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Diffstat (limited to 'Frameworks/SPMySQLFramework/Source/SPMySQLKeepAliveTimer.m')
-rw-r--r-- | Frameworks/SPMySQLFramework/Source/SPMySQLKeepAliveTimer.m | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/Frameworks/SPMySQLFramework/Source/SPMySQLKeepAliveTimer.m b/Frameworks/SPMySQLFramework/Source/SPMySQLKeepAliveTimer.m new file mode 100644 index 00000000..f9164aff --- /dev/null +++ b/Frameworks/SPMySQLFramework/Source/SPMySQLKeepAliveTimer.m @@ -0,0 +1,127 @@ +// +// $Id$ +// +// SPMySQLKeepAliveTimer.m +// SPMySQLFramework +// +// Created by Rowan Beentje (rowan.beent.je) on March 5, 2012 +// Copyright (c) 2012 Rowan Beentje. All rights reserved. +// +// Permission is hereby granted, free of charge, to any person +// obtaining a copy of this software and associated documentation +// files (the "Software"), to deal in the Software without +// restriction, including without limitation the rights to use, +// copy, modify, merge, publish, distribute, sublicense, and/or sell +// copies of the Software, and to permit persons to whom the +// Software is furnished to do so, subject to the following +// conditions: +// +// The above copyright notice and this permission notice shall be +// included in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES +// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT +// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +// OTHER DEALINGS IN THE SOFTWARE. +// +// More info at <http://code.google.com/p/sequel-pro/> + + +#import "SPMySQLKeepAliveTimer.h" +#import "SPMySQL Private APIs.h" + +@interface SPMySQLKeepAliveTimer (Private_API) + +- (void)_initKeepAliveTimer; +- (void)_forwardPing; + +@end + +#pragma mark - + +@implementation SPMySQLKeepAliveTimer + +/** + * Prevent SPMySQLKeepAliveTimer from being init'd normally. + */ +- (id)init +{ + [NSException raise:NSInternalInconsistencyException format:@"SPMySQLKeepAliveTimers should not be init'd directly; use initWithInterval:target:selector: instead."]; + return nil; +} + +/** + * Initialise the SPMySQLKeepAliveTimer. This also sets up the contained timer, + * which has to be wrapped in this class to prevent retain cycles preventing the + * parent connection from being released. + * + * After initialisation, the delegate should be set to ensure that the timer events + * are received. + */ +- (id)initWithInterval:(NSTimeInterval)anInterval target:(id)aTarget selector:(SEL)aSelector +{ + if ((self = [super init])) { + wrappedTimer = nil; + + // Keep a weak reference to the target + timerTarget = aTarget; + timerSelector = aSelector; + timerRepeatInterval = anInterval; + + // Ensure the timer is set up on the main thread + if ([NSThread isMainThread]) { + [self _initKeepAliveTimer]; + } else { + [self performSelectorOnMainThread:@selector(_initKeepAliveTimer) withObject:nil waitUntilDone:YES]; + } + } + + return self; +} + +/** + * Invalidate the wrapped timer, which also releases the reference to the timer + * target (this object), breaking retain loops. + */ +- (void)invalidate +{ + if ([NSThread isMainThread]) { + [wrappedTimer invalidate]; + } else { + [wrappedTimer performSelectorOnMainThread:@selector(invalidate) withObject:nil waitUntilDone:YES]; + } +} + +- (void)dealloc +{ + [wrappedTimer dealloc]; + [super dealloc]; +} + +@end + +@implementation SPMySQLKeepAliveTimer (Private_API) + +/** + * Set up the timer to tickle the target. This must be set up on the main thread + * to ensure the timer events keep firing. + */ +- (void)_initKeepAliveTimer +{ + wrappedTimer = [[NSTimer scheduledTimerWithTimeInterval:timerRepeatInterval target:self selector:@selector(_forwardPing) userInfo:nil repeats:YES] retain]; +} + +/** + * Forward the NSTimer-fired ping to the target object. Performing this forwarding + * breaks the retain cycle. + */ +- (void)_forwardPing +{ + [timerTarget performSelector:timerSelector]; +} + +@end |