Extending the life of object in cache

There are two way to extend object's life in cache - relative timeframe and fixed timeframe. With the relative timeframe a period of time is added to the timestamp of the call to determine the new expiration time. The fixed timestamp approach sets the timestamp when the object must expire from cache.

Objective-CSwift

- (void)expireInKey:(NSString * _Nonnull)key seconds:(NSInteger)seconds responseHandler:^(void)responseHandler errorHandler:^(Fault * _Nonnull)errorHandler;

- (void)expireAtKey:(NSString * _Nonnull)key date:(NSDate * _Nonnull)date responseHandler:^(void)responseHandler errorHandler:^(Fault * _Nonnull)errorHandler;

func expireIn(key: String, seconds: Int, responseHandler: (() -> Void)!, errorHandler: ((Fault) -> Void)!)

func expireAt(key: String, date: Date, responseHandler: (() -> Void)!, errorHandler: ((Fault) -> Void)!)

where:

Argument	Description
key	identifies the object to extend the life of in cache.
seconds	number of seconds to extend the life of object in cache by. Must be a value between 1 and 7200 (2 hours).
date	date when the object should expire and removed from cache. The difference between date and the current time must be equal or less than 7200000 milliseconds (2 hours).

Example

Objective-CSwift

[Backendless.shared.cache expireInKey:@"CacheWeather" seconds:3600 responseHandler:^{
    NSLog(@"Object's life has been extended");
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

//

[Backendless.shared.cache expireAtKey:@"CacheWeather" date:[NSDate dateWithTimeIntervalSinceNow:3600] responseHandler:^{
    NSLog(@"Object's life has been extended");
} errorHandler:^(Fault *fault) {
    NSLog(@"Error: %@", fault.message);
}];

Backendless.shared.cache.expireIn(key: "CacheWeather", seconds: 3600, responseHandler: {
    print("Object's life has been extended")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

//

Backendless.shared.cache.expireAt(key: "CacheWeather", date: Date(timeIntervalSinceNow: 3600), responseHandler: {
    print("Object's life has been extended")
}, errorHandler: { fault in
    print("Error: \(fault.message ?? "")")
})

Codeless Reference

where:

Argument	Description
key name	Key assigned to the object to identify it in cache. The key is used to extend the life of an object in the cache.
in seconds	Number of seconds to extend the life of an object in cache by. Must be a value between 1 and 7200 (2 hours).

This operation does not return a value.

Consider the expiration time(expireAt column) of the following key-value pair stored in cache:

The example below extends the life of the object associated with the "orderName" key by 7200 seconds(2 hours)

The operation has successfully extended the life of the object. The value in the expireAt column indicates the corresponding change (before: 04/10/2023 16:57:23) -> (after: 04/10/2023 18:10:35)