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<div class="subTitle">org.janusgraph.graphdb.database.cache</div>
<h2 title="Interface CacheInvalidationService" class="title">Interface CacheInvalidationService</h2>
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<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/janusgraph/graphdb/database/cache/KCVSCacheInvalidationService.html" title="class in org.janusgraph.graphdb.database.cache">KCVSCacheInvalidationService</a></dd>
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<pre>public interface <span class="typeNameLabel">CacheInvalidationService</span></pre>
<div class="block">Cache invalidation service for manual JanusGraph database-level cache invalidation.
Use with great care because improper invalidation may result in stale data left in db-cache.
This service wraps two different caches called as `edgeStore` and `indexStore` which form a
single database-level cache (can be enabled via `cache.db-cache` configuration property).
When db-cache is disabled this service doesn't make any effective changes because the cache is
fully disabled in that case.
<p>
This class provides method for data invalidation for both `edgeStore` cache and `indexStore` cache
but invalidating entries in one cache doesn't invalidate entries in another cache.
Thus, for proper invalidation you need to invalidate necessary keys for both `edgeStore` and `indexStore`.
<p>
EdgeStore accepts keys where a key is an encoded vertex id. It's usually easy to invalidate EdgeStore because
it doesn't require you to know more information to form a key except knowing a vertex id.
<p>
IndexStore accepts keys where a key is an encoded IndexUpdate key. To form IndexUpdate key you need to know
the next information: vertex id, updated property name, previous property value and / or new property value.
Thus forming IndexUpdate key to invalidate IndexStore may be more complicated.
<p>
EdgeStore caches properties and edges for vertices.
IndexStore caches results for queries which use indices.
<p>
See JavaDoc on methods to learn how to properly form a `key` to invalidate cache in `edgeStore` or `indexStore`.</div>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#clearDBCache--">clearDBCache</a></span>()</code>
<div class="block">Clears both `edgeStore` cache and `indexStore` cache fully.</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/graphdb/database/cache/CacheInvalidationService.html#clearEdgeStoreCache--">clearEdgeStoreCache</a></span>()</code>
<div class="block">Clears `edgeStore` cache fully</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/janusgraph/graphdb/database/cache/CacheInvalidationService.html#clearIndexStoreCache--">clearIndexStoreCache</a></span>()</code>
<div class="block">Clears `indexStore` cache fully</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceClearExpiredKeysInEdgeStoreCache--">forceClearExpiredKeysInEdgeStoreCache</a></span>()</code>
<div class="block">Instead of waiting for a probabilistic invalidation it triggers all cached queries scan and invalidation in `edgeStore`.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceClearExpiredKeysInIndexStoreCache--">forceClearExpiredKeysInIndexStoreCache</a></span>()</code>
<div class="block">Instead of waiting for a probabilistic invalidation it triggers all cached queries scan and invalidation in `indexStore`.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceInvalidateVertexInEdgeStoreCache-java.lang.Object-">forceInvalidateVertexInEdgeStoreCache</a></span>(<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> vertexId)</code>
<div class="block">Marks a vertex as expired in `edgeStore` cache (<a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a>) and triggers force
clear of expired cache (i.e.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceInvalidateVerticesInEdgeStoreCache-java.lang.Iterable-">forceInvalidateVerticesInEdgeStoreCache</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<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>> vertexIds)</code>
<div class="block">Marks vertices as expired in `edgeStore` cache (<a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a>) and triggers force
clear of expired cache (i.e.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markKeyAsExpiredInEdgeStore-org.janusgraph.diskstorage.StaticBuffer-">markKeyAsExpiredInEdgeStore</a></span>(<a href="../../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> key)</code>
<div class="block">Marks specific key as expired in `edgeStore` cache.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markKeyAsExpiredInIndexStore-org.janusgraph.diskstorage.StaticBuffer-">markKeyAsExpiredInIndexStore</a></span>(<a href="../../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> key)</code>
<div class="block">Marks specific key as expired in `indexStore` cache.</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/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-">markVertexAsExpiredInEdgeStore</a></span>(<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> vertexId)</code>
<div class="block">Marks specific vertex as expired in `edgeStore` cache.</div>
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<h3>Method Detail</h3>
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<h4>markVertexAsExpiredInEdgeStore</h4>
<pre>void markVertexAsExpiredInEdgeStore(<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> vertexId)</pre>
<div class="block">Marks specific vertex as expired in `edgeStore` cache.
