp;columnQuery,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeyIterator</code></a> over all keys in the store that have one or more columns matching the column-range.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>,<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a>&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getMultiSlices-org.janusgraph.diskstorage.keycolumnvalue.MultiKeysQueryGroups-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getMultiSlices</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiKeysQueryGroups.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiKeysQueryGroups</a>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&nbsp;multiKeysQueryGroups,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Retrieves the list of entries (i.e.</div>
</td>
</tr>
<tr id="i6" 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/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getName--">getName</a></span>()</code>
<div class="block">Returns the name of this store.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getSlice-org.janusgraph.diskstorage.keycolumnvalue.KeySliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getSlice</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeySliceQuery</a>&nbsp;query,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Retrieves the list of entries (i.e.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#getSlice-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getSlice</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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&gt;&nbsp;keys,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&nbsp;query,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Retrieves the list of entries (i.e.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#mutate-org.janusgraph.diskstorage.StaticBuffer-java.util.List-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">mutate</a></span>(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;key,
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/Entry.html" title="interface in org.janusgraph.diskstorage">Entry</a>&gt;&nbsp;additions,
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&gt;&nbsp;deletions,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>
<div class="block">Verifies acquisition of locks <code>txh</code> from previous calls to
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>KeyColumnValueStore.acquireLock(StaticBuffer, StaticBuffer, StaticBuffer, StoreTransaction)</code></a>
, then writes supplied <code>additions</code> and/or <code>deletions</code> to
<code>key</code> in the underlying data store.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KCVSProxy.html#unwrapTx-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">unwrapTx</a></span>(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</code>&nbsp;</td>
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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>store</h4>
<pre>protected final&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a> store</pre>
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<pre>public&nbsp;KCVSProxy(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a>&nbsp;store)</pre>
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<pre>protected&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;unwrapTx(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)</pre>
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#close--">KeyColumnValueStore</a></code></span></div>
<div class="block">Closes this store</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#close--">close</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
</ul>
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<h4>acquireLock</h4>
<pre>public&nbsp;void&nbsp;acquireLock(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;key,
<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;column,
<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;expectedValue,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Attempts to claim a lock on the value at the specified <code>key</code> and
<code>column</code> pair. These locks are discretionary.
<p>
<p>
<p>
If locking fails, implementations of this method may, but are not
required to, throw <a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking"><code>PermanentLockingException</code></a>.
This method is not required
to determine whether locking actually succeeded and may return without
throwing an exception even when the lock can't be acquired. Lock
acquisition is only only guaranteed to be verified by the first call to
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#mutate-org.janusgraph.diskstorage.StaticBuffer-java.util.List-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>KeyColumnValueStore.mutate(StaticBuffer, List, List, StoreTransaction)</code></a> on any given
<code>txh</code>.
<p>
<p>
<p>
The <code>expectedValue</code> must match the actual value present at the
<code>key</code> and <code>column</code> pair. If the true value does not match the
<code>expectedValue</code>, the lock attempt fails and
<code>LockingException</code> is thrown. This method may check
<code>expectedValue</code>. The <code>mutate()</code> mutate is required to check
it.
<p>
<p>
<p>
When this method is called multiple times on the same <code>key</code>,
<code>column</code>, and <code>txh</code>, calls after the first have no effect.
<p>
<p>
<p>
Locks acquired by this method must be automatically released on
transaction <code>commit()</code> or <code>rollback()</code>.
<p>
<p>
<p>
Implementations which don't support locking should throw
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang"><code>UnsupportedOperationException</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">acquireLock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key on which to lock</dd>
<dd><code>column</code> - the column on which to lock</dd>
<dd><code>expectedValue</code> - the expected value for the specified key-column pair on which
to lock (null means the pair must have no value)</dd>
<dd><code>txh</code> - the transaction to use</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></code> - the lock could not be acquired due to contention with other
transactions or a locking-specific storage problem</dd>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
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<h4>getKeys</h4>
<pre>public&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyIterator</a>&nbsp;getKeys(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyRangeQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeyRangeQuery</a>&nbsp;keyQuery,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.KeyRangeQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeyIterator</code></a> over all keys that fall within the key-range specified by the given query and have one or more columns matching the column-range.
