Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 305 lines (273 sloc) 7.566 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
/*
* CPOperationQueue.j
*
* Created by Johannes Fahrenkrug.
* Copyright 2009, Springenwerk.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

@import "CPArray.j"
@import "CPFunctionOperation.j"
@import "CPInvocationOperation.j"
@import "CPObject.j"
@import "CPOperation.j"
@import "CPString.j"
@import "CPTimer.j"

// the global queue (mainQueue)
var cpOperationMainQueue = nil;

/*!
@class CPOperationQueue
@brief Represents an operation queue that can run CPOperations
*/
@implementation CPOperationQueue : CPObject
{
    CPArray _operations;
    BOOL _suspended;
    CPString _name @accessors(property=name);
    CPTimer _timer;
}

- (id)init
{
    self = [super init];

    if (self)
    {
        _operations = [[CPArray alloc] init];
        _suspended = NO;
        _currentlyModifyingOps = NO;
        _timer = [CPTimer scheduledTimerWithTimeInterval:0.01
                                                  target:self
                                                selector:@selector(_runNextOpsInQueue)
                                                userInfo:nil
                                                 repeats:YES];
    }
    return self;
}

- (void)_runNextOpsInQueue
{
    if (!_suspended && [self operationCount] > 0)
    {
        var i = 0,
            count = [_operations count];

        for (; i < count; i++)
        {
            var op = [_operations objectAtIndex:i];
            if ([op isReady] && ![op isCancelled] && ![op isFinished] && ![op isExecuting])
            {
                [op start];
            }
        }
    }
}

- (void)_enableTimer:(BOOL)enable
{
    if (!enable)
    {
        if (_timer)
        {
            [_timer invalidate];
            _timer = nil;
        }
    }
    else
    {
        if (!_timer)
        {
            _timer = [CPTimer scheduledTimerWithTimeInterval:0.01
                                                      target:self
                                                    selector:@selector(_runNextOpsInQueue)
                                                    userInfo:nil
                                                     repeats:YES];
        }
    }
}

/*!
Adds the specified operation object to the receiver.
@param anOperation the operation that should be scheduled for execution
*/
- (void)addOperation:(CPOperation)anOperation
{
    [self willChangeValueForKey:@"operations"];
    [self willChangeValueForKey:@"operationCount"];
    [_operations addObject:anOperation];
    [self _sortOpsByPriority:_operations];
    [self didChangeValueForKey:@"operations"];
    [self didChangeValueForKey:@"operationCount"];
}

/*!
Adds the specified array of operations to the queue.
@param ops The array of CPOperation objects that you want to add to the receiver.
@param wait If YES, the method only returns once all of the specified operations finish executing. If NO, the operations are added to the queue and control returns immediately to the caller.
*/
- (void)addOperations:(CPArray)ops waitUntilFinished:(BOOL)wait
{
    if (ops)
    {
        if (wait)
        {
            [self _sortOpsByPriority:ops];
            [self _runOpsSynchronously:ops];
        }

        [_operations addObjectsFromArray:ops];
        [self _sortOpsByPriority:_operations];
    }
}

/*!
Wraps the given js function in a CPOperation and adds it to the queue
@param aFunction the JS function to add
*/
- (void)addOperationWithFunction:(JSObject)aFunction
{
    [self addOperation:[CPFunctionOperation functionOperationWithFunction:aFunction]];
}

- (CPArray)operations
{
    return _operations;
}

- (int)operationCount
{
    if (_operations)
    {
        return [_operations count];
    }

    return 0;
}

/*!
Cancels all queued and executing operations.
*/
- (void)cancelAllOperations
{
    if (_operations)
    {
        var i = 0,
            count = [_operations count];

        for (; i < count; i++)
        {
            [[_operations objectAtIndex:i] cancel];
        }
    }
}

/*!
Blocks until all of the receiver’s queued and executing operations finish executing.
*/
- (void)waitUntilAllOperationsAreFinished
{
    // lets first stop the timer so it won't interfere
    [self _enableTimer:NO];
    [self _runOpsSynchronously:_operations];
    if (!_suspended)
    {
        [self _enableTimer:YES];
    }
}


/*!
Returns the maximum number of concurrent operations that the receiver can execute.
Always returns 1 because JS doesn't have threads
*/
- (int)maxConcurrentOperationCount
{
    return 1;
}

/*!
Modifies the execution of pending operations
@param suspend if YES, queue execution is suspended. If NO, it is resumed
*/
- (void)setSuspended:(BOOL)suspend
{
    _suspended = suspend;
    [self _enableTimer:!suspend];
}

/*!
Returns a Boolean value indicating whether the receiver is scheduling queued operations for execution.
*/
- (BOOL)isSuspended
{
    return _suspended;
}

- (void)_sortOpsByPriority:(CPArray)someOps
{
    if (someOps)
    {
        [someOps sortUsingFunction:function(lhs, rhs)
        {
            if ([lhs queuePriority] < [rhs queuePriority])
            {
                return 1;
            }
            else
            {
                if ([lhs queuePriority] > [rhs queuePriority])
                {
                    return -1;
                }
                else
                {
                    return 0;
                }
            }
        }
        context:nil];
    }
}

- (void)_runOpsSynchronously:(CPArray)ops
{
    if (ops)
    {
        var keepGoing = YES;
        while (keepGoing)
        {
            var i = 0,
                count = [ops count];

            keepGoing = NO;

            // start the ones that are ready
            for (; i < count; i++)
            {
                var op = [ops objectAtIndex:i];
                if ([op isReady] && ![op isCancelled] && ![op isFinished] && ![op isExecuting])
                {
                    [op start];
                }
            }

            // make sure they are all done
            for (i = 0; i < count; i++)
            {
                var op = [ops objectAtIndex:i];
                if (![op isFinished] && ![op isCancelled])
                {
                    keepGoing = YES;
                }
            }
        }
    }
}

/*!
Convenience method for one system wide singleton queue. Returns the same queue as currentQueue.
*/
+ (CPOperationQueue)mainQueue
{
    if (!cpOperationMainQueue)
    {
        cpOperationMainQueue = [[CPOperationQueue alloc] init];
        [cpOperationMainQueue setName:@"main"];
    }

    return cpOperationMainQueue;
}

/*!
Convenience method for one system wide singleton queue. Returns the same queue as mainQueue.
*/
+ (CPOperationQueue)currentQueue
{
    return [CPOperationQueue mainQueue];
}

@end
Something went wrong with that request. Please try again.