It will make sure that any retrieved properties and edges associated with this vertex will be invalidated in vertex cache.
<p>
Warning! This doesn't invalidate `indexStore` cache. Thus, any queries which are using indices may still return
stale data. See <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markKeyAsExpiredInIndexStore-org.janusgraph.diskstorage.StaticBuffer-"><code>markKeyAsExpiredInIndexStore(StaticBuffer)</code></a> JavaDoc to learn how to invalidate data for
`indexStore`.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vertexId</code> - vertex id to expire in `edgeStore` cache</dd>
</dl>
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<h4>markKeyAsExpiredInEdgeStore</h4>
<pre>void markKeyAsExpiredInEdgeStore(<a href="../../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> key)</pre>
<div class="block">Marks specific key as expired in `edgeStore` cache.
It will make sure that any retrieved properties and edges associated with this key will be invalidated in vertex cache.
<p>
Warning! This doesn't invalidate `indexStore` cache. Thus, any queries which are using indices may still return
stale data. See <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markKeyAsExpiredInIndexStore-org.janusgraph.diskstorage.StaticBuffer-"><code>markKeyAsExpiredInIndexStore(StaticBuffer)</code></a> JavaDoc to learn how to invalidate data for
`indexStore`.
<p>
<a href="../../../../../org/janusgraph/graphdb/idmanagement/IDManager.html#getKey-java.lang.Object-"><code>IDManager.getKey(Object)</code></a> can be used to form a `key` from vertex id.
Alternatively, a method <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a> can be used which converts vertex id into
the `key` before passing the key to this method.
<p>
In case vertices invalidation is needed by processing transaction logs via <a href="../../../../../org/janusgraph/core/log/ChangeState.html" title="interface in org.janusgraph.core.log"><code>ChangeState</code></a>
then the method <a href="../../../../../org/janusgraph/core/log/ChangeState.html#getVertices-org.janusgraph.core.log.Change-"><code>ChangeState.getVertices(Change)</code></a> can be used to retrieve all
changed vertices and passing their ids to <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - key to expire in `edgeStore` cache</dd>
</dl>
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<h4>markKeyAsExpiredInIndexStore</h4>
<pre>void markKeyAsExpiredInIndexStore(<a href="../../../../../org/janusgraph/diskstorage/StaticBuffer.html" title="interface in org.janusgraph.diskstorage">StaticBuffer</a> key)</pre>
<div class="block">Marks specific key as expired in `indexStore` cache.
It will make sure that any retrieved data associated with this key will be invalidated in index cache.
<p>
Warning! This doesn't invalidate `edgeStore` cache. Thus, trying to return properties or edges for the vertex
may still return stale data. See <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markKeyAsExpiredInEdgeStore-org.janusgraph.diskstorage.StaticBuffer-"><code>markKeyAsExpiredInEdgeStore(StaticBuffer)</code></a> JavaDoc to learn how to invalidate
data for `edgeStore`.
<p>
`key` is the encoded key of <a href="../../../../../org/janusgraph/graphdb/database/index/IndexUpdate.html" title="class in org.janusgraph.graphdb.database.index"><code>IndexUpdate</code></a> which can be retrieved via
<a href="../../../../../org/janusgraph/graphdb/database/index/IndexUpdate.html#getKey--"><code>IndexUpdate.getKey()</code></a>. To form the `IndexUpdate` it is possible to use
<a href="../../../../../org/janusgraph/graphdb/database/IndexSerializer.html#getIndexUpdates-org.janusgraph.graphdb.internal.InternalRelation-"><code>IndexSerializer.getIndexUpdates(InternalRelation)</code></a> or
<a href="../../../../../org/janusgraph/graphdb/database/IndexSerializer.html#getIndexUpdates-org.janusgraph.graphdb.internal.InternalVertex-java.util.Collection-"><code>IndexSerializer.getIndexUpdates(InternalVertex, Collection)</code></a>.
<p>
Usually updated vertices and relations (edges or properties) can be found in retrieved mutation logs which are
passed via <a href="../../../../../org/janusgraph/core/log/ChangeState.html" title="interface in org.janusgraph.core.log"><code>ChangeState</code></a> (described in `Transaction Log` documentation of JanusGraph).
<p>
It is also possible to trigger `indexStore` invalidation by forming a vertex and a property yourself.
