org.directwebremoting.impl
Class DefaultContainer

java.lang.Object
  org.directwebremoting.impl.AbstractContainer
      org.directwebremoting.impl.DefaultContainer

All Implemented Interfaces:

Container

Direct Known Subclasses:

SpringContainer

public class DefaultContainer
extends AbstractContainer
implements Container

DefaultContainer is like a mini-IoC container for DWR. At least it is an IoC container by interface (check: no params that have anything to do with DWR), but it is hard coded specifically for DWR. If we want to make more of it we can later, but this is certainly not going to become a full blown IoC container.

Author:

Joe Walker [joe at getahead dot ltd dot uk]

Constructor Summary

DefaultContainer()

Method Summary

void	addParameter(java.lang.String askFor, java.lang.Object valueParam) Set the class that should be used to implement the given interface
java.lang.Object	getBean(java.lang.String id) Get an instance of a bean of a given name (usually name=class name).
java.util.Collection<java.lang.String>	getBeanNames() Get a list of all the available beans.
java.lang.String	getParameter(java.lang.String name) Retrieve a previously set parameter
void	setupFinished() Called to indicate that we finished adding parameters.

Methods inherited from class org.directwebremoting.impl.AbstractContainer

getBean

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.directwebremoting.Container

getBean

Constructor Detail

DefaultContainer

public DefaultContainer()

Method Detail

addParameter

public void addParameter(java.lang.String askFor,
                         java.lang.Object valueParam)
                  throws ContainerConfigurationException

Set the class that should be used to implement the given interface

Parameters:

askFor - The interface to implement

valueParam - The new implementation

Throws:

ContainerConfigurationException - If the specified beans could not be used

getParameter

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

Retrieve a previously set parameter

Parameters:

name - The parameter name to retrieve

Returns:

The value of the specified parameter, or null if one is not set

setupFinished

public void setupFinished()

Called to indicate that we finished adding parameters. The thread safety of a large part of DWR depends on this function only being called from Servlet.init(javax.servlet.ServletConfig), where all the setup is done, and where we depend on the undocumented feature of all servlet containers that they complete the init process of a Servlet before they begin servicing requests.

See Also:

addParameter(String, Object)

getBean

public java.lang.Object getBean(java.lang.String id)

Description copied from interface: Container

Get an instance of a bean of a given name (usually name=class name).

Specified by:

getBean in interface Container

Parameters:

id - The type to get an instance of

Returns:

The object of the given type, or null if the object does not exist

getBeanNames

public java.util.Collection<java.lang.String> getBeanNames()

Description copied from interface: Container

Get a list of all the available beans. Implementation of this method is optional so it is valid for this method to return an empty collection, but to return Objects when queried directly using Container.getBean(String). This method should only be used for debugging purposes.

Specified by:

getBeanNames in interface Container

Returns:

A collection containing all the availble bean names.