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Copy pathReadWriteSimulation.java
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114 lines (90 loc) · 2.86 KB
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class CustomReadWriteLock {
private int readers = 0;
private boolean writing = false;
public synchronized void lockRead() {
while (writing) {
}
readers++;
}
public synchronized void unlockRead() {
readers--;
if (readers == 0) {
}
}
public synchronized void lockWrite() {
while (readers > 0 || writing) {
}
writing = true;
}
public synchronized void unlockWrite() {
writing = false;
}
}
class SharedData {
private final CustomReadWriteLock lock = new CustomReadWriteLock();
private int data = 0;
public void readData(String readerName) {
lock.lockRead();
System.out.println(readerName + " is reading data: " + data);
for(int j=0;j<1000;j++);
lock.unlockRead();
}
public void writeData(String writerName, int newData) {
lock.lockWrite();
System.out.println(writerName + " is writing data: " + newData);
data = newData;
for(int j=0;j<1000;j++);
lock.unlockWrite();
}
}
class ReaderWorker implements Runnable {
private final String name;
private final SharedData sharedData;
public ReaderWorker(String name, SharedData sharedData) {
this.name = name;
this.sharedData = sharedData;
}
@Override
public void run() {
for (int i = 0; i < 5; i++) {
sharedData.readData(name);
try {
Thread.sleep(200); // Simulate time between reads
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class WriterWorker implements Runnable {
private final String name;
private final SharedData sharedData;
public WriterWorker(String name, SharedData sharedData) {
this.name = name;
this.sharedData = sharedData;
}
@Override
public void run() {
for (int i = 0; i < 5; i++) {
sharedData.writeData(name, i);
try {
Thread.sleep(200); // Simulate time between writes
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public class ReadWriteSimulation {
public static void main(String[] args) {
SharedData sharedData = new SharedData();
Thread reader1 = new Thread(new ReaderWorker("Reader 1", sharedData));
Thread reader2 = new Thread(new ReaderWorker("Reader 2", sharedData));
Thread writer1 = new Thread(new WriterWorker("Writer 1", sharedData));
Thread writer2 = new Thread(new WriterWorker("Writer 2", sharedData));
reader1.start();
reader2.start();
writer1.start();
writer2.start();
}
}