public async Task <MessageResult> GetMessageAsyncLite(
GetMessageRequest request,
Delegate_outputMessage proc,
TimeSpan timeout,
CancellationToken token)
{
MessageResult result = new MessageResult();
if (string.IsNullOrEmpty(request.TaskID) == true)
{
request.TaskID = Guid.NewGuid().ToString();
}
long recieved = 0;
StringBuilder cache = new StringBuilder();
using (WaitEvents wait_events = new WaitEvents()) // 表示中途数据到来
{
using (var handler = HubProxy.On <
string, long, long, IList <MessageRecord>, string, string>(
"responseGetMessage",
(taskID, resultCount, start, records, errorInfo, errorCode) =>
{
if (taskID != request.TaskID)
{
return;
}
if (resultCount == -1 || start == -1)
{
if (start == -1)
{
// 表示发送响应过程已经结束。只是起到通知的作用，不携带任何信息
// result.Finished = true;
}
else
{
result.Value = resultCount;
result.ErrorInfo = errorInfo;
result.String = errorCode;
}
wait_events.finish_event.Set();
return;
}
proc(
cache,
resultCount,
start,
records,
errorInfo,
errorCode);
if (records != null)
{
recieved += GetCount(records); // records.Count;
}
if (errorCode == "_complete")
{
result.Value = resultCount;
wait_events.finish_event.Set();
return;
}
if (resultCount >= 0 &&
IsComplete(request.Start, request.Count, resultCount, recieved) == true)
{
wait_events.finish_event.Set();
}
else
{
wait_events.active_event.Set();
}
}))
{
MessageResult temp = await HubProxy.Invoke <MessageResult>(
"RequestGetMessage",
request).ConfigureAwait(false);
if (temp.Value == -1 || temp.Value == 0 || temp.Value == 2)
{
return(temp);
}
// result.String 里面是返回的 taskID
await WaitAsync(
request.TaskID,
wait_events,
timeout,
token).ConfigureAwait(false);
return(result);
}
}
}
// parameters:
// field 字段名。例如 groups/subjects
public async Task GetFieldAggregate(
string field,
GroupQuery group_query,
string userCondition,
string timeRange,
string idCondition,
string subjectCondition,
int start,
int count,
Delegate_outputMessage proc)
{
IMongoCollection <MessageItem> collection = this._collection;
FilterDefinition <MessageItem> filter = BuildQuery(// groupName,
group_query,
userCondition,
timeRange,
idCondition,
subjectCondition);
#if NO
var group = new BsonDocument {
{ "$group",
new BsonDocument
{
{ "_id", new BsonDocument
{
{
"MyUser", "$subject"
}
} },
{
"Count", new BsonDocument
{
{
"$sum", 1
}
}
}
} }
};
#endif
var myresults = await collection.Aggregate().Match(filter)
//.Group(new BsonDocument("_id", "$subjects"))
.Group(
new BsonDocument
{
{ "_id", "$" + field },
{
"c", new BsonDocument
{
{
"$sum", 1
}
}
}
}
)
.ToListAsync().ConfigureAwait(false);
long totalCount = myresults.Count;
var index = 0;
foreach (BsonDocument doc in myresults)
{
if (count != -1 && index - start >= count)
{
break;
}
Type type = null;
if (index >= start)
{
MessageItem item = new MessageItem();
// BsonArray array = (doc.GetValue("_id") as BsonArray);
if (type == null)
{
type = item.GetPropertyType(field);
}
BsonValue temp = doc.GetValue("_id");
if (type.Equals(typeof(string[])))
{
item.SetPropertyValue(field, GetStringArray(temp as BsonArray));
}
else if (type.Equals(typeof(List <string>))) // 2018/11/14
{
item.SetPropertyValue(field, new List <string>(GetStringArray(temp as BsonArray)));
}
else
{
item.SetPropertyValue(field, temp.ToString());
}
item.data = doc.GetValue("c").ToString();
if (proc(totalCount, item) == false)
{
return;
}
}
index++;
}
proc(totalCount, null); // 表示结束
}
// 检索出指定范围的 群名类型
public async Task GetGroups(
GroupQuery group_query,
string timeRange,
int start,
int count,
Delegate_outputMessage proc)
{
IMongoCollection <MessageItem> collection = this._collection;
// List<MessageItem> results = new List<MessageItem>();
FilterDefinition <MessageItem> filter = BuildQuery(// groupName,
group_query,
timeRange);
var results = await collection
.Find(
filter == null?new BsonDocument() : filter
)
.Project(Builders <MessageItem> .Projection.Include("groups")).ToListAsync();
List <string> keys = new List <string>();
Hashtable table = new Hashtable(); // groups --> true
foreach (BsonDocument doc in results)
{
string strText = ToString(doc.GetValue("groups") as BsonArray);
if (strText == null)
{
continue;
}
if (table.ContainsKey(strText))
{
continue;
}
table[strText] = true;
keys.Add(strText);
}
long totalCount = keys.Count;
foreach (string key in keys)
{
MessageItem item = new MessageItem();
item.groups = key.Split(new char [] { ',' });
