//
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// ForegroundReconnection.m
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// MQTTClient
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//
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// Created by Josip Cavar on 22/08/2017.
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// Copyright © 2017 Christoph Krey. All rights reserved.
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//
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#import "ForegroundReconnection.h"
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#if TARGET_OS_IPHONE == 1
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#import "MQTTSessionManager.h"
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#import <UIKit/UIKit.h>
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@interface ForegroundReconnection ()
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@property (nonatomic) UIBackgroundTaskIdentifier backgroundTask;
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@end
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@implementation ForegroundReconnection
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- (instancetype)initWithMQTTSessionManager:(MQTTSessionManager *)manager {
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self = [super init];
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self.sessionManager = manager;
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self.backgroundTask = UIBackgroundTaskInvalid;
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NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
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[defaultCenter addObserver:self
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selector:@selector(appWillResignActive)
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name:UIApplicationWillResignActiveNotification
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object:nil];
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[defaultCenter addObserver:self
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selector:@selector(appDidEnterBackground)
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name:UIApplicationDidEnterBackgroundNotification
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object:nil];
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[defaultCenter addObserver:self
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selector:@selector(appDidBecomeActive)
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name:UIApplicationDidBecomeActiveNotification
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object:nil];
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return self;
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}
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- (void)dealloc {
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NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
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[defaultCenter removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
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[defaultCenter removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
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[defaultCenter removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
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}
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- (void)appWillResignActive {
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[self.sessionManager disconnectWithDisconnectHandler:nil];
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}
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- (void)appDidEnterBackground {
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if (!self.sessionManager.requiresTearDown) {
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// we don't want to tear down session as it's already closed
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return;
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}
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__weak typeof(self) weakSelf = self;
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self.backgroundTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
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__strong typeof(weakSelf) strongSelf = weakSelf;
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[strongSelf endBackgroundTask];
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}];
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}
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- (void)appDidBecomeActive {
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[self.sessionManager connectToLast:nil];
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}
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- (void)endBackgroundTask {
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if (self.backgroundTask) {
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[[UIApplication sharedApplication] endBackgroundTask:self.backgroundTask];
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self.backgroundTask = UIBackgroundTaskInvalid;
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}
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}
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@end
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#endif
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