Package 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
    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
    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 Details

    • 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 Details

    • 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.