// var groups = doc.GetValue("_id");
if (proc(totalCount, item) == false)
{
return;
}
}
proc(totalCount, null); // 表示结束
#if NO
var myresults = await collection.Aggregate()
.Group(new BsonDocument("_id", "$groups"))
.ToListAsync();
long totalCount = myresults.Count;
foreach (BsonDocument doc in myresults)
{
MessageItem item = new MessageItem();
BsonArray array = (doc.GetValue("_id") as BsonArray);
item.groups = GetStringArray(array);
// var groups = doc.GetValue("_id");
if (proc(totalCount, item) == false)
{
return;
}
}
proc(totalCount, null); // 表示结束
#endif
}
// 这个版本资源耗费厉害
// 按照条件检索出 MessageItem 中的 group 字段，并归并去重
// 相当于 Group by 的效果
public async Task GetGroupsField(
GroupQuery group_query,
string timeRange,
int start,
int count,
Delegate_outputMessage proc)
{
IMongoCollection <MessageItem> collection = this._collection;
// List<MessageItem> results = new List<MessageItem>();
FilterDefinition <MessageItem> filter = BuildQuery(// groupName,
group_query,
"",
timeRange,
"",
"");
// 在遍历过程中，只接收 groups 字段
// http://stackoverflow.com/questions/32938656/c-sharp-mongo-2-0-reduce-traffic-of-findasync
var projection = Builders <MessageItem> .Projection
.Include(b => b.groups)
.Exclude("_id"); // _id is special and needs to be explicitly excluded if not needed
var options = new FindOptions <MessageItem, MessageItem> {
Projection = projection
};
List <string> keys = new List <string>();
Hashtable table = new Hashtable(); // groups --> true
using (var cursor = await collection.FindAsync(filter, options).ConfigureAwait(false))
{
while (await cursor.MoveNextAsync().ConfigureAwait(false))
{
var batch = cursor.Current;
foreach (var document in batch)
{
if (document.groups == null)
{
continue;
}
string strText = string.Join(",", document.groups);
if (table.ContainsKey(strText))
{
continue;
}
table[strText] = true;
keys.Add(strText);
}
}
}
long totalCount = keys.Count;
var index = 0;
foreach (string key in keys)
{
if (count != -1 && index - start >= count)
{
break;
}
if (index >= start)
{
MessageItem item = new MessageItem();
#if ARRAY
item.groups = key.Split(new char[] { ',' });
#else
item.groups = new List <string>(key.Split(new char[] { ',' }));
#endif
if (proc(totalCount, item) == false)
{
return;
}
}
index++;
}
proc(totalCount, null); // 表示结束
}
// parameters:
// timeRange 时间范围
public async Task GetMessages(// string groupName,
GroupQuery group_query,
string userCondition,
string timeRange,
string sortCondition,
string idCondition,
string subjectCondition,
int start,
int count,
Delegate_outputMessage proc)
{
IMongoCollection <MessageItem> collection = this._collection;
// List<MessageItem> results = new List<MessageItem>();
FilterDefinition <MessageItem> filter = BuildQuery(// groupName,
group_query,
userCondition,
timeRange,
idCondition,
subjectCondition);
#if NO
if (string.IsNullOrEmpty(groupName))
{
filter = Builders <MessageItem> .Filter.Or(
Builders <MessageItem> .Filter.Eq("group", ""),
Builders <MessageItem> .Filter.Eq("group", (string)null));
}
else
#endif
// filter = Builders<MessageItem>.Filter.Eq("group", groupName);
SortDefinition <MessageItem> sort = null;
if (string.IsNullOrEmpty(sortCondition))
{
sort = Builders <MessageItem> .Sort.Ascending("publishTime");
}
else
{
List <string> sort_params = StringUtil.ParseTwoPart(sortCondition, "|");
string field_name = sort_params[0];
// TODO: 需要检查一下 field_name 内容的正确性
string order_part = sort_params[1];
if (string.IsNullOrEmpty(order_part) ||
order_part == "ascending" ||
order_part == "asc")
{
sort = Builders <MessageItem> .Sort.Ascending(field_name);
}
else
{
sort = Builders <MessageItem> .Sort.Descending(field_name);
}
}
var options = new FindOptions <MessageItem, MessageItem> {
Sort = sort
};
long totalCount = 0;
var index = 0;
using (var cursor = await collection.FindAsync(
filter == null ? new BsonDocument() : filter
, options).ConfigureAwait(false))
{
while (await cursor.MoveNextAsync().ConfigureAwait(false))
{
var batch = cursor.Current;
int batch_count = batch.Count <MessageItem>();
Console.WriteLine("batch.Count=" + totalCount);
foreach (var document in batch)
{
if (count != -1 && index - start >= count)
{
break;
}
if (index >= start)
{
if (proc(-2, document) == false) // -2 表示总记录数暂时未知。发送全部结束的时候会单独一次发出总记录数
{
return;
}
}
index++;
}
totalCount += batch_count;
}
proc(totalCount, null); // 表示结束
}
}
