记不住密码怎么办？
http://a.app.qq.com/o/simple.jsp?pkgname=com.wa505.kf.epassword
1. 线程池结构模型。
线程池一般情况下需要有三个独立的小模块组成:
a. 任务队列
b. 任务队列协调器
c. 工作线程
下面的图示显示了他们的静态结构图。
2. 线程池交互模型。
下图中显示了其交互模型。
a.客户代码负责入队，
b.工作线程负责loop队列进行工作，同时工作结束后告诉任务队列协调器。
c. 任务队列协调器，协调所有的工作线程和任务队列，使得任务一定可以被执行, 控制线程数目和核心线程数目，同时当客户代码入队时，通知正在wait的工作线程进行工作。
3.测试代码
测试代码进行测试时，模拟一下真实场景。也就是说调用者随机时间点进行调用。执行者的时间也是随机的。
package interview;
public class TestThreadPool {
static volatile int lastIndex = 0;
static final int MAX_SLEEP = 3;
static int runCount = 0;
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("testThreadPoolWithN =============== ");
testThreadPoolWithN();
System.out.println("testThreadPoolWith1 =============== ");
testThreadPoolWith1();
// System.out.println("count " + count);
}
private static void testThreadPoolWith1() {
ThreadPool threadPool = new ThreadPool(1, 1, 0);
for (int i = 0; i < 200; ++i) {
final int index = i;
randomSleep();
threadPool.execute(new Runnable() {
@Override
public void run() {
randomSleep();
assert ((lastIndex + 1) == index);
lastIndex = index;
System.out.println("running " + index);
}
});
}
}
private static void testThreadPoolWithN() {
ThreadPool threadPool = new ThreadPool(10, 20, 0);
for (int i = 0; i < 200; ++i) {
final int index = i;
randomSleep();
threadPool.execute(new Runnable() {
@Override
public void run() {
runCount++;
randomSleep();
System.out.println("running " + index);
}
});
}
assert (runCount == 2000);
}
public static void randomSleep() {
try {
Thread.sleep((long) (Math.random() * MAX_SLEEP));
} catch (InterruptedException e1) {
}
}
}
3.线程池
package interview;
import java.util.LinkedList;
import java.util.Queue;
public class ThreadPool {
private Object mLock = new Object();
private Queue<Runnable> mQueues = new LinkedList<>();
private int mCount = 0;
private int mMaxCount = 3;
private int mCoreSize = 1;
private long mNonCoreKeepLiveTime = 0;
public ThreadPool(int coreSize, int maxSize, long nonCoreKeepLiveTime) {
mCoreSize = coreSize;
mMaxCount = maxSize;
mNonCoreKeepLiveTime = nonCoreKeepLiveTime;
}
public int getRunningCount() {
synchronized (mLock) {
return mCount;
}
}
private class Worker implements Runnable {
private Runnable mFirstTask;
private Worker(Runnable task) {
mFirstTask = task;
}
@Override
public void run() {
if (mFirstTask != null) {
mFirstTask.run();
}
while (true) {
Runnable task;
synchronized (mLock) {
task = mQueues.poll();
}
if (task != null) {
task.run();
continue;
}
synchronized (mLock) {
if (mCount > mCoreSize) {
try {
mLock.wait(mNonCoreKeepLiveTime);
} catch (InterruptedException e) {
}
if (mQueues.isEmpty()) {
break;
}
} else {
if (!mQueues.isEmpty()) continue;
try {
mLock.wait();
} catch (InterruptedException e) {
}
}
}
}
exisWorker(this);
}
}
private void exisWorker(Worker worker) {
int size;
synchronized (mLock) {
mCount--;
size = mQueues.size();
int min = mCoreSize;
if (size > 0 && min == 0) {
min = 1;
}
if (mCount >= min) {
return;
}
}
addWorker();
}
private void addWorker() {
synchronized (mLock) {
if (mCount >= mMaxCount) {
return;
}
mCount++;
}
Thread thread = new Thread(new Worker(null));
thread.start();
}
public void execute(Runnable runnable) {
synchronized (mLock) {
mQueues.add(runnable);
mLock.notifyAll();
}
addWorker();
}
}
4. 打印结果：
testThreadPoolWithN =============== running 0 running 1 running 3 running 2 running 4 running 5 running 6 running 7 running 8 running 9 running 10 running 11 running 12 running 13 running 15 running 14 running 16 running 17 running 19 running 18 running 21 running 20 running 22 running 23 running 24 running 25 running 26 running 27 running 28 running 29 running 30 running 31 running 32 running 33 running 35 running 34 running 36 running 37 running 38 running 39 running 41 running 40 running 42 running 44 running 43 running 45 running 46 running 47 running 48 running 49 running 51 running 50 running 52 running 54 running 53 running 55 running 56 running 57 running 58 running 59 running 60 running 61 running 63 running 62 running 64 running 65 