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<div class="subTitle">org.apache.geode.cache.execute</div>
<h2 title="Interface Function" class="title">Interface Function&lt;T&gt;</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../org/apache/geode/lang/Identifiable.html" title="interface in org.apache.geode.lang">Identifiable</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/geode/modules/util/BootstrappingFunction.html" title="class in org.apache.geode.modules.util">BootstrappingFunction</a>, <a href="../../../../../org/apache/geode/management/cli/CliFunction.html" title="class in org.apache.geode.management.cli">CliFunction</a>, <a href="../../../../../org/apache/geode/modules/util/CreateRegionFunction.html" title="class in org.apache.geode.modules.util">CreateRegionFunction</a>, <a href="../../../../../org/apache/geode/cache/execute/FunctionAdapter.html" title="class in org.apache.geode.cache.execute">FunctionAdapter</a>, <a href="../../../../../org/apache/geode/modules/util/RegionSizeFunction.html" title="class in org.apache.geode.modules.util">RegionSizeFunction</a>, <a href="../../../../../org/apache/geode/modules/util/TouchPartitionedRegionEntriesFunction.html" title="class in org.apache.geode.modules.util">TouchPartitionedRegionEntriesFunction</a>, <a href="../../../../../org/apache/geode/modules/util/TouchReplicatedRegionEntriesFunction.html" title="class in org.apache.geode.modules.util">TouchReplicatedRegionEntriesFunction</a></dd>
</dl>
<dl>
<dt>Functional Interface:</dt>
<dd>This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.</dd>
</dl>
<hr>
<br>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/FunctionalInterface.html?is-external=true" title="class or interface in java.lang">@FunctionalInterface</a>
public interface <span class="typeNameLabel">Function&lt;T&gt;</span>
extends <a href="../../../../../org/apache/geode/lang/Identifiable.html" title="interface in org.apache.geode.lang">Identifiable</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</pre>
<div class="block">Defines the interface a user defined function implements. <a href="../../../../../org/apache/geode/cache/execute/Function.html" title="interface in org.apache.geode.cache.execute"><code>Function</code></a>s can be of different
types. Some can have results while others need not return any result. Some functions require
writing in the targeted <a href="../../../../../org/apache/geode/cache/Region.html" title="interface in org.apache.geode.cache"><code>Region</code></a> while some may just be read operations.
<p>
Even though this interface extends Serializable, functions will only be serialized if they are
not registered. For best performance it is recommended that you implement <a href="../../../../../org/apache/geode/cache/execute/Function.html#getId--"><code>getId()</code></a> to
return a non-null identifier and register your function using <a href="../../../../../org/apache/geode/cache/execute/FunctionService.html#registerFunction-org.apache.geode.cache.execute.Function-"><code>FunctionService.registerFunction(Function)</code></a> or the cache.xml <code>function</code> element.
<p></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.0</dd>
</dl>
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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">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#execute-org.apache.geode.cache.execute.FunctionContext-">execute</a></span>(<a href="../../../../../org/apache/geode/cache/execute/FunctionContext.html" title="interface in org.apache.geode.cache.execute">FunctionContext</a>&lt;<a href="../../../../../org/apache/geode/cache/execute/Function.html" title="type parameter in Function">T</a>&gt;&nbsp;context)</code>
<div class="block">The method which contains the logic to be executed.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>default <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#getId--">getId</a></span>()</code>
<div class="block">Return a unique function identifier, used to register the function with <a href="../../../../../org/apache/geode/cache/execute/FunctionService.html" title="class in org.apache.geode.cache.execute"><code>FunctionService</code></a></div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>default <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security">ResourcePermission</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#getRequiredPermissions-java.lang.String-">getRequiredPermissions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;regionName)</code>
<div class="block">Returns the list of ResourcePermission this function requires.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>default <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security">ResourcePermission</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#getRequiredPermissions-java.lang.String-java.lang.Object-">getRequiredPermissions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;regionName,
<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>&nbsp;args)</code>
<div class="block">Returns the list of ResourcePermission this function requires.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>default boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#hasResult--">hasResult</a></span>()</code>
<div class="block">Specifies whether the function sends results while executing.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>default boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#isHA--">isHA</a></span>()</code>
