com.fr.third.jgroups.util

类 TimeScheduler2

java.lang.Object

com.fr.third.jgroups.util.TimeScheduler2

所有已实现的接口:

TimeScheduler, java.lang.Runnable

public class TimeScheduler2
extends java.lang.Object
implements TimeScheduler, java.lang.Runnable

Implementation of TimeScheduler. Uses a thread pool and a single thread which waits for the next task to be executed. When ready, it passes the task to the associated pool to get executed. When multiple tasks are scheduled to get executed at the same time, they're collected in a queue associated with the task execution time, and are executed together.

作者:

Bela Ban

嵌套类概要

嵌套类

限定符和类型	类和说明
protected static class	TimeScheduler2.MyTask Simple task wrapper, always executed by at most 1 thread.

从接口继承的嵌套类/接口 com.fr.third.jgroups.util.TimeScheduler

TimeScheduler.Task

字段概要

字段

限定符和类型	字段和说明
protected static Log	log
protected java.util.concurrent.atomic.AtomicBoolean	no_tasks Needed to signal going from 0 tasks to non-zero (we cannot use tasks.isEmpty() here ...)
protected boolean	running
protected static long	SLEEP_TIME
protected ThreadFactory	timer_thread_factory

构造器概要

构造器

构造器和说明
TimeScheduler2() Create a scheduler that executes tasks in dynamically adjustable intervals
TimeScheduler2(int corePoolSize)
TimeScheduler2(ThreadFactory factory, int min_threads, int max_threads, long keep_alive_time, int max_queue_size, java.lang.String rejection_policy)

方法概要

方法

限定符和类型	方法和说明
protected void	_run()
java.lang.String	dumpTimerTasks() Returns a list of tasks currently waiting for execution.
void	execute(java.lang.Runnable task) Executes command with zero required delay.
int	getCurrentThreads() Returns the current threads in the pool, or -1 if not applicable
long	getKeepAliveTime() Returns the keep alive time (in ms) of the thread pool, or -1 if not applicable
int	getMaxThreads() Returns the configured max threads, or -1 if not applicable
int	getMinThreads() Returns the configured core threads, or -1 if not applicable
int	getQueueSize()
protected void	init()
boolean	isShutdown() Returns true if stop() has been called, false otherwise
void	run()
java.util.concurrent.Future<?>	schedule(java.lang.Runnable work, long delay, java.util.concurrent.TimeUnit unit) Creates and executes a one-shot action that becomes enabled after the given delay.
java.util.concurrent.Future<?>	scheduleAtFixedRate(java.lang.Runnable task, long initial_delay, long delay, java.util.concurrent.TimeUnit unit) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on.
java.util.concurrent.Future<?>	scheduleWithDynamicInterval(TimeScheduler.Task task) Schedule a task for execution at varying intervals.
java.util.concurrent.Future<?>	scheduleWithFixedDelay(java.lang.Runnable task, long initial_delay, long delay, java.util.concurrent.TimeUnit unit) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next.
void	setKeepAliveTime(long time) Sets the keep alive time (in ms) of the thread pool.
void	setMaxThreads(int size) Sets the max pool size.
void	setMinThreads(int size) Sets the core pool size.
void	setThreadFactory(ThreadFactory f)
int	size() Returns the number of tasks currently in the timer
protected void	startRunner()
void	stop() Stops the timer, cancelling all tasks
protected void	stopRunner()
protected void	taskReady(long trigger_time) Signals that a task with a lower execution time than next_execution_time is ready
java.lang.String	toString()
protected void	waitFor()
protected void	waitUntilNextExecution() Sleeps until the next task in line is ready to be executed

从类继承的方法 java.lang.Object

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

字段详细资料

no_tasks

protected final java.util.concurrent.atomic.AtomicBoolean no_tasks

Needed to signal going from 0 tasks to non-zero (we cannot use tasks.isEmpty() here ...)

running

protected volatile boolean running

log

protected static final Log log

timer_thread_factory

protected ThreadFactory timer_thread_factory

SLEEP_TIME

protected static final long SLEEP_TIME

另请参阅:

常量字段值

构造器详细资料

TimeScheduler2

public TimeScheduler2()

Create a scheduler that executes tasks in dynamically adjustable intervals

TimeScheduler2

public TimeScheduler2(ThreadFactory factory,
              int min_threads,
              int max_threads,
              long keep_alive_time,
              int max_queue_size,
              java.lang.String rejection_policy)

TimeScheduler2

public TimeScheduler2(int corePoolSize)

方法详细资料

setThreadFactory

public void setThreadFactory(ThreadFactory f)

指定者:

setThreadFactory 在接口中 TimeScheduler

getMinThreads

public int getMinThreads()

从接口复制的说明: TimeScheduler

Returns the configured core threads, or -1 if not applicable

指定者:

getMinThreads 在接口中 TimeScheduler

返回:

setMinThreads

public void setMinThreads(int size)

从接口复制的说明: TimeScheduler

Sets the core pool size. Can be ignored if not applicable

指定者:

setMinThreads 在接口中 TimeScheduler

getMaxThreads

public int getMaxThreads()

