de.fhg.igd.atlas.core
Class StorageDBEvent

java.lang.Object
  de.fhg.igd.event.Event
      de.fhg.igd.atlas.core.StorageDBEvent

All Implemented Interfaces:

Implication, Serializable

public final class StorageDBEvent

extends Event

This class represents a database event. Database events are triggered when the state of the corresponding database has changed. Each event carries a StorageDBImmutableEntry representing the entry within the database which has been added, changed or deleted as well as the identifier of the action which led to the new state.

Version:

"$Id: StorageDBEvent.java 1913 2007-08-08 02:41:53Z jpeters $"

Author:

Jan Peters

See Also:

Serialized Form

Field Summary

static int	ALL
private StorageDBImmutableEntry	dbEntry_ The imutable database entry corresponding to the StorageDBEntry managed by the database, which triggered this event.
static int	DELETE
static int	INIT
private int	mask_ The bit mask of those parameters this event refers to.
private static String[]	op_id The tokens which specify event parameters.
private static int[]	op_mask Each event parameter corresponds to a bit mask which is used for quick implication testing.
static int	REFRESH
static int	TIMEOUT
static int	UPDATE

Fields inherited from class de.fhg.igd.event.Event

millis

Constructor Summary

StorageDBEvent(StorageDBImmutableEntry dbEntry, String action)
Creates an instance.

Method Summary

boolean	equals(Object o) Tests if this object is equal to the given one which is true iff their classes match, their masks match and their agent names match.
StorageDBImmutableEntry	getDBEntry() Returns the entry of the database which is subject of this event.
int	getMask() Returns the mask of this object.
boolean	implies(Object o) Checks whether this object implies the given one.
boolean	isDelete() Return true if this event's DELETE flag is set.
boolean	isInit() Return true if this event's INIT flag is set.
boolean	isRefresh() Return true if this event's REFRESH flag is set.
boolean	isTimeout() Return true if this event's TIMEOUT flag is set.
boolean	isUpdate() Return true if this event's UPDATE flag is set.
String	toString() Returns a string representation of this object.

Methods inherited from class java.lang.Object

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

Field Detail

INIT

public static final int INIT

See Also:

Constant Field Values

UPDATE

public static final int UPDATE

See Also:

Constant Field Values

DELETE

public static final int DELETE

See Also:

Constant Field Values

REFRESH

public static final int REFRESH

See Also:

Constant Field Values

TIMEOUT

public static final int TIMEOUT

See Also:

Constant Field Values

ALL

public static final int ALL

See Also:

Constant Field Values

op_id

private static final String[] op_id

The tokens which specify event parameters.

op_mask

private static final int[] op_mask

Each event parameter corresponds to a bit mask which is used for quick implication testing.

dbEntry_

private transient StorageDBImmutableEntry dbEntry_

The imutable database entry corresponding to the StorageDBEntry managed by the database, which triggered this event.

mask_

private int mask_

The bit mask of those parameters this event refers to.

Constructor Detail

StorageDBEvent

public StorageDBEvent(StorageDBImmutableEntry dbEntry,
                      String action)

Creates an instance. dbEntry represents the entry of the database which is subject of this event. action is a comma seperated list of strings representing the actions which led to the new state of the database (see op_id).

Parameters:

dbEntry - The entry which has been added, changed or deleted and thereby led to a new state of the database.

action - The event's actions.

Method Detail

implies

public boolean implies(Object o)

Checks whether this object implies the given one. This is exactly the case if:

• both objects are of the same class,
• the mask of the given instance is non-zero,
• all mask bits in the given instance are also set in this one,

  Parameters:

  o - The object which is tested for implication.

  Returns:

  true if this event implies the given one.

equals

public boolean equals(Object o)

Tests if this object is equal to the given one which is true iff their classes match, their masks match and their agent names match.

Parameters:

o - The object which is tested for equality.

getMask

public int getMask()

Returns the mask of this object.

Returns:

The mask.

getDBEntry

public StorageDBImmutableEntry getDBEntry()

Returns the entry of the database which is subject of this event.

Returns:

The database entry.

toString

public String toString()

Returns a string representation of this object.

Returns:

The String representation.

isInit

public boolean isInit()

Return true if this event's INIT flag is set.

Returns:

true if this event signals INIT.

isUpdate

public boolean isUpdate()

Return true if this event's UPDATE flag is set.

Returns:

true if this event signals UPDATE.

isDelete

public boolean isDelete()

Return true if this event's DELETE flag is set.

Returns:

true if this event signals DELETE.

isRefresh

public boolean isRefresh()

Return true if this event's REFRESH flag is set.

Returns:

true if this event signals REFRESH.

isTimeout

public boolean isTimeout()

Return true if this event's TIMEOUT flag is set.

Returns:

true if this event signals TIMEOUT.