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<div class="subTitle">com.fluidops.fedx.cache</div>
<h2 title="Class MemoryCache" class="title">Class MemoryCache</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.fluidops.fedx.cache.MemoryCache</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></dd>
</dl>
<hr>
<br>
<pre>public class <a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.53">MemoryCache</a>
extends java.lang.Object
implements <a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></pre>
<div class="block">A simple implementation of a Main memory cache which is persisted to the provided cache location.
 
 Currently only binary provenance information is maintained.</div>
<dl><dt><span class="strong">Author:</span></dt>
  <dd>Andreas Schwarte</dd></dl>
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<h3>Nested classes/interfaces inherited from interface&nbsp;com.fluidops.fedx.cache.<a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></h3>
<code><a href="../../../../com/fluidops/fedx/cache/Cache.StatementSourceAssurance.html" title="enum in com.fluidops.fedx.cache">Cache.StatementSourceAssurance</a></code></li>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static org.apache.log4j.Logger</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#log">log</a></strong></code>&nbsp;</td>
</tr>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#MemoryCache(java.lang.String)">MemoryCache</a></strong>(java.lang.String&nbsp;cacheLocation)</code>&nbsp;</td>
</tr>
</table>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#addEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">addEntry</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                <a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a>&nbsp;cacheEntry)</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fluidops/fedx/cache/Cache.StatementSourceAssurance.html" title="enum in com.fluidops.fedx.cache">Cache.StatementSourceAssurance</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#canProvideStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">canProvideStatements</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                                        <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</code>
<div class="block">Ask the cache if a given endpoint can provide results for a subQuery.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#clear()">clear</a></strong>()</code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a></code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#getCacheEntry(com.fluidops.fedx.structures.SubQuery)">getCacheEntry</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</code>
<div class="block">Retrieve the CacheEntry instance matching the specified subQuery.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>info.aduna.iteration.CloseableIteration&lt;? extends org.openrdf.model.Statement,java.lang.Exception&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#getStatements(com.fluidops.fedx.structures.SubQuery)">getStatements</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</code>
<div class="block">Retrieve an Iterator containing the results for the given subQuery.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>info.aduna.iteration.CloseableIteration&lt;? extends org.openrdf.model.Statement,java.lang.Exception&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#getStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">getStatements</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                          <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</code>
<div class="block">Retrieve an Iterator containing the results for the given subQuery for the given endpoint.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery)">hasLocalStatements</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</code>
<div class="block">Ask the cache if it can provide results for a subQuery for any endpoint.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">hasLocalStatements</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                                    <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</code>
<div class="block">Ask the cache if it can provide results for a subQuery for the specified endpoint.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#initialize()">initialize</a></strong>()</code>
<div class="block">Initialize this cache, e.g.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#invalidate()">invalidate</a></strong>()</code>
<div class="block">Invalidate some of the contents of this cache, e.g.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#persist()">persist</a></strong>()</code>
<div class="block">Persist the state of the Cache (optional operation)</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#removeEntry(com.fluidops.fedx.structures.SubQuery)">removeEntry</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../com/fluidops/fedx/cache/MemoryCache.html#updateEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">updateEntry</a></strong>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                      <a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a>&nbsp;merge)</code>
<div class="block">Update the given entry using a merge procedure:
 
 Data present in the original is overwritten, if not present it is simply added.</div>
</td>
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</table>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
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<h3>Field Detail</h3>
<a name="log">
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<h4>log</h4>
<pre>public static&nbsp;org.apache.log4j.Logger <a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.55">log</a></pre>
</li>
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</li>
</ul>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor_detail">
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<h3>Constructor Detail</h3>
<a name="MemoryCache(java.lang.String)">
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<ul class="blockListLast">
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<h4>MemoryCache</h4>
<pre>public&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.60">MemoryCache</a>(java.lang.String&nbsp;cacheLocation)</pre>
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<h3>Method Detail</h3>
<a name="addEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">
<!--   -->
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<ul class="blockList">
<li class="blockList">
<h4>addEntry</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.67">addEntry</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
            <a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a>&nbsp;cacheEntry)
              throws <a href="../../../../com/fluidops/fedx/exception/EntryAlreadyExistsException.html" title="class in com.fluidops.fedx.exception">EntryAlreadyExistsException</a></pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#addEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">addEntry</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/EntryAlreadyExistsException.html" title="class in com.fluidops.fedx.exception">EntryAlreadyExistsException</a></code></dd></dl>
</li>
</ul>
<a name="updateEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>updateEntry</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.81">updateEntry</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
               <a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a>&nbsp;merge)
                 throws <a href="../../../../com/fluidops/fedx/exception/EntryUpdateException.html" title="class in com.fluidops.fedx.exception">EntryUpdateException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#updateEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">Cache</a></code></strong></div>
<div class="block">Update the given entry using a merge procedure:
 
