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comparison apache-xmlrpc-3.1.3/docs/apidocs/org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html @ 151:db5f735fd2b4
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date | Sat, 10 Sep 2011 04:13:50 +0900 |
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> | |
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8 RequestProcessorFactoryFactory (Apache XML-RPC 3.1.3 API) | |
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89 <!-- ======== START OF CLASS DATA ======== --> | |
90 <H2> | |
91 <FONT SIZE="-1"> | |
92 org.apache.xmlrpc.server</FONT> | |
93 <BR> | |
94 Interface RequestProcessorFactoryFactory</H2> | |
95 <DL> | |
96 <DT><B>All Known Implementing Classes:</B> <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> | |
97 </DL> | |
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99 <DL> | |
100 <DT><PRE>public interface <B>RequestProcessorFactoryFactory</B></DL> | |
101 </PRE> | |
102 | |
103 <P> | |
104 <p>The request processor is the object, which is actually performing | |
105 the request. There is nothing magic about the request processor: | |
106 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> | |
107 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. | |
108 The mapping uses this factory to create instances of | |
109 <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 | |
110 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 | |
111 factory to create the actual request processor when a request comes | |
112 in.</p> | |
113 <p>However, the question arises, when and how the request processor | |
114 is created and whether it needs request specific initialization. | |
115 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 | |
116 that logic pluggable. Unfortunately, we aren't done with a single | |
117 factory: We even need a factory for factories. The rationale is | |
118 best explained by looking at the different use cases and how to | |
119 implement them.</p> | |
120 <p>The default <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><CODE>RequestProcessorFactoryFactory</CODE></A> is the | |
121 <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 | |
122 processor instance for any request. In other words, it allows the | |
123 request processor to have some state. This is fine, if the request | |
124 processor is a lightweight object or needs request specific | |
125 initialization. In this case, the actual request processor is | |
126 created and invoked when | |
127 calling <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><CODE>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</CODE></A>.</p> | |
128 <p>An alternative implementation is the | |
129 <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 | |
130 create stateless request processors. Stateless request processors | |
131 are typically heavyweight objects, which have an expensive | |
132 initialization phase. The processor factory, which is created by | |
133 <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html#getRequestProcessorFactory(java.lang.Class)"><CODE>getRequestProcessorFactory(Class pClass)</CODE></A> contains an | |
134 initialized singleton, which is returned by | |
135 <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><CODE>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</CODE></A>.</p> | |
136 <p>Other alternatives might be a | |
137 <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html" title="interface in org.apache.xmlrpc.server"><CODE>RequestProcessorFactoryFactory</CODE></A>, which maintains a pool | |
138 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 | |
139 configured by calling | |
140 <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html#getRequestProcessor(org.apache.xmlrpc.XmlRpcRequest)"><CODE>RequestProcessorFactoryFactory.RequestProcessorFactory.getRequestProcessor(XmlRpcRequest)</CODE></A>.</p> | |
141 <P> | |
142 | |
143 <P> | |
144 <HR> | |
145 | |
146 <P> | |
147 <!-- ======== NESTED CLASS SUMMARY ======== --> | |
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156 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
157 <CODE>static interface</CODE></FONT></TD> | |
158 <TD><CODE><B><A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</A></B></CODE> | |
159 | |
160 <BR> | |
161 This is the factory for request processors.</TD> | |
162 </TR> | |
163 <TR BGCOLOR="white" CLASS="TableRowColor"> | |
164 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
165 <CODE>static class</CODE></FONT></TD> | |
166 <TD><CODE><B><A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestSpecificProcessorFactoryFactory</A></B></CODE> | |
167 | |
168 <BR> | |
169 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>.</TD> | |
170 </TR> | |
171 <TR BGCOLOR="white" CLASS="TableRowColor"> | |
172 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
173 <CODE>static class</CODE></FONT></TD> | |
174 <TD><CODE><B><A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory.html" title="class in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.StatelessProcessorFactoryFactory</A></B></CODE> | |
175 | |
176 <BR> | |
177 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>.</TD> | |
178 </TR> | |
179 </TABLE> | |
180 | |
181 <!-- ========== METHOD SUMMARY =========== --> | |
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190 <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> | |
191 <CODE> <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</A></CODE></FONT></TD> | |
192 <TD><CODE><B><A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.html#getRequestProcessorFactory(java.lang.Class)">getRequestProcessorFactory</A></B>(java.lang.Class pClass)</CODE> | |
193 | |
194 <BR> | |
195 This method is invoked at startup.</TD> | |
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198 | |
199 <P> | |
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208 </TR> | |
209 </TABLE> | |
210 | |
211 <A NAME="getRequestProcessorFactory(java.lang.Class)"><!-- --></A><H3> | |
212 getRequestProcessorFactory</H3> | |
213 <PRE> | |
214 <A HREF="../../../../org/apache/xmlrpc/server/RequestProcessorFactoryFactory.RequestProcessorFactory.html" title="interface in org.apache.xmlrpc.server">RequestProcessorFactoryFactory.RequestProcessorFactory</A> <B>getRequestProcessorFactory</B>(java.lang.Class pClass) | |
215 throws <A HREF="../../../../org/apache/xmlrpc/XmlRpcException.html" title="class in org.apache.xmlrpc">XmlRpcException</A></PRE> | |
216 <DL> | |
217 <DD>This method is invoked at startup. It creates a factory for instances of | |
218 <code>pClass</code>. | |
219 <P> | |
220 <DD><DL> | |
221 | |
222 <DT><B>Throws:</B> | |
223 <DD><CODE><A HREF="../../../../org/apache/xmlrpc/XmlRpcException.html" title="class in org.apache.xmlrpc">XmlRpcException</A></CODE></DL> | |
224 </DD> | |
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