The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
3.8 KiB
95 lines
3.8 KiB
/* |
|
* |
|
* Copyright 2015, Google Inc. |
|
* All rights reserved. |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions are |
|
* met: |
|
* |
|
* * Redistributions of source code must retain the above copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* * Redistributions in binary form must reproduce the above |
|
* copyright notice, this list of conditions and the following disclaimer |
|
* in the documentation and/or other materials provided with the |
|
* distribution. |
|
* * Neither the name of Google Inc. nor the names of its |
|
* contributors may be used to endorse or promote products derived from |
|
* this software without specific prior written permission. |
|
* |
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
|
* |
|
*/ |
|
|
|
#import "GRPCCompletionQueue.h" |
|
|
|
#import <grpc/grpc.h> |
|
|
|
@implementation GRPCCompletionQueue |
|
|
|
+ (instancetype)completionQueue { |
|
// TODO(jcanizales): Reuse completion queues to consume only one thread, |
|
// instead of one per call. |
|
return [[self alloc] init]; |
|
} |
|
|
|
- (instancetype)init { |
|
if ((self = [super init])) { |
|
_unmanagedQueue = grpc_completion_queue_create(); |
|
|
|
// This is for the following block to capture the pointer by value (instead |
|
// of retaining self and doing self->_unmanagedQueue). This is essential |
|
// because the block doesn't end until after grpc_completion_queue_shutdown |
|
// is called, and we only want that to happen after nobody's using the queue |
|
// anymore (i.e. on self dealloc). So the block would never end if it |
|
// retained self. |
|
grpc_completion_queue *unmanagedQueue = _unmanagedQueue; |
|
|
|
// Start a loop on a concurrent queue to read events from the completion |
|
// queue and dispatch each. |
|
static dispatch_once_t initialization; |
|
static dispatch_queue_t gDefaultConcurrentQueue; |
|
dispatch_once(&initialization, ^{ |
|
gDefaultConcurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); |
|
}); |
|
dispatch_async(gDefaultConcurrentQueue, ^{ |
|
while (YES) { |
|
// The following call blocks until an event is available. |
|
grpc_event event = grpc_completion_queue_next(unmanagedQueue, |
|
gpr_inf_future(GPR_CLOCK_REALTIME)); |
|
GRPCQueueCompletionHandler handler; |
|
switch (event.type) { |
|
case GRPC_OP_COMPLETE: |
|
handler = (__bridge_transfer GRPCQueueCompletionHandler)event.tag; |
|
handler(event.success); |
|
break; |
|
case GRPC_QUEUE_SHUTDOWN: |
|
grpc_completion_queue_destroy(unmanagedQueue); |
|
return; |
|
default: |
|
[NSException raise:@"Unrecognized completion type" format:@""]; |
|
} |
|
}; |
|
}); |
|
} |
|
return self; |
|
} |
|
|
|
- (void)dealloc { |
|
// This makes the completion queue produce a GRPC_QUEUE_SHUTDOWN event *after* |
|
// all other pending events are flushed. What this means is all the blocks |
|
// passed to the gRPC C library as void* are eventually called, even if some |
|
// are called after self is dealloc'd. |
|
grpc_completion_queue_shutdown(_unmanagedQueue); |
|
} |
|
@end
|
|
|