Package io.debezium.connector.spanner.task.scaler

Class TaskScalerMonitorImpl

java.lang.Object

io.debezium.connector.spanner.task.scaler.TaskScalerMonitorImpl

All Implemented Interfaces:

TaskScalerMonitor

public class TaskScalerMonitorImpl
extends Object
implements TaskScalerMonitor

This class returns the initial task count upon startup. On each "UPDATE_EPOCH" Sync Event message received, it checks whether or not we need to scale up / down the number of tasks.

Field Summary

Fields

Modifier and Type	Field	Description
private final CountDownLatch	initialLatch
private final int	minTasks
private final AtomicInteger	requiredTasksCount
private final TaskScaler	taskScaler
private final TaskSyncEventListener	taskSyncEventListener

Constructor Summary

Constructors

Constructor	Description
TaskScalerMonitorImpl(TaskSyncEventListener taskSyncEventListener, TaskScaler taskScaler, int minTasks)

Method Summary

Modifier and Type	Method	Description
int	getRequiredTasksCount()
void	shutdown()
int	start()

Methods inherited from class java.lang.Object

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

Field Details

taskSyncEventListener

private final TaskSyncEventListener taskSyncEventListener

taskScaler

private final TaskScaler taskScaler

initialLatch

private final CountDownLatch initialLatch

requiredTasksCount

private final AtomicInteger requiredTasksCount

minTasks

private final int minTasks

Constructor Details

TaskScalerMonitorImpl

public TaskScalerMonitorImpl(TaskSyncEventListener taskSyncEventListener,
 TaskScaler taskScaler,
 int minTasks)

Method Details

start

public int start()
          throws InterruptedException

Specified by:

start in interface TaskScalerMonitor

Throws:

InterruptedException

getRequiredTasksCount

public int getRequiredTasksCount()

Specified by:

getRequiredTasksCount in interface TaskScalerMonitor

shutdown

public void shutdown()

Specified by:

shutdown in interface TaskScalerMonitor