com.lmax.disruptor

Interface SequenceBarrier

public interface SequenceBarrier

Coordination barrier for tracking the cursor for publishers and sequence of dependent EventProcessors for processing a data structure

Method Summary

Modifier and Type	Method and Description
void	alert() Alert the EventProcessors of a status change and stay in this status until cleared.
void	checkAlert() Check if an alert has been raised and throw an AlertException if it has.
void	clearAlert() Clear the current alert status.
long	getCursor() Get the current cursor value that can be read.
boolean	isAlerted() The current alert status for the barrier.
long	waitFor(long sequence) Wait for the given sequence to be available for consumption.

Method Detail

waitFor

long waitFor(long sequence)
      throws AlertException,
             java.lang.InterruptedException,
             TimeoutException

Wait for the given sequence to be available for consumption.

Parameters:

sequence - to wait for

Returns:

the sequence up to which is available

Throws:

AlertException - if a status change has occurred for the Disruptor

java.lang.InterruptedException - if the thread needs awaking on a condition variable.

TimeoutException - if a timeout occurs while waiting for the supplied sequence.

getCursor

long getCursor()

Get the current cursor value that can be read.

Returns:

value of the cursor for entries that have been published.

isAlerted

boolean isAlerted()

The current alert status for the barrier.

Returns:

true if in alert otherwise false.

alert

void alert()

Alert the EventProcessors of a status change and stay in this status until cleared.

clearAlert

void clearAlert()

Clear the current alert status.

checkAlert

void checkAlert()
         throws AlertException

Check if an alert has been raised and throw an AlertException if it has.

Throws:

AlertException - if alert has been raised.