这篇文章主要讲解了“java集合类深的实例用法”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“java集合类深的实例用法”吧!
在做云计算xenserverAPI 连接xenserver和关闭xenserver时候,由于有定时任务每分钟刷新一次,定时任务中存取数据时候会经常的连接和关闭xenserver,造成xenserver的连接阻塞,所以把连接放入队列中进行连接和断开…………
/**
* xenserverAPI调用接口
* @author hanxuan
* @version 2016-12-14 */public class XenPool {private static Logger logger = Logger.getLogger(XenPool.class);private static final int XENSERVER_POOL_CAPACITY=20;private static Map<String,Queue<Connection>> pool = new ConcurrentHashMap(100);public XenPool(){}public synchronized static Connection getConnect(XenServer xenServer) {
URL url =null;try {
url = new URL(xenServer.Hostname);
} catch (MalformedURLException e) {
e.printStackTrace();return null;
}
String host=url.getHost();
Queue queue = pool.get(host);
Connection connection = null;if (queue != null) {
Object conn = queue.poll();if (conn != null) {
connection = (Connection) conn;
}
}if (connection==null){try {
connection = new Connection(new URL(xenServer.Hostname), XenServer.REPLY_WAIT, XenServer.CONNECT_WAIT);
} catch (MalformedURLException e) {logger.error("xenserver[" + xenServer.Hostname + "]建立连接异常!",e);
}try {
Session.loginWithPassword(connection, xenServer.Username, SystemService.decryptPassword(xenServer.Password), APIVersion.latest().toString());
} catch (Types.XenAPIException e) {logger.error("xenserver[" + xenServer.Hostname + "]XenAPIException异常!",e);
} catch (XmlRpcException e) {logger.error("xenserver[" + xenServer.Hostname + "]XmlRpcException异常!",e);
}
}return connection;
}public static void disconnect (Connection connection) {
String host= null;try {
host = connection.getConfig().getServerURL().getHost();
} catch (Exception e) {
e.printStackTrace();return;
}
Queue queue = pool.get(host);if (queue==null){
queue = new ArrayBlockingQueue(XENSERVER_POOL_CAPACITY);pool.put(host, queue);
}boolean flag=queue.offer(connection);if (!flag){//当连接不用时放到队列里 try {
Session.logout(connection);
} catch (Types.XenAPIException e) {logger.error("xenserver[" + host + "]释放异常!",e);
} catch (XmlRpcException e) {logger.error("xenserver[" + host + "]释放异常!",e);
}
}
}
}
感谢各位的阅读,以上就是“java集合类深的实例用法”的内容了,经过本文的学习后,相信大家对java集合类深的实例用法这一问题有了更深刻的体会,具体使用情况还需要大家实践验证。这里是天达云,小编将为大家推送更多相关知识点的文章,欢迎关注!