 Data present in the original is overwritten, if not present it is simply added. Note that data
 not touched in the specified merge structure will remain as is.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#updateEntry(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.cache.CacheEntry)">updateEntry</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/EntryUpdateException.html" title="class in com.fluidops.fedx.exception">EntryUpdateException</a></code></dd></dl>
</li>
</ul>
<a name="removeEntry(com.fluidops.fedx.structures.SubQuery)">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>removeEntry</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.97">removeEntry</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)
                 throws <a href="../../../../com/fluidops/fedx/exception/EntryUpdateException.html" title="class in com.fluidops.fedx.exception">EntryUpdateException</a></pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#removeEntry(com.fluidops.fedx.structures.SubQuery)">removeEntry</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/EntryUpdateException.html" title="class in com.fluidops.fedx.exception">EntryUpdateException</a></code></dd></dl>
</li>
</ul>
<a name="canProvideStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>canProvideStatements</h4>
<pre>public&nbsp;<a href="../../../../com/fluidops/fedx/cache/Cache.StatementSourceAssurance.html" title="enum in com.fluidops.fedx.cache">Cache.StatementSourceAssurance</a>&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.106">canProvideStatements</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                                                  <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#canProvideStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">Cache</a></code></strong></div>
<div class="block">Ask the cache if a given endpoint can provide results for a subQuery. Note that
 S1:={?x, c, c} and S2:={?y, c, c} are treated as the same statement.
 
 Subset inference:
 
 Cache knows that S1:={?x, c, c} brings results, hence also S2:={?x, ?y, c} will
 provide results. This method can be used to test this and will return HAS_STATEMENTS.
 
 Superset inference:
 
 Cache knows that S1:={?x, ?y, c} brings results, hence S2:={?x, c, c} may provide
 results. This method will return POSSIBLY_HAS_STATEMENTS in such a case.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#canProvideStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">canProvideStatements</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>NONE -> the cache knows that endpoint cannot provide any results
                HAS_LOCAL_STATEMENTS -> the cache has local statements (highest priority)
                HAS_REMOTE_STATEMENTS -> the cache knows that endpoint does provide results
                POSSIBLY_HAS_STATEMENTS -> if the endpoint is not known or in case of superset inference</dd></dl>
</li>
</ul>
<a name="getCacheEntry(com.fluidops.fedx.structures.SubQuery)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>getCacheEntry</h4>
<pre>public&nbsp;<a href="../../../../com/fluidops/fedx/cache/CacheEntry.html" title="interface in com.fluidops.fedx.cache">CacheEntry</a>&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.117">getCacheEntry</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getCacheEntry(com.fluidops.fedx.structures.SubQuery)">Cache</a></code></strong></div>
<div class="block">Retrieve the CacheEntry instance matching the specified subQuery. Note that S1:={?x, c, c} 
 and S2:={?y, c, c} are treated as the same statement.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getCacheEntry(com.fluidops.fedx.structures.SubQuery)">getCacheEntry</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the CacheResult or null (if no match was found) - read only clone!</dd></dl>
</li>
</ul>
<a name="getStatements(com.fluidops.fedx.structures.SubQuery)">
<!--   -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>getStatements</h4>
<pre>public&nbsp;info.aduna.iteration.CloseableIteration&lt;? extends org.openrdf.model.Statement,java.lang.Exception&gt;&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.124">getStatements</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getStatements(com.fluidops.fedx.structures.SubQuery)">Cache</a></code></strong></div>
<div class="block">Retrieve an Iterator containing the results for the given subQuery. If no match is
 available locally an empty iterator is returned. Note that S1:={?x, c, c} 
 and S2:={?y, c, c} are treated as the same statement.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getStatements(com.fluidops.fedx.structures.SubQuery)">getStatements</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>an iterator, possible empty if no data is available locally</dd></dl>
</li>
</ul>
<a name="getStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">
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<ul class="blockList">
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<h4>getStatements</h4>
<pre>public&nbsp;info.aduna.iteration.CloseableIteration&lt;? extends org.openrdf.model.Statement,java.lang.Exception&gt;&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.131">getStatements</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                                                                                                               <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">Cache</a></code></strong></div>
<div class="block">Retrieve an Iterator containing the results for the given subQuery for the given endpoint.
 If no match is available locally an empty iterator is returned. Note that S1:={?x, c, c} 
 and S2:={?y, c, c} are treated as the same statement.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#getStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">getStatements</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>an iterator, possible empty if no data is available locally</dd></dl>
</li>
</ul>
<a name="hasLocalStatements(com.fluidops.fedx.structures.SubQuery)">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>hasLocalStatements</h4>
<pre>public&nbsp;java.util.List&lt;<a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&gt;&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.138">hasLocalStatements</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery)">Cache</a></code></strong></div>
<div class="block">Ask the cache if it can provide results for a subQuery for any endpoint. Note that
 S1:={?x, c, c} and S2:={?y, c, c} are treated as the same statement.
 