For example, below method can be used to trigger `indexStore` invalidation for updated property if
previous value, new value, property name, and vertex id are known.
<pre>
public void invalidateUpdatedVertexProperty(StandardJanusGraph graph, long vertexIdUpdated, String propertyNameUpdated, Object previousPropertyValue, Object newPropertyValue){
JanusGraphTransaction tx = graph.newTransaction();
JanusGraphManagement graphMgmt = graph.openManagement();
PropertyKey propertyKey = graphMgmt.getPropertyKey(propertyNameUpdated);
CacheVertex cacheVertex = new CacheVertex((StandardJanusGraphTx) tx, vertexIdUpdated, ElementLifeCycle.Loaded);
StandardVertexProperty propertyPreviousVal = new StandardVertexProperty(propertyKey.longId(), propertyKey, cacheVertex, previousPropertyValue, ElementLifeCycle.Removed);
StandardVertexProperty propertyNewVal = new StandardVertexProperty(propertyKey.longId(), propertyKey, cacheVertex, newPropertyValue, ElementLifeCycle.New);
IndexSerializer indexSerializer = graph.getIndexSerializer();
Collection<IndexUpdate> indexUpdates = indexSerializer.getIndexUpdates(cacheVertex, Arrays.asList(propertyPreviousVal, propertyNewVal));
CacheInvalidationService invalidationService = graph.getDBCacheInvalidationService();
for(IndexUpdate indexUpdate : indexUpdates){
StaticBuffer keyToInvalidate = (StaticBuffer) indexUpdate.getKey();
invalidationService.markKeyAsExpiredInIndexStore(keyToInvalidate);
}
invalidationService.forceClearExpiredKeysInIndexStoreCache();
invalidationService.forceInvalidateVertexInEdgeStoreCache(vertexIdUpdated);
graphMgmt.rollback();
tx.rollback();
}
</pre></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - key to expire in `indexStore` cache</dd>
</dl>
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<pre>void forceClearExpiredKeysInEdgeStoreCache()</pre>
<div class="block">Instead of waiting for a probabilistic invalidation it triggers all cached queries scan and invalidation in `edgeStore`.
This will remove any cached expired data.</div>
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<pre>void forceClearExpiredKeysInIndexStoreCache()</pre>
<div class="block">Instead of waiting for a probabilistic invalidation it triggers all cached queries scan and invalidation in `indexStore`.
This will remove any cached expired data.</div>
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<pre>void forceInvalidateVertexInEdgeStoreCache(<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> vertexId)</pre>
<div class="block">Marks a vertex as expired in `edgeStore` cache (<a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a>) and triggers force
clear of expired cache (i.e. <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceClearExpiredKeysInEdgeStoreCache--"><code>forceClearExpiredKeysInEdgeStoreCache()</code></a>)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vertexId</code> - vertex id to invalidate in `edgeStore` cache</dd>
</dl>
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<pre>void forceInvalidateVerticesInEdgeStoreCache(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a><<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>> vertexIds)</pre>
<div class="block">Marks vertices as expired in `edgeStore` cache (<a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#markVertexAsExpiredInEdgeStore-java.lang.Object-"><code>markVertexAsExpiredInEdgeStore(Object)</code></a>) and triggers force
clear of expired cache (i.e. <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#forceClearExpiredKeysInEdgeStoreCache--"><code>forceClearExpiredKeysInEdgeStoreCache()</code></a>)</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vertexIds</code> - vertex ids to invalidate in `edgeStore` cache</dd>
</dl>
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<h4>clearEdgeStoreCache</h4>
<pre>void clearEdgeStoreCache()</pre>
<div class="block">Clears `edgeStore` cache fully</div>
</li>
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<h4>clearIndexStoreCache</h4>
<pre>void clearIndexStoreCache()</pre>
<div class="block">Clears `indexStore` cache fully</div>
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<h4>clearDBCache</h4>
<pre>void clearDBCache()</pre>
<div class="block">Clears both `edgeStore` cache and `indexStore` cache fully.
It is the same as calling <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#clearEdgeStoreCache--"><code>clearEdgeStoreCache()</code></a> and <a href="../../../../../org/janusgraph/graphdb/database/cache/CacheInvalidationService.html#clearIndexStoreCache--"><code>clearIndexStoreCache()</code></a></div>
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