org.apache.avalon.excalibur.lang
Class DefaultThreadContextPolicy

java.lang.Object
  |
  +--org.apache.avalon.excalibur.lang.DefaultThreadContextPolicy

All Implemented Interfaces:

ThreadContextPolicy

public class DefaultThreadContextPolicy

extends java.lang.Object

implements ThreadContextPolicy

Default ThreadContextPolicy that just maintains the ContextClassLoader ThreadLocal variable. This is a useful class to extend for those wanting to write their own Policy.

Author:

Peter Donald

Fields inherited from interface org.apache.avalon.excalibur.lang.ThreadContextPolicy

CLASSLOADER

Constructor Summary

DefaultThreadContextPolicy()

Method Summary

void	activate(ThreadContextAccessor accessor) The activate method is called when the ThreadContext is associated with a thread.
void	deactivate(ThreadContextAccessor accessor) The deactivate method is called when the ThreadContext is dis-associated with a thread.
protected java.lang.Object	get(ThreadContextAccessor accessor, java.lang.String key, java.lang.Object defaultValue, java.lang.Class type) Get a value for specified key, using specified default if none present and making sure value is of specified type.
void	verifyKeyValue(java.lang.String key, java.lang.Object value) Verify that the key/value pair is valid.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultThreadContextPolicy

public DefaultThreadContextPolicy()

Method Detail

activate

public void activate(ThreadContextAccessor accessor)

The activate method is called when the ThreadContext is associated with a thread. This method sets the ContextClassLoader if CLASSLOADER key is present in context.

Specified by:

activate in interface ThreadContextPolicy

Parameters:

accessor - the accessor to retrieve values from ThreadContext

deactivate

public void deactivate(ThreadContextAccessor accessor)

The deactivate method is called when the ThreadContext is dis-associated with a thread.

Specified by:

deactivate in interface ThreadContextPolicy

Parameters:

accessor - the accessor to retrieve values from ThreadContext

verifyKeyValue

public void verifyKeyValue(java.lang.String key,
                           java.lang.Object value)
                    throws java.lang.IllegalArgumentException

Verify that the key/value pair is valid.

Specified by:

verifyKeyValue in interface ThreadContextPolicy

Parameters:

key - The key

value - the value

Throws:

java.lang.IllegalArgumentException - if pair is not valid

get

protected java.lang.Object get(ThreadContextAccessor accessor,
                               java.lang.String key,
                               java.lang.Object defaultValue,
                               java.lang.Class type)

Get a value for specified key, using specified default if none present and making sure value is of specified type.

Parameters:

key - the key used to lookup value

defaultValue - the default value if the key does not specify value

type - the expected type of value

Returns:

the value