代码
//dubbo线程池数量监控
Class clazz = Class.forName("com.alibaba.dubbo.rpc.protocol.dubbo.status.ThreadPoolStatusChecker");
Method check = clazz.getMethod("check");
Object result = check.invoke(clazz.newInstance());
logger.info(JSONObject.toJSONString(result));原理
1.获取dubbo提供的类的对象
2.读数据即可
dubbo提供的类
/**
* ThreadPoolStatusChecker
*/
@Activate
public class ThreadPoolStatusChecker implements StatusChecker {
@Override
public Status check() {
DataStore dataStore = ExtensionLoader.getExtensionLoader(DataStore.class).getDefaultExtension();
Map executors = dataStore.get(Constants.EXECUTOR_SERVICE_COMPONENT_KEY);
StringBuilder msg = new StringBuilder();
Status.Level level = Status.Level.OK;
for (Map.Entry entry : executors.entrySet()) {
String port = entry.getKey();
ExecutorService executor = (ExecutorService) entry.getValue();
if (executor != null && executor instanceof ThreadPoolExecutor) { //校验是否是线程池
ThreadPoolExecutor tp = (ThreadPoolExecutor) executor;
boolean ok = tp.getActiveCount() < tp.getMaximumPoolSize() - 1;
Status.Level lvl = Status.Level.OK;
if (!ok) {
level = Status.Level.WARN;
lvl = Status.Level.WARN;
}
if (msg.length() > 0) {
msg.append(";");
}
msg.append("Pool status:" + lvl
+ ", max:" + tp.getMaximumPoolSize()
+ ", core:" + tp.getCorePoolSize()
+ ", largest:" + tp.getLargestPoolSize()
+ ", active:" + tp.getActiveCount()
+ ", task:" + tp.getTaskCount()
+ ", service port: " + port);
}
}
return msg.length() == 0 ? new Status(Status.Level.UNKNOWN) : new Status(level, msg.toString());
}
} 字段说明
测试数据
2020-07-09 17:27:02.893|INFO |dlct2FhXhVFR-39-81|xxx.common.filter.dubbo.AccessLogExtFilter.invoke:175||
{"level":"OK",
"message":"Pool status:OK, //线程池状态：正常
max:500, //最大数量
core:500, //core数量
largest:51, //线程池线程数量的峰值，线程池中曾经有过的最大线程数量
active:1, //活跃数量，一直在变化
task:51, //总任务数量=已完成任务数量+未完成任务数量
service port: 12029"}dubbo源码-ThreadPoolStatusChecker
msg.append("Pool status:" + lvl
+ ", max:" + tp.getMaximumPoolSize()
+ ", core:" + tp.getCorePoolSize()
+ ", largest:" + tp.getLargestPoolSize()
+ ", active:" + tp.getActiveCount()
+ ", task:" + tp.getTaskCount()
+ ", service port: " + port);jdk源码-ThreadPoolExecutor
1、getLargestPoolSize
largest:51, //线程池线程数量的峰值，线程池中曾经有过的最大线程数量
/**
* Returns the largest number of threads that have ever
* simultaneously been in the pool.
*
* @return the number of threads
*/
public int getLargestPoolSize() {
final ReentrantLock mainLock = this.mainLock;
mainLock.lock();
try {
return largestPoolSize;
} finally {
mainLock.unlock();
}
}2、getTaskCount
总的任务数量=已完成任务数量 + 任务集合里未完成任务数量
/**
* Counter for completed tasks. Updated only on termination of
* worker threads. Accessed only under mainLock.
*/
private long completedTaskCount; //已完成任务数量
/**
* Returns the approximate total number of tasks that have ever been
* scheduled for execution. Because the states of tasks and
* threads may change dynamically during computation, the returned
* value is only an approximation.
*
* @return the number of tasks
*/
public long getTaskCount() {
final ReentrantLock mainLock = this.mainLock;
mainLock.lock();
try {
long n = completedTaskCount;
for (Worker w : workers) {
n += w.completedTasks;
if (w.isLocked())
++n;
}
return n + workQueue.size(); //已完成任务数量 + 任务集合里未完成任务数量
} finally {
mainLock.unlock();
}
}官方api解释
long getTaskCount()
返回曾计划执行的近似任务总数。