spring ScheduledTaskRegistrar 源码
spring ScheduledTaskRegistrar 代码
文件路径：/spring-context/src/main/java/org/springframework/scheduling/config/ScheduledTaskRegistrar.java
/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.scheduling.config;
import java.time.Duration;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.concurrent.ConcurrentTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* Helper bean for registering tasks with a {@link TaskScheduler}, typically using cron
* expressions.
*
* <p>As of Spring 3.1, {@code ScheduledTaskRegistrar} has a more prominent user-facing
* role when used in conjunction with the {@link
* org.springframework.scheduling.annotation.EnableAsync @EnableAsync} annotation and its
* {@link org.springframework.scheduling.annotation.SchedulingConfigurer
* SchedulingConfigurer} callback interface.
*
* @author Juergen Hoeller
* @author Chris Beams
* @author Tobias Montagna-Hay
* @author Sam Brannen
* @author Arjen Poutsma
* @since 3.0
* @see org.springframework.scheduling.annotation.EnableAsync
* @see org.springframework.scheduling.annotation.SchedulingConfigurer
*/
public class ScheduledTaskRegistrar implements ScheduledTaskHolder, InitializingBean, DisposableBean {
/**
* A special cron expression value that indicates a disabled trigger: {@value}.
* <p>This is primarily meant for use with {@link #addCronTask(Runnable, String)}
* when the value for the supplied {@code expression} is retrieved from an
* external source — for example, from a property in the
* {@link org.springframework.core.env.Environment Environment}.
* @since 5.2
* @see org.springframework.scheduling.annotation.Scheduled#CRON_DISABLED
*/
public static final String CRON_DISABLED = "-";
@Nullable
private TaskScheduler taskScheduler;
@Nullable
private ScheduledExecutorService localExecutor;
@Nullable
private List<TriggerTask> triggerTasks;
@Nullable
private List<CronTask> cronTasks;
@Nullable
private List<IntervalTask> fixedRateTasks;
@Nullable
private List<IntervalTask> fixedDelayTasks;
private final Map<Task, ScheduledTask> unresolvedTasks = new HashMap<>(16);
private final Set<ScheduledTask> scheduledTasks = new LinkedHashSet<>(16);
/**
* Set the {@link TaskScheduler} to register scheduled tasks with.
*/
public void setTaskScheduler(TaskScheduler taskScheduler) {
Assert.notNull(taskScheduler, "TaskScheduler must not be null");
this.taskScheduler = taskScheduler;
}
/**
* Set the {@link TaskScheduler} to register scheduled tasks with, or a
* {@link java.util.concurrent.ScheduledExecutorService} to be wrapped as a
* {@code TaskScheduler}.
*/
public void setScheduler(@Nullable Object scheduler) {
if (scheduler == null) {
this.taskScheduler = null;
}
else if (scheduler instanceof TaskScheduler) {
this.taskScheduler = (TaskScheduler) scheduler;
}
else if (scheduler instanceof ScheduledExecutorService) {
this.taskScheduler = new ConcurrentTaskScheduler(((ScheduledExecutorService) scheduler));
}
else {
throw new IllegalArgumentException("Unsupported scheduler type: " + scheduler.getClass());
}
}
/**
* Return the {@link TaskScheduler} instance for this registrar (may be {@code null}).
*/
@Nullable
public TaskScheduler getScheduler() {
return this.taskScheduler;
}
/**
* Specify triggered tasks as a Map of Runnables (the tasks) and Trigger objects
* (typically custom implementations of the {@link Trigger} interface).
*/
public void setTriggerTasks(Map<Runnable, Trigger> triggerTasks) {
this.triggerTasks = new ArrayList<>();
triggerTasks.forEach((task, trigger) -> addTriggerTask(new TriggerTask(task, trigger)));
}
/**
* Specify triggered tasks as a list of {@link TriggerTask} objects. Primarily used
* by {@code <task:*>} namespace parsing.
* @since 3.2
* @see ScheduledTasksBeanDefinitionParser
*/
public void setTriggerTasksList(List<TriggerTask> triggerTasks) {
this.triggerTasks = triggerTasks;
}
/**
* Get the trigger tasks as an unmodifiable list of {@link TriggerTask} objects.
* @return the list of tasks (never {@code null})
* @since 4.2
*/
public List<TriggerTask> getTriggerTaskList() {
return (this.triggerTasks != null? Collections.unmodifiableList(this.triggerTasks) :
Collections.emptyList());
}
/**
* Specify triggered tasks as a Map of Runnables (the tasks) and cron expressions.
