StandardWrapper (Catalina Internal API Documentation)
Keywords: org.apache.catalina.core.StandardWrapper class

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## org.apache.catalina.core
Class StandardWrapper

    java.lang.Object
      org.apache.catalina.core.ContainerBase
          org.apache.catalina.core.StandardWrapper

All Implemented Interfaces:
  Container, Lifecycle, Pipeline, javax.servlet.ServletConfig, Wrapper

public final class StandardWrapper
extends ContainerBase
implements javax.servlet.ServletConfig, Wrapper

Standard implementation of the Wrapper interface that represents an individual servlet definition. No child Containers are allowed, and the parent Container must be a Context.

Version:
  $Revision: 434283 $ $Date: 2006-08-23 21:57:51 -0400 (Wed, 23 Aug 2006) $
Author:
  Craig R. McClanahan, Remy Maucherat

Nested Class Summary

Nested classes inherited from class org.apache.catalina.core.ContainerBase
`ContainerBase.PrivilegedAddChild`

Field Summary

Fields inherited from class org.apache.catalina.core.ContainerBase
`children, cluster, lifecycle, listeners, loader, logger, manager, mapper, mapperClass, mappers, name, parent, parentClassLoader, pipeline, realm, resources, sm, started, support`

Fields inherited from interface org.apache.catalina.Container
`ADD_CHILD_EVENT, ADD_MAPPER_EVENT, ADD_VALVE_EVENT, REMOVE_CHILD_EVENT, REMOVE_MAPPER_EVENT, REMOVE_VALVE_EVENT`

Fields inherited from interface org.apache.catalina.Lifecycle
`AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, START_EVENT, STOP_EVENT`

Constructor Summary
`StandardWrapper()` Create a new StandardWrapper component with the default basic Valve.