Calling <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html#getEntries--"><code>KeyIterator.getEntries()</code></a> returns the list of all entries that match the column-range specified by the given query.
<p>
This method is only supported by stores which keep keys in byte-order.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.KeyRangeQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyIterator</a>&nbsp;getKeys(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&nbsp;columnQuery,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeyIterator</code></a> over all keys in the store that have one or more columns matching the column-range. Calling <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyIterator.html#getEntries--"><code>KeyIterator.getEntries()</code></a>
returns the list of all entries that match the column-range specified by the given query.
<p>
This method is only supported by stores which do not keep keys in byte-order.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySlicesIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeySlicesIterator</a>&nbsp;getKeys(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiSlicesQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiSlicesQuery</a>&nbsp;queries,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.MultiSlicesQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Returns a <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySlicesIterator.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue"><code>KeySlicesIterator</code></a> over all keys in the store that have one or more columns matching the column-range. Calling <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySlicesIterator.html#getEntries--"><code>KeySlicesIterator.getEntries()</code></a>
returns the map of all entries that match the column-range specified by the given queries.
<p>
This method is mandatory for stores which do not guaranty key orders while running parallel scans.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getKeys-org.janusgraph.diskstorage.keycolumnvalue.MultiSlicesQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getKeys</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
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<h4>getName</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;getName()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getName--">KeyColumnValueStore</a></code></span></div>
<div class="block">Returns the name of this store. Each store has a unique name which is used to open it.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getName--">getName</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>store name</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStoreManager.html#openDatabase-java.lang.String-"><code>KeyColumnValueStoreManager.openDatabase(String)</code></a></dd>
</dl>
</li>
</ul>
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<h4>mutate</h4>
<pre>public&nbsp;void&nbsp;mutate(<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&nbsp;key,
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/Entry.html" title="interface in org.janusgraph.diskstorage">Entry</a>&gt;&nbsp;additions,
<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&gt;&nbsp;deletions,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#mutate-org.janusgraph.diskstorage.StaticBuffer-java.util.List-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Verifies acquisition of locks <code>txh</code> from previous calls to
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>KeyColumnValueStore.acquireLock(StaticBuffer, StaticBuffer, StaticBuffer, StoreTransaction)</code></a>
, then writes supplied <code>additions</code> and/or <code>deletions</code> to
<code>key</code> in the underlying data store. Deletions are applied strictly
before additions. In other words, if both an addition and deletion are
supplied for the same column, then the column will first be deleted and
then the supplied Entry for the column will be added.
