java 注解实现一个可配置线程池的方法示例

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):

/**
 * <h1>线程池核心配置(<b style="color:#cd0000">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）</b>)</h1>
 * 
 * <blockquote><code>
 * <table border="1px" style="border-color:gray;" width="100%"><tbody>
 * <tr><th style="color:green;text-align:left;">
 * 属性名称
 * </th><th style="color:green;text-align:left;">
 * 属性含义
 * </th></tr>
 * <tr><td>
 * queuecapacity
 * </td><td>
 * 基本线程池数量
 * </td></tr>
 * <tr><td>
 * count
 * </td><td>
 * 最大线程池数量
 * </td></tr>
 * <tr><td>
 * maxcount
 * </td><td>
 * 队列初始容量
 * </td></tr>
 * <tr><td>
 * alivesec
 * </td><td>
 * 线程连接保持活动秒数（默认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(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;
 
/**
 * <h1>线程池配置(<b style="color:#cd0000">线程池核心配置、各个业务处理的任务数量</b>)</h1>
 * 
 * <blockquote><code>
 * <table border="1px" style="border-color:gray;" width="100%"><tbody>
 * <tr><th style="color:green;text-align:left;">
 * 属性名称
 * </th><th style="color:green;text-align:left;">
 * 属性含义
 * </th></tr>
 * <tr><td>
 * pool
 * </td><td>
 * 线程池核心配置
 * 【{@link poolconfig}】
 * </td></tr>
 * <tr><td>
 * count
 * </td><td>
 * 线程池各个业务任务初始的任务数
 * </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 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;
  } 
}

 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 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 =====")
  }
}

以上就是创建一个可扩展的线程池相关的配置（望指教~~~）。希望对大家的学习有所帮助，也希望大家多多支持。