I was working on a custom interceptor that would use the init() method to
configure itself. After some analysis I realized that the init() method was
being called multiple times per action invocation. So, I made a very simple
interceptor to test to make sure I wasn¹t crazy about this.
package net.vitarara.quadran.core.web.menu;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class TestInterceptor implements Interceptor {
public static int initCount = 0;
public void destroy () { }
public void init () {
System.err.println ("BEGIN: TestInterceptor.init()");
TestInterceptor.initCount = TestInterceptor.initCount + 1;
System.err.println ("TestInterceptor.initCount = " +
TestInterceptor.initCount);
System.err.println ("TestInterceptor = " + this.toString () );
System.err.println ("END: TestInterceptor.init()");
}
public String intercept (ActionInvocation invocation) throws Exception {
System.err.println ("BEGIN: TestInterceptor.intercept()");
String result = invocation.invoke ();
System.err.println ("END: TestInterceptor.intercept()");
return result;
}
}
Here is the struts.xml portion defining the interceptor and the stack:
<interceptors>
<interceptor name="qmenu" class="qMenuInterceptor" />
<interceptor name="testInterceptor"
class="net.vitarara.quadran.core.web.menu.TestInterceptor" />
<interceptor-stack name="defaultStack">
<interceptor-ref name="servlet-config" />
<interceptor-ref name="params" />
<interceptor-ref name="prepare" />
<interceptor-ref name="chain" />
<interceptor-ref name="model-driven" />
<!-- <interceptor-ref name="component" /> -->
<interceptor-ref name="fileUpload" />
<interceptor-ref name="static-params" />
<interceptor-ref name="params" />
<interceptor-ref name="conversionError" />
<interceptor-ref name="validation" />
<interceptor-ref name="workflow" />
<!-- <interceptor-ref name="qmenu" /> -->
<interceptor-ref name="testInterceptor" />
</interceptor-stack>
</interceptors>
Here's the log output:
11:35:40,557 INFO [STDOUT] 11:35:40,557 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-default.xml]
11:35:40,664 INFO [STDOUT] 11:35:40,664 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-plugin.xml]
11:35:40,670 INFO [STDOUT] 11:35:40,670 INFO [XmlConfigurationProvider]
Parsing configuration file [struts.xml]
11:35:40,721 ERROR [STDERR] BEGIN: TestInterceptor.init()
11:35:40,721 ERROR [STDERR] TestInterceptor.initCount = 9
11:35:40,721 ERROR [STDERR] TestInterceptor =
[EMAIL PROTECTED]
11:35:40,721 ERROR [STDERR] END: TestInterceptor.init()
11:35:40,797 INFO [STDOUT] 11:35:40,797 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-default.xml]
11:35:40,940 INFO [STDOUT] 11:35:40,940 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-plugin.xml]
11:35:40,946 INFO [STDOUT] 11:35:40,946 INFO [XmlConfigurationProvider]
Parsing configuration file [struts.xml]
11:35:40,985 ERROR [STDERR] BEGIN: TestInterceptor.init()
11:35:40,985 ERROR [STDERR] TestInterceptor.initCount = 10
11:35:40,986 ERROR [STDERR] TestInterceptor =
[EMAIL PROTECTED]
11:35:40,986 ERROR [STDERR] END: TestInterceptor.init()
11:35:41,060 ERROR [STDERR] BEGIN: TestInterceptor.intercept()
11:35:41,060 ERROR [STDERR]
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!
11:35:41,071 INFO [STDOUT] 11:35:41,071 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-default.xml]
11:35:41,191 INFO [STDOUT] 11:35:41,190 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-plugin.xml]
11:35:41,196 INFO [STDOUT] 11:35:41,196 INFO [XmlConfigurationProvider]
Parsing configuration file [struts.xml]
11:35:41,244 ERROR [STDERR] BEGIN: TestInterceptor.init()
11:35:41,244 ERROR [STDERR] TestInterceptor.initCount = 11
11:35:41,244 ERROR [STDERR] TestInterceptor =
[EMAIL PROTECTED]
11:35:41,244 ERROR [STDERR] END: TestInterceptor.init()
11:35:41,470 INFO [STDOUT] 11:35:41,470 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-default.xml]
11:35:41,630 INFO [STDOUT] 11:35:41,630 INFO [XmlConfigurationProvider]
Parsing configuration file [struts-plugin.xml]
11:35:41,644 INFO [STDOUT] 11:35:41,644 INFO [XmlConfigurationProvider]
Parsing configuration file [struts.xml]
11:35:41,720 ERROR [STDERR] BEGIN: TestInterceptor.init()
11:35:41,720 ERROR [STDERR] TestInterceptor.initCount = 12
11:35:41,721 ERROR [STDERR] TestInterceptor =
[EMAIL PROTECTED]
11:35:41,721 ERROR [STDERR] END: TestInterceptor.init()
11:35:41,737 ERROR [STDERR] END: TestInterceptor.intercept()
The ! marks are in the actions execute() method.
Looking at this log output I have a few questions:
1. It looks to me that the TestInterceptor is being instantiated multiple
times. Why?
2. Why is are the various struts xml files being parsed multiple times for a
single action invocation?
Thanks,
Mark
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