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JavaPNS施用与吐槽

热度:9220   发布时间:2013-02-26 00:00:00.0
JavaPNS使用与吐槽
苹果平台开发的应用程序,不支持后台运行程序,所以苹果有一个推送服务在软件的一些信息推送给用户。
JAVA中,有一个开源软件,JavaPNS实现了Java平台中连接苹果服务器与推送消息的服务。但是在使用的过程中,有两点需要使用者注意一下,希望后续使用的同志们能避免我走过的覆辙。
1、一是向苹果的服务推送消息时,如果遇到无效的deviceToken,苹果会断开网络连接,而JavaPNS不会进行重连。苹果原文:
    If you send a notification and APNs finds the notification malformed or otherwise unintelligible, it returns an error-response packet prior to disconnecting. (If there is no error, APNs doesn’t return anything.) Figure 5-3 depicts the format of the error-response packet.
2、JavaPNS是一条条发送通知的,但是对于大规模发送的生产环境,显然是不可以的,建议使用批量发送。苹果原文:
The binary interface employs a plain TCP socket for binary content that is streaming in nature. For optimum performance, you should batch multiple notifications in a single transmission over the interface, either explicitly or using a TCP/IP Nagle algorithm.

对于此,我对JavaAPNS的代码进行了改动,使其支持批量发送和苹果断开重连,但是有一个问题需要大家注意一下,在正常发送的情况下,苹果是不会向Socket中写任何数据的,需要等待其读超时,this.socket.getInputStream().read(),确订推送结果的正常。通过持续的向Socket中写数据,实现批量发送,调用flush方法时,完成一次批量发送。在PushNotificationManager增加如下方法:
public List<ResponsePacket> sendNotification(List<PushedNotification> pnl) {		logger.info(psn + "RR批量推送时消息体的大小为:" + pnl.size());		List<ResponsePacket> failList = new ArrayList<ResponsePacket>();		if (pnl.size() == 0) {			return failList;		}		Set<Integer> sendSet = new HashSet<Integer>();		int counter = 0;		while (counter < pnl.size()) {			try {				this.socket.setSoTimeout(3000);				this.socket.setSendBufferSize(25600);				this.socket.setReceiveBufferSize(600);				for (; counter < pnl.size(); counter++) {					PushedNotification push = pnl.get(counter);					if (sendSet.contains(push.getIdentifier())) {						logger.warn("信息[" + push.getIdentifier() + "]已经被推送");						continue;					}					byte[] bytes = getMessage(push.getDevice().getToken(), push.getPayload(), push.getIdentifier(), push);					this.socket.getOutputStream().write(bytes);					// 考虑到重发的问题					// sendSet.add(push.getIdentifier());				}				this.socket.getOutputStream().flush();				// 等待回馈数据,比单个发送时延时长一点,否则将无法获取到回馈数据				this.socket.setSoTimeout(1000);				StringBuffer allResult = new StringBuffer();				ResponsePacket rp = new ResponsePacket();				int readCounter = 0;				// 处理读回写数据的异常				try {					logger.info(psn + "检查流数据是否可用:" + this.socket.getInputStream().available());					byte[] sid = new byte[4];// 发送标记					while (true) {						int value = this.socket.getInputStream().read();						if (value < 0) {							break;						}						readCounter++;						if (readCounter == 1) {							rp.setCommand(value);						}						if (readCounter == 2) {							rp.setStatus(value);						}						if (readCounter >= 3 && readCounter <= 6) {							sid[readCounter - 3] = (byte) value;							if (readCounter == 6) {								rp.setIdentifier(ByteBuffer.wrap(sid).getInt());								if (failList.contains(rp)) {									logger.error("错误返馈数据中已经包含当前数据," + rp.getIdentifier());								}								failList.add(rp);							}						}						allResult.append(value + "_");					}					this.socket.getInputStream().close();				} catch (SocketTimeoutException ste) {					logger.debug(psn + "消息推送成功,无任何返回!", ste);				} catch (IOException e) {					logger.debug(psn + "消息推送成功,关闭连接流时出错!", e);				}				logger.info("苹果返回的数据为:" + allResult.toString());				if (readCounter >= 6) {					// 找到出错的地方					for (int i = 0; i < pnl.size(); i++) {						PushedNotification push = pnl.get(i);						if (push.getIdentifier() == rp.getIdentifier()) {							counter = i + 1;							break;							// 从出错的地方再次发送,						}					}					try {						this.createNewSocket();					} catch (Exception e) {						logger.warn("连接时出错,", e);					}				}			} catch (SSLHandshakeException she) {				// 握手出错,标记不加				logger.warn("SHE消息推送时出错,", she);				try {					this.createNewSocket();				} catch (Exception e) {					logger.warn("连接时出错,", e);				}			} catch (SocketException se) {				logger.warn("SE消息推送时出错", se);				counter++;				try {					this.createNewSocket();				} catch (Exception e) {					logger.warn("连接时出错,", e);				}			} catch (IOException e) {				logger.warn("IE消息推送时出错", e);				counter++;			} catch (Exception e) {				logger.warn("E消息推送时出错", e);				counter++;			}			if (counter >= pnl.size()) {				break;			}		}		return failList;	}

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