* @see CronTrigger
*/
public void setCronTasks(Map<Runnable, String> cronTasks) {
this.cronTasks = new ArrayList<>();
cronTasks.forEach(this::addCronTask);
}
/**
* Specify triggered tasks as a list of {@link CronTask} objects. Primarily used by
* {@code <task:*>} namespace parsing.
* @since 3.2
* @see ScheduledTasksBeanDefinitionParser
*/
public void setCronTasksList(List<CronTask> cronTasks) {
this.cronTasks = cronTasks;
}
/**
* Get the cron tasks as an unmodifiable list of {@link CronTask} objects.
* @return the list of tasks (never {@code null})
* @since 4.2
*/
public List<CronTask> getCronTaskList() {
return (this.cronTasks != null ? Collections.unmodifiableList(this.cronTasks) :
Collections.emptyList());
}
/**
* Specify triggered tasks as a Map of Runnables (the tasks) and fixed-rate values.
* @see TaskScheduler#scheduleAtFixedRate(Runnable, Duration)
*/
public void setFixedRateTasks(Map<Runnable, Long> fixedRateTasks) {
this.fixedRateTasks = new ArrayList<>();
fixedRateTasks.forEach((task, interval) -> addFixedRateTask(task, Duration.ofMillis(interval)));
}
/**
* Specify fixed-rate tasks as a list of {@link IntervalTask} objects. Primarily used
* by {@code <task:*>} namespace parsing.
* @since 3.2
* @see ScheduledTasksBeanDefinitionParser
*/
public void setFixedRateTasksList(List<IntervalTask> fixedRateTasks) {
this.fixedRateTasks = fixedRateTasks;
}
/**
* Get the fixed-rate tasks as an unmodifiable list of {@link IntervalTask} objects.
* @return the list of tasks (never {@code null})
* @since 4.2
*/
public List<IntervalTask> getFixedRateTaskList() {
return (this.fixedRateTasks != null ? Collections.unmodifiableList(this.fixedRateTasks) :
Collections.emptyList());
}
/**
* Specify triggered tasks as a Map of Runnables (the tasks) and fixed-delay values.
* @see TaskScheduler#scheduleWithFixedDelay(Runnable, Duration)
*/
public void setFixedDelayTasks(Map<Runnable, Long> fixedDelayTasks) {
this.fixedDelayTasks = new ArrayList<>();
fixedDelayTasks.forEach((task, delay) -> addFixedDelayTask(task, Duration.ofMillis(delay)));
}
/**
* Specify fixed-delay tasks as a list of {@link IntervalTask} objects. Primarily used
* by {@code <task:*>} namespace parsing.
* @since 3.2
* @see ScheduledTasksBeanDefinitionParser
*/
public void setFixedDelayTasksList(List<IntervalTask> fixedDelayTasks) {
this.fixedDelayTasks = fixedDelayTasks;
}
/**
* Get the fixed-delay tasks as an unmodifiable list of {@link IntervalTask} objects.
* @return the list of tasks (never {@code null})
* @since 4.2
*/
public List<IntervalTask> getFixedDelayTaskList() {
return (this.fixedDelayTasks != null ? Collections.unmodifiableList(this.fixedDelayTasks) :
Collections.emptyList());
}
/**
* Add a Runnable task to be triggered per the given {@link Trigger}.
* @see TaskScheduler#scheduleAtFixedRate(Runnable, Duration)
*/
public void addTriggerTask(Runnable task, Trigger trigger) {
addTriggerTask(new TriggerTask(task, trigger));
}
/**
* Add a {@code TriggerTask}.
* @since 3.2
* @see TaskScheduler#scheduleAtFixedRate(Runnable, Duration)
*/
public void addTriggerTask(TriggerTask task) {
if (this.triggerTasks == null) {
this.triggerTasks = new ArrayList<>();
}
this.triggerTasks.add(task);
}
/**
* Add a {@link Runnable} task to be triggered per the given cron {@code expression}.
* <p>As of Spring Framework 5.2, this method will not register the task if the
* {@code expression} is equal to {@link #CRON_DISABLED}.
*/
public void addCronTask(Runnable task, String expression) {
if (!CRON_DISABLED.equals(expression)) {
addCronTask(new CronTask(task, expression));
}
}
/**
* Add a {@link CronTask}.