running 67 running 66 running 68 running 69 running 70 running 71 running 72 running 74 running 73 running 76 running 75 running 77 running 79 running 78 running 80 running 81 running 84 running 82 running 85 running 83 running 86 running 88 running 87 running 89 running 90 running 91 running 92 running 93 running 94 running 97 running 96 running 98 running 95 running 99 running 100 running 101 running 102 running 104 running 105 running 103 running 107 running 106 running 108 running 110 running 109 running 112 running 111 running 113 running 114 running 115 running 116 running 117 running 118 running 119 running 120 running 121 running 122 running 123 running 124 running 125 running 126 running 127 running 128 running 129 running 130 running 131 running 133 running 132 running 134 running 136 running 135 running 138 running 137 running 139 running 140 running 141 running 142 running 143 running 144 running 145 running 146 running 147 running 148 running 149 running 150 running 151 running 152 running 153 running 154 running 155 running 156 running 157 running 158 running 160 running 161 running 159 running 164 running 165 running 162 running 163 running 166 running 167 running 168 running 169 running 170 running 171 running 172 running 173 running 174 running 175 running 176 running 177 running 180 running 179 running 178 running 182 running 181 running 183 running 184 running 185 running 186 running 188 running 187 running 189 running 190 running 191 running 192 running 194 running 193 running 195 running 196 running 197 running 198 running 199 testThreadPoolWith1 =============== running 0 running 1 running 2 running 3 running 4 running 5 running 6 running 7 running 8 running 9 running 10 running 11 running 12 running 13 running 14 running 15 running 16 running 17 running 18 running 19 running 20 running 21 running 22 running 23 running 24 running 25 running 26 running 27 running 28 running 29 running 30 running 31 running 32 running 33 running 34 running 35 running 36 running 37 running 38 running 39 running 40 running 41 running 42 running 43 running 44 running 45 running 46 running 47 running 48 running 49 running 50 running 51 running 52 running 53 running 54 running 55 running 56 running 57 running 58 running 59 running 60 running 61 running 62 running 63 running 64 running 65 running 66 running 67 running 68 running 69 running 70 running 71 running 72 running 73 running 74 running 75 running 76 running 77 running 78 running 79 running 80 running 81 running 82 running 83 running 84 running 85 running 86 running 87 running 88 running 89 running 90 running 91 running 92 running 93 running 94 running 95 running 96 running 97 running 98 running 99 running 100 running 101 running 102 running 103 running 104 running 105 running 106 running 107 running 108 running 109 running 110 running 111 running 112 running 113 running 114 running 115 running 116 running 117 running 118 running 119 running 120 running 121 running 122 running 123 running 124 running 125 running 126 running 127 running 128 running 129 running 130 running 131 running 132 running 133 running 134 running 135 running 136 running 137 running 138 running 139 running 140 running 141 running 142 running 143 running 144 running 145 running 146 running 147 running 148 running 149 running 150 running 151 running 152 running 153 running 154 running 155 running 156 running 157 running 158 running 159 running 160 running 161 running 162 running 163 running 164 running 165 running 166 running 167 running 168 running 169 running 170 running 171 running 172 running 173 running 174 running 175 running 176 running 177 running 178 running 179 running 180 running 181 running 182 running 183 running 184 running 185 running 186 running 187 running 188 running 189 running 190 running 191 running 192 running 193 running 194 running 195 running 196 running 197 running 198 running 199
从上面结果可以看出，单线程按照顺序进行执行。而多线程则是无顺序的。
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