从接口复制的说明: TimeScheduler

Returns the configured max threads, or -1 if not applicable

指定者:

getMaxThreads 在接口中 TimeScheduler

返回:

setMaxThreads

public void setMaxThreads(int size)

从接口复制的说明: TimeScheduler

Sets the max pool size. Can be ignored if not applicable

指定者:

setMaxThreads 在接口中 TimeScheduler

getKeepAliveTime

public long getKeepAliveTime()

从接口复制的说明: TimeScheduler

Returns the keep alive time (in ms) of the thread pool, or -1 if not applicable

指定者:

getKeepAliveTime 在接口中 TimeScheduler

setKeepAliveTime

public void setKeepAliveTime(long time)

从接口复制的说明: TimeScheduler

Sets the keep alive time (in ms) of the thread pool. Can be ignored if not applicable

指定者:

setKeepAliveTime 在接口中 TimeScheduler

getCurrentThreads

public int getCurrentThreads()

从接口复制的说明: TimeScheduler

Returns the current threads in the pool, or -1 if not applicable

指定者:

getCurrentThreads 在接口中 TimeScheduler

返回:

getQueueSize

public int getQueueSize()

dumpTimerTasks

public java.lang.String dumpTimerTasks()

从接口复制的说明: TimeScheduler

Returns a list of tasks currently waiting for execution. If there are a lot of tasks, the returned string should probably only return the number of tasks rather than a full dump.

指定者:

dumpTimerTasks 在接口中 TimeScheduler

返回:

execute

public void execute(java.lang.Runnable task)

从接口复制的说明: TimeScheduler

Executes command with zero required delay. This has effect equivalent to schedule(command, 0, anyUnit).

指定者:

execute 在接口中 TimeScheduler

参数:

task - the task to execute

schedule

public java.util.concurrent.Future<?> schedule(java.lang.Runnable work,
                                      long delay,
                                      java.util.concurrent.TimeUnit unit)

从接口复制的说明: TimeScheduler

Creates and executes a one-shot action that becomes enabled after the given delay.

指定者:

schedule 在接口中 TimeScheduler

参数:

work - the task to execute

delay - the time from now to delay execution

unit - the time unit of the delay parameter

返回:

a ScheduledFuture representing pending completion of the task and whose get() method will return null upon completion

scheduleWithFixedDelay

public java.util.concurrent.Future<?> scheduleWithFixedDelay(java.lang.Runnable task,
                                                    long initial_delay,
                                                    long delay,
                                                    java.util.concurrent.TimeUnit unit)

从接口复制的说明: TimeScheduler

Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next. If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor.

指定者:

scheduleWithFixedDelay 在接口中 TimeScheduler

参数:

task - the task to execute

initial_delay - the time to delay first execution

delay - the delay between the termination of one execution and the commencement of the next

unit - the time unit of the initialDelay and delay parameters

返回:

a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon cancellation

scheduleAtFixedRate

public java.util.concurrent.Future<?> scheduleAtFixedRate(java.lang.Runnable task,
                                                 long initial_delay,
                                                 long delay,
                                                 java.util.concurrent.TimeUnit unit)

从接口复制的说明: TimeScheduler

Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on. If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor. If any execution of this task takes longer than its period, then subsequent executions may start late, but will not concurrently execute.

指定者:

scheduleAtFixedRate 在接口中 TimeScheduler

参数:

task - the task to execute

initial_delay - the time to delay first execution

delay - the period between successive executions

unit - the time unit of the initialDelay and period parameters

返回:

a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon cancellation

scheduleWithDynamicInterval

public java.util.concurrent.Future<?> scheduleWithDynamicInterval(TimeScheduler.Task task)

Schedule a task for execution at varying intervals. After execution, the task will get rescheduled after TimeScheduler2.Task#nextInterval() milliseconds. The task is neve done until nextInterval() return a value <= 0 or the task is cancelled.

指定者:

scheduleWithDynamicInterval 在接口中 TimeScheduler

参数:

task - the task to execute Task is rescheduled relative to the last time it actually started execution

false:
Task is scheduled relative to its last execution schedule. This has the effect that the time between two consecutive executions of the task remains the same.

Note that relative is always true; we always schedule the next execution relative to the last *actual*

size

public int size()

Returns the number of tasks currently in the timer

指定者:

size 在接口中 TimeScheduler

返回:

The number of tasks currently in the timer

toString

public java.lang.String toString()

覆盖:

toString 在类中 java.lang.Object

stop

public void stop()

Stops the timer, cancelling all tasks

指定者:

stop 在接口中 TimeScheduler

抛出:

java.lang.InterruptedException - if interrupted while waiting for thread to return

isShutdown

public boolean isShutdown()

从接口复制的说明: TimeScheduler

Returns true if stop() has been called, false otherwise

指定者:

isShutdown 在接口中 TimeScheduler

run

public void run()

指定者:

run 在接口中 java.lang.Runnable

_run

protected void _run()

init

protected void init()

waitUntilNextExecution

protected void waitUntilNextExecution()

Sleeps until the next task in line is ready to be executed

waitFor

protected void waitFor()

taskReady

protected void taskReady(long trigger_time)

Signals that a task with a lower execution time than next_execution_time is ready

startRunner

protected void startRunner()

stopRunner

protected void stopRunner()