Module ch.qos.logback.core

Package ch.qos.logback.core.util

Class FixedIntervalInvocationGate

java.lang.Object

ch.qos.logback.core.util.FixedIntervalInvocationGate

All Implemented Interfaces:

InvocationGate

Direct Known Subclasses:

SimpleInvocationGate

public class FixedIntervalInvocationGate
extends Object
implements InvocationGate

A time-based InvocationGate with fixed-interval logic.

Callers on a hot path use isTooSoon(long) to decide whether to skip a costly operation. At most one thread per increment interval is allowed to proceed (i.e. receives false); other threads in the same window receive true and should skip the work.

Compared to DefaultInvocationGate, this implementation does not adapt a sampling mask. It only advances an atomic next-allowed timestamp by a fixed Duration.

Typical use is size checks in rolling policies where file length is expensive relative to the logging call.

Since:

1.3.6/1.4.6 (formerly SimpleInvocationGate)

Author:

Ceki Gülcü

See Also:

• InvocationGate
• DefaultInvocationGate
• BatchedFixedIntervalInvocationGate
• SizeBasedTriggeringPolicy

Field Summary

Fields

Modifier and Type	Field	Description
static final Duration	DEFAULT_INCREMENT	Default increment: 60 seconds.

Fields inherited from interface ch.qos.logback.core.util.InvocationGate

TIME_UNAVAILABLE

Constructor Summary

Constructors

Constructor	Description
FixedIntervalInvocationGate()	Creates a gate with DEFAULT_INCREMENT.
FixedIntervalInvocationGate(Duration anIncrement)	Creates a gate that allows at most one successful passage per anIncrement period.

Method Summary

Modifier and Type	Method	Description
boolean	isTooSoon(long currentTime)	Returns true if the caller should skip further work; false if this call is allowed to proceed.

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_INCREMENT

public static final Duration DEFAULT_INCREMENT

Default increment: 60 seconds.

Constructor Details

FixedIntervalInvocationGate

public FixedIntervalInvocationGate()

Creates a gate with DEFAULT_INCREMENT.

FixedIntervalInvocationGate

public FixedIntervalInvocationGate(Duration anIncrement)

Creates a gate that allows at most one successful passage per anIncrement period.

Parameters:

anIncrement - duration between allowed invocations; must not be null

Method Details

isTooSoon

public boolean isTooSoon(long currentTime)

Returns true if the caller should skip further work; false if this call is allowed to proceed.

If currentTime is InvocationGate.TIME_UNAVAILABLE (-1), this method returns false so the caller can still perform the work when the clock is unavailable.

Otherwise, when currentTime is strictly before the next allowed time, the method returns true (too soon). When currentTime has reached the next allowed time, this thread tries to advance that time by increment. On success it returns false (proceed); if another thread already advanced it, this thread returns true so that only one passage per interval is granted.

Specified by:

isTooSoon in interface InvocationGate

Parameters:

currentTime - current time in milliseconds, or InvocationGate.TIME_UNAVAILABLE if unknown

Returns:

true if further work should be skipped; false if the caller may proceed