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+//
+// $Id$
+//
+// 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