<div class="block">Specifies whether the function is eligible for re-execution (in case of failure).</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>default boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/geode/cache/execute/Function.html#optimizeForWrite--">optimizeForWrite</a></span>()</code>
<div class="block">
Return true to indicate to GemFire the method requires optimization for writing the targeted
<a href="../../../../../org/apache/geode/cache/execute/FunctionService.html#onRegion-org.apache.geode.cache.Region-"><code>FunctionService.onRegion(org.apache.geode.cache.Region)</code></a> and any associated <a href="../../../../../org/apache/geode/cache/execute/Execution.html#withFilter-java.util.Set-">routing objects</a>.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.geode.lang.<a href="../../../../../org/apache/geode/lang/Identifiable.html" title="interface in org.apache.geode.lang">Identifiable</a></h3>
<code><a href="../../../../../org/apache/geode/lang/Identifiable.html#exists-java.util.List-java.lang.String-">exists</a>, <a href="../../../../../org/apache/geode/lang/Identifiable.html#find-java.util.List-java.lang.String-">find</a>, <a href="../../../../../org/apache/geode/lang/Identifiable.html#remove-java.util.List-java.lang.String-">remove</a></code></li>
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<h3>Method Detail</h3>
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<h4>hasResult</h4>
<pre>default&nbsp;boolean&nbsp;hasResult()</pre>
<div class="block">Specifies whether the function sends results while executing. The method returns false if no
result is expected.<br>
<p>
If this method returns false, <a href="../../../../../org/apache/geode/cache/execute/ResultCollector.html#getResult--"><code>ResultCollector.getResult()</code></a> throws
<a href="../../../../../org/apache/geode/cache/execute/FunctionException.html" title="class in org.apache.geode.cache.execute"><code>FunctionException</code></a>.
<p>
If this method returns true, <a href="../../../../../org/apache/geode/cache/execute/ResultCollector.html#getResult--"><code>ResultCollector.getResult()</code></a> blocks and
waits for the result of function execution
<p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether this function returns a Result back to the caller.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.0</dd>
</dl>
</li>
</ul>
<a name="execute-org.apache.geode.cache.execute.FunctionContext-">
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<h4>execute</h4>
<pre>void&nbsp;execute(<a href="../../../../../org/apache/geode/cache/execute/FunctionContext.html" title="interface in org.apache.geode.cache.execute">FunctionContext</a>&lt;<a href="../../../../../org/apache/geode/cache/execute/Function.html" title="type parameter in Function">T</a>&gt;&nbsp;context)</pre>
<div class="block">The method which contains the logic to be executed. This method should be thread safe and may
be invoked more than once on a given member for a single <a href="../../../../../org/apache/geode/cache/execute/Execution.html" title="interface in org.apache.geode.cache.execute"><code>Execution</code></a>. The context
provided to this function is the one which was built using <a href="../../../../../org/apache/geode/cache/execute/Execution.html" title="interface in org.apache.geode.cache.execute">Execution</a>. The contexts
can be data dependent or data-independent so user should check to see if the context provided
in parameter is instance of <a href="../../../../../org/apache/geode/cache/execute/RegionFunctionContext.html" title="interface in org.apache.geode.cache.execute"><code>RegionFunctionContext</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>context</code> - as created by <a href="../../../../../org/apache/geode/cache/execute/Execution.html" title="interface in org.apache.geode.cache.execute"><code>Execution</code></a></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.0</dd>
</dl>
</li>
</ul>
<a name="getId--">
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<ul class="blockList">
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<h4>getId</h4>
<pre>default&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;getId()</pre>
<div class="block">Return a unique function identifier, used to register the function with <a href="../../../../../org/apache/geode/cache/execute/FunctionService.html" title="class in org.apache.geode.cache.execute"><code>FunctionService</code></a></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/geode/lang/Identifiable.html#getId--">getId</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/geode/lang/Identifiable.html" title="interface in org.apache.geode.lang">Identifiable</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>string identifying this function</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.0</dd>
</dl>
</li>
</ul>
<a name="optimizeForWrite--">
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<h4>optimizeForWrite</h4>
<pre>default&nbsp;boolean&nbsp;optimizeForWrite()</pre>
<div class="block"><p>
Return true to indicate to GemFire the method requires optimization for writing the targeted
<a href="../../../../../org/apache/geode/cache/execute/FunctionService.html#onRegion-org.apache.geode.cache.Region-"><code>FunctionService.onRegion(org.apache.geode.cache.Region)</code></a> and any associated <a href="../../../../../org/apache/geode/cache/execute/Execution.html#withFilter-java.util.Set-">routing objects</a>.
