mirror of https://github.com/sethm/symon.git
82 lines
2.3 KiB
Java
82 lines
2.3 KiB
Java
/*
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* Copyright (c) 2008-2014 Seth J. Morabito <web@loomcom.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.loomcom.symon.util;
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import com.loomcom.symon.exceptions.*;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.Queue;
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/**
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* A FIFO buffer with a bounded maximum size.
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*/
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public class FifoRingBuffer<E> implements Iterable<E> {
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private Queue<E> fifoBuffer;
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private int maxLength;
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public FifoRingBuffer(int maxLength) {
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this.fifoBuffer = new LinkedList<E>();
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this.maxLength = maxLength;
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}
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public E pop() throws FifoUnderrunException {
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return fifoBuffer.remove();
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}
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public boolean isEmpty() {
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return fifoBuffer.isEmpty();
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}
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public void push(E val) {
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if (fifoBuffer.size() == maxLength) {
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// Delete the oldest element.
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fifoBuffer.remove();
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}
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fifoBuffer.offer(val);
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}
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public E peek() {
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return fifoBuffer.peek();
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}
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public void reset() {
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fifoBuffer.clear();
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}
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public int length() {
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return fifoBuffer.size();
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}
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public String toString() {
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return "[FifoRingBuffer: size=" + fifoBuffer.size() + "]";
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}
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public Iterator<E> iterator() {
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return fifoBuffer.iterator();
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}
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}
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