<p>
<p>
<p>
Implementations which don't support locking should skip the initial lock
verification step but otherwise behave as described above.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#mutate-org.janusgraph.diskstorage.StaticBuffer-java.util.List-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">mutate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key under which the columns in <code>additions</code> and
<code>deletions</code> will be written</dd>
<dd><code>additions</code> - the list of Entry instances representing column-value pairs to
create under <code>key</code>, or null to add no column-value pairs</dd>
<dd><code>deletions</code> - the list of columns to delete from <code>key</code>, or null to
delete no columns</dd>
<dd><code>txh</code> - the transaction to use</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/locking/PermanentLockingException.html" title="class in org.janusgraph.diskstorage.locking">PermanentLockingException</a></code> - if locking is supported by the implementation and at least
one lock acquisition attempted by
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#acquireLock-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.StaticBuffer-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>KeyColumnValueStore.acquireLock(StaticBuffer, StaticBuffer, StaticBuffer, StoreTransaction)</code></a>
has failed</dd>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
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<h4>getSlice</h4>
<pre>public&nbsp;<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a>&nbsp;getSlice(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">KeySliceQuery</a>&nbsp;query,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getSlice-org.janusgraph.diskstorage.keycolumnvalue.KeySliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Retrieves the list of entries (i.e. column-value pairs) for a specified query.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getSlice-org.janusgraph.diskstorage.keycolumnvalue.KeySliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getSlice</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>query</code> - Query to get results for</dd>
<dd><code>txh</code> - Transaction</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of entries up to a maximum of "limit" entries</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code> - when columnEnd &lt; columnStart</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeySliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>KeySliceQuery</code></a></dd>
</dl>
</li>
</ul>
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<h4>getSlice</h4>
<pre>public&nbsp;<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a>&gt;&nbsp;getSlice(<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>&gt;&nbsp;keys,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&nbsp;query,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getSlice-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Retrieves the list of entries (i.e. column-value pairs) as specified by the given <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a> for all
of the given keys together.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getSlice-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getSlice</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>keys</code> - List of keys</dd>
<dd><code>query</code> - Slicequery specifying matching entries</dd>
<dd><code>txh</code> - Transaction</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The result of the query for each of the given keys as a map from the key to the list of result entries.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
</li>
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<h4>getMultiSlices</h4>
<pre>public&nbsp;<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>&lt;<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>,<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>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage">EntryList</a>&gt;&gt;&nbsp;getMultiSlices(<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/MultiKeysQueryGroups.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">MultiKeysQueryGroups</a>&lt;<a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a>,<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue">SliceQuery</a>&gt;&nbsp;multiKeysQueryGroups,
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/StoreTransaction.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">StoreTransaction</a>&nbsp;txh)
throws <a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getMultiSlices-org.janusgraph.diskstorage.keycolumnvalue.MultiKeysQueryGroups-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">KeyColumnValueStore</a></code></span></div>
<div class="block">Retrieves the list of entries (i.e. column-value pairs) for each provided <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a> for all respective given keys together.
<br>
The default implementation of this method is not optimized and instead uses blocking calls for each separate
<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a> via <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getSlice-java.util.List-org.janusgraph.diskstorage.keycolumnvalue.SliceQuery-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-"><code>KeyColumnValueStore.getSlice(List, SliceQuery, StoreTransaction)</code></a>.
<br>
It is highly advisable to overwrite this implementation and use optimized implementation which requests all Slice queries in parallel
by using asynchronous slice queries evaluation / grouped slice queries evaluation / parallel slice queries evaluation using a thread pool or any other
optimized queries evaluation which can retrieve results for all requested queries (<a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a>) in the
shortest time possible.
<br>
Backend implementations which are not using blocking IO calls to the underlying storage backend (i.e. `in-memory` storage implementation)
don't need to overwrite or optimized this method because both parallelized implementation and a sequential implementation
will be performed the same for such storage implementations.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html#getMultiSlices-org.janusgraph.diskstorage.keycolumnvalue.MultiKeysQueryGroups-org.janusgraph.diskstorage.keycolumnvalue.StoreTransaction-">getMultiSlices</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/KeyColumnValueStore.html" title="interface in org.janusgraph.diskstorage.keycolumnvalue">KeyColumnValueStore</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>multiKeysQueryGroups</code> - List of Tuples where key is a List of <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a> queries which has
to be performed and a value is a list of keys for which all the queries have
to be performed.</dd>
<dd><code>txh</code> - Transaction</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The result of the query for each of the given <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a> and each of the given key.
<a href="../../../../org/janusgraph/diskstorage/EntryList.html" title="interface in org.janusgraph.diskstorage"><code>EntryList</code></a> result should be provided for each of the <a href="../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage"><code>StaticBuffer</code></a> of each of the <a href="../../../../org/janusgraph/diskstorage/keycolumnvalue/SliceQuery.html" title="class in org.janusgraph.diskstorage.keycolumnvalue"><code>SliceQuery</code></a>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/janusgraph/diskstorage/BackendException.html" title="class in org.janusgraph.diskstorage">BackendException</a></code></dd>
</dl>
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