今天就跟大家聊聊有關(guān)怎么在java中利用注解實現(xiàn)一個可配置線程池,可能很多人都不太了解,為了讓大家更加了解,小編給大家總結(jié)了以下內(nèi)容,希望大家根據(jù)這篇文章可以有所收獲。
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1. 簡單,只需理解基本的概念,就可以編寫適合于各種情況的應(yīng)用程序;2. 面向?qū)ο螅?. 分布性,Java是面向網(wǎng)絡(luò)的語言;4. 魯棒性,java提供自動垃圾收集來進(jìn)行內(nèi)存管理,防止程序員在管理內(nèi)存時容易產(chǎn)生的錯誤。;5. 安全性,用于網(wǎng)絡(luò)、分布環(huán)境下的Java必須防止病毒的入侵。6. 體系結(jié)構(gòu)中立,只要安裝了Java運行時系統(tǒng),就可在任意處理器上運行。7. 可移植性,Java可以方便地移植到網(wǎng)絡(luò)上的不同機(jī)器。8.解釋執(zhí)行,Java解釋器直接對Java字節(jié)碼進(jìn)行解釋執(zhí)行。
PoolConfig(線程池核心配置參數(shù)):
/** * <h2>線程池核心配置(<b >基本線程池數(shù)量、最大線程池數(shù)量、隊列初始容量、線程連接保持活動秒數(shù)(默認(rèn)60s)</b>)</h2> * * <blockquote><code> * <table border="1px" width="100%"><tbody> * <tr><th > * 屬性名稱 * </th><th > * 屬性含義 * </th></tr> * <tr><td> * queueCapacity * </td><td> * 基本線程池數(shù)量 * </td></tr> * <tr><td> * count * </td><td> * 最大線程池數(shù)量 * </td></tr> * <tr><td> * maxCount * </td><td> * 隊列初始容量 * </td></tr> * <tr><td> * aliveSec * </td><td> * 線程連接保持活動秒數(shù)(默認(rèn)60s) * </td></tr> * </tbody></table> * </code></blockquote> */ 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(線程池配置 yml配置項以thread開頭):
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; /** * <h2>線程池配置(<b >線程池核心配置、各個業(yè)務(wù)處理的任務(wù)數(shù)量</b>)</h2> * * <blockquote><code> * <table border="1px" width="100%"><tbody> * <tr><th > * 屬性名稱 * </th><th > * 屬性含義 * </th></tr> * <tr><td> * pool * </td><td> * 線程池核心配置 * 【{@link PoolConfig}】 * </td></tr> * <tr><td> * count * </td><td> * 線程池各個業(yè)務(wù)任務(wù)初始的任務(wù)數(shù) * </td></tr> * </tbody></table> * </code></blockquote> */ @Component @ConfigurationProperties(prefix="thread") public class ThreadPoolConfig { private PoolConfig pool = new PoolConfig(); Map<String, Integer> count = new HashMap<>(); public PoolConfig getPool() { return pool; } public void setPool(PoolConfig pool) { this.pool = pool; } public Map<String, Integer> getCount() { return count; } }
定義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 ""; }
通過反射獲取使用Task注解的任務(wù)集合:
public class Beans { private static final char PREFIX = '.'; public static ConcurrentMap<String, String> scanBeanClassNames(){ ConcurrentMap<String, String> beanClassNames = new ConcurrentHashMap<>(); ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(false); provider.addIncludeFilter(new AnnotationTypeFilter(ExcutorTask.class)); for(Package pkg : Package.getPackages()){ String basePackage = pkg.getName(); Set<BeanDefinition> 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; } }
線程執(zhí)行類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 Map<String, Integer> tasksCount; private ConcurrentMap<String, String> 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.因為使用的springboot項目,需要在application.properties 或者 application.yml 添加
#配置執(zhí)行的task線程數(shù) thread.count.NeedExcutorTask=4 #最大存活時間 thread.pool.aliveSec=300000 #其他配置同理
2.將我們寫的線程配置進(jìn)行裝載到我們的項目中
@Configuration public class TaskManager { @Resource private TaskPool taskPool; @PostConstruct public void executor(){ taskPool.execute(); } }
3.具體使用
@ExcutorTask public class NeedExcutorTask implements Runnable{ @Override public void run() { Thread.sleep(1000L); log.info("====== 任務(wù)執(zhí)行 =====") } }
看完上述內(nèi)容,你們對怎么在java中利用注解實現(xiàn)一個可配置線程池有進(jìn)一步的了解嗎?如果還想了解更多知識或者相關(guān)內(nèi)容,請關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道,感謝大家的支持。
新聞標(biāo)題:怎么在java中利用注解實現(xiàn)一個可配置線程池
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