com.sun.mail.util.logging

Class DurationFilter

java.lang.Object

com.sun.mail.util.logging.DurationFilter

All Implemented Interfaces:

Filter

public class DurationFilter
extends Object
implements Filter

A filter used to limit log records based on a maximum generation rate. The duration specified is used to compute the record rate and the amount of time the filter will reject records once the rate has been exceeded. Once the rate is exceeded records are not allowed until the duration has elapsed.

By default each DurationFilter is initialized using the following LogManager configuration properties where <filter-name> refers to the fully qualified class name of the handler. If properties are not defined, or contain invalid values, then the specified default values are used.

• <filter-name>.records the max number of records per duration. A numeric long integer or a multiplication expression can be used as the value. (defaults to 1000)
• <filter-name>.duration the number of milliseconds to suppress log records from being published. This is also used as duration to determine the log record rate. A numeric long integer or a multiplication expression can be used as the value. If the java.time package is available then an ISO-8601 duration format of PnDTnHnMn.nS can be used as the value. The suffixes of "D", "H", "M" and "S" are for days, hours, minutes and seconds. The suffixes must occur in order. The seconds can be specified with a fractional component to declare milliseconds. (defaults to PT15M)

For example, the settings to limit MailHandler with a default capacity to only send a maximum of two email messages every six minutes would be as follows:

 
  com.sun.mail.util.logging.MailHandler.filter = com.sun.mail.util.logging.DurationFilter
  com.sun.mail.util.logging.MailHandler.capacity = 1000
  com.sun.mail.util.logging.DurationFilter.records = 2L * 1000L
  com.sun.mail.util.logging.DurationFilter.duration = PT6M
 
 

Since:

JavaMail 1.5.5

Author:

Jason Mehrens

Constructor Summary

Constructors

Constructor and Description
DurationFilter() Creates the filter using the default properties.
DurationFilter(long records, long duration) Creates the filter using the given properties.

Method Summary

Modifier and Type	Method and Description
protected DurationFilter	clone() Creates a copy of this filter that retains the filter settings but does not include the current filter state.
boolean	equals(Object obj) Determines if this filter is equal to another filter.
int	hashCode() Returns a hash code value for this filter.
boolean	isIdle() Determines if this filter is able to accept the maximum number of log records for this instant in time.
boolean	isLoggable() Determines if this filter will accept log records for this instant in time.
boolean	isLoggable(LogRecord record) Check if the given log record should be published.
String	toString() Returns a string representation of this filter.

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DurationFilter

public DurationFilter()

Creates the filter using the default properties.

DurationFilter

public DurationFilter(long records,
                      long duration)

Creates the filter using the given properties. Default values are used if any of the given values are outside the allowed range.

Parameters:

records - the number of records per duration.

duration - the number of milliseconds to suppress log records from being published.

Method Detail

equals

public boolean equals(Object obj)

Determines if this filter is equal to another filter.

Overrides:

equals in class Object

Parameters:

obj - the given object.

Returns:

true if equal otherwise false.

isIdle

public boolean isIdle()

Determines if this filter is able to accept the maximum number of log records for this instant in time. The result is a best-effort estimate and should be considered out of date as soon as it is produced. This method is designed for use in monitoring the state of this filter.

Returns:

true if the filter is idle; false otherwise.

hashCode

public int hashCode()

Returns a hash code value for this filter.

Overrides:

hashCode in class Object

Returns:

hash code for this filter.

isLoggable

public boolean isLoggable(LogRecord record)

Check if the given log record should be published. This method will modify the internal state of this filter.

Specified by:

isLoggable in interface Filter

Parameters:

record - the log record to check.

Returns:

true if allowed; false otherwise.

Throws:

NullPointerException - if given record is null.

isLoggable

public boolean isLoggable()

Determines if this filter will accept log records for this instant in time. The result is a best-effort estimate and should be considered out of date as soon as it is produced. This method is designed for use in monitoring the state of this filter.

Returns:

true if the filter is not saturated; false otherwise.

toString

public String toString()

Returns a string representation of this filter. The result is a best-effort estimate and should be considered out of date as soon as it is produced.

Overrides:

toString in class Object

Returns:

a string representation of this filter.

clone

protected DurationFilter clone()
                        throws CloneNotSupportedException

Creates a copy of this filter that retains the filter settings but does not include the current filter state. The newly create clone acts as if it has never seen any records.

Overrides:

clone in class Object

Returns:

a copy of this filter.

Throws:

CloneNotSupportedException - if this filter is not allowed to be cloned.