摘要：
1.pom引入guava依赖 1.Pom引入了番石榴依赖＜dependency＞＜groupId＞com。谷歌。番石榴番石榴23.01.ThreadUtilsimplortcom。谷歌。常见的util。同时发生的螺纹系数Bu
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>23.0</version>
</dependency>
import com.google.common.util.concurrent.ThreadFactoryBuilder;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.concurrent.*;
/**
* thread utils
*/
public class ThreadUtils {
private static final ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
private static final int STACK_DEPTH = 20;
public static ThreadPoolExecutor newDaemonCachedThreadPool(String prefix){
ThreadFactory threadFactory = namedThreadFactory(prefix);
return ((ThreadPoolExecutor) Executors.newCachedThreadPool(threadFactory));
}
private static ThreadFactory namedThreadFactory(String prefix) {
return new ThreadFactoryBuilder().setDaemon(true).setNameFormat(prefix + "-%d").build();
}
public static ThreadPoolExecutor newDaemonCachedThreadPool(String prefix ,
int maxThreadNumber,
int keepAliveSeconds){
ThreadFactory threadFactory = namedThreadFactory(prefix);
ThreadPoolExecutor threadPool = new ThreadPoolExecutor(
// corePoolSize: the max number of threads to create before queuing the tasks
maxThreadNumber,
// maximumPoolSize: because we use LinkedBlockingDeque, this one is not used
maxThreadNumber,
keepAliveSeconds,
TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
threadFactory);
threadPool.allowCoreThreadTimeOut(true);
return threadPool;
}
public static ThreadPoolExecutor newDaemonFixedThreadPool(int nThreads , String prefix){
ThreadFactory threadFactory = namedThreadFactory(prefix);
return ((ThreadPoolExecutor) Executors.newFixedThreadPool(nThreads, threadFactory));
}
public static ExecutorService newDaemonSingleThreadExecutor(String threadName){
ThreadFactory threadFactory = new ThreadFactoryBuilder()
.setDaemon(true)
.setNameFormat(threadName)
.build();
return Executors.newSingleThreadExecutor(threadFactory);
}
public static ExecutorService newDaemonFixedThreadExecutor(String threadName,int threadsNum){
ThreadFactory threadFactory = new ThreadFactoryBuilder()
.setDaemon(true)
.setNameFormat(threadName)
.build();
return Executors.newFixedThreadPool(threadsNum, threadFactory);
}
public static ScheduledExecutorService newDaemonThreadScheduledExecutor(String threadName, int corePoolSize) {
return newThreadScheduledExecutor(threadName, corePoolSize, true);
}
public static ScheduledExecutorService newThreadScheduledExecutor(String threadName, int corePoolSize, boolean isDaemon) {
ThreadFactory threadFactory = new ThreadFactoryBuilder()
.setDaemon(isDaemon)
.setNameFormat(threadName)
.build();
ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(corePoolSize, threadFactory);
// By default, a cancelled task is not automatically removed from the work queue until its delay
// elapses. We have to enable it manually.
executor.setRemoveOnCancelPolicy(true);
return executor;
}
public static ThreadInfo getThreadInfo(Thread t) {
long tid = t.getId();
return threadBean.getThreadInfo(tid, STACK_DEPTH);
}
public static String formatThreadInfo(ThreadInfo threadInfo, String indent) {
StringBuilder sb = new StringBuilder();
appendThreadInfo(sb, threadInfo, indent);
return sb.toString();
}
public static void appendThreadInfo(StringBuilder sb,
ThreadInfo info,
String indent) {
boolean contention = threadBean.isThreadContentionMonitoringEnabled();
if (info == null) {
sb.append(indent).append("Inactive (perhaps exited while monitoring was done)
");
return;
}
String taskName = getTaskName(info.getThreadId(), info.getThreadName());
sb.append(indent).append("Thread ").append(taskName).append(":
");
Thread.State state = info.getThreadState();
sb.append(indent).append(" State: ").append(state).append("
");
sb.append(indent).append(" Blocked count: ").append(info.getBlockedCount()).append("
");
sb.append(indent).append(" Waited count: ").append(info.getWaitedCount()).append("
");
if (contention) {
sb.append(indent).append(" Blocked time: " + info.getBlockedTime()).append("
");
sb.append(indent).append(" Waited time: " + info.getWaitedTime()).append("
");
}
if (state == Thread.State.WAITING) {
sb.append(indent).append(" Waiting on ").append(info.getLockName()).append("
");
} else if (state == Thread.State.BLOCKED) {
sb.append(indent).append(" Blocked on ").append(info.getLockName()).append("
");
sb.append(indent).append(" Blocked by ").append(
getTaskName(info.getLockOwnerId(), info.getLockOwnerName())).append("
");
}
sb.append(indent).append(" Stack:").append("
");
for (StackTraceElement frame: info.getStackTrace()) {
sb.append(indent).append(" ").append(frame.toString()).append("
");
}
}
private static String getTaskName(long id, String name) {
if (name == null) {
return Long.toString(id);
}
return id + " (" + name + ")";
}
public static void sleep(final long millis) {
try {
Thread.sleep(millis);
} catch (final InterruptedException ignore) {}
}
}
import java.util.concurrent.ThreadPoolExecutor;
...
ThreadPoolExecutor execService = (ThreadPoolExecutor) ThreadUtils.newDaemonFixedThreadExecutor("Executor-Thread", 20);