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TCP/TCPWriter.m
author Jens Alfke <jens@mooseyard.com>
Fri Jul 24 14:06:28 2009 -0700 (2009-07-24)
changeset 63 5e4855a592ee
parent 7 5936db2c1987
permissions -rw-r--r--
* The BLIPConnection receivedRequest: delegate method now returns BOOL. If the method returns NO (or if the method isn't implemented in the delegate), that means it didn't handle the message at all; an error will be returned to the sender.
* If the connection closes unexpectedly due to an error, then the auto-generated responses to pending requests will contain that error. This makes it easier to display a meaningful error message in the handler for the request. 
     1 //

     2 //  TCPWriter.m

     3 //  MYNetwork

     4 //

     5 //  Created by Jens Alfke on 5/10/08.

     6 //  Copyright 2008 Jens Alfke. All rights reserved.

     7 //

     8 

     9 #import "TCPWriter.h"

    10 #import "TCP_Internal.h"

    11 

    12 #import "Logging.h"

    13 #import "Test.h"

    14 

    15 

    16 @implementation TCPWriter

    17 

    18 

    19 - (void) dealloc

    20 {

    21     [_queue release];

    22     [_currentData release];

    23     [super dealloc];

    24 }

    25 

    26 

    27 - (TCPReader*) reader

    28 {

    29     return _conn.reader;

    30 }

    31 

    32 

    33 - (BOOL) isBusy

    34 {

    35     return _currentData || _queue.count > 0;

    36 }

    37 

    38 

    39 - (void) writeData: (NSData*)data

    40 {

    41     if( !_queue )

    42         _queue = [[NSMutableArray alloc] init];

    43     [_queue addObject: data];

    44     if( _queue.count==1 && ((NSOutputStream*)_stream).hasSpaceAvailable )

    45         [self _canWrite];

    46 }

    47 

    48 

    49 - (void) _canWrite

    50 {

    51     if( ! _currentData ) {

    52         if( _queue.count==0 ) {

    53             [self queueIsEmpty]; // this may call -writeData, which will call _canWrite again

    54             return;

    55         }

    56         _currentData = [[_queue objectAtIndex: 0] retain];

    57         _currentDataPos = 0;

    58         LogTo(TCPVerbose,@"%@ using _currentData %p (%u bytes)", self,_currentData,_currentData.length);

    59         [_queue removeObjectAtIndex: 0];

    60     }

    61     

    62     const uint8_t* src = _currentData.bytes;

    63     src += _currentDataPos;

    64     NSInteger len = _currentData.length - _currentDataPos;

    65     NSInteger written = [(NSOutputStream*)_stream write: src maxLength: len];

    66     if( written < 0 )

    67         [self _gotError];

    68     else if( written < len ) {

    69         LogTo(TCPVerbose,@"%@ wrote %i bytes (of %u) from %p", self,written,len,_currentData);

    70         _currentDataPos += written;

    71     } else {

    72         LogTo(TCPVerbose,@"%@ wrote %i bytes, released %p", self,written,_currentData);

    73         setObj(&_currentData,nil);

    74     }

    75 }

    76 

    77 

    78 - (void) queueIsEmpty

    79 {

    80 }

    81 

    82 

    83 @end

    84 

    85 

    86 /*

    87  Copyright (c) 2008, Jens Alfke <jens@mooseyard.com>. All rights reserved.

    88  

    89  Redistribution and use in source and binary forms, with or without modification, are permitted

    90  provided that the following conditions are met:

    91  

    92  * Redistributions of source code must retain the above copyright notice, this list of conditions

    93  and the following disclaimer.

    94  * Redistributions in binary form must reproduce the above copyright notice, this list of conditions

    95  and the following disclaimer in the documentation and/or other materials provided with the

    96  distribution.

    97  

    98  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR

    99  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 

   100  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-

   101  BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

   102  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 

   103   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

   104  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 

   105  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   106  */
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