Method Summary
`void` | `addChild(Container child)` Refuse to add a child Container, because Wrappers are the lowest level of the Container hierarchy.
`protected void` | `addDefaultMapper(java.lang.String mapperClass)` Add a default Mapper implementation if none have been configured explicitly.
`void` | `addInitParameter(java.lang.String name, java.lang.String value)` Add a new servlet initialization parameter for this servlet.
`void` | `addInstanceListener(InstanceListener listener)` Add a new listener interested in InstanceEvents.
`void` | `addSecurityReference(java.lang.String name, java.lang.String link)` Add a new security role reference record to the set of records for this servlet.
`javax.servlet.Servlet` | `allocate()` Allocate an initialized instance of this Servlet that is ready to have its `service()` method called.
`void` | `deallocate(javax.servlet.Servlet servlet)` Return this previously allocated servlet to the pool of available instances.
`java.lang.String` | `findInitParameter(java.lang.String name)` Return the value for the specified initialization parameter name, if any; otherwise return `null`.
`java.lang.String[]` | `findInitParameters()` Return the names of all defined initialization parameters for this servlet.
`java.lang.String` | `findSecurityReference(java.lang.String name)` Return the security role link for the specified security role reference name, if any; otherwise return `null`.
`java.lang.String[]` | `findSecurityReferences()` Return the set of security role reference names associated with this servlet, if any; otherwise return a zero-length array.
`long` | `getAvailable()` Return the available date/time for this servlet, in milliseconds since the epoch.
`int` | `getCountAllocated()` Return the number of active allocations of this servlet, even if they are all for the same instance (as will be true for servlets that do not implement `SingleThreadModel`.
`int` | `getDebug()` Return the debugging detail level for this component.
`int` | `getErrorCount()`
`java.lang.String` | `getInfo()` Return descriptive information about this Container implementation and the corresponding version number, in the format `<description>/<version>`.
`java.lang.String` | `getInitParameter(java.lang.String name)` Return the initialization parameter value for the specified name, if any; otherwise return `null`.
`java.util.Enumeration` | `getInitParameterNames()` Return the set of initialization parameter names defined for this servlet.
`InstanceSupport` | `getInstanceSupport()` Return the InstanceSupport object for this Wrapper instance.
`java.lang.String` | `getJspFile()` Return the context-relative URI of the JSP file for this servlet.
`int` | `getLoadOnStartup()` Return the load-on-startup order value (negative value means load on first call).
`int` | `getMaxInstances()` Return maximum number of instances that will be allocated when a single thread model servlet is used.
`long` | `getMaxTime()`
`long` | `getProcessingTime()`
`int` | `getRequestCount()`
`java.lang.String` | `getRunAs()` Return the run-as identity for this servlet.
`java.lang.String` | `getServletClass()` Return the fully qualified servlet class name for this servlet.
`javax.servlet.ServletContext` | `getServletContext()` Return the servlet context with which this servlet is associated.
`java.lang.String` | `getServletName()` Return the name of this servlet.
`boolean` | `isSingleThreadModel()` Return `true` if the servlet class represented by this component implements the `SingleThreadModel` interface.
`boolean` | `isUnavailable()` Is this servlet currently unavailable?
`void` | `load()` Load and initialize an instance of this servlet, if there is not already at least one initialized instance.
`javax.servlet.Servlet` | `loadServlet()` Load and initialize an instance of this servlet, if there is not already at least one initialized instance.
`protected java.lang.String` | `logName()` Log the abbreviated name of this Container for logging messages.
`void` | `removeInitParameter(java.lang.String name)` Remove the specified initialization parameter from this servlet.
`void` | `removeInstanceListener(InstanceListener listener)` Remove a listener no longer interested in InstanceEvents.
`void` | `removeSecurityReference(java.lang.String name)` Remove any security role reference for the specified role name.
`void` | `setAvailable(long available)` Set the available date/time for this servlet, in milliseconds since the epoch.
`void` | `setDebug(int debug)` Set the debugging detail level for this component.
`void` | `setErrorCount(int errorCount)`
`void` | `setJspFile(java.lang.String jspFile)` Set the context-relative URI of the JSP file for this servlet.
`void` | `setLoadOnStartup(int value)` Set the load-on-startup order value (negative value means load on first call).
`void` | `setLoadOnStartupString(java.lang.String value)` Set the load-on-startup order value from a (possibly null) string.
`void` | `setMaxInstances(int maxInstances)` Set the maximum number of instances that will be allocated when a single thread model servlet is used.
`void` | `setMaxTime(long maxTime)`
`void` | `setParent(Container container)` Set the parent Container of this Wrapper, but only if it is a Context.
`void` | `setProcessingTime(long processingTime)`
`void` | `setRequestCount(int requestCount)`
`void` | `setRunAs(java.lang.String runAs)` Set the run-as identity for this servlet.
`void` | `setServletClass(java.lang.String servletClass)` Set the fully qualified servlet class name for this servlet.
`void` | `setServletName(java.lang.String name)` Set the name of this servlet.
`void` | `start()` Start this component, pre-loading the servlet if the load-on-startup value is set appropriately.
`void` | `stop()` Stop this component, gracefully shutting down the servlet if it has been initialized.
`java.lang.String` | `toString()` Return a String representation of this component.
`void` | `unavailable(javax.servlet.UnavailableException unavailable)` Process an UnavailableException, marking this servlet as unavailable for the specified amount of time.
`void` | `unload()` Unload all initialized instances of this servlet, after calling the `destroy()` method for each instance.

Methods inherited from class org.apache.catalina.core.ContainerBase
`addContainerListener, addLifecycleListener, addMapper, addPropertyChangeListener, addValve, findChild, findChildren, findContainerListeners, findLifecycleListeners, findMapper, findMappers, fireContainerEvent, getBasic, getCluster, getLoader, getLogger, getManager, getName, getParent, getParentClassLoader, getPipeline, getRealm, getResources, getValves, invoke, log, log, map, removeChild, removeContainerListener, removeLifecycleListener, removeMapper, removePropertyChangeListener, removeValve, setBasic, setCluster, setLoader, setLogger, setManager, setName, setParentClassLoader, setRealm, setResources`

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

Methods inherited from interface org.apache.catalina.Container
`addContainerListener, addMapper, addPropertyChangeListener, findChild, findChildren, findContainerListeners, findMapper, findMappers, getCluster, getLoader, getLogger, getManager, getName, getParent, getParentClassLoader, getRealm, getResources, invoke, map, removeChild, removeContainerListener, removeMapper, removePropertyChangeListener, setCluster, setLoader, setLogger, setManager, setName, setParentClassLoader, setRealm, setResources`

Constructor Detail

### StandardWrapper

    public StandardWrapper()

  Create a new StandardWrapper component with the default basic Valve.

