InstanceEvent (Apache Tomcat 8.0.15 API Documentation)

java.lang.Object
- java.util.EventObject
- - org.apache.catalina.InstanceEvent

All Implemented Interfaces:

Serializable
```
public final class InstanceEvent
extends EventObject
```
General event for notifying listeners of significant events related to a specific instance of a Servlet, or a specific instance of a Filter, as opposed to the Wrapper component that manages it.

Author:

Craig R. McClanahan

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`AFTER_DESTROY_EVENT` The event indicating that the `destroy()` method has returned.
`static String`	`AFTER_DISPATCH_EVENT` The event indicating that the `service()` method of a servlet accessed via a request dispatcher has returned.
`static String`	`AFTER_FILTER_EVENT` The event indicating that the `doFilter()` method of a Filter has returned.
`static String`	`AFTER_INIT_EVENT` The event indicating that the `init()` method has returned.
`static String`	`AFTER_SERVICE_EVENT` The event indicating that the `service()` method has returned.
`static String`	`BEFORE_DESTROY_EVENT` The event indicating that the `destroy` method is about to be called for this instance.
`static String`	`BEFORE_DISPATCH_EVENT` The event indicating that the `service()` method of a servlet accessed via a request dispatcher is about to be called.
`static String`	`BEFORE_FILTER_EVENT` The event indicating that the `doFilter()` method of a Filter is about to be called.
`static String`	`BEFORE_INIT_EVENT` The event indicating that the `init()` method is about to be called for this instance.
`static String`	`BEFORE_SERVICE_EVENT` The event indicating that the `service()` method is about to be called on a servlet.

Fields inherited from class java.util.EventObject
source

Constructor Summary

Constructors
Constructor and Description
`InstanceEvent(Wrapper wrapper, Filter filter, String type)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Filter filter, String type, ServletRequest request, ServletResponse response)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Filter filter, String type, ServletRequest request, ServletResponse response, Throwable exception)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Filter filter, String type, Throwable exception)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Servlet servlet, String type)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Servlet servlet, String type, ServletRequest request, ServletResponse response)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Servlet servlet, String type, ServletRequest request, ServletResponse response, Throwable exception)` Construct a new InstanceEvent with the specified parameters.
`InstanceEvent(Wrapper wrapper, Servlet servlet, String type, Throwable exception)` Construct a new InstanceEvent with the specified parameters.

Method Summary

Methods
Modifier and Type	Method and Description
`Throwable`	`getException()` Return the exception that occurred during the processing that was reported by this event.
`Filter`	`getFilter()` Return the filter instance for which this event occurred.
`ServletRequest`	`getRequest()` Return the servlet request for which this event occurred.
`ServletResponse`	`getResponse()` Return the servlet response for which this event occurred.
`Servlet`	`getServlet()` Return the servlet instance for which this event occurred.
`String`	`getType()` Return the event type of this event.
`Wrapper`	`getWrapper()` Return the Wrapper managing the servlet instance for which this event occurred.

Methods inherited from class java.util.EventObject
getSource, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - BEFORE_INIT_EVENT
```
public static final String BEFORE_INIT_EVENT
```
    The event indicating that the init() method is about to be called for this instance.
    
    See Also:
    Constant Field Values
  - AFTER_INIT_EVENT
```
public static final String AFTER_INIT_EVENT
```
    The event indicating that the init() method has returned.
    
    See Also:
    Constant Field Values
  - BEFORE_SERVICE_EVENT
```
public static final String BEFORE_SERVICE_EVENT
```
    The event indicating that the service() method is about to be called on a servlet. The servlet property contains the servlet being called, and the request and response properties contain the current request and response being processed.
    
    See Also:
    Constant Field Values
  - AFTER_SERVICE_EVENT
```
public static final String AFTER_SERVICE_EVENT
```
    The event indicating that the service() method has returned. The servlet property contains the servlet that was called, and the request and response properties contain the current request and response being processed.
    
    See Also:
    Constant Field Values
  - BEFORE_DESTROY_EVENT
```
public static final String BEFORE_DESTROY_EVENT
```
    The event indicating that the destroy method is about to be called for this instance.
    
    See Also:
    Constant Field Values
  - AFTER_DESTROY_EVENT
```
public static final String AFTER_DESTROY_EVENT
```
    The event indicating that the destroy() method has returned.
    
    See Also:
    Constant Field Values
  - BEFORE_DISPATCH_EVENT
```
public static final String BEFORE_DISPATCH_EVENT
```
    The event indicating that the service() method of a servlet accessed via a request dispatcher is about to be called. The servlet property contains a reference to the dispatched-to servlet instance, and the request and response properties contain the current request and response being processed. The wrapper property will contain a reference to the dispatched-to Wrapper.
    
