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今天就跟大家聊聊有关怎么在java中利用注解实现一个可配置线程池,可能很多人都不太了解,为了让大家更加了解,小编给大家总结了以下内容,希望大家根据这篇文章可以有所收获。
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1. 简单,只需理解基本的概念,就可以编写适合于各种情况的应用程序;2. 面向对象;3. 分布性,Java是面向网络的语言;4. 鲁棒性,java提供自动垃圾收集来进行内存管理,防止程序员在管理内存时容易产生的错误。;5. 安全性,用于网络、分布环境下的Java必须防止病毒的入侵。6. 体系结构中立,只要安装了Java运行时系统,就可在任意处理器上运行。7. 可移植性,Java可以方便地移植到网络上的不同机器。8.解释执行,Java解释器直接对Java字节码进行解释执行。
PoolConfig(线程池核心配置参数):
/** *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))
* **/ 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; } }*
*
** * 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) *
ThreadPoolConfig(线程池配置 yml配置项以thread开头):
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)
* **/ @Component @ConfigurationProperties(prefix="thread") public class ThreadPoolConfig { private PoolConfig pool = new PoolConfig(); Map*
*
** * 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 * 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:
@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:
public class Beans { private static final char PREFIX = '.'; public static ConcurrentMapscanBeanClassNames(){ 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:
@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 MaptasksCount; 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 << 1); for(String taskName : tasksCount.keySet()){ minPoolSize += tasksCount.get(taskName); } if(corePoolSize > 0){ if(corePoolSize <= minPoolSize){ corePoolSize = minPoolSize; } }else{ corePoolSize = minPoolSize; } if(queueCapacity > 0){ poolTaskExecutor.setQueueCapacity(queueCapacity); } if(corePoolSize > 0){ if(MAX_POOL_SIZE < corePoolSize){ corePoolSize = MAX_POOL_SIZE; } poolTaskExecutor.setCorePoolSize(corePoolSize); } if(maxPoolSize > 0){ if(maxPoolSize <= maxCount){ maxPoolSize = maxCount; } if(MAX_POOL_SIZE < maxPoolSize){ maxPoolSize = MAX_POOL_SIZE; } poolTaskExecutor.setMaxPoolSize(maxPoolSize); } if(poolCfg.getAliveSec() > 0){ poolTaskExecutor.setKeepAliveSeconds(poolCfg.getAliveSec()); } poolTaskExecutor.initialize(); } public void execute(Class>... clazz){ int i = 0, len = tasksCount.size(); for(; i < len; i++){ Integer taskCount = tasksCount.get(i); for(int t = 0; t < taskCount; t++){ try{ Object taskObj = context.getBean(clazz[i]); if(taskObj != null){ poolTaskExecutor.execute((Runnable) taskObj); } }catch(Exception ex){ ex.printStackTrace(); } } } } public void execute(String... args){ int i = 0, len = tasksCount.size(); for(; i < len; i++){ Integer taskCount = tasksCount.get(i); for(int t = 0; t < taskCount; t++){ try{ Object taskObj = null; if(context.containsBean(args[i])){ taskObj = context.getBean(args[i]); }else{ if(beanClassNames.containsKey(args[i].toLowerCase())){ Class> 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 < taskCount; t++){ try{ Object taskObj = null; if(context.containsBean(taskName)){ taskObj = context.getBean(taskName); }else{ if(beanClassNames.containsKey(taskName)){ Class> 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
#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
@Configuration public class TaskManager { @Resource private TaskPool taskPool; @PostConstruct public void executor(){ taskPool.execute(); } }
3.具体使用
@ExcutorTask public class NeedExcutorTask implements Runnable{ @Override public void run() { Thread.sleep(1000L); log.info("====== 任务执行 =====") } }
看完上述内容,你们对怎么在java中利用注解实现一个可配置线程池有进一步的了解吗?如果还想了解更多知识或者相关内容,请关注创新互联行业资讯频道,感谢大家的支持。