Thanks Oleg. Can you give me a detsiled step-by-step from the point a form
is submitted until the Action perform().
----- Original Message -----
From: "Oleg V Alexeev" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Jonathan Asbell" <[EMAIL PROTECTED]>
Sent: Wednesday, June 13, 2001 3:33 PM
Subject: Re[2]: New BeanFactory build
> Hello Jonathan,
>
> It is easy stuff. 8) For me, of course, but not for another people,
> because it lives in my head... Now I trying to write documentation for
> bean-factory - hard work really. One little step to implement idea in
> code and another - great step - to describe it in clear manner.
>
> Main idea is to build common mechanism to declare bean descriptions in
> config file and generate it automatically at request processing.
> Core class is BeanFactoryServlet - it extends ActionServlet, defines
> additional digester calls and overload
> ActionServlet.processPreprocess() method. New version of this method
> do all work to generate beans after form processing and before action
> calling.
>
> There are exists such abstractions as -
>
> 1. factory - class to generate beans
> 2. template - bean description
> 3. parameter - parameter decribtion for the bean-template
> 4. registration - subscribtion to bean generation in action mapping
> 5. parameter-value - setter for parameter in registration
>
> Here is a sample config with comments -
>
> <struts-config>
>
> <data-sources>
>
> <data-source
> autoCommit="false"
> description="INET"
> driverClass="COM.ibm.db2.jdbc.app.DB2Driver"
> url="jdbc:db2:TEST"
> maxCount="3"
> minCount="1">
> <set-property property="user" value="tester"/>
> <set-property property="password" value="test"/>
> </data-source>
>
> </data-sources>
>
> <!-- Bean factories list. Each bean factory implement its own logic
> and sometimes uses its own parameter set. -->
>
> <bean-factories>
>
> <!-- Simple factory - collect all parameters, search constructor
> for this parameters and create bean. Really simple. -->
>
> <factory name="simple" type="org.apache.struts.factory.SimpleFactory"/>
>
> <!-- JDBC family factories. All it uses struts data-source. Data
> source can be specified by dataSource attribute. If none
> specified then default data source name will be used. First
> parameter for bean, generated by this factories must be string
> with SQL query. SQL query can has parameters. All parameters
> (if exists in parameters list for the bean) after first
> parameter (SQL query) treated as placeholders for prepared
> statement. Factory binds it to the query, execute query and...
> And result of this query must be processed by the concrete
> factory in its own manner. Every class of this family uses
> common strategy to process row of data and store values from
> it - bean of target type must implement DataBean interface and
> define populateFrom(ResultSet) method for data retrieving. -->
>
> <!-- Array factory. Walk throw result set and fill ArrayList with
> beans of target type. For every row it creates bean, call for
> it populateFrom(ResultSet) method and save it in the
> ArrayList. This factory copy all result set to the ArrayList
> and return it as result. -->
>
> <factory name="arrayJDBC"
> type="org.apache.struts.factory.jdbc.JDBCArrayFactory"
>
className="org.apache.struts.factory.jdbc.JDBCFactoryMapping"/>
>
> <!-- Slide factory. Cut from the result set window of rows and
> store it ArrayList as beans of target type (call
> populateFrom(ResultSet) to fill bean with values). Result is
> special container - object of Slide class. It store link to
> ArrayList, offset of the window in result set length of
> the window and total length of the result set.
> This factory can be used for result set 'slicing' to
> view it page by page via jsp pages. There are exists special
> tag in this package - pager - to display rows in such manner.
> Bean templates for this factory must define two parameters of
> Integer type after SQL query - offset and pageSize.
> -->
>
> <factory name="slideJDBC"
> type="org.apache.struts.factory.jdbc.JDBCSlideFactory"
>
className="org.apache.struts.factory.jdbc.JDBCFactoryMapping"/>
>
> <!-- Single bean factory. Retrieve first row from the result set,
> create bean, call populateFrom(ResultSet) for this bean and
> return bean as result. -->
>
> <factory name="singleJDBC"
> type="org.apache.struts.factory.jdbc.JDBCSingleFactory"
>
className="org.apache.struts.factory.jdbc.JDBCFactoryMapping"/>
> </bean-factories>
>
> <!-- Bean templates. Each bean template defines pattern to be used
> in factory - type of the target bean, name, parameter set. Each
> factory can interpret bean template by its own way. For each
parameter
> can be specified default value and source to retrieve value for
> this parameter.
>
> Available sources for parameters -
>
> request.parameter - parameter of the request by name from
> name attribute from parameterMapping
> request or request.attribute - attribute from request named
> by name from name attribute from
> parameterMapping
> session or session.attribute - attribute from
> session named by name from name attribute
> from parameterMapping
> application or application.attribute - attribute from
> application scope named by name from name
> attribute from parameterMapping
> application.property - value of the servlet property named by
> name from name attribute from
> parameterMapping
> form or form.property - value from mapped to this action
> form, if exists one. Name attribute
> from parameterMapping used as name of the
> property. -->
>
> <bean-templates>
>
> <!-- Bean template to retrive single row. First parameter is SQL
> query (has attribute force to avoid values from request,
> session or another sources) and second parameter is id of the
> document and must be retrieved from source "request.parameter"
> - default source if none source specified. -->
>
> <bean-template name="sample" type="bf.beans.Sample">
> <parameter
> name="query"
> type="java.lang.String"
> value="select * from bf.sample where id = ?"
