org.apache.ambari.server.stack.upgrade

Class Task

java.lang.Object

org.apache.ambari.server.stack.upgrade.Task

Direct Known Subclasses:

ConfigureFunction, ExecuteTask, RegenerateKeytabsTask, RestartTask, ServerSideActionTask, ServiceCheckTask, StartTask, StopTask

public abstract class Task
extends Object

Base class to identify the items that could possibly occur during an upgrade

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Task.Type Identifies the type of task.

Field Summary

Fields

Modifier and Type	Field and Description
Condition	condition A condition element with can prevent this task from being scheduled in the upgrade.
protected static com.google.gson.Gson	GSON A Gson instance to use when doing simple serialization along with Expose.
boolean	isSequential Whether the task needs to run sequentially, i.e., on its own stage.
UpgradeScope	scope The scope for the task
String	summary An optional brief description of what this task is doing.
String	timeoutConfig The config property to check for timeout.

Constructor Summary

Constructors

Constructor and Description
Task()

Method Summary

Modifier and Type	Method and Description
abstract String	getActionVerb()
abstract StageWrapper.Type	getStageWrapperType()
String	getSummary() Gets the summary of the task or null.
abstract Task.Type	getType()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

GSON

protected static final com.google.gson.Gson GSON

A Gson instance to use when doing simple serialization along with Expose.

summary

public String summary

An optional brief description of what this task is doing.

isSequential

public boolean isSequential

Whether the task needs to run sequentially, i.e., on its own stage. If false, will be grouped with other tasks.

timeoutConfig

public String timeoutConfig

The config property to check for timeout.

condition

public Condition condition

A condition element with can prevent this task from being scheduled in the upgrade.

scope

public UpgradeScope scope

The scope for the task

Constructor Detail

Task

public Task()

Method Detail

getType

public abstract Task.Type getType()

Returns:

the type of the task

getStageWrapperType

public abstract StageWrapper.Type getStageWrapperType()

Returns:

when a single Task is constructed, this is the type of stage it should belong to.

getActionVerb

public abstract String getActionVerb()

Returns:

a verb to display that describes the type of task, e.g., "executing".

toString

public String toString()

Overrides:

toString in class Object

getSummary

public String getSummary()

Gets the summary of the task or null.

Returns:

the task summary or null.