1.download map.put(id,task) && map.get(id); id from database.JS MAP “{}”;check if exist!
2.create a database,id—downloadTask.
Step:
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Create database when init,Create a map in JS .
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Create download object,then store it to map which can be getted from rd.downloader (JS Engine) and store it to database.Last return the object through getting object from map.
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When execute callback function,get object from map,then set properties of the object,and the same time store it to database.Then execute callback.
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When enumerate downloads,get downloads from database,if the js map does not contain download,then store it.
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When clear downloads,clear local map, clear map and clear database,
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GetTaskById a new API.First get task from js map. Get task through database,then store it to js map if js map does not contain it //wait to modify!
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Background Configuration
Proplem:
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getTask I think getTask from map collection first,if not,from database
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about enumerate, from database;
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getTaskById,need to modify,it should be object,not just json simply!
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restrict the speed of download，kb/s(限速 )! setSpeed!
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remember add a column plugin.m_id!(do not do that,plugin.m_id is used in runtime.Create a download task,then get plugin.m_id)
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get object from collection,not create a new one
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In system callback function,download tasks are from local collection!Not sure if turn to JS MAP.
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How to judge object is nil in JS in IOS?
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about m_id ,in runtime map?
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enumerate and startAll store download task from database!
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JS MAP does not equal the local array?why?
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Why use a database to store download?
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getTaskById if the local array does not contain m_id,then create a new download ,then modify the properties of download.
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Enumerate,enumerate from database,then enumerate the local array to check if the m_id of download exist in the local array,If not ,create a new download!
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StartAll,start all the tasks from local array?
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How the JS Map bind the local array?
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store resume data to a file where in sandbox!
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According URL to check where to store the info to id（taskDescription store id from database,then get the id to store info）
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When you create a new one ,then start, sometimes it will crash.
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getTaskById first time return NULL,second time return a task! *****
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getTaskById and enumerate use a common method which will do get task from JS Map first,then local array,last database.
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remove task,remove each JS MAP of web view.
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downloadTaskID from 1. getMaxID!
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Above 9,can resume task directly,create a new one,then resume.In 8.0 ,move file to TMP,in 7.0,setting the correct path to key.
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CreateDownload URL and Path same,
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插入数据失败: column dradeId is not unique
Complete:
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same task.Test in callback function
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database store the download info.
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getTaskById need to write int RDUnility.m
Test:
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First ,createDownload. Create a download,JS Map add a new download,Database add a new one.
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Enumerate func:Enumerate from database,the same time,JS MAP contain download tasks.
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StartAll how to define all?From database,or JS MAP,or local collection?
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Clear func:Clear local,clear JS MAP,clear database.
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Remove : remove local,JS MAP,database
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getTaskById:First from JS MAP,If not exist,get from database,then store it to JS MAP.
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When download start,pause,resume and so on,the download in JS MAP change,database change too!
//Check if the resumeData is valid to use
//The data argument is passed by the method as below
//-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)downloadCompletedTask didCompleteWithError:(NSError *)error
- (NSData *)turnValidResumeData:(NSData *)data
{
if (!data || [data length] < 1) return nil;
NSError *error;
NSDictionary *resumeDictionary = [NSPropertyListSerialization propertyListWithData:data options:NSPropertyListMutableContainers format:NULL error:&error];
if (!resumeDictionary || error) return nil;
NSString *localTmpFilePath;
int download_version = [[resumeDictionary objectForKey:@"NSURLSessionResumeInfoVersion"] intValue];
if(download_version==1)
{
localTmpFilePath = [resumeDictionary objectForKey:@"NSURLSessionResumeInfoLocalPath"];
if ([localTmpFilePath length] < 1) return nil;
}
else if(download_version==2)
{
localTmpFilePath = [resumeDictionary objectForKey:@"NSURLSessionResumeInfoTempFileName"];
if ([localTmpFilePath length] < 1) return nil;
}
NSString *localCachePath;
NSString *localLastName = [localTmpFilePath lastPathComponent];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if(version>=9.0)
{
return data;
}
else if(version>=8.0&&version<9.0)
{
NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];
NSString * _localCachePath = [[[cachesDir stringByAppendingPathComponent:@"com.apple.nsurlsessiond/Downloads"]stringByAppendingPathComponent:bundleIdentifier]stringByAppendingPathComponent:localLastName];
if([[NSFileManager defaultManager] fileExistsAtPath:_localCachePath])
localCachePath = _localCachePath;
NSString *temp = NSTemporaryDirectory();
temp = [temp stringByAppendingPathComponent:localLastName];
if([[NSFileManager defaultManager] fileExistsAtPath:temp])
localCachePath = localLastName;
}
else
{
localCachePath = [[cachesDir stringByAppendingPathComponent:@"com.apple.nsnetworkd"]stringByAppendingPathComponent:localLastName];
}
[resumeDictionary setValue:localCachePath forKey:@"NSURLSessionResumeInfoLocalPath"];
data = [NSPropertyListSerialization dataWithPropertyList:resumeDictionary format:NSPropertyListXMLFormat_v1_0 options:0 error:NULL];
return data;
}
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