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Loader.java API Doc Apache Tomcat 6.0.14 5357 Fri Jul 20 04:20:36 BST 2007 org.apache.catalina

Loader

public interface Loader

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: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $

Fields Summary
Constructors Summary
Methods Summary
public void addPropertyChangeListener(java.beans.PropertyChangeListener listener)
Add a property change listener to this component.
param
listener The listener to add
public void addRepository(java.lang.String repository)
Add a new repository to the set of repositories for this class loader.
param
repository Repository to be added
public void backgroundProcess()
Execute a periodic task, such as reloading, etc. This method will be invoked inside the classloading context of this container. Unexpected throwables will be caught and logged.
public java.lang.String[] findRepositories()
Return the set of repositories defined for this class loader. If none are defined, a zero-length array is returned.
public java.lang.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 boolean getDelegate()
Return the "follow standard delegation model" flag used to configure our ClassLoader.
public java.lang.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()
Has the internal repository associated with this Loader been modified, such that the loaded classes should be reloaded?
public void removePropertyChangeListener(java.beans.PropertyChangeListener listener)
Remove a property change listener from this component.
param
listener The listener to remove
public void setContainer(Container container)
Set the Container with which this Loader has been associated.
param
container The associated Container
public void setDelegate(boolean delegate)
Set the "follow standard delegation model" flag used to configure our ClassLoader.
param
delegate The new flag
public void setReloadable(boolean reloadable)
Set the reloadable flag for this Loader.
param
reloadable The new reloadable flag