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优化录像清单获取算法

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This commit is contained in:
Lawrence 2021-01-11 20:39:27 +08:00
parent f84b6125c8
commit d4ead3870d
1 changed files with 14 additions and 23 deletions
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37
src/main/java/com/genersoft/iot/vmp/gb28181/transmit/request/impl/MessageRequestProcessor.java
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@ -342,6 +342,7 @@ public class MessageRequestProcessor extends SIPRequestAbstractProcessor {
try {
// 回复200 OK
responseAck(evt);
String seqNo = String.valueOf(System.currentTimeMillis());
RecordInfo recordInfo = new RecordInfo();
Element rootElement = getRootElement(evt);
Element deviceIdElement = rootElement.element("DeviceID");
@ -396,32 +397,22 @@ public class MessageRequestProcessor extends SIPRequestAbstractProcessor {
if (recordInfo.getSumNum() > 0 && recordList.size() > 0 && recordList.size() < recordInfo.getSumNum()) {
// 为防止连续请求该设备的录像数据，返回数据错乱，特增加sn进行区分
String cacheKey = CACHE_RECORDINFO_KEY + deviceId + sn;
// TODO 暂时直接操作redis存储，后续封装专用缓存接口，改为本地内存缓存
if (redis.hasKey(cacheKey)) {
List<RecordItem> previousList = (List<RecordItem>) redis.get(cacheKey);
if (previousList != null && previousList.size() > 0) {
recordList.addAll(previousList);
}
// 本分支表示录像列表被拆包，且加上之前的数据还是不够,保存缓存返回，等待下个包再处理
if (recordList.size() < recordInfo.getSumNum()) {
logger.info("已获取" + recordList.size() + "项录像数据，共" + recordInfo.getSumNum() + "项");
redis.set(cacheKey, recordList, 90);
return;
} else {
// 本分支表示录像被拆包，但加上之前的数据够足够，返回响应
// 因设备心跳有监听redis过期机制，为提高性能，此处手动删除
logger.info("录像数据已全部获取");
redis.del(cacheKey);
}
} else {
// 本分支有两种可能：1、录像列表被拆包，且是第一个包,直接保存缓存返回，等待下个包再处理
// 2、之前有包，但超时清空了，那么这次sn批次的响应数据已经不完整，等待过期时间后redis自动清空数据
logger.info("已获取" + recordList.size() + "项录像数据，共" + recordInfo.getSumNum() + "项");
logger.info("等待后续的包...");
redis.set(cacheKey, recordList, 90);
redis.set(cacheKey + "_" + seqNo, recordList, 90);
List<Object> cacheKeys = redis.scan(cacheKey + "_*");
List<RecordItem> totalRecordList = new ArrayList<RecordItem>();
for (int i = 0; i < cacheKeys.size(); i++) {
totalRecordList.addAll((List<RecordItem>) redis.get(cacheKeys.get(i).toString()));
}
if (totalRecordList.size() < recordInfo.getSumNum()) {
logger.info("已获取" + totalRecordList.size() + "项录像数据，共" + recordInfo.getSumNum() + "项");
return;
}
logger.info("录像数据已全部获取，共" + recordInfo.getSumNum() + "项");
recordInfo.setRecordList(totalRecordList);
for (int i = 0; i < cacheKeys.size(); i++) {
redis.del(cacheKeys.get(i).toString());
}
}
// 自然顺序排序, 元素进行升序排列
recordInfo.getRecordList().sort(Comparator.naturalOrder());