com.jdon.util.task

类 TaskEngine

java.lang.Object

com.jdon.util.task.TaskEngine

public class TaskEngine
extends Object

A TaskEngine object accepts Runnable objects and queues them for execution by worker threads.

Note: the current implementation of this class ignores priority. This may be changed in the future, however. this is s simple task/job engine, more power see Quartz or JMS usage:

 TaskEngine taskEngine = new TaskEngine();
 MyTask myTask = new MyTask();
 engine.addTask(myTask, Thread.NORM_PRIORITY);
 

MyTask must implements Runnable of Thread.

方法概要

限定符和类型	方法和说明
static void	addTask(Runnable r) Adds a task to the task queue with normal priority.
static void	addTask(Runnable task, int priority) Adds a task to the task queue.
static TimerTask	scheduleTask(Runnable task, int priority, long delay, long period) Schedules a task to periodically run.
static TimerTask	scheduleTask(Runnable task, long delay, long period) Schedules a task to periodically run.

从类继承的方法 java.lang.Object

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

方法详细资料

addTask

public static void addTask(Runnable r)

Adds a task to the task queue with normal priority. The task will be executed immediately provided there is a free worker thread to execute it. Otherwise, it will execute as soon as a worker thread becomes available.

addTask

public static void addTask(Runnable task,
                           int priority)

Adds a task to the task queue. The task will be executed immediately provided there is a free worker thread to execute it. Otherwise, it will execute as soon as a worker thread becomes available.

The priority of the task can be specified and must be one of the following values:

• Thread.MAX_PRIORITY
• Thread.NORM_PRIORITY
• Thread.MIN_PRIORITY

参数:

task - the task to execute

scheduleTask

public static TimerTask scheduleTask(Runnable task,
                                     long delay,
                                     long period)

Schedules a task to periodically run. This is useful for tasks such as updating search indexes, deleting old data at periodic intervals, etc.

参数:

task - task to be scheduled.

delay - delay in milliseconds before task is to be executed.

period - time in milliseconds between successive task executions.

返回:

a TimerTask object which can be used to track executions of the task and to cancel subsequent executions.

scheduleTask

public static TimerTask scheduleTask(Runnable task,
                                     int priority,
                                     long delay,
                                     long period)

Schedules a task to periodically run. This is useful for tasks such as updating search indexes, deleting old data at periodic intervals, etc.

参数:

task - task to be scheduled.

priority - the priority the periodic task should run at.

delay - delay in milliseconds before task is to be executed.

period - time in milliseconds between successive task executions.

返回:

a TimerTask object which can be used to track executions of the task and to cancel subsequent executions.