ai.grakn.engine.tasks.manager.singlequeue

Class SingleQueueTaskManager

java.lang.Object

ai.grakn.engine.tasks.manager.singlequeue.SingleQueueTaskManager

All Implemented Interfaces:

TaskManager, AutoCloseable

public class SingleQueueTaskManager
extends Object
implements TaskManager

TaskManager implementation that operates using a single Kafka queue and controls the lifecycle SingleQueueTaskManager

Author:

aelred, alexandrorth

Constructor Summary

Constructors

Constructor and Description
SingleQueueTaskManager(EngineID engineId) Create a SingleQueueTaskManager The SingleQueueTaskManager implementation must: + Instantiate a connection to zookeeper + Configure and instance of TaskStateStorage + Create and run an instance of SingleQueueTaskRunner + Add oneself to the leader elector by instantiating failoverelector

Method Summary

Modifier and Type	Method and Description
void	addTask(TaskState taskState) Create an instance of a task based on the given parameters and submit it a Kafka queue.
void	close() Close the SingleQueueTaskRunner and .
org.apache.kafka.clients.consumer.Consumer<TaskId,TaskState>	newConsumer() Get a new kafka consumer listening on the new tasks topic
void	stopTask(TaskId id) Stop a task from running.
TaskStateStorage	storage() Access the storage that this instance of TaskManager uses.

Methods inherited from class java.lang.Object

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

Methods inherited from interface ai.grakn.engine.tasks.TaskManager

chooseStorage

Constructor Detail

SingleQueueTaskManager

public SingleQueueTaskManager(EngineID engineId)
                       throws Exception

Create a SingleQueueTaskManager The SingleQueueTaskManager implementation must: + Instantiate a connection to zookeeper + Configure and instance of TaskStateStorage + Create and run an instance of SingleQueueTaskRunner + Add oneself to the leader elector by instantiating failoverelector

Throws:

Exception

Method Detail

close

public void close()

Close the SingleQueueTaskRunner and . Any errors that occur should not prevent the subsequent ones from executing.

Specified by:

close in interface AutoCloseable

addTask

public void addTask(TaskState taskState)

Create an instance of a task based on the given parameters and submit it a Kafka queue.

Specified by:

addTask in interface TaskManager

Parameters:

taskState - Task to execute

stopTask

public void stopTask(TaskId id)

Stop a task from running.

Specified by:

stopTask in interface TaskManager

Parameters:

id - ID of task to stop.

storage

public TaskStateStorage storage()

Access the storage that this instance of TaskManager uses.

Specified by:

storage in interface TaskManager

Returns:

A TaskStateStorage object

newConsumer

public org.apache.kafka.clients.consumer.Consumer<TaskId,TaskState> newConsumer()

Get a new kafka consumer listening on the new tasks topic