1. use ThreadPoolExecutor to do some data work, the thread number is solid. for example:storing data into cache, process large mount of data.
import java.util.Properties;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class Controller1 
{
public static void main(String[] args) {
// initial parameters
int iNumberOfThreads = 5;
Properties prop = new Properties();
// start thread running
BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(100,
true);
ThreadPoolExecutor executor = new ThreadPoolExecutor(
iNumberOfThreads, // core size
iNumberOfThreads, // max size
1, // keep alive time
TimeUnit.MINUTES, // keep alive time units
queue);
for (int k = 0; k < iNumberOfThreads; k++) {
SingleThread1 ct = new SingleThread1(k, prop);
executor.execute(ct);
}
System.out.println("Expired Active threads = " + executor.getActiveCount());
executor.shutdown();
try {
boolean isEnd = false;
while (!isEnd) {
isEnd = executor.awaitTermination(10000,
TimeUnit.SECONDS);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
import java.util.Properties;
public class SingleThread1 implements Runnable {
int threadIdx;
Properties prop;
public SingleThread1(int threadIdx, Properties prop) {
super();
this.threadIdx = threadIdx;
this.prop = prop;
}
@Override
public void run() {
int i = 0;
while(i < 10){
System.out.println("Thread " + threadIdx + " output number " + i + ".");
i ++;
}
}
}
2. use ThreadPoolExecutor do some work in limited time, for example: load test.
import java.util.Properties;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class Controller2 {
static long testStartTimer = 0;
static int iDurationSecs = 0;
/** *//**
* @param args
*/
public static void main(String[] args) {
// initial parameters
int iNumberOfThreads = 10;
Properties prop = new Properties();
testStartTimer = System.currentTimeMillis();
iDurationSecs = 10;
// start thread running
BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(100,
true);
ThreadPoolExecutor executor = new ThreadPoolExecutor(
iNumberOfThreads, // core size
iNumberOfThreads, // max size
1, // keep alive time
TimeUnit.MINUTES, // keep alive time units
queue);
int i = 0;
while(!timerExpired()){
if (executor.getActiveCount() >= iNumberOfThreads) {
// build the system command we want to run
try {
Thread.sleep(100);
continue;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
SingleThread2 ct = new SingleThread2(i, prop);
executor.execute(ct);
i ++;
}
System.out.println("Expired Active threads = " + executor.getActiveCount());
executor.shutdown();
try {
int waittime = iNumberOfThreads + 10;
executor.awaitTermination(waittime, TimeUnit.SECONDS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static boolean timerExpired() {
Long now = System.currentTimeMillis();
if ((now - testStartTimer) > (iDurationSecs * 1000))
return true;
else
return false;
}
}
import java.util.Properties;
public class SingleThread2 implements Runnable {
Properties prop;
int threadId;
public SingleThread2(int threadId, Properties prop) {
super();
this.threadId = threadId;
this.prop = prop;
}
int i = 0;
@Override
public void run() {
System.out.println("SingleThread2 " + threadId + " output number " + i + ".");
i++;
}
} posted on 2012-11-27 13:43
ゞ沉默是金ゞ 阅读(304)
评论(0) 编辑 收藏 所属分类:
Java SE