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| <div class="subTitle">org.apache.geode.cache</div> |
| <h2 title="Interface LoaderHelper" class="title">Interface LoaderHelper<K,V></h2> |
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| <pre>public interface <span class="typeNameLabel">LoaderHelper<K,V></span></pre> |
| <div class="block">Provides a set of APIs to help the implementation of the <code>CacheLoader</code> load method. An |
| instance of <code>LoaderHelper</code> is only valid within the |
| <a href="../../../../org/apache/geode/cache/CacheLoader.html#load-org.apache.geode.cache.LoaderHelper-"><code>load</code></a> method.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>GemFire 2.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/CacheLoader.html#load-org.apache.geode.cache.LoaderHelper-"><code>load</code></a></dd> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <td class="colFirst"><code><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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/LoaderHelper.html#getArgument--">getArgument</a></span>()</code> |
| <div class="block">Return the argument object for the load method that was passed in from application code.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">K</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/LoaderHelper.html#getKey--">getKey</a></span>()</code> |
| <div class="block">Returns the key for the value being loaded.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/geode/cache/Region.html" title="interface in org.apache.geode.cache">Region</a><<a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">K</a>,<a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/LoaderHelper.html#getRegion--">getRegion</a></span>()</code> |
| <div class="block">Returns the region to which the entry belongs.</div> |
| </td> |
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| <td class="colFirst"><code><a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">V</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/LoaderHelper.html#netSearch-boolean-">netSearch</a></span>(boolean doNetLoad)</code> |
| <div class="block">Searches other caches for the value to be loaded.</div> |
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| <h4>netSearch</h4> |
| <pre><a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">V</a> netSearch(boolean doNetLoad) |
| throws <a href="../../../../org/apache/geode/cache/CacheLoaderException.html" title="class in org.apache.geode.cache">CacheLoaderException</a>, |
| <a href="../../../../org/apache/geode/cache/TimeoutException.html" title="class in org.apache.geode.cache">TimeoutException</a></pre> |
| <div class="block">Searches other caches for the value to be loaded. If the cache is part of a distributed caching |
| system, <code>netSearch</code> will try to locate the requested value in any other cache within |
| the system. If the search is successful, a reference to a local copy of the value is returned. |
| If there is no value for this entry present in the system, and doNetLoad is true, GemFire looks |
| for and invokes <code>CacheLoaders</code> in other nodes in the system. The net load will |
| invoke one loader at a time until a loader either returns a non-null value or throws an |
| exception. If the object is not found, <code>null</code> is returned.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>doNetLoad</code> - if true, and there is no valid value found for this entry in the system, then |
| look for and invoke loaders on other nodes</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the requested value or null if not found</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../org/apache/geode/cache/TimeoutException.html" title="class in org.apache.geode.cache">TimeoutException</a></code> - if the netSearch times out before getting a response from another |
| cache</dd> |
| <dd><code><a href="../../../../org/apache/geode/cache/CacheLoaderException.html" title="class in org.apache.geode.cache">CacheLoaderException</a></code> - If <code>netSearch</code> is attempted on a |
| <a href="../../../../org/apache/geode/cache/Scope.html#LOCAL">local</a> region.</dd> |
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| <h4>getKey</h4> |
| <pre><a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">K</a> getKey()</pre> |
| <div class="block">Returns the key for the value being loaded.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the name Object for the object being loaded</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/CacheLoader.html#load-org.apache.geode.cache.LoaderHelper-"><code>load</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getRegion</h4> |
| <pre><a href="../../../../org/apache/geode/cache/Region.html" title="interface in org.apache.geode.cache">Region</a><<a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">K</a>,<a href="../../../../org/apache/geode/cache/LoaderHelper.html" title="type parameter in LoaderHelper">V</a>> getRegion()</pre> |
| <div class="block">Returns the region to which the entry belongs.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the name of the region for the object being loaded</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/geode/cache/CacheLoader.html#load-org.apache.geode.cache.LoaderHelper-"><code>load</code></a></dd> |
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| <h4>getArgument</h4> |
| <pre><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> getArgument()</pre> |
| <div class="block">Return the argument object for the load method that was passed in from application code. This |
| object is passed in as <i>aLoaderArgument</i> in <a href="../../../../org/apache/geode/cache/Region.html#get-java.lang.Object-java.lang.Object-"><code>get</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the argument or null if one was not supplied</dd> |
| </dl> |
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