<p>
Returning false will optimize for read behavior on the targeted <a href="../../../../../org/apache/geode/cache/execute/FunctionService.html#onRegion-org.apache.geode.cache.Region-"><code>FunctionService.onRegion(org.apache.geode.cache.Region)</code></a> and any associated <a href="../../../../../org/apache/geode/cache/execute/Execution.html#withFilter-java.util.Set-">routing objects</a>.
<p>
This method is only consulted when Region passed to
FunctionService#onRegion(org.apache.geode.cache.Region)
is a partitioned region
<p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>false if the function is read only, otherwise returns true</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/geode/cache/execute/FunctionService.html" title="class in org.apache.geode.cache.execute"><code>FunctionService</code></a></dd>
</dl>
</li>
</ul>
<a name="isHA--">
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<li class="blockList">
<h4>isHA</h4>
<pre>default&nbsp;boolean&nbsp;isHA()</pre>
<div class="block">Specifies whether the function is eligible for re-execution (in case of failure).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether the function is eligible for re-execution.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.5</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/geode/cache/execute/FunctionContext.html#isPossibleDuplicate--"><code>FunctionContext.isPossibleDuplicate()</code></a></dd>
</dl>
</li>
</ul>
<a name="getRequiredPermissions-java.lang.String-">
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<ul class="blockList">
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<h4>getRequiredPermissions</h4>
<pre>default&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security">ResourcePermission</a>&gt;&nbsp;getRequiredPermissions(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;regionName)</pre>
<div class="block">Returns the list of ResourcePermission this function requires.
<p>
By default, functions require DATA:WRITE permission. If your function requires other
permissions, you will need to override this method.
<p>
Please be as specific as possible when you set the required permissions for your function e.g.
if your function reads from a region, it would be good to include the region name in your
permission. It's better to return "DATA:READ:regionName" as the required permission other than
"DATA:READ", because the latter means only users with read permission on ALL regions can
execute your function.
<p>
All the permissions returned from this method will be ANDed together.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>regionName</code> - the region this function will be executed on. The regionName is optional and
will only be present when the function is executed by an onRegion() executor. In other
cases,
it will be null. This method returns permissions appropriate to the context, independent
of the
presence of the regionName parameter.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a collection of <a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security"><code>ResourcePermission</code></a>s indicating the permissions required to
execute the function.</dd>
</dl>
</li>
</ul>
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<h4>getRequiredPermissions</h4>
<pre>default&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a>&lt;<a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security">ResourcePermission</a>&gt;&nbsp;getRequiredPermissions(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;regionName,
<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>&nbsp;args)</pre>
<div class="block">Returns the list of ResourcePermission this function requires.
<p>
By default, functions require DATA:WRITE permission. If your function requires other
permissions, you will need to override this method.
<p>
Please be as specific as possible when you set the required permissions for your function e.g.
if your function reads from a region, it would be good to include the region name in your
permission. It's better to return "DATA:READ:regionName" as the required permission other than
"DATA:READ", because the latter means only users with read permission on ALL regions can
execute your function.
<p>
All the permissions returned from this method will be ANDed together.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>regionName</code> - the region this function will be executed on. The regionName is optional and
will only be present when the function is executed by an onRegion() executor. In other
cases,
it will be null. This method returns permissions appropriate to the context, independent
of the
presence of the regionName parameter.</dd>
<dd><code>args</code> - the arguments to the function.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a collection of <a href="../../../../../org/apache/geode/security/ResourcePermission.html" title="class in org.apache.geode.security"><code>ResourcePermission</code></a>s indicating the permissions required to
execute the function.</dd>
</dl>
</li>
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