LightWeightRunLoop

Implement iOS/Mac NSRunLoop and some Runloop-Relative Fundation API such as perform selector(or delay some times) on other thread , Timer, URLConnection, LWStream(LWInputStream、LWOutputStream), LWPort(LWSocketPort)etc..

IO Event-Driver-Model

Main Features

• NSObject - postSelector:onThread:withObject:afterDelay:modes (equal to NSObject performSelector: withObject:afterDelay:inModes:)etc.

• LWTimer - NSTimer, nanosecond

• LWURLConnection - NSURLConnection

• LWInputStream - File relative Stream

• LWOutputStream - File relative Stream

• LWPort - LWSocketPort(Leader-Follower pattern socket)

Future Features & To-Do

• Refactor project

Get Started

Each NSThread object, excluding the application’s main thread, can own an LWRunLoop object. You can get the current thread’s LWRunLoop, through the class method currentLWRunLoop. Subsequently code snippet shows how configure LWRunLoop for NSThread and make the NSThread _lwRunLoopThread entering into Event-Driver-Mode:

 NSThread *_lwRunLoopThread = [[NSThread alloc] initWithTarget:self selector:@selector(lightWeightRunloopThreadEntryPoint:) object:nil];
    - (void)lightWeightRunloopThreadEntryPoint:(id)data {
@autoreleasepool {
    LWRunLoop *looper = [LWRunLoop currentLWRunLoop];
    [looper run];
    
    //or
    [[LWRunLoop currentLWRunLoop] run];
    }
}

To enqueue a selector to be performed on a different thread than your own && schedule a selector to be executed at some point in the future

you can use the category of NSObject(post)

• -(void)postSelector:(SEL)aSelector onThread:(NSThread *)thread withObject:(id)arg;

• -(void)postSelector:(SEL)aSelector onThread:(NSThread *)thread withObject:(id)arg afterDelay:(NSInteger)delay

• -(void)postSelector:(SEL)aSelector onThread:(NSThread *)thread withObject:(id)arg afterDelay:(NSInteger)delay modes:(NSArray<NSString *> modes)

lwrunloop modes are:

NSString * const  LWDefaultRunLoop = @"LWDefaultRunLoop";
NSString * const  LWRunLoopCommonModes = @"LWRunLoopCommonModes";
NSString * const  LWRunLoopModeReserve1 = @"LWRunLoopModeReserve1";
NSString * const  LWRunLoopModeReserve2 = @"LWRunLoopModeReserve2";
NSString * const  LWTrackingRunLoopMode = @"LWTrackingRunLoopMode";

you can switch runloop mode at any time you can like this:

	    LWRunLoop *runLoop = [_lwModeRunLoopThread looper];
        [runLoop changeRunLoopMode:LWRunLoopModeReserve2];

you can use the category of NSObject(post):

  [self postSelector:@selector(execute) onThread:_lwRunLoopThread withObject:nil];
  [self postSelector:@selector(execute) onThread:_lwRunLoopThread withObject:nil afterDelay:5000];
  [self postSelector:@selector(execute) onThread:_lwRunLoopThread withObject:nil afterDelay:5000 modes:@[LWDefaultRunLoop]];

You use the LWTimer class to create timer objects or, more simply, timers.

A timer waits until a certain time interval has elapsed and then fires, sending a specified message to a target object.

• +(LWTimer *)scheduledLWTimerWithTimeInterval:(NSTimeInterval)interval target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;

• +(LWTimer *)timerWithTimeInterval:(NSTimeInterval)interval target:(id)aTarget selector:( SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;

fire the LWTimer using - (void)fire and invalidate the LWTimer using - (void)invalidate

For example:

run the - (void)genernateLWTimer on _lwRunLoopThread:

[self postSelector:@selector(genernateLWTimer) onThread:_lwRunLoopThread withObject:nil];

- (void)genernateLWTimer
{
    _count = 0;
    LWTimer *timer = [LWTimer timerWithTimeInterval:1000 target:self selector:@selector(bindLWTimerWithSelector:) userInfo:nil repeats:YES];
[timer fire];
   //gTimer = [LWTimer scheduledLWTimerWithTimeInterval:2000 target:self selector:@selector(bindLWTimerWithSelector:) userInfo:nil repeats:YES];
}

the selector for LWTimer to be executed:

- (void)bindLWTimerWithSelector:(LWTimer *)timer
{
    _count++;
    NSLog(@"* [ LWTimer : %@ performSelector: ( %@ ) on Thread : %@ ] *", [self class], NSStringFromSelector(_cmd), [NSThread currentThread].name);
    if (_count == 4) {
        [timer invalidate];
    }
}   

An LWURLConnection object lets you load the contents of a URL by providing a URL request object.

Step1: Perform LWURLConnection on _lwRunLoopThread:

- (void)executeURLConnection:(UIButton *)button
{
   [self postSelector:@selector(performURLConnectionOnRunLoopThread) onThread:_lwRunLoopThread withObject:nil];
}

Step2: Create LWURLConnection, schedule LWURLConnection to _lwRunLoopThread such as following code snippet:

- (void)performURLConnectionOnRunLoopThread
{
    NSLog(@"[%@ %@]", [self class], NSStringFromSelector(_cmd));
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.8:8888/post.php"]];
   request.HTTPMethod = @"POST";
   NSString *content = @"name=john&address=beijing&mobile=140005";
   request.HTTPBody = [content dataUsingEncoding:NSUTF8StringEncoding];
   LWURLConnection *conn = [[LWURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
   [conn scheduleInRunLoop:_lwRunLoopThread.looper];
   [conn start];
}

Step3: Implement the delegate methods on Receiver:

@protocol LWURLConnectionDataDelegate <NSObject>

- (void)lw_connection:(LWURLConnection * _Nonnull)connection didReceiveData:(NSData * _Nullable)data;
- (void)lw_connection:(LWURLConnection * _Nonnull)connection didFailWithError:(NSError * _Nullable)error;
- (void)lw_connectionDidFinishLoading:(LWURLConnection * _Nonnull)connection;
@end

Step4: You can use LWURLResponse to format Http response

LWURLResponse *response = [[LWURLResponse alloc] initWithData:_responseData];

LWInputStream & LWOutputStream (File Relative)

Initilize LWInputStream or LWOutputStream :

	  _lwInputStream = [LWInputStream inputStreamWithFileAtPath:filePath];
	  _lwInputStream.delegate = self;
	  [_lwInputStream scheduleInRunLoop:[_thread looper] forMode:LWDefaultRunLoop];
	  [_lwInputStream open];

or

      _lwOutputStream = [LWOutputStream outputStreamToFileAtPath:filePath append:YES];
	  _lwOutputStream.delegate = self;
      [_lwOutputStream scheduleInRunLoop:[_thread looper] forMode:LWDefaultRunLoop];
      [_lwOutputStream open];

Then read or write data on the selector of delegate,such as:

 switch (eventCode) {
        case LWStreamEventOpenCompleted:
             break;
        case LWStreamEventHasBytesAvailable:
        {
            uint8_t buffer[1];
            NSUInteger len = [(LWInputStream *)aStream read:buffer maxLength:sizeof(buffer)];
            [_inputStreamData appendBytes:buffer length:len];
        }
            break;
        case LWStreamEventEndEncountered:
        {
            NSString *content = [[NSString alloc] initWithData:_inputStreamData encoding:NSUTF8StringEncoding];
            NSLog(@"content = %@", content);
            [(LWInputStream *)aStream close];
        }
            break;
        default:
            break;
    }

or

switch (eventCode) {
        case LWStreamEventOpenCompleted:
            break;
        case LWStreamEventHasSpaceAvailable:
        {
            uint8_t buffer[50] = "abcdefghijklmnopqrstuvwxyz";
            NSUInteger len = [(LWOutputStream *)aStream write:buffer maxLength:50];
            [_inputStreamData appendBytes:buffer length:len];
            [(LWOutputStream *)aStream close];
        }
            break;
        case LWStreamEventEndEncountered:
        {
        }
            break;

LWPort & LWSocketPort (Socket Relative)

current the message should be :

[data length] + [data]

for example(the data hello length is 5):

5hello

Initilize _lwPortRunLoopThread :

_lwPortRunLoopThread = [[NSThread alloc] initWithTarget:self selector:@selector(portThreadEntryPoint:) object:nil];
_lwPortRunLoopThread.name = @"lwPortLoopThread";
[_lwPortRunLoopThread start];

provide portThreadEntryPoint:

- (void)portThreadEntryPoint:(id)data
{
    @autoreleasepool {
        LWRunLoop *looper = [LWRunLoop currentLWRunLoop];
        _leaderPort = [[LWSocketPort alloc] initWithTCPPort:8082];
        _leaderPort.delegate = self;
        _worker = [[WorkerClass alloc] init];
        [looper addPort:_leaderPort forMode:LWDefaultRunLoop];
        [looper runMode:LWDefaultRunLoop];
    }
}

Send message from leader to followers :

	-(void)performFollowerToLeader:(UIButton *)button
	{
	    [NSThread detachNewThreadSelector:@selector(launchThreadWithPort:) toTarget:_worker withObject:_leaderPort];
	}

send message from followers to leader:

	- (void)performLeaderToFollower:(UIButton *)buttton
	{
	    // wake up _lwPortRunLoopThread and send data from leader to follower
	    [self postSelector:@selector(actualPerfomLeaderToFolloer) onThread:_lwPortRunLoopThread withObject:nil];
	}
	- (void)actualPerfomLeaderToFolloer
	{
	    NSString *content = @"This_Is_A_Leader_To_Follower_Message_Data";
	    int length = (int)[content length];
	    NSMutableData *data = [[NSMutableData alloc] init];
	    [data appendBytes:&length length:sizeof(int)];
	    [data appendData:[content dataUsingEncoding:NSUTF8StringEncoding]];
	    LWPortMessage *messge = [[LWPortMessage alloc] initWithSendPort:_leaderPort receivePort:_worker.localPort components:data];
	    [messge sendBeforeDate:0];
	}

the worker should like:

	- (void)launchThreadWithPort:(LWPort *)port
	{
	    @autoreleasepool {
	        [self send:port];
	    }
	}
	- (void)send:(LWPort *)port
	{
		    [NSThread currentThread].name = @"workerPortLoopThread";
		    _distantPort = (LWSocketPort *)port;
		    _localPort = [[LWSocketPort alloc] initWithTCPPort:8082];
		    _localPort.delegate = self;
		    [_localPort setType:LWSocketPortRoleTypeFollower];
		    NSString *content = @"This_Is_A_Follower_To_Leader_Message_Data";
		    int length = (int)[content length];
		    NSMutableData *data = [[NSMutableData alloc] init];
		    [data appendBytes:&length length:sizeof(int)];
		    [data appendData:[content dataUsingEncoding:NSUTF8StringEncoding]];
		    LWPortMessage *messge = [[LWPortMessage alloc] initWithSendPort:_localPort receivePort:_distantPort components:data];
		    [messge sendBeforeDate:0];
		    LWRunLoop *_currentRunLoop = [[NSThread currentThread] looper];
		    [_currentRunLoop addPort:_localPort forMode:LWDefaultRunLoop];
		    [_currentRunLoop runMode:LWDefaultRunLoop];
	}

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