WorkerTask

java.lang.Object
- com.iizix.WorkerTask<TASK_ID,PARAM,RESULT>

Type Parameters:

TASK_ID - The ID parameter type for the task.

PARAM - The parameter type for the task.

RESULT - The result type for the task.

All Implemented Interfaces:

Comparable<Object>
```
public abstract class WorkerTask<TASK_ID,PARAM,RESULT>
extends Object
implements Comparable<Object>
```
The WorkerTask is something that requires processing in the Worker queue or some IO operations, etc.

Author:

Christopher Mindus

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class WorkerTask.State
Task states.

Nested Classes
Modifier and Type	Class and Description
`static class`	`WorkerTask.State` Task states.

Field Summary

Fields
Modifier and Type	Field and Description
`long`	`createTime` The time when the task was created.
`static int`	`PRIORITY_DEFAULT` The priority level of the task: default (5).
`static int`	`PRIORITY_HIGHEST` The priority level of the task: highest (10).
`static int`	`PRIORITY_LOWEST` The priority level of the task: lowest (0).

Constructor Summary

Constructors
Constructor and Description
`WorkerTask()` Constructor for the task to perform, no task ID, no parameter, no callback, default priority.
`WorkerTask(PARAM param)` Constructor for the task to perform, no task ID, no callback, default priority.
`WorkerTask(TASK_ID id, PARAM param)` Constructor for the task to perform, no callback, default priority.
`WorkerTask(TASK_ID id, PARAM param, WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback)` Constructor for the task to perform, default priority.
`WorkerTask(TASK_ID id, PARAM param, WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback, int priority)` Constructor for the task to perform.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`cancel(boolean interruptTaskThread)` Cancels the task.
`int`	`compareTo(Object wt)` Compares the priority level of the specified task with this one.
`void`	`execute()` Starts execution of the task.
`abstract RESULT`	`execute(TASK_ID id, PARAM param)` Start execution of the task with the implementation specific task ID and parameter.
`long`	`getEndTime()` Gets the time in milliseconds (System.currentTimeMillis) when the task ended.
`Throwable`	`getException()` Gets the exception thrown by the task if it completed with an exception.
`TASK_ID`	`getID()` Gets the ID parameter.
`int`	`getModalID()` Gets the modal ID when the modality extends beyond this process, e.g.
`PARAM`	`getParam()` Gets the `PARAM` parameter.
`RESULT`	`getResult()` Gets the result of the task if it has completed successfully.
`long`	`getStartTime()` Gets the time in milliseconds (System.currentTimeMillis) when the task was started.
`WorkerTask.State`	`getState()` Checks the current task state.
`WorkerNIO`	`getWorker()` Gets the worker associated with this task.
`boolean`	`isCancelled()` Checks if the task is cancelled.
`void`	`setCallback(WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback)` Sets the callback function that is called upon end of the task, called regardless if a result is set for normal completion, or an exception.
`void`	`waitForTaskEnded()` Waits for task to end.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PRIORITY_LOWEST
```
public static final int PRIORITY_LOWEST
```
    The priority level of the task: lowest (0).
    
    See Also:
    
    Constant Field Values
  - PRIORITY_DEFAULT
```
public static final int PRIORITY_DEFAULT
```
    The priority level of the task: default (5).
    
    See Also:
    
    Constant Field Values
  - PRIORITY_HIGHEST
```
public static final int PRIORITY_HIGHEST
```
    The priority level of the task: highest (10).
    
    See Also:
    
    Constant Field Values
  - createTime
```
public final long createTime
```
    The time when the task was created.
- Constructor Detail
  - WorkerTask
```
public WorkerTask()
```
    Constructor for the task to perform, no task ID, no parameter, no callback, default priority.
  - WorkerTask
```
public WorkerTask(PARAM param)
```
    Constructor for the task to perform, no task ID, no callback, default priority.
    
    Parameters:
    
    param - The implementation specific parameter, or null for none.
  - WorkerTask
```
public WorkerTask(TASK_ID id,
                  PARAM param)
```
    Constructor for the task to perform, no callback, default priority.
    
    Parameters:
    
    id - The implementation specific task ID.
    
    param - The implementation specific parameter, or null for none.
  - WorkerTask
```
public WorkerTask(TASK_ID id,
                  PARAM param,
                  WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback)
```
    Constructor for the task to perform, default priority.
    