    See Also:
    Constant Field Values
  - AFTER_DISPATCH_EVENT
```
public static final String AFTER_DISPATCH_EVENT
```
    The event indicating that the service() method of a servlet accessed via a request dispatcher has returned. The servlet property contains a reference to the dispatched-to servlet instance, and the request and response properties contain the current request and response being processed. The wrapper property will contain a reference to the dispatched-to Wrapper.
    
    See Also:
    Constant Field Values
  - BEFORE_FILTER_EVENT
```
public static final String BEFORE_FILTER_EVENT
```
    The event indicating that the doFilter() method of a Filter is about to be called. The filter property contains a reference to the relevant filter instance, and the request and response properties contain the current request and response being processed.
    
    See Also:
    Constant Field Values
  - AFTER_FILTER_EVENT
```
public static final String AFTER_FILTER_EVENT
```
    The event indicating that the doFilter() method of a Filter has returned. The filter property contains a reference to the relevant filter instance, and the request and response properties contain the current request and response being processed.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Filter filter,
             String type)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for filter lifecycle events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    filter - Filter instance for which this event occurred
    type - Event type (required)
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Filter filter,
             String type,
             Throwable exception)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for filter lifecycle events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    filter - Filter instance for which this event occurred
    type - Event type (required)
    exception - Exception that occurred
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Filter filter,
             String type,
             ServletRequest request,
             ServletResponse response)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for filter processing events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    filter - Filter instance for which this event occurred
    type - Event type (required)
    request - Servlet request we are processing
    response - Servlet response we are processing
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Filter filter,
             String type,
             ServletRequest request,
             ServletResponse response,
             Throwable exception)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for filter processing events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    filter - Filter instance for which this event occurred
    type - Event type (required)
    request - Servlet request we are processing
    response - Servlet response we are processing
    exception - Exception that occurred
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Servlet servlet,
             String type)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for processing servlet lifecycle events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    servlet - Servlet instance for which this event occurred
    type - Event type (required)
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Servlet servlet,
             String type,
             Throwable exception)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for processing servlet lifecycle events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    servlet - Servlet instance for which this event occurred
    type - Event type (required)
    exception - Exception that occurred
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Servlet servlet,
             String type,
             ServletRequest request,
             ServletResponse response)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for processing servlet processing events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    servlet - Servlet instance for which this event occurred
    type - Event type (required)
    request - Servlet request we are processing
    response - Servlet response we are processing
  - InstanceEvent
```
public InstanceEvent(Wrapper wrapper,
             Servlet servlet,
             String type,
             ServletRequest request,
             ServletResponse response,
             Throwable exception)
```
    Construct a new InstanceEvent with the specified parameters. This constructor is used for processing servlet processing events.
    
    Parameters:
    wrapper - Wrapper managing this servlet instance
    servlet - Servlet instance for which this event occurred
    type - Event type (required)
    request - Servlet request we are processing
    response - Servlet response we are processing
    exception - Exception that occurred
- Method Detail
  - getException
```
public Throwable getException()
```
    Return the exception that occurred during the processing that was reported by this event.
  - getFilter
```
public Filter getFilter()
```
    Return the filter instance for which this event occurred.
  - getRequest
```
public ServletRequest getRequest()
```
    Return the servlet request for which this event occurred.
  - getResponse
```
public ServletResponse getResponse()
```
    Return the servlet response for which this event occurred.
  - getServlet
```
public Servlet getServlet()
```
    Return the servlet instance for which this event occurred.
  - getType
```
public String getType()
```
    Return the event type of this event.
  - getWrapper
```
public Wrapper getWrapper()
```
    Return the Wrapper managing the servlet instance for which this event occurred.

Class InstanceEvent

Field Summary

Fields inherited from class java.util.EventObject

Constructor Summary

Method Summary

Methods inherited from class java.util.EventObject

Methods inherited from class java.lang.Object

Field Detail

BEFORE_INIT_EVENT

AFTER_INIT_EVENT

BEFORE_SERVICE_EVENT

AFTER_SERVICE_EVENT

BEFORE_DESTROY_EVENT

AFTER_DESTROY_EVENT

BEFORE_DISPATCH_EVENT

AFTER_DISPATCH_EVENT

BEFORE_FILTER_EVENT

AFTER_FILTER_EVENT

Constructor Detail

InstanceEvent

InstanceEvent

InstanceEvent

InstanceEvent

InstanceEvent

InstanceEvent

InstanceEvent

InstanceEvent

Method Detail

getException

getFilter

getRequest

getResponse

getServlet

getType

getWrapper