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GeezerVison is showing github.com — Java/DataStructures/Buffers/CircularBuffer.java at master · smeda2205/Java

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CircularBuffer.java

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package DataStructures.Buffers;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
public class CircularBuffer {
private char[] _buffer;
public final int _buffer_size;
private int _write_index = 0;
private int _read_index = 0;
private AtomicInteger _readable_data = new AtomicInteger(0);
public CircularBuffer(int buffer_size) {
if (!IsPowerOfTwo(buffer_size)) {
throw new IllegalArgumentException();
}
this._buffer_size = buffer_size;
_buffer = new char[buffer_size];
}
private boolean IsPowerOfTwo(int i) {
return (i & (i - 1)) == 0;
}
private int getTrueIndex(int i) {
return i % _buffer_size;
}
public Character readOutChar() {
Character result = null;
//if we have data to read
if (_readable_data.get() > 0) {
result = new Character(_buffer[getTrueIndex(_read_index)]);
_readable_data.decrementAndGet();
_read_index++;
}
return result;
}
public boolean writeToCharBuffer(char c) {
boolean result = false;
//if we can write to the buffer
if (_readable_data.get() < _buffer_size) {
//write to buffer
_buffer[getTrueIndex(_write_index)] = c;
_readable_data.incrementAndGet();
_write_index++;
result = true;
}
return result;
}
private static class TestWriteWorker implements Runnable {
String _alphabet = "abcdefghijklmnopqrstuvwxyz0123456789";
Random _random = new Random();
CircularBuffer _buffer;
public TestWriteWorker(CircularBuffer cb) {
this._buffer = cb;
}
private char getRandomChar() {
return _alphabet.charAt(_random.nextInt(_alphabet.length()));
}
public void run() {
while (!Thread.interrupted()) {
if (!_buffer.writeToCharBuffer(getRandomChar())) {
Thread.yield();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
return;
}
}
}
}
}
private static class TestReadWorker implements Runnable {
CircularBuffer _buffer;
public TestReadWorker(CircularBuffer cb) {
this._buffer = cb;
}
@Override
public void run() {
System.out.println("Printing Buffer:");
while (!Thread.interrupted()) {
Character c = _buffer.readOutChar();
if (c != null) {
System.out.print(c.charValue());
} else {
Thread.yield();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
System.out.println();
return;
}
}
}
}
}
public static void main(String[] args) throws InterruptedException {
int buffer_size = 1024;
//create circular buffer
CircularBuffer cb = new CircularBuffer(buffer_size);
//create threads that read and write the buffer.
Thread write_thread = new Thread(new TestWriteWorker(cb));
Thread read_thread = new Thread(new TestReadWorker(cb));
read_thread.start();
write_thread.start();
//wait some amount of time
Thread.sleep(10000);
//interrupt threads and exit
write_thread.interrupt();
read_thread.interrupt();
}
}
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