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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "FIRAuthSerialTaskQueue.h"
#import "FIRAuthGlobalWorkQueue.h"
@implementation FIRAuthSerialTaskQueue {
/** @var _dispatchQueue
@brief The asyncronous dispatch queue into which tasks are enqueued and processed
serially.
*/
dispatch_queue_t _dispatchQueue;
}
- (instancetype)init {
self = [super init];
if (self) {
_dispatchQueue = dispatch_queue_create("com.google.firebase.auth.serialTaskQueue", NULL);
dispatch_set_target_queue(_dispatchQueue, FIRAuthGlobalWorkQueue());
}
return self;
}
- (void)enqueueTask:(FIRAuthSerialTask)task {
// This dispatch queue will run tasks serially in FIFO order, as long as it's not suspended.
dispatch_async(self->_dispatchQueue, ^{
// But as soon as a task is started, stop other tasks from running until the task calls it's
// completion handler, which allows the queue to resume processing of tasks. This allows the
// task to perform other asyncronous actions on other dispatch queues and "get back to us" when
// all of their sub-tasks are complete.
dispatch_suspend(self->_dispatchQueue);
task(^{
dispatch_resume(self->_dispatchQueue);
});
});
}
@end
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