Method Detail

### getAvailable

    public long getAvailable()

  Return the available date/time for this servlet, in milliseconds since the epoch. If this date/time is in the future, any request for this servlet will return an SC_SERVICE_UNAVAILABLE error. If it is zero, the servlet is currently available. A value equal to Long.MAX_VALUE is considered to mean that unavailability is permanent.

  Specified by:
    `getAvailable` in interface `Wrapper`

### setAvailable

    public void setAvailable(long available)

  Set the available date/time for this servlet, in milliseconds since the epoch. If this date/time is in the future, any request for this servlet will return an SC_SERVICE_UNAVAILABLE error.

  Specified by:
    `setAvailable` in interface `Wrapper`
  Parameters:
    `available` - The new available date/time

### getCountAllocated

    public int getCountAllocated()

  Return the number of active allocations of this servlet, even if they are all for the same instance (as will be true for servlets that do not implement `SingleThreadModel`.

### getDebug

    public int getDebug()

  Return the debugging detail level for this component.

  Overrides:
    `getDebug` in class `ContainerBase`

### setDebug

    public void setDebug(int debug)

  Set the debugging detail level for this component.

  Overrides:
    `setDebug` in class `ContainerBase`
  Parameters:
    `debug` - The new debugging detail level

### getInfo

    public java.lang.String getInfo()

  Return descriptive information about this Container implementation and the corresponding version number, in the format `<description>/<version>`.

  Specified by:
    `getInfo` in interface `Container`
  Specified by:
    `getInfo` in class `ContainerBase`

### getInstanceSupport

    public InstanceSupport getInstanceSupport()

  Return the InstanceSupport object for this Wrapper instance.

### getJspFile

    public java.lang.String getJspFile()

  Return the context-relative URI of the JSP file for this servlet.

  Specified by:
    `getJspFile` in interface `Wrapper`

### setJspFile

    public void setJspFile(java.lang.String jspFile)

  Set the context-relative URI of the JSP file for this servlet.

  Specified by:
    `setJspFile` in interface `Wrapper`
  Parameters:
    `jspFile` - JSP file URI

### getLoadOnStartup

    public int getLoadOnStartup()

  Return the load-on-startup order value (negative value means load on first call).

  Specified by:
    `getLoadOnStartup` in interface `Wrapper`

### setLoadOnStartup

    public void setLoadOnStartup(int value)

  Set the load-on-startup order value (negative value means load on first call).

  Specified by:
    `setLoadOnStartup` in interface `Wrapper`
  Parameters:
    `value` - New load-on-startup value

### setLoadOnStartupString

    public void setLoadOnStartupString(java.lang.String value)

  Set the load-on-startup order value from a (possibly null) string. Per the specification, any missing or non-numeric value is converted to a zero, so that this servlet will still be loaded at startup time, but in an arbitrary order.

  Parameters:
    `value` - New load-on-startup value

### getMaxInstances

    public int getMaxInstances()

  Return maximum number of instances that will be allocated when a single thread model servlet is used.

### setMaxInstances

    public void setMaxInstances(int maxInstances)

  Set the maximum number of instances that will be allocated when a single thread model servlet is used.

  Parameters:
    `maxInstances` - New value of maxInstances

### setParent

    public void setParent(Container container)

  Set the parent Container of this Wrapper, but only if it is a Context.

  Specified by:
    `setParent` in interface `Container`
  Overrides:
    `setParent` in class `ContainerBase`
  Parameters:
    `container` - Proposed parent Container

### getRunAs

    public java.lang.String getRunAs()

  Return the run-as identity for this servlet.

  Specified by:
    `getRunAs` in interface `Wrapper`

### setRunAs

    public void setRunAs(java.lang.String runAs)

  Set the run-as identity for this servlet.

  Specified by:
    `setRunAs` in interface `Wrapper`
  Parameters:
    `runAs` - New run-as identity value

### getServletClass

    public java.lang.String getServletClass()

  Return the fully qualified servlet class name for this servlet.

  Specified by:
    `getServletClass` in interface `Wrapper`

### setServletClass

    public void setServletClass(java.lang.String servletClass)

  Set the fully qualified servlet class name for this servlet.

  Specified by:
    `setServletClass` in interface `Wrapper`
  Parameters:
    `servletClass` - Servlet class name

### setServletName

    public void setServletName(java.lang.String name)

  Set the name of this servlet. This is an alias for the normal `Container.setName()` method, and complements the `getServletName()` method required by the `ServletConfig` interface.

