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Question: What is DispatchAction?

Answer: DispatchAction is specialized child of Struts Action class. It combines or group the methods that can further access the bussiness logic at a single place. The method can be anyone from CRUD [Create,Retrieve,Update or Delete] or it can be security check one like autheniticate user etc.
This class apart from having thread-safe execute method also can have user-defined methods.

In struts-config.xml files following changes are required for Dispatch action to work:


<action-mappings>
<action path="/login"
type ="com.....LoginAction"
name ="loginForm"
parameter ="task"
scope = "request"
validate = "false"
input = "/index.jsp">
<forward name="success" path="/jsp/common/index.jsp"/>
<forward name="loginagain" path="/index.jsp"/>
</action>
</action-mappings>


If above is your struts-config.xml file structure and LoginAction extends DispatchAction instead of normal Action class. And assuming [keep assuming] your LoginAction class have method named authenticateUser, then in your login.jsp add any hidden parameter called task with value as your method name and on submit of that page following will be the url:

http://localhost:8080/yourproject/jsp/login.jsp?login.do&task=authenticateUser

Thus if we try to combine the last part of this puzzle we get the climax at struts-config.xml file's action-mapping tag described above.
The parameter property of <action> tag have the task as it's value pointing to task variable in the request having it's value as authenticateUser
hence the framework search in the LoginAction a method called authenticateUser through reflection and forwards the execution flow to it.

This is all folks, the briallancy of Struts framework.
Note DispatchAction class is included in 1.1 version.

Submitted By: Shailesh Singh ( shaileshs @ infomaticsind . com )



Category Struts Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is DispatchAction?
Answer:

DispatchAction is specialized child of Struts Action class. It combines or group the methods that can further access the bussiness logic at a single place. The method can be anyone from CRUD [Create,Retrieve,Update or Delete] or it can be security check one like autheniticate user etc.
This class apart from having thread-safe execute method also can have user-defined methods.

In struts-config.xml files following changes are required for Dispatch action to work:


<action-mappings>
<action path="/login"
type ="com.....LoginAction"
name ="loginForm"
parameter ="task"
scope = "request"
validate = "false"
input = "/index.jsp">
<forward name="success" path="/jsp/common/index.jsp"/>
<forward name="loginagain" path="/index.jsp"/>
</action>
</action-mappings>


If above is your struts-config.xml file structure and LoginAction extends DispatchAction instead of normal Action class. And assuming [keep assuming] your LoginAction class have method named authenticateUser, then in your login.jsp add any hidden parameter called task with value as your method name and on submit of that page following will be the url:

http://localhost:8080/yourproject/jsp/login.jsp?login.do&task=authenticateUser

Thus if we try to combine the last part of this puzzle we get the climax at struts-config.xml file's action-mapping tag described above.
The parameter property of <action> tag have the task as it's value pointing to task variable in the request having it's value as authenticateUser
hence the framework search in the LoginAction a method called authenticateUser through reflection and forwards the execution flow to it.

This is all folks, the briallancy of Struts framework.
Note DispatchAction class is included in 1.1 version.

Submitted By: Shailesh Singh ( shaileshs @ infomaticsind . com ) Source: CoolInterview.com



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