Question
Q: give me the class main for this code import java.util.concurrent.Semaphore; public class SharedDatabase { // Semaphore to control access to the database private Semaphore
Q: give me the class main for this code
import java.util.concurrent.Semaphore;
public class SharedDatabase {
// Semaphore to control access to the database
private Semaphore semaphore;
// Count of the number of readers currently accessing the database
private int readerCount;
// The shared data in the database
private int data;
public SharedDatabase() {
this.semaphore = new Semaphore(1);
this.readerCount = 0;
}
public int readData() throws InterruptedException {
// Acquire the semaphore
semaphore.acquire();
// Increment the number of readers
readerCount++;
// If this is the first reader, acquire the semaphore again to prevent writers from accessing
if (readerCount == 1) {
semaphore.acquire();
}
// Release the semaphore
semaphore.release();
// Read the data
int readData = data;
// Acquire the semaphore
semaphore.acquire();
// Decrement the number of readers
readerCount--;
// If this is the last reader, release the semaphore to allow writers to access
if (readerCount == 0) {
semaphore.release();
}
// Release the semaphore
semaphore.release();
// Return the read data
return readData;
}
public void writeData(int data) throws InterruptedException {
// Acquire the semaphore to prevent readers and other writers from accessing
semaphore.acquire();
// Write the data
this.data = data;
// Release the semaphore to allow readers and other writers to access
semaphore.release();
}
}
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