Pipeline (Apache Tomcat 8.0.53 API Documentation)

All Known Implementing Classes:

StandardPipeline
```
public interface Pipeline
```
Interface describing a collection of Valves that should be executed in sequence when the invoke() method is invoked. It is required that a Valve somewhere in the pipeline (usually the last one) must process the request and create the corresponding response, rather than trying to pass the request on.

There is generally a single Pipeline instance associated with each Container. The container's normal request processing functionality is generally encapsulated in a container-specific Valve, which should always be executed at the end of a pipeline. To facilitate this, the setBasic() method is provided to set the Valve instance that will always be executed last. Other Valves will be executed in the order that they were added, before the basic Valve is executed.

Author:

Craig R. McClanahan, Peter Donald

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addValve(Valve valve)` Add a new Valve to the end of the pipeline associated with this Container.
`Valve`	`getBasic()`
`Container`	`getContainer()`
`Valve`	`getFirst()`
`Valve[]`	`getValves()`
`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.

- Method Detail
  - getBasic
```
Valve getBasic()
```
    Returns:
    the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
  - setBasic
```
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.
    
    Parameters:
    valve - Valve to be distinguished as the basic Valve
  - addValve
```
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.
    
    Implementation note: Implementations are expected to trigger the Container.ADD_VALVE_EVENT for the associated container if this call is successful.
    
    Parameters:
    valve - Valve to be added
    
    Throws:
    
    java.lang.IllegalArgumentException - if this Container refused to accept the specified Valve
    
    java.lang.IllegalArgumentException - if the specified Valve refuses to be associated with this Container
    
    java.lang.IllegalStateException - if the specified Valve is already associated with a different Container
  - getValves
```
Valve[] getValves()
```
    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.
  - removeValve
```
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.
    Implementation note: Implementations are expected to trigger the Container.REMOVE_VALVE_EVENT for the associated container if this call is successful.
    
    Parameters:
    valve - Valve to be removed
  - getFirst
```
Valve getFirst()
```
    Returns:
    the Valve instance that has been distinguished as the basic Valve for this Pipeline (if any).
  - isAsyncSupported
```
boolean isAsyncSupported()
```
    Returns true if all the valves in this pipeline support async, false otherwise
    
    Returns:
    true if all the valves in this pipeline support async, false otherwise
  - getContainer
```
Container getContainer()
```
    Returns:
    the Container with which this Pipeline is associated.
  - setContainer
```
void setContainer(Container container)
```
    Set the Container with which this Pipeline is associated.
    
    Parameters:
    container - The new associated container

Interface Pipeline

Method Summary

Method Detail

getBasic

setBasic

addValve

getValves

removeValve

getFirst

isAsyncSupported

getContainer

setContainer