> force="true"/>
> <parameter name="docId" type="java.lang.Integer"/>
> </bean-template>
>
> <!-- List of beans of bf.beans.Sample type. This bean template
> intended to be used in JDBCArrayFactory. -->
>
> <bean-template name="sampleList" type="bf.beans.Sample">
> <parameter
> name="query"
> type="java.lang.String"
> value="SELECT id, name FROM bf.sample"
> force="true"/>
> </bean-template>
>
> <!-- Sample of the bean template for the slide factory. -->
>
> <bean-template name="sampleSlide" type="bf.beans.Sample">
> <parameter
> name="query"
> type="java.lang.String"
> value="SELECT id, name FROM bf.sample"
> force="true"/>
> <parameter name="offset" type="java.lang.Integer" value="8"/>
> <parameter name="pageSize" type="java.lang.Integer" value="12"/>
> </bean-template>
>
> <!-- Sample of the bean template with parametrized SQL query. For
> the "level" attribute default value 6 is specified. This value
> will be used if none will be found in default source -
> 'request.parameter'.-->
>
> <bean-template name="sampleParList" type="bf.beans.Sample">
> <parameter
> name="query"
> type="java.lang.String"
> value="SELECT id, name FROM bf.sample where id > ?"
> force="true"/>
> <parameter name="level" type="java.lang.String" value="6"/>
> </bean-template>
> </bean-templates>
>
>
> <!-- ========== Global Forward Definitions
============================== -->
>
> <global-forwards>
>
> <forward name="index" path="/index.jsp"/>
> <forward name="array" path="/array.do"/>
> <forward name="pager" path="/pager.do"/>
> <forward name="slide" path="/slide.do"/>
> <forward name="single" path="/single.do"/>
> <forward name="parameter" path="/parameter.do"/>
>
> </global-forwards>
>
> <!-- ========== Action Mapping Definitions
============================== -->
>
> <!-- For any action mapping we can define bean registraions. Bean
> registration is link between factory and bean-template. -->
>
> <action-mappings>
>
> <action path="/array"
> type="org.apache.struts.actions.ViewAction">
>
> <!-- This registration uses 'alias' attribute (name to store
> bean in target scope, if none specified then name
> attribute will be used) and flag 'necessary' - if bean
> was not created then error will be generated. Bean can be
> saved in request or session scope. There is 'scope'
> attribute for this purpose. -->
>
> <bean name="sampleList" alias="list" factory="arrayJDBC"
necessary="true"/>
> <forward name="view" path="/sample.jsp"/>
> </action>
>
> <action path="/pager"
> type="org.apache.struts.actions.ViewAction">
> <bean name="samplePager" alias="slide" factory="slideJDBC"
necessary="true"/>
> <forward name="view" path="/pager.jsp"/>
> </action>
>
> <action path="/slide"
> type="org.apache.struts.actions.ViewAction">
> <bean name="sampleSlide" alias="slide" factory="slideJDBC"
necessary="true"/>
> <forward name="view" path="/sample.jsp"/>
> </action>
>
> <action path="/single"
> type="org.apache.struts.actions.ViewAction">
> <bean name="sample" alias="item" factory="singleJDBC"
necessary="true"/>
> <forward name="view" path="/single.jsp"/>
> </action>
>
> <action path="/parameter"
> type="org.apache.struts.actions.ViewAction">
> <bean name="sampleParList" alias="list" factory="arrayJDBC"
necessary="true"/>
> <forward name="view" path="/sample.jsp"/>
> </action>
>
> </struts-config>
>
>
> Wednesday, June 13, 2001, 4:56:27 PM, you wrote:
>
> JA> Hello Oleg.
> JA> I have been following your progress on your bean-factory, and have
> JA> downloaded the classes. However, I still have not fully grasped what
it is
> JA> substituting in struts, and what the sequence of events is when they
are
> JA> called and used. Could you provide a brief summary and sequence of
events?
> JA> I was not able to get a complete picture of what is happening from the
> JA> earlier e-mails to the list.
>
> JA> Sincerely
> JA> Jonathan
>
> JA> ----- Original Message -----
> JA> From: "Oleg V Alexeev" <[EMAIL PROTECTED]>
> JA> To: <[EMAIL PROTECTED]>
> JA> Sent: Wednesday, June 13, 2001 8:29 AM
> JA> Subject: New BeanFactory build
>
>
> >> Hello struts-dev,
> >>
> >> This day (13 June) I place new build of BeanFactory (Struts extension
> >> to support unattended bean generation at pre action processing)
> >>
> >> Last additions - hard parameter setters for bean registrations, new
> >> Pager version, new PagerTag class - wrapper around Pager class (sample
> >> of using in pager.jsp in sample application).
> >>
> >> You can review it here -
> >>
> >> http://www.sura.ru/~gonza/bean-factory/
> >>
> >> --
> >> Best regards,
> >> Oleg mailto:[EMAIL PROTECTED]
> >>
> >>
>
>
>
> --
> Best regards,
> Oleg mailto:[EMAIL PROTECTED]
>
>