    Parameters:
    
    id - The implementation specific task ID.
    
    param - The implementation specific parameter, or null for none.
    
    callback - The callback function to call when task ends or is cancelled, null for none.
  - WorkerTask
```
public WorkerTask(TASK_ID id,
                  PARAM param,
                  WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback,
                  int priority)
```
    Constructor for the task to perform.
    
    Parameters:
    
    id - The implementation specific task ID.
    
    param - The implementation specific parameter, or null for none.
    
    callback - The callback function to call when task ends or is cancelled, null for none.
    
    priority - The priority of the task.
- Method Detail
  - setCallback
```
public final void setCallback(WorkerTaskEnded<TASK_ID,PARAM,RESULT> callback)
```
    Sets the callback function that is called upon end of the task, called regardless if a result is set for normal completion, or an exception.
    
    Parameters:
    
    callback - The callback function to call when task ends or is cancelled, null for none.
  - execute
```
public final void execute()
```
    Starts execution of the task. This method is called by the invoker of the task, i.e. the Worker.
  - execute
```
public abstract RESULT execute(TASK_ID id,
                               PARAM param)
                        throws Exception
```
    Start execution of the task with the implementation specific task ID and parameter.
    
    Parameters:
    
    id - The implementation specific task ID.
    
    param - The implementation specific parameter, or null for none.
    
    Returns:
    
    The return code.
    
    Throws:
    
    Exception - If some error occurs during processing of the task.
  - getModalID
```
public final int getModalID()
```
    Gets the modal ID when the modality extends beyond this process, e.g. from Server to Client, where Client will reply later to Server.
    
    Returns:
    
    The modal ID, zero indicates no modality for the task.
  - getState
```
public final WorkerTask.State getState()
```
    Checks the current task state.
    
    Returns:
    
    NOT_STARTED, RUNNING, COMPLETED, EXCEPTION.
  - getID
```
public final TASK_ID getID()
```
    Gets the ID parameter.
  - getParam
```
public final PARAM getParam()
```
    Gets the PARAM parameter.
  - getResult
```
public final RESULT getResult()
```
    Gets the result of the task if it has completed successfully.
    
    Returns:
    
    The return result from the task, or null if the task has not yet or didn't complete normally.
  - getException
```
public final Throwable getException()
```
    Gets the exception thrown by the task if it completed with an exception.
    
    Returns:
    
    The exception thrown by the task, or null if it completed normally or has not yet completed.
  - isCancelled
```
public final boolean isCancelled()
```
    Checks if the task is cancelled.
  - cancel
```
public boolean cancel(boolean interruptTaskThread)
```
    Cancels the task.
    
    Parameters:
    
    interruptTaskThread - Flag indicating if the task thread should be interrupted (if running) with call to thread.interrupt();.
    
    Returns:
    
    true for success, false for failure.
  - waitForTaskEnded
```
public void waitForTaskEnded()
                      throws InterruptedException
```
    Waits for task to end. If the task hasn't been started yet, it will wait for it to end or to be cancelled.
    
    Throws:
    
    InterruptedException - If the current thread is interrupted during the waiting.
  - getStartTime
```
public long getStartTime()
```
    Gets the time in milliseconds (System.currentTimeMillis) when the task was started.
    
    Returns:
    
    zero if the has has not yet been started.
  - getEndTime
```
public long getEndTime()
```
    Gets the time in milliseconds (System.currentTimeMillis) when the task ended.
    
    Returns:
    
    zero if the has has not yet ended.
  - getWorker
```
public final WorkerNIO getWorker()
```
    Gets the worker associated with this task.
    
    Returns:
    
    The worker for the task, null if the task has not yet been added to the worker queue.
  - compareTo
```
public final int compareTo(Object wt)
```
    Compares the priority level of the specified task with this one.
    
    Specified by:
    
    compareTo in interface Comparable<Object>
    
    Parameters:
    
    wt - The worker task to compare priority with.
    
    Returns:
    
    -1, 0 or 1 for the priority level.

Class WorkerTask<TASK_ID,PARAM,RESULT>

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PRIORITY_LOWEST

PRIORITY_DEFAULT

PRIORITY_HIGHEST

createTime

Constructor Detail

WorkerTask

WorkerTask

WorkerTask

WorkerTask

WorkerTask

Method Detail

setCallback

execute

execute

getModalID

getState

getID

getParam

getResult

getException

isCancelled

cancel

waitForTaskEnded

getStartTime

getEndTime

getWorker

compareTo