* @since 3.2
*/
public void addCronTask(CronTask task) {
if (this.cronTasks == null) {
this.cronTasks = new ArrayList<>();
}
this.cronTasks.add(task);
}
/**
* Add a {@code Runnable} task to be triggered at the given fixed-rate interval.
* @deprecated as of 6.0, in favor of {@link #addFixedRateTask(Runnable, Duration)}
*/
@Deprecated
public void addFixedRateTask(Runnable task, long interval) {
addFixedRateTask(new IntervalTask(task, Duration.ofMillis(interval)));
}
/**
* Add a {@code Runnable} task to be triggered at the given fixed-rate interval.
* @since 6.0
* @see TaskScheduler#scheduleAtFixedRate(Runnable, Duration)
*/
public void addFixedRateTask(Runnable task, Duration interval) {
addFixedRateTask(new IntervalTask(task, interval));
}
/**
* Add a fixed-rate {@link IntervalTask}.
* @since 3.2
* @see TaskScheduler#scheduleAtFixedRate(Runnable, Duration)
*/
public void addFixedRateTask(IntervalTask task) {
if (this.fixedRateTasks == null) {
this.fixedRateTasks = new ArrayList<>();
}
this.fixedRateTasks.add(task);
}
/**
* Add a Runnable task to be triggered with the given fixed delay.
* @deprecated as of 6.0, in favor of {@link #addFixedDelayTask(Runnable, Duration)}
*/
@Deprecated
public void addFixedDelayTask(Runnable task, long delay) {
addFixedDelayTask(new IntervalTask(task, Duration.ofMillis(delay)));
}
/**
* Add a Runnable task to be triggered with the given fixed delay.
* @since 6.0
* @see TaskScheduler#scheduleWithFixedDelay(Runnable, Duration)
*/
public void addFixedDelayTask(Runnable task, Duration delay) {
addFixedDelayTask(new IntervalTask(task, delay));
}
/**
* Add a fixed-delay {@link IntervalTask}.
* @since 3.2
* @see TaskScheduler#scheduleWithFixedDelay(Runnable, Duration)
*/
public void addFixedDelayTask(IntervalTask task) {
if (this.fixedDelayTasks == null) {
this.fixedDelayTasks = new ArrayList<>();
}
this.fixedDelayTasks.add(task);
}
/**
* Return whether this {@code ScheduledTaskRegistrar} has any tasks registered.
* @since 3.2
*/
public boolean hasTasks() {
return (!CollectionUtils.isEmpty(this.triggerTasks) ||
!CollectionUtils.isEmpty(this.cronTasks) ||
!CollectionUtils.isEmpty(this.fixedRateTasks) ||
!CollectionUtils.isEmpty(this.fixedDelayTasks));
}
/**
* Calls {@link #scheduleTasks()} at bean construction time.
*/
@Override
public void afterPropertiesSet() {
scheduleTasks();
}
/**
* Schedule all registered tasks against the underlying
* {@linkplain #setTaskScheduler(TaskScheduler) task scheduler}.
*/
protected void scheduleTasks() {
if (this.taskScheduler == null) {
this.localExecutor = Executors.newSingleThreadScheduledExecutor();
this.taskScheduler = new ConcurrentTaskScheduler(this.localExecutor);
}
if (this.triggerTasks != null) {
for (TriggerTask task : this.triggerTasks) {
addScheduledTask(scheduleTriggerTask(task));
}
}
if (this.cronTasks != null) {
for (CronTask task : this.cronTasks) {
addScheduledTask(scheduleCronTask(task));
}
}
if (this.fixedRateTasks != null) {
for (IntervalTask task : this.fixedRateTasks) {
if (task instanceof FixedRateTask fixedRateTask) {
addScheduledTask(scheduleFixedRateTask(fixedRateTask));
}
else {
addScheduledTask(scheduleFixedRateTask(new FixedRateTask(task)));
}
}
}
if (this.fixedDelayTasks != null) {
for (IntervalTask task : this.fixedDelayTasks) {
if (task instanceof FixedDelayTask fixedDelayTask) {
addScheduledTask(scheduleFixedDelayTask(fixedDelayTask));
}
else {
addScheduledTask(scheduleFixedDelayTask(new FixedDelayTask(task)));
}
}
}
}
private void addScheduledTask(@Nullable ScheduledTask task) {
if (task != null) {
this.scheduledTasks.add(task);
}
}
/**
* Schedule the specified trigger task, either right away if possible
* or on initialization of the scheduler.
