com.persistit

Class AlertMonitor.History

java.lang.Object

com.persistit.AlertMonitor.History

Enclosing class:

AlertMonitor

public class AlertMonitor.History
extends Object

Aggregation of AlertMonitor.Events in a category. The history retains the first event, the most recent N events where N is determined by the AlertMonitor.getHistoryLength() attribute, the count of events and other fields used to determine how frequently new notifications are issued.

Constructor Summary

Constructors

Constructor and Description
History()

Method Summary

Modifier and Type	Method and Description
int	getCount()
String	getDetailedHistory()
long	getDuration()
List<AlertMonitor.Event>	getEventList()
AlertMonitor.Event	getFirstEvent()
long	getFirstEventTime()
AlertMonitor.Event	getLastEvent()
long	getLastEventTime()
AlertMonitor.AlertLevel	getLevel()
void	poll(long now, boolean force) Issue a log messages and notifications as needed to signify an ongoing condition.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

History

public History()

Method Detail

toString

public String toString()

Overrides:

toString in class Object

Returns:

a formated report showing the most recent AlertMonitor.Event

getDetailedHistory

public String getDetailedHistory()

Returns:

a formated report showing all of the retained AlertMonitor.Events

getLevel

public AlertMonitor.AlertLevel getLevel()

Returns:

the current alert level of this monitor

getFirstEventTime

public long getFirstEventTime()

Returns:

time of the first event

getLastEventTime

public long getLastEventTime()

Returns:

time of the last event

getDuration

public long getDuration()

Returns:

interval between first and last recorded event, in seconds

getEventList

public List<AlertMonitor.Event> getEventList()

Returns:

the recent history

getFirstEvent

public AlertMonitor.Event getFirstEvent()

Returns:

The first event added to this history, or null if there have been no events.

getLastEvent

public AlertMonitor.Event getLastEvent()

Returns:

The last event added to this history, or null if there have been no events.

getCount

public int getCount()

Returns:

the count of events posted to this history

poll

public void poll(long now,
                 boolean force)

Issue a log messages and notifications as needed to signify an ongoing condition. This method is called periodically. It keeps track of when the last message was added to the log and writes a new recurring message only as frequently as allowed by AlertMonitor.getErrorLogTimeInterval() or AlertMonitor.getWarnLogTimeInterval().

Parameters:

now - current system time as returned by System.currentTimeMillis()

force - if true and the level is WARN or ERROR, this method emits a notification regardless of whether the notification interval has elapsed; otherwise this method does nothing unless the interval has elapsed.