org.apache.catalina.core

Class StandardPipeline

java.lang.Object

org.apache.catalina.util.LifecycleBase

org.apache.catalina.core.StandardPipeline

All Implemented Interfaces:

Contained, Lifecycle, Pipeline

public class StandardPipeline
extends LifecycleBase
implements Pipeline, Contained

Standard implementation of a processing Pipeline that will invoke a series of Valves that have been configured to be called in order. This implementation can be used for any type of Container. IMPLEMENTATION WARNING - This implementation assumes that no calls to addValve() or removeValve are allowed while a request is currently being processed. Otherwise, the mechanism by which per-thread state is maintained will need to be modified.

Author:

Craig R. McClanahan

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.catalina.Lifecycle

Lifecycle.SingleUse

Field Summary

Fields

Modifier and Type	Field and Description
protected Valve	basic The basic Valve (if any) associated with this Pipeline.
protected Container	container The Container with which this Pipeline is associated.
protected Valve	first The first valve associated with this Pipeline.

Fields inherited from interface org.apache.catalina.Lifecycle

AFTER_DESTROY_EVENT, AFTER_INIT_EVENT, AFTER_START_EVENT, AFTER_STOP_EVENT, BEFORE_DESTROY_EVENT, BEFORE_INIT_EVENT, BEFORE_START_EVENT, BEFORE_STOP_EVENT, CONFIGURE_START_EVENT, CONFIGURE_STOP_EVENT, PERIODIC_EVENT, START_EVENT, STOP_EVENT

Constructor Summary

Constructors

Constructor and Description
StandardPipeline() Construct a new StandardPipeline instance with no associated Container.
StandardPipeline(Container container) Construct a new StandardPipeline instance that is associated with the specified Container.

Method Summary

Modifier and Type	Method and Description
void	addValve(Valve valve) Add a new Valve to the end of the pipeline associated with this Container.
protected void	destroyInternal()
Valve	getBasic() Return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
Container	getContainer() Return the Container with which this Pipeline is associated.
Valve	getFirst()
ObjectName[]	getValveObjectNames()
Valve[]	getValves() Return the set of Valves in the pipeline associated with this Container, including the basic Valve (if any).
protected void	initInternal()
boolean	isAsyncSupported() Returns true if all the valves in this pipeline support async, false otherwise
void	removeValve(Valve valve) Remove the specified Valve from the pipeline associated with this Container, if it is found; otherwise, do nothing.
void	setBasic(Valve valve) Set the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
void	setContainer(Container container) Set the Container with which this Pipeline is associated.
protected void	startInternal() Start Valves) in this pipeline and implement the requirements of LifecycleBase.startInternal().
protected void	stopInternal() Stop Valves) in this pipeline and implement the requirements of LifecycleBase.stopInternal().
String	toString() Return a String representation of this component.

Methods inherited from class org.apache.catalina.util.LifecycleBase

addLifecycleListener, destroy, findLifecycleListeners, fireLifecycleEvent, getState, getStateName, init, removeLifecycleListener, setState, setState, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

basic

protected Valve basic

The basic Valve (if any) associated with this Pipeline.

container

protected Container container

The Container with which this Pipeline is associated.

first

protected Valve first

The first valve associated with this Pipeline.

Constructor Detail

StandardPipeline

public StandardPipeline()

Construct a new StandardPipeline instance with no associated Container.

StandardPipeline

public StandardPipeline(Container container)

Construct a new StandardPipeline instance that is associated with the specified Container.

Parameters:

container - The container we should be associated with

Method Detail

isAsyncSupported

public boolean isAsyncSupported()

Description copied from interface: Pipeline

Returns true if all the valves in this pipeline support async, false otherwise

Specified by:

isAsyncSupported in interface Pipeline

Returns:

true if all the valves in this pipeline support async, false otherwise

getContainer

public Container getContainer()

Return the Container with which this Pipeline is associated.

Specified by:

getContainer in interface Contained

Specified by:

getContainer in interface Pipeline

Returns:

the Container with which this Pipeline is associated.

setContainer

public void setContainer(Container container)

Set the Container with which this Pipeline is associated.

Specified by:

setContainer in interface Contained

Specified by:

setContainer in interface Pipeline

Parameters:

container - The new associated container

initInternal

protected void initInternal()

Specified by:

initInternal in class LifecycleBase

startInternal

protected void startInternal()
                      throws LifecycleException

Start Valves) in this pipeline and implement the requirements of LifecycleBase.startInternal().

Specified by:

startInternal in class LifecycleBase

Throws:

LifecycleException - if this component detects a fatal error that prevents this component from being used

stopInternal

protected void stopInternal()
                     throws LifecycleException

Stop Valves) in this pipeline and implement the requirements of LifecycleBase.stopInternal().

Specified by:

stopInternal in class LifecycleBase

Throws:

LifecycleException - if this component detects a fatal error that prevents this component from being used

destroyInternal

protected void destroyInternal()

Specified by:

destroyInternal in class LifecycleBase

toString

public String toString()

Return a String representation of this component.

Overrides:

toString in class Object

getBasic

public Valve getBasic()

Return the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).

Specified by:

getBasic in interface Pipeline

Returns:

the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).

setBasic

public void setBasic(Valve valve)

Set the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any). Prior to setting the basic Valve, the Valve's setContainer() will be called, if it implements Contained, with the owning Container as an argument. The method may throw an IllegalArgumentException if this Valve chooses not to be associated with this Container, or IllegalStateException if it is already associated with a different Container.

Specified by:

setBasic in interface Pipeline

Parameters:

valve - Valve to be distinguished as the basic Valve

addValve

public void addValve(Valve valve)

Add a new Valve to the end of the pipeline associated with this Container. Prior to adding the Valve, the Valve's setContainer() method will be called, if it implements Contained, with the owning Container as an argument. The method may throw an IllegalArgumentException if this Valve chooses not to be associated with this Container, or IllegalStateException if it is already associated with a different Container.

Specified by:

addValve in interface Pipeline

Parameters:

valve - Valve to be added

Throws:

IllegalArgumentException - if this Container refused to accept the specified Valve

IllegalArgumentException - if the specified Valve refuses to be associated with this Container

IllegalStateException - if the specified Valve is already associated with a different Container

getValves

public Valve[] getValves()

Return the set of Valves in the pipeline associated with this Container, including the basic Valve (if any). If there are no such Valves, a zero-length array is returned.

Specified by:

getValves in interface Pipeline

Returns:

the set of Valves in the pipeline associated with this Container, including the basic Valve (if any). If there are no such Valves, a zero-length array is returned.

getValveObjectNames

public ObjectName[] getValveObjectNames()

removeValve

public void removeValve(Valve valve)

Remove the specified Valve from the pipeline associated with this Container, if it is found; otherwise, do nothing. If the Valve is found and removed, the Valve's setContainer(null) method will be called if it implements Contained.

Specified by:

removeValve in interface Pipeline

Parameters:

valve - Valve to be removed

getFirst

public Valve getFirst()

Specified by:

getFirst in interface Pipeline

Returns:

the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).