用LinkedList实现的一个数据缓冲区

     在做一个解析XML文件的功能时，发现处理XML文件并做其它操作的时候，如果无限制的把XML文件放到LIST中，等待处理，当放入LIST中的速度过快，而解析处理XML效率过低时，会导致内存溢出的错误。遂写了一个数据缓冲区解决上述问题！源码如下：     

import java.util.Collections;import java.util.LinkedList;import java.util.List;//存放XML文件的一个缓冲区public class XmlBuffer implements Runnable {// 实际存放文件的链表public static List xmlQueue = Collections.synchronizedList(new LinkedList());// 队列的当前长度public static long indicator = 0;// 队列的最大长度public static final long BUF_LIMIT = 500000000;public XmlBuffer() {}private String name = "";public XmlBuffer(String threadName) {this.name = threadName;}public String getName() {return this.name;}public void enqueue(byte[] data, String type) {XmlEntity newXml = new XmlEntity();newXml.setContent(data);newXml.setType(type);synchronized (xmlQueue) {// 判断当前队列是否已经满了。如果没有空间了，等待for (;;) {if (this.indicator > BUF_LIMIT|| this.indicator + data.length > BUF_LIMIT) {try {xmlQueue.wait();} catch (InterruptedException ie) {// 处理对应的异常}} else {break;}}}synchronized (xmlQueue) {xmlQueue.add(newXml);this.indicator += newXml.length();xmlQueue.notifyAll();}}class XmlEntity {void put_dataRaw() {dealData(this.content, this.type);}private void dealData(byte[] buf, String type) {// 处理业务}XmlEntity() {}public void setContent(byte[] content) {this.content = content;}public byte[] getContent() {return content;}public int length() {return content.length;}public void setType(String type) {this.type = type;}public String getType() {return this.type;}private byte[] content;private String type = "";}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stub}// 在队列中取出XML文件，并做相应的处理public void run() {for (;;) {synchronized (xmlQueue) {for (;;) {try {if (indicator <= 0) {// wait for data writerxmlQueue.wait();} else {break;}} catch (InterruptedException ex) {// 处理对应的异常}}}try {XmlEntity xml = null;synchronized (xmlQueue) {xml = (XmlEntity) xmlQueue.remove(0);this.indicator -= xml.length();xmlQueue.notifyAll();}if (xml == null) {continue;}// 针对XML文件进行操作xml.put_dataRaw();} catch (Exception e) {if (e instanceof IndexOutOfBoundsException) {continue;} else {// 处理异常}}}}}