JanosVM v0.6.0 Java API Documentation: Class ExportManager

edu.utah.janosvm.sys
Class ExportManager

java.lang.Object
  |
  +--edu.utah.janosvm.sys.ExportManager

public final class ExportManager

extends java.lang.Object

Tracks the importables associated with a single exportable. Each ExportManager is associated with exactly one Exportable. An exportable may have multiple ExportManagers (if it is exported under mutliple names, for example).

An ExportManager tracks the links between an exported object and its imports. This is required so that we can revoke any references when a team dies or the export is no longer available to other teams.

Author:

Tim Stack, Utah Janos Team

See Also:

Importable, Exportable

Inner Class Summary

class

ExportManager.ImportEnumerator The ImportEnumerator is used to traverse the list of importers of an export.

Method Summary

void	addImporter(Importable im) Add an Importable to the list of objects importing our export.
ExportManager.ImportEnumerator	getEnumerator()
ExportManager.ImportEnumerator	imports() Similar to the above except that it constructs a new ImportEnumerator and adds that to the list.
boolean	imports(ExportManager.ImportEnumerator ie) Setup the given ImportEnumerator to traverse the importers list.
void	setExport(Exportable ex) If this manager is empty you can fill in its export with this function.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

setExport

public void setExport(Exportable ex)

If this manager is empty you can fill in its export with this function.

Parameters:

ex - The exported object to be managed.

Throws:

Throws - a NullPointerException if ex is null.

addImporter

public void addImporter(Importable im)

Add an Importable to the list of objects importing our export.

Parameters:

im - The Importable that wants a reference to our export.

getEnumerator

public ExportManager.ImportEnumerator getEnumerator()

Returns:

An ImportEnumerator for this ExportManager.

imports

public boolean imports(ExportManager.ImportEnumerator ie)

Setup the given ImportEnumerator to traverse the importers list.

Parameters:

ie - The ImportEnumerator that will be inserted into the importers list.

Returns:

True if this manager is still valid and its importers can be traversed, false otherwise.

imports

public ExportManager.ImportEnumerator imports()

Similar to the above except that it constructs a new ImportEnumerator and adds that to the list.

Returns:

A new ImportEnumerator ready to traverse the list or NULL if this manager is invalid.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object