Task (swim-concurrent 4.0.0 API)

All Superinterfaces:

TaskFunction

All Known Implementing Classes:

AbstractTask
```
public interface Task
extends TaskFunction
```
Stateful TaskFunction to invoke as a sequential process on a concurrent execution Stage, with lifecycle callbacks, and a TaskContext for self-management. Use Stage.task(TaskFunction) to bind a new Task to a Stage, and invoke TaskRef.cue() to schedule the concurrent execution of the sequential task.
Blocking
Task implementations should not perform long running or blocking operations, if possible. If a Task does need to block, it should return true from taskWillBlock() to avoid thread starvation of the execution Stage.

See Also:

AbstractTask, Stage

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`runTask()`	Executes this sequential process.
`void`	`setTaskContext(TaskContext taskContext)`	Sets the context used to managed this `Task`.
`TaskContext`	`taskContext()`	Returns the context used to managed this `Task`.
`void`	`taskDidCancel()`	Lifecycle callback invoked after this `Task` is explicitly cancelled.
`boolean`	`taskWillBlock()`	Returns `true` if this `Task` might block its thread of execution when running; returns `false` if this `Task` will never block.
`void`	`taskWillCue()`	Lifecycle callback invoked before this `Task` is scheduled for execution.

- Method Detail
  - taskContext
```
TaskContext taskContext()
```
    Returns the context used to managed this Task. Returns null if this Task is not bound to a Stage.
  - setTaskContext
```
void setTaskContext(TaskContext taskContext)
```
    Sets the context used to managed this Task. A TaskContext is assigned when binding this Task to a Stage.
  - runTask
```
void runTask()
```
    Executes this sequential process. Only one thread at a time will execute runTask for this Task.
    
    Specified by:
    
    runTask in interface TaskFunction
  - taskWillBlock
```
boolean taskWillBlock()
```
    Returns true if this Task might block its thread of execution when running; returns false if this Task will never block. Used by the execution Stage to prevent thread starvation when concurrently running many blocking tasks.
  - taskWillCue
```
void taskWillCue()
```
    Lifecycle callback invoked before this Task is scheduled for execution.
  - taskDidCancel
```
void taskDidCancel()
```
    Lifecycle callback invoked after this Task is explicitly cancelled.