  Parameters:
    `name` - The new name of this servlet

### isSingleThreadModel

    public boolean isSingleThreadModel()

  Return `true` if the servlet class represented by this component implements the `SingleThreadModel` interface.

### isUnavailable

    public boolean isUnavailable()

  Is this servlet currently unavailable?

  Specified by:
    `isUnavailable` in interface `Wrapper`

### addChild

    public void addChild(Container child)

  Refuse to add a child Container, because Wrappers are the lowest level of the Container hierarchy.

  Specified by:
    `addChild` in interface `Container`
  Overrides:
    `addChild` in class `ContainerBase`
  Parameters:
    `child` - Child container to be added

### addInitParameter

    public void addInitParameter(java.lang.String name,
                                 java.lang.String value)

  Add a new servlet initialization parameter for this servlet.

  Specified by:
    `addInitParameter` in interface `Wrapper`
  Parameters:
    `name` - Name of this initialization parameter to add
    `value` - Value of this initialization parameter to add

### addInstanceListener

    public void addInstanceListener(InstanceListener listener)

  Add a new listener interested in InstanceEvents.

  Specified by:
    `addInstanceListener` in interface `Wrapper`
  Parameters:
    `listener` - The new listener

### addSecurityReference

    public void addSecurityReference(java.lang.String name,
                                     java.lang.String link)

  Add a new security role reference record to the set of records for this servlet.

  Specified by:
    `addSecurityReference` in interface `Wrapper`
  Parameters:
    `name` - Role name used within this servlet
    `link` - Role name used within the web application

### allocate

    public javax.servlet.Servlet allocate()
                                   throws javax.servlet.ServletException

  Allocate an initialized instance of this Servlet that is ready to have its `service()` method called. If the servlet class does not implement `SingleThreadModel`, the (only) initialized instance may be returned immediately. If the servlet class implements `SingleThreadModel`, the Wrapper implementation must ensure that this instance is not allocated again until it is deallocated by a call to `deallocate()`.

  Specified by:
    `allocate` in interface `Wrapper`
  Throws:
    `javax.servlet.ServletException` - if the servlet init() method threw an exception
    `javax.servlet.ServletException` - if a loading error occurs

### deallocate

    public void deallocate(javax.servlet.Servlet servlet)
                    throws javax.servlet.ServletException

  Return this previously allocated servlet to the pool of available instances. If this servlet class does not implement SingleThreadModel, no action is actually required.

  Specified by:
    `deallocate` in interface `Wrapper`
  Parameters:
    `servlet` - The servlet to be returned
  Throws:
    `javax.servlet.ServletException` - if a deallocation error occurs

### findInitParameter

    public java.lang.String findInitParameter(java.lang.String name)

  Return the value for the specified initialization parameter name, if any; otherwise return `null`.

  Specified by:
    `findInitParameter` in interface `Wrapper`
  Parameters:
    `name` - Name of the requested initialization parameter

### findInitParameters

    public java.lang.String[] findInitParameters()

  Return the names of all defined initialization parameters for this servlet.

  Specified by:
    `findInitParameters` in interface `Wrapper`

### findSecurityReference

    public java.lang.String findSecurityReference(java.lang.String name)

  Return the security role link for the specified security role reference name, if any; otherwise return `null`.

  Specified by:
    `findSecurityReference` in interface `Wrapper`
  Parameters:
    `name` - Security role reference used within this servlet

### findSecurityReferences

    public java.lang.String[] findSecurityReferences()

  Return the set of security role reference names associated with this servlet, if any; otherwise return a zero-length array.

  Specified by:
    `findSecurityReferences` in interface `Wrapper`

### load

    public void load()
              throws javax.servlet.ServletException

  Load and initialize an instance of this servlet, if there is not already at least one initialized instance. This can be used, for example, to load servlets that are marked in the deployment descriptor to be loaded at server startup time.

  IMPLEMENTATION NOTE: Servlets whose classnames begin with `org.apache.catalina.` (so-called "container" servlets) are loaded by the same classloader that loaded this class, rather than the classloader for the current web application. This gives such classes access to Catalina internals, which are prevented for classes loaded for web applications.

  Specified by:
    `load` in interface `Wrapper`
  Throws:
    `javax.servlet.ServletException` - if the servlet init() method threw an exception
    `javax.servlet.ServletException` - if some other loading problem occurs

### loadServlet

    public javax.servlet.Servlet loadServlet()
                                      throws javax.servlet.ServletException

  Load and initialize an instance of this servlet, if there is not already at least one initialized instance. This can be used, for example, to load servlets that are marked in the deployment descriptor to be loaded at server startup time.

