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| <div class="subTitle">org.apache.ignite.cache</div> |
| <h2 title="Interface CacheEntry" class="title">Interface CacheEntry<K,V></h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd>javax.cache.Cache.Entry<K,V></dd> |
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| <pre>public interface <span class="strong">CacheEntry<K,V></span> |
| extends javax.cache.Cache.Entry<K,V></pre> |
| <div class="block">Cache entry that extends <code>Cache.Entry</code> by providing additional entry related information. |
| <p> |
| To get an instance of <code>CacheEntry</code> from <code>Cache.Entry</code> use |
| <code>Cache.Entry.unwrap(Class)</code> method by passing <code>CacheEntry</code> class to it as the argument. |
| <p> |
| <code>CacheEntry</code> is supported only for <code>Cache.Entry</code> returned by one of the following methods: |
| <ul> |
| <li><code>Cache.invoke(Object, EntryProcessor, Object...)</code></li> |
| <li><code>Cache.invokeAll(Set, EntryProcessor, Object...)</code></li> |
| <li>invoke and invokeAll methods of <a href="../../../../org/apache/ignite/IgniteCache.html" title="interface in org.apache.ignite"><code>IgniteCache</code></a></li> |
| <li><a href="../../../../org/apache/ignite/IgniteCache.html#randomEntry()"><code>IgniteCache.randomEntry()</code></a></li> |
| </ul> |
| <p> |
| To get an instance of <code>CacheEntry</code> directly use <a href="../../../../org/apache/ignite/IgniteCache.html#getEntry(K)"><code>IgniteCache.getEntry(Object)</code></a> or |
| <a href="../../../../org/apache/ignite/IgniteCache.html#getEntries(java.util.Set)"><code>IgniteCache.getEntries(Set)</code></a> methods. |
| <p> |
| <code>CacheEntry</code> is not supported for <code>Cache.iterator()</code> because of performance reasons. |
| <code>Cache.iterator()</code> loads entries from all the cluster nodes and to speed up the load additional |
| information, like entry's version, is ignored. |
| |
| <h2 class="header">Java Example</h2> |
| <pre name="code" class="java"> |
| IgniteCache<Integer, String> cache = grid(0).cache(null); |
| |
| CacheEntry<String, Integer> entry1 = cache.invoke(100, |
| new EntryProcessor<Integer, String, CacheEntry<String, Integer>>() { |
| public CacheEntry<String, Integer> process(MutableEntry<Integer, String> entry, |
| Object... arguments) throws EntryProcessorException { |
| return entry.unwrap(CacheEntry.class); |
| } |
| }); |
| |
| // Cache entry for the given key may be updated at some point later. |
| |
| CacheEntry<String, Integer> entry2 = cache.invoke(100, |
| new EntryProcessor<Integer, String, CacheEntry<String, Integer>>() { |
| public CacheEntry<String, Integer> process(MutableEntry<Integer, String> entry, |
| Object... arguments) throws EntryProcessorException { |
| return entry.unwrap(CacheEntry.class); |
| } |
| }); |
| |
| // Comparing entries' versions. |
| if (entry1.version().compareTo(entry2.version()) < 0) { |
| // the entry has been updated |
| } |
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| <caption><span>Methods</span><span class="tabEnd"> </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 class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/cache/CacheEntry.html#updateTime()">updateTime</a></strong>()</code> |
| <div class="block">Returns the time when the cache entry for the given key has been updated or initially created.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/cache/CacheEntry.html#version()">version</a></strong>()</code> |
| <div class="block">Returns a comparable object representing the version of this cache entry.</div> |
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| <h3>Methods inherited from interface javax.cache.Cache.Entry</h3> |
| <code>getKey, getValue, unwrap</code></li> |
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| <h4>version</h4> |
| <pre><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a> version()</pre> |
| <div class="block">Returns a comparable object representing the version of this cache entry. |
| <p> |
| It is valid to compare cache entries' versions for the same key. In this case the latter update will be |
| represented by a higher version. The result of versions comparison of cache entries of different keys is |
| undefined.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Version of this cache entry.</dd></dl> |
| </li> |
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| <a name="updateTime()"> |
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| <h4>updateTime</h4> |
| <pre>long updateTime()</pre> |
| <div class="block">Returns the time when the cache entry for the given key has been updated or initially created. |
| <p> |
| It is valid to compare cache entries' update time for the same key. In this case the latter update will |
| be represented by higher update time. The result of update time comparison of cache entries of different keys is |
| undefined.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>Time in milliseconds.</dd></dl> |
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