 Subset inference:
 
 Cache knows that S1:={?x, c, c} has local results. However, cache will pessimistically
 assume that S2:={?x, ?y, c} has no local results as we cannot assure that the complete
 data is available locally. Hence, this method will return false.
 
 Superset inference:
 
 Cache knows that S1:={?x, ?y, c} has local results, hence S2:={?x, c, c} has local results
 as well as the cache maintains a superset of the requested results. In such a case this
 method will return true.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery)">hasLocalStatements</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the endpoints for which local data is available, an empty list otherwise</dd></dl>
</li>
</ul>
<a name="hasLocalStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">
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<li class="blockList">
<h4>hasLocalStatements</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.144">hasLocalStatements</a>(<a href="../../../../com/fluidops/fedx/structures/SubQuery.html" title="class in com.fluidops.fedx.structures">SubQuery</a>&nbsp;subQuery,
                         <a href="../../../../com/fluidops/fedx/structures/Endpoint.html" title="class in com.fluidops.fedx.structures">Endpoint</a>&nbsp;endpoint)</pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">Cache</a></code></strong></div>
<div class="block">Ask the cache if it can provide results for a subQuery for the specified endpoint. 
 Note that S1:={?x, c, c} and S2:={?y, c, c} are treated as the same statement.
 
 Subset inference:
 
 Cache knows that S1:={?x, c, c} has local results. However, cache will pessimistically
 assume that S2:={?x, ?y, c} has no local results as we cannot assure that the complete
 data is available locally. Hence, this method will return false.
 
 Superset inference:
 
 Cache knows that S1:={?x, ?y, c} has local results, hence S2:={?x, c, c} has local results
 as well as the cache maintains a superset of the requested results. In such a case this
 method will return true.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#hasLocalStatements(com.fluidops.fedx.structures.SubQuery, com.fluidops.fedx.structures.Endpoint)">hasLocalStatements</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd></dd></dl>
</li>
</ul>
<a name="initialize()">
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<ul class="blockList">
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<h4>initialize</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.151">initialize</a>()
                throws <a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#initialize()">Cache</a></code></strong></div>
<div class="block">Initialize this cache, e.g. from file system.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#initialize()">initialize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></code></dd></dl>
</li>
</ul>
<a name="invalidate()">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>invalidate</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.166">invalidate</a>()
                throws <a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#invalidate()">Cache</a></code></strong></div>
<div class="block">Invalidate some of the contents of this cache, e.g. free not used resources.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#invalidate()">invalidate</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></code></dd></dl>
</li>
</ul>
<a name="persist()">
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<ul class="blockList">
<li class="blockList">
<h4>persist</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.171">persist</a>()
             throws <a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></pre>
<div class="block"><strong>Description copied from interface:&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html#persist()">Cache</a></code></strong></div>
<div class="block">Persist the state of the Cache (optional operation)</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#persist()">persist</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../com/fluidops/fedx/exception/FedXException.html" title="class in com.fluidops.fedx.exception">FedXException</a></code></dd></dl>
</li>
</ul>
<a name="clear()">
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<h4>clear</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/com/fluidops/fedx/cache/MemoryCache.html#line.186">clear</a>()</pre>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../com/fluidops/fedx/cache/Cache.html#clear()">clear</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../com/fluidops/fedx/cache/Cache.html" title="interface in com.fluidops.fedx.cache">Cache</a></code></dd>
</dl>
</li>
</ul>
</li>
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