  Throws:
    `javax.servlet.ServletException`

### removeInitParameter

    public void removeInitParameter(java.lang.String name)

  Remove the specified initialization parameter from this servlet.

  Specified by:
    `removeInitParameter` in interface `Wrapper`
  Parameters:
    `name` - Name of the initialization parameter to remove

### removeInstanceListener

    public void removeInstanceListener(InstanceListener listener)

  Remove a listener no longer interested in InstanceEvents.

  Specified by:
    `removeInstanceListener` in interface `Wrapper`
  Parameters:
    `listener` - The listener to remove

### removeSecurityReference

    public void removeSecurityReference(java.lang.String name)

  Remove any security role reference for the specified role name.

  Specified by:
    `removeSecurityReference` in interface `Wrapper`
  Parameters:
    `name` - Security role used within this servlet to be removed

### toString

    public java.lang.String toString()

  Return a String representation of this component.

### unavailable

    public void unavailable(javax.servlet.UnavailableException unavailable)

  Process an UnavailableException, marking this servlet as unavailable for the specified amount of time.

  Specified by:
    `unavailable` in interface `Wrapper`
  Parameters:
    `unavailable` - The exception that occurred, or `null` to mark this servlet as permanently unavailable

### unload

    public void unload()
                throws javax.servlet.ServletException

  Unload all initialized instances of this servlet, after calling the `destroy()` method for each instance. This can be used, for example, prior to shutting down the entire servlet engine, or prior to reloading all of the classes from the Loader associated with our Loader's repository.

  Specified by:
    `unload` in interface `Wrapper`
  Throws:
    `javax.servlet.ServletException` - if an exception is thrown by the destroy() method

### getInitParameter

    public java.lang.String getInitParameter(java.lang.String name)

  Return the initialization parameter value for the specified name, if any; otherwise return `null`.

  Specified by:
    `getInitParameter` in interface `javax.servlet.ServletConfig`
  Parameters:
    `name` - Name of the initialization parameter to retrieve

### getInitParameterNames

    public java.util.Enumeration getInitParameterNames()

  Return the set of initialization parameter names defined for this servlet. If none are defined, an empty Enumeration is returned.

  Specified by:
    `getInitParameterNames` in interface `javax.servlet.ServletConfig`

### getServletContext

    public javax.servlet.ServletContext getServletContext()

  Return the servlet context with which this servlet is associated.

  Specified by:
    `getServletContext` in interface `javax.servlet.ServletConfig`

### getServletName

    public java.lang.String getServletName()

  Return the name of this servlet.

  Specified by:
    `getServletName` in interface `javax.servlet.ServletConfig`

### addDefaultMapper

    protected void addDefaultMapper(java.lang.String mapperClass)

  Add a default Mapper implementation if none have been configured explicitly.

  Overrides:
    `addDefaultMapper` in class `ContainerBase`
  Parameters:
    `mapperClass` - Java class name of the default Mapper

### logName

    protected java.lang.String logName()

  Log the abbreviated name of this Container for logging messages.

  Overrides:
    `logName` in class `ContainerBase`

### start

    public void start()
               throws LifecycleException

  Start this component, pre-loading the servlet if the load-on-startup value is set appropriately.

  Specified by:
    `start` in interface `Lifecycle`
  Overrides:
    `start` in class `ContainerBase`
  Throws:
    `LifecycleException` - if a fatal error occurs during startup

### stop

    public void stop()
              throws LifecycleException

  Stop this component, gracefully shutting down the servlet if it has been initialized.

  Specified by:
    `stop` in interface `Lifecycle`
  Overrides:
    `stop` in class `ContainerBase`
  Throws:
    `LifecycleException` - if a fatal error occurs during shutdown

### getProcessingTime

    public long getProcessingTime()

### setProcessingTime

    public void setProcessingTime(long processingTime)

### getMaxTime

    public long getMaxTime()

### setMaxTime

    public void setMaxTime(long maxTime)

### getRequestCount

    public int getRequestCount()

### setRequestCount

    public void setRequestCount(int requestCount)

### getErrorCount

    public int getErrorCount()

### setErrorCount

    public void setErrorCount(int errorCount)

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