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| <h2 title="Interface ObjectSizer" class="title">Interface ObjectSizer</h2> |
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| <pre>public interface <span class="typeNameLabel">ObjectSizer</span></pre> |
| <div class="block">The sizer interface defines a method that when called returns the size of the object passed in. |
| Implementations may return hardcoded values for object size if the implementation knows the |
| object size for all objects that are likely to be cached. |
| |
| You should use a sizer with a <a href="../../../../../org/apache/geode/cache/EvictionAttributes.html#createLRUHeapAttributes-org.apache.geode.cache.util.ObjectSizer-"><code>EvictionAttributes.createLRUHeapAttributes(ObjectSizer)</code></a> or |
| <a href="../../../../../org/apache/geode/cache/EvictionAttributes.html#createLRUMemoryAttributes-org.apache.geode.cache.util.ObjectSizer-"><code>EvictionAttributes.createLRUMemoryAttributes(ObjectSizer)</code></a> if you want to use a faster or |
| more accurate method of sizing than provided by the default object sizer, which is |
| <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#SIZE_CLASS_ONCE"><code>SIZE_CLASS_ONCE</code></a></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 3.0</dd> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#DEFAULT">DEFAULT</a></span></code> |
| <div class="block">The default object sizer, currently <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#SIZE_CLASS_ONCE"><code>SIZE_CLASS_ONCE</code></a></div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#REFLECTION_SIZE">REFLECTION_SIZE</a></span></code> |
| <div class="block">An implementation of <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util"><code>ObjectSizer</code></a> that calculates an accurate size for each object that |
| it sizes.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#SIZE_CLASS_ONCE">SIZE_CLASS_ONCE</a></span></code> |
| <div class="block">An implementation of <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util"><code>ObjectSizer</code></a> that calculates an accurate size of the first instance |
| of each class that is put in the cache.</div> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#sizeof-java.lang.Object-">sizeof</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> o)</code> </td> |
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| <a name="SIZE_CLASS_ONCE"> |
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| <h4>SIZE_CLASS_ONCE</h4> |
| <pre><a href="../../../../../org/apache/geode/annotations/Immutable.html" title="annotation in org.apache.geode.annotations">@Immutable</a> |
| static final <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a> SIZE_CLASS_ONCE</pre> |
| <div class="block">An implementation of <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util"><code>ObjectSizer</code></a> that calculates an accurate size of the first instance |
| of each class that is put in the cache. After the first instance, it will return the same size |
| for every instance of that class. |
| |
| This sizer is a compromise between generating accurate sizes for every object and performance. |
| It should work well if the keys and values in the region don't vary greatly in size. For |
| accurate sizing of every instance use <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#REFLECTION_SIZE"><code>REFLECTION_SIZE</code></a> instead. |
| |
| This sizer does generate an accurate size for strings and byte arrays every time, because there |
| is very little performance impact from sizing these objects.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 6.5</dd> |
| </dl> |
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| </ul> |
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| <h4>REFLECTION_SIZE</h4> |
| <pre><a href="../../../../../org/apache/geode/annotations/Immutable.html" title="annotation in org.apache.geode.annotations">@Immutable</a> |
| static final <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a> REFLECTION_SIZE</pre> |
| <div class="block">An implementation of <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util"><code>ObjectSizer</code></a> that calculates an accurate size for each object that |
| it sizes. |
| |
| This sizer will add up the sizes of all objects that are reachable from the keys and values in |
| your region by non-static fields. |
| |
| For objects that are all approximately the same size, consider using <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#SIZE_CLASS_ONCE"><code>SIZE_CLASS_ONCE</code></a>. |
| It will have much better performance.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 6.5</dd> |
| </dl> |
| </li> |
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| <h4>DEFAULT</h4> |
| <pre><a href="../../../../../org/apache/geode/annotations/Immutable.html" title="annotation in org.apache.geode.annotations">@Immutable</a> |
| static final <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html" title="interface in org.apache.geode.cache.util">ObjectSizer</a> DEFAULT</pre> |
| <div class="block">The default object sizer, currently <a href="../../../../../org/apache/geode/cache/util/ObjectSizer.html#SIZE_CLASS_ONCE"><code>SIZE_CLASS_ONCE</code></a></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 6.5</dd> |
| </dl> |
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| <h4>sizeof</h4> |
| <pre>int sizeof(<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> o)</pre> |
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