org.springframework.boot.task.TaskSchedulerBuilder Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.boot.task;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.boot.context.properties.PropertyMapper;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* Builder that can be used to configure and create a {@link TaskScheduler}. Provides
* convenience methods to set common {@link ThreadPoolTaskScheduler} settings. For
* advanced configuration, consider using {@link TaskSchedulerCustomizer}.
*
* In a typical auto-configured Spring Boot application this builder is available as a
* bean and can be injected whenever a {@link TaskScheduler} is needed.
*
* @author Stephane Nicoll
* @since 2.1.0
*/
public class TaskSchedulerBuilder {
private final Integer poolSize;
private final String threadNamePrefix;
private final Set customizers;
public TaskSchedulerBuilder() {
this.poolSize = null;
this.threadNamePrefix = null;
this.customizers = null;
}
public TaskSchedulerBuilder(Integer poolSize, String threadNamePrefix,
Set taskSchedulerCustomizers) {
this.poolSize = poolSize;
this.threadNamePrefix = threadNamePrefix;
this.customizers = taskSchedulerCustomizers;
}
/**
* Set the maximum allowed number of threads.
* @param poolSize the pool size to set
* @return a new builder instance
*/
public TaskSchedulerBuilder poolSize(int poolSize) {
return new TaskSchedulerBuilder(poolSize, this.threadNamePrefix, this.customizers);
}
/**
* Set the prefix to use for the names of newly created threads.
* @param threadNamePrefix the thread name prefix to set
* @return a new builder instance
*/
public TaskSchedulerBuilder threadNamePrefix(String threadNamePrefix) {
return new TaskSchedulerBuilder(this.poolSize, threadNamePrefix, this.customizers);
}
/**
* Set the {@link TaskSchedulerCustomizer TaskSchedulerCustomizers} that should be
* applied to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the
* order that they were added after builder configuration has been applied. Setting
* this value will replace any previously configured customizers.
* @param customizers the customizers to set
* @return a new builder instance
* @see #additionalCustomizers(TaskSchedulerCustomizer...)
*/
public TaskSchedulerBuilder customizers(TaskSchedulerCustomizer... customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return customizers(Arrays.asList(customizers));
}
/**
* Set the {@link TaskSchedulerCustomizer taskSchedulerCustomizers} that should be
* applied to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the
* order that they were added after builder configuration has been applied. Setting
* this value will replace any previously configured customizers.
* @param customizers the customizers to set
* @return a new builder instance
* @see #additionalCustomizers(TaskSchedulerCustomizer...)
*/
public TaskSchedulerBuilder customizers(Iterable customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return new TaskSchedulerBuilder(this.poolSize, this.threadNamePrefix, append(null, customizers));
}
/**
* Add {@link TaskSchedulerCustomizer taskSchedulerCustomizers} that should be applied
* to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the order that
* they were added after builder configuration has been applied.
* @param customizers the customizers to add
* @return a new builder instance
* @see #customizers(TaskSchedulerCustomizer...)
*/
public TaskSchedulerBuilder additionalCustomizers(TaskSchedulerCustomizer... customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return additionalCustomizers(Arrays.asList(customizers));
}
/**
* Add {@link TaskSchedulerCustomizer taskSchedulerCustomizers} that should be applied
* to the {@link ThreadPoolTaskScheduler}. Customizers are applied in the order that
* they were added after builder configuration has been applied.
* @param customizers the customizers to add
* @return a new builder instance
* @see #customizers(TaskSchedulerCustomizer...)
*/
public TaskSchedulerBuilder additionalCustomizers(Iterable customizers) {
Assert.notNull(customizers, "Customizers must not be null");
return new TaskSchedulerBuilder(this.poolSize, this.threadNamePrefix, append(this.customizers, customizers));
}
/**
* Build a new {@link ThreadPoolTaskScheduler} instance and configure it using this
* builder.
* @return a configured {@link ThreadPoolTaskScheduler} instance.
* @see #configure(ThreadPoolTaskScheduler)
*/
public ThreadPoolTaskScheduler build() {
return configure(new ThreadPoolTaskScheduler());
}
/**
* Configure the provided {@link ThreadPoolTaskScheduler} instance using this builder.
* @param the type of task scheduler
* @param taskScheduler the {@link ThreadPoolTaskScheduler} to configure
* @return the task scheduler instance
* @see #build()
*/
public T configure(T taskScheduler) {
PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
map.from(this.poolSize).to(taskScheduler::setPoolSize);
map.from(this.threadNamePrefix).to(taskScheduler::setThreadNamePrefix);
if (!CollectionUtils.isEmpty(this.customizers)) {
this.customizers.forEach((customizer) -> customizer.customize(taskScheduler));
}
return taskScheduler;
}
private Set append(Set set, Iterable additions) {
Set result = new LinkedHashSet<>((set != null) ? set : Collections.emptySet());
additions.forEach(result::add);
return Collections.unmodifiableSet(result);
}
}