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今天就跟大家聊聊有關怎么在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用程序;2. 面向?qū)ο螅?. 分布性,Java是面向網(wǎng)絡的語言;4. 魯棒性,java提供自動垃圾收集來進行內(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、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)絡上的不同機器。8.解釋執(zhí)行,Java解釋器直接對Java字節(jié)碼進行解釋執(zhí)行。
PoolConfig(線程池核心配置參數(shù)):
/** *線程池核心配置(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; } }**
** * 屬性名稱 * * 屬性含義 * * * queueCapacity * * 基本線程池數(shù)量 * * * count * * 最大線程池數(shù)量 * * * maxCount * * 隊列初始容量 * * * aliveSec * * 線程連接保持活動秒數(shù)(默認60s) *
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; /** *線程池配置(線程池核心配置、各個業(yè)務處理的任務數(shù)量)
* **/ @Component @ConfigurationProperties(prefix="thread") public class ThreadPoolConfig { private PoolConfig pool = new PoolConfig(); Map**
** * 屬性名稱 * * 屬性含義 * * * pool * * 線程池核心配置 * 【{@link PoolConfig}】 * * * count * * 線程池各個業(yè)務任務初始的任務數(shù) * count = new HashMap<>(); public PoolConfig getPool() { return pool; } public void setPool(PoolConfig pool) { this.pool = pool; } public Map 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注解的任務集合:
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;
}
} 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 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 << 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一步的了解嗎?如果還想了解更多知識或者相關內(nèi)容,請關注創(chuàng)新互聯(lián)行業(yè)資訊頻道,感謝大家的支持。