JAVA中gettaskcount_java 注解实现一个可配置线程池的方法示例

java 注解实现一个可配置线程池的方法示例

发布于 2020-7-17|

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摘记: 前言项目需要多线程执行一些Task，为了方便各个服务的使用。特意封装了一个公共工具类，下面直接撸代码：PoolConfig(线程池核心配置参数):

```java

/**

* 线程池核心配置( ..

前言项目需要多线程执行一些Task，为了方便各个服务的使用。特意封装了一个公共工具类，下面直接撸代码：PoolConfig(线程池核心配置参数):

```java

/**

* 线程池核心配置(基本线程池数量、最大线程池数量、队列初始容量、线程连接保持活动秒数(默认60s))

*

*

*

*

* 属性名称

*

* 属性含义

*

*

* queueCapacity

*

* 基本线程池数量

*

*

* count

*

* 最大线程池数量

*

*

* maxCount

*

* 队列初始容量

*

*

* aliveSec

*

* 线程连接保持活动秒数(默认60s)

*

*

*

*/

public class PoolConfig {

private int queueCapacity = 200;

private int count = 0;

private int maxCount = 0;

private int aliveSec;

public int getQueueCapacity() {

return queueCapacity;

}

public void setQueueCapacity(int queueCapacity) {

this.queueCapacity = queueCapacity;

}

public void setCount(int count) {

this.count = count;

}

public void setMaxCount(int maxCount) {

this.maxCount = maxCount;

}

public void setAliveSec(int aliveSec) {

this.aliveSec = aliveSec;

}

public int getCount() {

return count;

}

public int getMaxCount() {

return maxCount;

}

public int getAliveSec() {

return aliveSec;

}

}

```

ThreadPoolConfig(线程池配置 yml配置项以thread开头):

```java

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.stereotype.Component;

/**

* 线程池配置(线程池核心配置、各个业务处理的任务数量)

*

*

*

*

* 属性名称

*

* 属性含义

*

*

* pool

*

* 线程池核心配置

* 【{@link PoolConfig}】

*

*

* count

*

* 线程池各个业务任务初始的任务数

*

*

*

*/

@Component

@ConfigurationProperties(prefix="thread")

public class ThreadPoolConfig {

private PoolConfig pool = new PoolConfig();

Map count = new HashMap();

public PoolConfig getPool() {

return pool;

}

public void setPool(PoolConfig pool) {

this.pool = pool;

}

public Map getCount() {

return count;

}

}

```

定义Task注解，方便使用：

```java

@Target(ElementType.TYPE)

@Retention(RetentionPolicy.RUNTIME)

@Documented

@Component

public @interface ExcutorTask {

/**

* The value may indicate a suggestion for a logical ExcutorTask name,

* to be turned into a Spring bean in case of an autodetected ExcutorTask .

* @return the suggested ExcutorTask name, if any

*/

String value() default "";

}

```

通过反射获取使用Task注解的任务集合：

```java

public class Beans {

private static final char PREFIX = '.';

public static ConcurrentMap scanBeanClassNames(){

ConcurrentMap beanClassNames = new ConcurrentHashMap();

ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false);

provider.addIncludeFilter(new AnnotationTypeFilter(ExcutorTask.class));

for(Package pkg : Package.getPackages()){

String basePackage = pkg.getName();

Set components = provider.findCandidateComponents(basePackage);

for (BeanDefinition component : components) {

String beanClassName = component.getBeanClassName();

try {

Class clazz = Class.forName(component.getBeanClassName());

boolean isAnnotationPresent = clazz.isAnnotationPresent(ZimaTask.class);

if(isAnnotationPresent){

ZimaTask task = clazz.getAnnotation(ExcutorTask.class);

String aliasName = task.value();

if(aliasName != null && !"".equals(aliasName)){

beanClassNames.put(aliasName, component.getBeanClassName());

}

}

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

beanClassNames.put(beanClassName.substring(beanClassName.lastIndexOf(PREFIX) + 1), component.getBeanClassName());

}

}

return beanClassNames;

}

}

```

线程执行类TaskPool：

```java

@Component

public class TaskPool {

public ThreadPoolTaskExecutor poolTaskExecutor;

@Autowired

private ThreadPoolConfig threadPoolConfig;

@Autowired

private ApplicationContext context;

private final Integer MAX_POOL_SIZE = 2000;

private PoolConfig poolCfg;

private Map tasksCount;

private ConcurrentMap beanClassNames;

@PostConstruct

public void init() {

beanClassNames = Beans.scanBeanClassNames();

poolTaskExecutor = new ThreadPoolTaskExecutor();

poolCfg = threadPoolConfig.getPool();

tasksCount = threadPoolConfig.getCount();

int corePoolSize = poolCfg.getCount(),

maxPoolSize = poolCfg.getMaxCount(),

queueCapacity = poolCfg.getQueueCapacity(),

minPoolSize = 0, maxCount = (corePoolSize 0){

if(corePoolSize 0){

poolTaskExecutor.setQueueCapacity(queueCapacity);

}

if(corePoolSize > 0){

if(MAX_POOL_SIZE 0){

if(maxPoolSize 0){

poolTaskExecutor.setKeepAliveSeconds(poolCfg.getAliveSec());

}

poolTaskExecutor.initialize();

}

public void execute(Class... clazz){

int i = 0, len = tasksCount.size();

for(; i clazz = Class.forName(beanClassNames.get(args[i].toLowerCase()));

taskObj = context.getBean(clazz);

}

}

if(taskObj != null){

poolTaskExecutor.execute((Runnable) taskObj);

}

}catch(Exception ex){

ex.printStackTrace();

}

}

}

}

public void execute(){

for(String taskName : tasksCount.keySet()){

Integer taskCount = tasksCount.get(taskName);

for(int t = 0; t clazz = Class.forName(beanClassNames.get(taskName));

taskObj = context.getBean(clazz);

}

}

if(taskObj != null){

poolTaskExecutor.execute((Runnable) taskObj);

}

}catch(Exception ex){

ex.printStackTrace();

}

}

}

}

}

```

如何使用？(做事就要做全套 ^_^)1.因为使用的springboot项目，需要在application.properties 或者 application.yml 添加

```plain

#配置执行的task线程数

thread.count.NeedExcutorTask=4

#最大存活时间

thread.pool.aliveSec=300000

#其他配置同理

```

2.将我们写的线程配置进行装载到我们的项目中

```java

@Configuration

public class TaskManager {

@Resource

private TaskPool taskPool;

@PostConstruct

public void executor(){

taskPool.execute();

}

}

```

3.具体使用

```java

@ExcutorTask

public class NeedExcutorTask implements Runnable{

@Override

public void run() {

Thread.sleep(1000L);

log.info("====== 任务执行 =====")

}

}

```