public interface MultiSelectable
MultiSelectable
interface identifies the implementing
Applet subclass as being capable of concurrent selections. A multiselectable
applet is a subclass of javacard.framework.Applet
which
directly or indirectly implements this interface. All of the applets within
an applet package must be multiselectable. If they are not, then none of the
applets can be multiselectable.
An instance of a multiselectable applet can be selected on one logical channel while the same applet instance or another applet instance from within the same package is active on another logical channel.
The methods of this interface are invoked by the Java Card runtime environment only when:
See Runtime Environment Specification, Java Card Platform, Classic Edition for details.
Modifier and Type | Method and Description |
---|---|
void |
deselect(boolean appInstStillActive)
Called by the Java Card runtime environment to inform that this currently
selected applet instance is being deselected on this logical channel
while the same applet instance or another applet instance from the same
package is still active on another logical channel.
|
boolean |
select(boolean appInstAlreadyActive)
Called by the Java Card runtime environment to inform that this applet
instance has been selected while the same applet instance or another
applet instance from the same package is active on another logical
channel.
|
boolean select(boolean appInstAlreadyActive)
It is called either when the MANAGE CHANNEL APDU (open) command or the SELECT APDU command is received and before the applet instance is selected. SELECT APDU commands use instance AID bytes for applet selection. See Runtime Environment Specification, Java Card Platform, Classic Edition, section 4.5 for details.
A subclass of Applet
should, within this method, perform
any initialization that may be required to process APDU commands that may
follow. This method returns a boolean to indicate that it is ready to
accept incoming APDU commands via its process()
method. If
this method returns false, it indicates to the Java Card runtime
environment that this applet instance declines to be selected.
Note:
javacard.framework.Applet.select(
) method is not
called if this method is invoked.appInstAlreadyActive
- boolean flag is true
when the same applet
instance is already active on another logical channel and
false
otherwisetrue
if the applet instance accepts selection,
false
otherwisevoid deselect(boolean appInstStillActive)
select()
method.
A subclass of Applet
should, within this method, perform
any cleanup or bookkeeping work before another applet instance is
selected or the logical channel is closed.
Notes:
javacard.framework.Applet.deselect(
) method is
not called if this method is invoked.JCSystem.CLEAR_ON_DESELECT
clear event type owned
by this applet instance since at least one applet instance from the same
package is still active.appInstStillActive
- boolean flag is true
when the same applet
instance is still active on another logical channel and
false
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