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<h2 title="Interface RequestProcessorFactoryFactory" class="title">Interface RequestProcessorFactoryFactory</h2>
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<dd><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory</a>, <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory</a></dd>
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<pre>public interface <span class="strong">RequestProcessorFactoryFactory</span></pre>
<div class="block"><p>The request processor is the object, which is actually performing
the request. There is nothing magic about the request processor:
It may very well be a POJO. The <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a>
is passed to the <a href="../../../../org/apache/xmlrpc/server/AbstractReflectiveHandlerMapping.html" title="class in org.apache.xmlrpc.server"><code>AbstractReflectiveHandlerMapping</code></a> at startup.
The mapping uses this factory to create instances of
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory.RequestProcessorFactory</code></a>, which are used to initialize
the <a href="../../../../org/apache/xmlrpc/server/ReflectiveXmlRpcHandler.html" title="class in org.apache.xmlrpc.server"><code>ReflectiveXmlRpcHandler</code></a>. The handler in turn uses its
factory to create the actual request processor when a request comes
in.</p>
<p>However, the question arises, when and how the request processor
is created and whether it needs request specific initialization.
The <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a> is an object, which makes
that logic pluggable. Unfortunately, we aren't done with a single
factory: We even need a factory for factories. The rationale is
best explained by looking at the different use cases and how to
implement them.</p>
<p>The default <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a> is the
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory</code></a>. It creates a new
processor instance for any request. In other words, it allows the
request processor to have some state. This is fine, if the request
processor is a lightweight object or needs request specific
initialization. In this case, the actual request processor is
created and invoked when
calling <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><code>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</code></a>.</p>
<p>An alternative implementation is the
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory</code></a>, which may be used to
create stateless request processors. Stateless request processors
are typically heavyweight objects, which have an expensive
initialization phase. The processor factory, which is created by
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html#getRequestProcessorFactory(java.lang.Class)"><code>getRequestProcessorFactory(Class pClass)</code></a> contains an
initialized singleton, which is returned by
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><code>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</code></a>.</p>
<p>Other alternatives might be a
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a>, which maintains a pool
of <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory.RequestProcessorFactory</code></a> instances. The instances are
configured by calling
<a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><code>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</code></a>.</p></div>
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<td class="colFirst"><code>static interface </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</a></strong></code>
<div class="block">This is the factory for request processors.</div>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory</a></strong></code>
<div class="block">This is the default implementation of <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a>.</div>
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<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory</a></strong></code>
<div class="block">This is an alternative implementation of <a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><code>RequestProcessorFactoryFactory</code></a>.</div>
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<td class="colFirst"><code><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html#getRequestProcessorFactory(java.lang.Class)">getRequestProcessorFactory</a></strong>(<a href="http://docs.oracle.com/javase/1.3/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> pClass)</code>
<div class="block">This method is invoked at startup.</div>
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<h4>getRequestProcessorFactory</h4>
<pre><a href="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</a> getRequestProcessorFactory(<a href="http://docs.oracle.com/javase/1.3/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> pClass)
throws <a href="../../../../org/apache/xmlrpc/XmlRpcException.html" title="class in org.apache.xmlrpc">XmlRpcException</a></pre>
<div class="block">This method is invoked at startup. It creates a factory for instances of
<code>pClass</code>.</div>
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<dd><code><a href="../../../../org/apache/xmlrpc/XmlRpcException.html" title="class in org.apache.xmlrpc">XmlRpcException</a></code></dd></dl>
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