jdbm

Interface ActionRecordManager

All Superinterfaces:

RecordManager

All Known Implementing Classes:

SnapshotRecordManager

public interface ActionRecordManager
extends RecordManager

Extends the RecordManager to allow callers to group their RecordManager interface calls into actions. Actions operate in isolation. Each thread has a current action context associated with it. Threads can switch between different action context using set/unsetActionContext calls.

Field Summary

Fields inherited from interface jdbm.RecordManager

NAME_DIRECTORY_ROOT

Method Summary

Modifier and Type	Method and Description
void	abortAction(ActionContext context) Aborts the given action.
ActionContext	beginAction(boolean readOnly, java.lang.String whoStarted) Initializes the context for the action.
void	endAction(ActionContext context) Ends the action associated with the context.
void	setCurrentActionContext(ActionContext context) Set the context as the current action context for the given thread
void	unsetCurrentActionContext(ActionContext context) Unsets the context as the current action context.

Methods inherited from interface jdbm.RecordManager

close, commit, delete, fetch, fetch, getNamedObject, getRoot, getRootCount, insert, insert, rollback, setNamedObject, setRoot, update, update

Method Detail

beginAction

ActionContext beginAction(boolean readOnly,
                          java.lang.String whoStarted)

Initializes the context for the action. Implicity sets the context as the current action.

Parameters:

readOnly - true if action does not do any modification

whoStarted - caller can use this for debugging

Returns:

The created action context

endAction

void endAction(ActionContext context)

Ends the action associated with the context. ReadWrite actions' changes are made visible to readers.

Parameters:

context - identifies the action to end

abortAction

void abortAction(ActionContext context)

Aborts the given action. For write actions, actions's changes should not be made visible to readers.

Parameters:

context - identifies the action to abort

setCurrentActionContext

void setCurrentActionContext(ActionContext context)

Set the context as the current action context for the given thread

Parameters:

context - identifies the context

unsetCurrentActionContext

void unsetCurrentActionContext(ActionContext context)

Unsets the context as the current action context. Given context should be current action context for the calling thread.

Parameters:

context - identifies the context.