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Java Source Code / Java Documentation » Sevlet Container » tomcat catalina » org.apache.catalina

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.catalina .Loader

All known Subclasses:   org.apache.catalina.loader .WebappLoader,
Loader
public interface Loader (Code)
A Loader represents a Java ClassLoader implementation that can be used by a Container to load class files (within a repository associated with the Loader) that are designed to be reloaded upon request, as well as a mechanism to detect whether changes have occurred in the underlying repository.
In order for a Loader implementation to successfully operate with a Context implementation that implements reloading, it must obey the following constraints:

Must implement Lifecycle so that the Context can indicate that a new class loader is required.
The start() method must unconditionally create a new ClassLoader implementation.
The stop() method must throw away its reference to the ClassLoader previously utilized, so that the class loader, all classes loaded by it, and all objects of those classes, can be garbage collected.
Must allow a call to stop() to be followed by a call to start() on the same Loader instance.
Based on a policy chosen by the implementation, must call the Context.reload() method on the owning Context when a change to one or more of the class files loaded by this class loader is detected.

author:
   Craig R. McClanahan
version:
   $Revision: 1.3 $ $Date: 2004/02/27 14:58:38 $

Method Summary
public void addPropertyChangeListener(PropertyChangeListener listener)
     Add a property change listener to this component.
public void addRepository(String repository)
     Add a new repository to the set of repositories for this class loader.
public String[] findRepositories()
     Return the set of repositories defined for this class loader.
public ClassLoader getClassLoader()
     Return the Java class loader to be used by this Container.
public Container getContainer()
     Return the Container with which this Loader has been associated.
public DefaultContext getDefaultContext()
     Return the DefaultContext with which this Manager is associated.
public boolean getDelegate()
     Return the "follow standard delegation model" flag used to configure our ClassLoader.
public String getInfo()
     Return descriptive information about this Loader implementation and the corresponding version number, in the format <description>/<version>.
public boolean getReloadable()
     Return the reloadable flag for this Loader.
public boolean modified()

public void removePropertyChangeListener(PropertyChangeListener listener)
     Remove a property change listener from this component.
public void setContainer(Container container)
     Set the Container with which this Loader has been associated.
public void setDefaultContext(DefaultContext defaultContext)
     Set the DefaultContext with which this Manager is associated.
public void setDelegate(boolean delegate)
     Set the "follow standard delegation model" flag used to configure our ClassLoader.
public void setReloadable(boolean reloadable)
     Set the reloadable flag for this Loader.

Method Detail
addPropertyChangeListener
public void addPropertyChangeListener(PropertyChangeListener listener)(Code)
Add a property change listener to this component.
Parameters:
  listener - The listener to add

addRepository
public void addRepository(String repository)(Code)
Add a new repository to the set of repositories for this class loader.
Parameters:
  repository - Repository to be added

findRepositories
public String[] findRepositories()(Code)
Return the set of repositories defined for this class loader. If none are defined, a zero-length array is returned.

getClassLoader
public ClassLoader getClassLoader()(Code)
Return the Java class loader to be used by this Container.

getContainer
public Container getContainer()(Code)
Return the Container with which this Loader has been associated.

getDefaultContext
public DefaultContext getDefaultContext()(Code)
Return the DefaultContext with which this Manager is associated.

getDelegate
public boolean getDelegate()(Code)
Return the "follow standard delegation model" flag used to configure our ClassLoader.

getInfo
public String getInfo()(Code)
Return descriptive information about this Loader implementation and the corresponding version number, in the format <description>/<version>.

getReloadable
public boolean getReloadable()(Code)
Return the reloadable flag for this Loader.

modified
public boolean modified()(Code)
Has the internal repository associated with this Loader been modified, such that the loaded classes should be reloaded?

removePropertyChangeListener
public void removePropertyChangeListener(PropertyChangeListener listener)(Code)
Remove a property change listener from this component.
Parameters:
  listener - The listener to remove

setContainer
public void setContainer(Container container)(Code)
Set the Container with which this Loader has been associated.
Parameters:
  container - The associated Container

setDefaultContext
public void setDefaultContext(DefaultContext defaultContext)(Code)
Set the DefaultContext with which this Manager is associated.
Parameters:
  defaultContext - The newly associated DefaultContext

setDelegate
public void setDelegate(boolean delegate)(Code)
Set the "follow standard delegation model" flag used to configure our ClassLoader.
Parameters:
  delegate - The new flag

setReloadable
public void setReloadable(boolean reloadable)(Code)
Set the reloadable flag for this Loader.
Parameters:
  reloadable - The new reloadable flag

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