* @return a handle to the scheduled task, allowing to cancel it
* @since 4.3
*/
@Nullable
public ScheduledTask scheduleTriggerTask(TriggerTask task) {
ScheduledTask scheduledTask = this.unresolvedTasks.remove(task);
boolean newTask = false;
if (scheduledTask == null) {
scheduledTask = new ScheduledTask(task);
newTask = true;
}
if (this.taskScheduler != null) {
scheduledTask.future = this.taskScheduler.schedule(task.getRunnable(), task.getTrigger());
}
else {
addTriggerTask(task);
this.unresolvedTasks.put(task, scheduledTask);
}
return (newTask ? scheduledTask : null);
}
/**
* Schedule the specified cron task, either right away if possible
* or on initialization of the scheduler.
* @return a handle to the scheduled task, allowing to cancel it
* (or {@code null} if processing a previously registered task)
* @since 4.3
*/
@Nullable
public ScheduledTask scheduleCronTask(CronTask task) {
ScheduledTask scheduledTask = this.unresolvedTasks.remove(task);
boolean newTask = false;
if (scheduledTask == null) {
scheduledTask = new ScheduledTask(task);
newTask = true;
}
if (this.taskScheduler != null) {
scheduledTask.future = this.taskScheduler.schedule(task.getRunnable(), task.getTrigger());
}
else {
addCronTask(task);
this.unresolvedTasks.put(task, scheduledTask);
}
return (newTask ? scheduledTask : null);
}
/**
* Schedule the specified fixed-rate task, either right away if possible
* or on initialization of the scheduler.
* @return a handle to the scheduled task, allowing to cancel it
* (or {@code null} if processing a previously registered task)
* @since 5.0.2
*/
@Nullable
public ScheduledTask scheduleFixedRateTask(FixedRateTask task) {
ScheduledTask scheduledTask = this.unresolvedTasks.remove(task);
boolean newTask = false;
if (scheduledTask == null) {
scheduledTask = new ScheduledTask(task);
newTask = true;
}
if (this.taskScheduler != null) {
Duration initialDelay = task.getInitialDelayDuration();
if (initialDelay.toMillis() > 0) {
Instant startTime = this.taskScheduler.getClock().instant().plus(initialDelay);
scheduledTask.future =
this.taskScheduler.scheduleAtFixedRate(task.getRunnable(), startTime, task.getIntervalDuration());
}
else {
scheduledTask.future =
this.taskScheduler.scheduleAtFixedRate(task.getRunnable(), task.getIntervalDuration());
}
}
else {
addFixedRateTask(task);
this.unresolvedTasks.put(task, scheduledTask);
}
return (newTask ? scheduledTask : null);
}
/**
* Schedule the specified fixed-delay task, either right away if possible
* or on initialization of the scheduler.
* @return a handle to the scheduled task, allowing to cancel it
* (or {@code null} if processing a previously registered task)
* @since 5.0.2
*/
@Nullable
public ScheduledTask scheduleFixedDelayTask(FixedDelayTask task) {
ScheduledTask scheduledTask = this.unresolvedTasks.remove(task);
boolean newTask = false;
if (scheduledTask == null) {
scheduledTask = new ScheduledTask(task);
newTask = true;
}
if (this.taskScheduler != null) {
Duration initialDelay = task.getInitialDelayDuration();
if (!initialDelay.isNegative()) {
Instant startTime = this.taskScheduler.getClock().instant().plus(task.getInitialDelayDuration());
scheduledTask.future =
this.taskScheduler.scheduleWithFixedDelay(task.getRunnable(), startTime, task.getIntervalDuration());
}
else {
scheduledTask.future =
this.taskScheduler.scheduleWithFixedDelay(task.getRunnable(), task.getIntervalDuration());
}
}
else {
addFixedDelayTask(task);
this.unresolvedTasks.put(task, scheduledTask);
}
return (newTask ? scheduledTask : null);
}
/**
* Return all locally registered tasks that have been scheduled by this registrar.
* @since 5.0.2
* @see #addTriggerTask
* @see #addCronTask
* @see #addFixedRateTask
* @see #addFixedDelayTask
*/
@Override
public Set<ScheduledTask> getScheduledTasks() {
return Collections.unmodifiableSet(this.scheduledTasks);
}
@Override
public void destroy() {
for (ScheduledTask task : this.scheduledTasks) {
task.cancel();
}
if (this.localExecutor != null) {
this.localExecutor.shutdownNow();
}
}
}
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