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Copy pathThreadOrderRun2.java
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274 lines (257 loc) · 8.28 KB
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package thread;
import org.junit.Test;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* @Author: wei1
* @Date: Create in 2018/10/11 20:47
* @Description: 使得多线程按顺序执行
* 思路：使用join
*/
public class ThreadOrderRun2 {
Lock lock1 = new ReentrantLock();
Lock lock2 = new ReentrantLock();
Lock lock3 = new ReentrantLock();
Lock lock4 = new ReentrantLock();
String[] fileNames = {"A", "B", "C", "D"};
volatile boolean[] fileCanWrite = {true, true, true, true};
Condition condition1 = lock1.newCondition();
Condition condition2 = lock1.newCondition();
Condition condition3 = lock1.newCondition();
Condition condition4 = lock1.newCondition();
// Condition condition2 = lock2.newCondition();
// Condition condition3 = lock3.newCondition();
// Condition condition4 = lock4.newCondition();
File fileA = new File("A.txt");
File fileB = new File("B.txt");
File fileC = new File("C.txt");
File fileD = new File("D.txt");
FileWriter fwA;
FileWriter fwB;
FileWriter fwC;
FileWriter fwD;
public ThreadOrderRun2() throws IOException {
//初始化创建文件A Ｂ C D
if (fileA.exists() || fileB.exists() || fileC.exists() || fileD.exists()) {
fileA.delete();
fileB.delete();
fileC.delete();
fileD.delete();
}
fileA.createNewFile();
fileB.createNewFile();
fileC.createNewFile();
fileD.createNewFile();
fwA = new FileWriter(fileA);
fwB = new FileWriter(fileB);
fwC = new FileWriter(fileC);
fwD = new FileWriter(fileD);
}
@Test
public void test1() throws IOException {
fileA.createNewFile();
}
volatile int needFileId1 = 0;
volatile int needFileId2 = 1;
volatile int needFileId3 = 2;
volatile int needFileId4 = 3;
private void firstRun() {
while (true) {
lock1.lock();
try {
if (!fileCanWrite[needFileId1]) {
condition1.await();
}
fileCanWrite[needFileId1] = !fileCanWrite[needFileId1];
fileWriter("file" + fileNames[needFileId1], "1 ");
int formerNeed = needFileId1;
needFileId1 = (needFileId1 + 1) % 4;
fileCanWrite[formerNeed] = !fileCanWrite[formerNeed];
if (needFileId2 == formerNeed) {
condition2.signal();
}
if (needFileId3 == formerNeed) {
condition3.signal();
}
if (needFileId4 == formerNeed) {
condition4.signal();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
lock1.unlock();
}
}
}
private void secondRun() {
while (true) {
// lock2.lock();
lock1.lock();
try {
if (!fileCanWrite[needFileId2]) {
condition2.await();
}
fileCanWrite[needFileId2] = !fileCanWrite[needFileId2];
fileWriter("file" + fileNames[needFileId2], "2 ");
int formerNeed = needFileId2;
needFileId2 = (needFileId2 + 1) % 4;
fileCanWrite[formerNeed] = !fileCanWrite[formerNeed];
if (needFileId1 == formerNeed) {
condition1.signal();
}
if (needFileId3 == formerNeed) {
condition3.signal();
}
if (needFileId4 == formerNeed) {
condition4.signal();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
lock1.unlock();
}
}
}
private void thirdRun() {
while (true) {
// lock3.lock();
lock1.lock();
try {
if (!fileCanWrite[needFileId3]) {
condition3.await();
}
fileCanWrite[needFileId3] = !fileCanWrite[needFileId3];
fileWriter("file" + fileNames[needFileId3], "3 ");
int formerNeed = needFileId3;
needFileId3 = (needFileId3 + 1) % 4;
fileCanWrite[formerNeed] = !fileCanWrite[formerNeed];
if (needFileId1 == formerNeed) {
condition1.signal();
}
if (needFileId2 == formerNeed) {
condition2.signal();
}
if (needFileId4 == formerNeed) {
condition4.signal();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// lock3.unlock();
lock1.unlock();
}
}
}
private void fourthRun() {
while (true) {
// lock4.lock();
lock1.lock();
try {
if (!fileCanWrite[needFileId4]) {
condition4.await();
}
fileCanWrite[needFileId4] = !fileCanWrite[needFileId4];
fileWriter("file" + fileNames[needFileId4], "4 ");
int formerNeed = needFileId4;
needFileId4 = (needFileId4 + 1) % 4;
fileCanWrite[formerNeed] = !fileCanWrite[formerNeed];
if (needFileId1 == formerNeed) {
condition1.signal();
}
if (needFileId2 == formerNeed) {
condition2.signal();
}
if (needFileId3 == formerNeed) {
condition3.signal();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
lock1.unlock();
}
}
}
private void fileWriter(String fileName, String ch) throws IOException {
if (fileName == null) {
return;
}
if (fileName.equals("fileA")) {
fwA.write(ch);
fwA.flush();
}
if (fileName.equals("fileB")) {
fwB.write(ch);
fwB.flush();
}
if (fileName.equals("fileC")) {
fwC.write(ch);
fwC.flush();
}
if (fileName.equals("fileD")) {
fwD.write(ch);
fwD.flush();
}
}
// @Test
// public void testOrder() {
// new Thread(new Runnable() {
// @Override
// public void run() {
// firstRun(5);
// }
// }, "thread---1").start();
//
// new Thread(new Runnable() {
// @Override
// public void run() {
// secondRun(5);
// }
// }, "thread---2").start();
//
// new Thread(new Runnable() {
// @Override
// public void run() {
// thirdRun(5);
// }
// }, "thread---3").start();
// }
public static void main(String[] args) throws IOException {
ThreadOrderRun2 threadOrderRun2 = new ThreadOrderRun2();
new Thread(new Runnable() {
@Override
public void run() {
threadOrderRun2.firstRun();
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
threadOrderRun2.secondRun();
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
threadOrderRun2.thirdRun();
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
threadOrderRun2.fourthRun();
}
}).start();
}
}