org.hawkular.metrics.tasks.impl

Class Task2Impl

java.lang.Object

org.hawkular.metrics.tasks.impl.Task2Impl

All Implemented Interfaces:

Task2

public class Task2Impl
extends Object
implements Task2

Author:

jsanda

Constructor Summary

Constructors

Constructor and Description
Task2Impl(UUID id, String groupKey, int order, String name, Map<String,String> parameters, Trigger trigger)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getGroupKey() The group key provides a way to logically and physically group tasks.
UUID	getId() This is essentially a primary key that uniquely identifies a task.
String	getName() Identifies the type of task.
int	getOrder() Defines the order of execution of tasks within a group.
Map<String,String>	getParameters() An optional, arbitrary set of key/value parameters that the task receives upon execution.
Trigger	getTrigger() Defines the execution policy of the task, like when the task is scheduled to execute, how many times it should execute, etc.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Task2Impl

public Task2Impl(UUID id,
                 String groupKey,
                 int order,
                 String name,
                 Map<String,String> parameters,
                 Trigger trigger)

Method Detail

getId

public UUID getId()

Description copied from interface: Task2

This is essentially a primary key that uniquely identifies a task.

Specified by:

getId in interface Task2

getGroupKey

public String getGroupKey()

Description copied from interface: Task2

The group key provides a way to logically and physically group tasks. In conjunction with the priority it can be used to control the order of execution of tasks which is desirable when there are interdependencies between tasks. For example, suppose we have a task, T1, that aggregates data from multiple time series to produce a new time series. Then we have a task, T2, that aggregates the data from the time series produced by T2. T2 in effect depends on T1. They should use the same group key.

For Hawkular the group key will generally be the tenant ID. It is a good choice because tenants and all of their data are isolated from one another.

In terms of implementation, all tasks with the same group key will be stored in the same queue shard, which means that they will all be stored within the same physical partition. This should be taken into consideration when choosing a group key because you do not want to wind up with queue shards/partitions that are excessively large.

Specified by:

getGroupKey in interface Task2

getOrder

public int getOrder()

Description copied from interface: Task2

Defines the order of execution of tasks within a group. Lower values are executed first. Note that this ordering only applies to tasks within the same group, which is defined by the group key.

Specified by:

getOrder in interface Task2

getName

public String getName()

Description copied from interface: Task2

Identifies the type of task. Multiple tasks can have the same name.

Specified by:

getName in interface Task2

getParameters

public Map<String,String> getParameters()

Description copied from interface: Task2

An optional, arbitrary set of key/value parameters that the task receives upon execution.

Specified by:

getParameters in interface Task2

getTrigger

public Trigger getTrigger()

Description copied from interface: Task2

Defines the execution policy of the task, like when the task is scheduled to execute, how many times it should execute, etc.

Specified by:

getTrigger in interface Task2

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object