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write and read sequence volatile

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This commit is contained in:
priyank-sriv 2020-06-15 18:44:01 +05:30
parent 5263fbf070
commit a4efb737a8
1 changed files with 21 additions and 24 deletions
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45
data-structures/src/main/java/com/baeldung/circularbuffer/CircularBuffer.java
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@ -2,27 +2,35 @@ package com.baeldung.circularbuffer;
public class CircularBuffer<E> {
private int capacity, writeIndex, readIndex;
private E[] data;
private static final int DEFAULT_CAPACITY = 8;
private final int capacity;
private final E[] data;
private volatile int writeSequence, readSequence;
@SuppressWarnings("unchecked")
public CircularBuffer(int capacity) {
this.capacity = capacity;
this.capacity = (capacity < 1 ? DEFAULT_CAPACITY : capacity);
this.data = (E[]) new Object[capacity];
this.readIndex = 0;
this.writeIndex = -1;
this.readSequence = 0;
this.writeSequence = -1;
}
/**
* Adds a new element to the buffer, if the buffer is not full
* @param element
* @return
*/
public boolean offer(E element) {
if (!isFull()) {
writeIndex += 1;
int nextWriteIndex = writeIndex % capacity;
data[nextWriteIndex] = element;
int nextWriteSeq = writeSequence + 1;
data[nextWriteSeq % capacity] = element;
writeSequence += 1;
return true;
}
@ -33,20 +41,9 @@ public class CircularBuffer<E> {
if (!isEmpty()) {
int nextReadIndex = readIndex % capacity;
readIndex += 1;
return data[nextReadIndex];
}
return null;
}
public E peek() {
if (!isEmpty()) {
return data[readIndex % capacity];
E nextValue = data[readSequence % capacity];
readSequence += 1;
return nextValue;
}
return null;
@ -58,12 +55,12 @@ public class CircularBuffer<E> {
public int size() {
return (writeIndex - readIndex) + 1;
return (writeSequence - readSequence) + 1;
}
public boolean isEmpty() {
return writeIndex < readIndex;
return writeSequence < readSequence;
}
public boolean isFull() {