Notifications based on queues

A method comprising:

• receiving, from an application, a request to schedule a notification, the request comprising a recipient, a message, a time value, and a first set of interactions;
• generating a pending notification comprising the recipient, the message, a defined set of interactions that corresponds to the first set of interactions, a creation time that represents a time at which the pending notification is generated, and an expiration time that represents a sum of the creation time and the time value;
• storing the pending notification in a queue;
• periodically iterating through the queue to check whether the expiration time of the pending notification has elapsed;
• upon determining that the expiration time of the pending notification has elapsed, deleting the pending notification from the queue without processing the pending notification;
• and
• upon receiving from the application a second set of interactions performed on the application that matches the defined set of interactions specified in the pending notification, processing the pending notification by sending the recipient specified in the pending notification a notification comprising the message specified in the pending notification.

A system comprising:

• a set of processing units;
• and
• a non-transitory machine-readable medium storing instructions that when executed by at least one processing unit in the set of processing units cause the at least one processing unit to:
• receive, from an application, a request to schedule a notification, the request comprising a recipient, a message, a time value, and a first set of interactions;
• generate a pending notification comprising the recipient, the message, a defined set of interactions that corresponds to the first set of interactions, a creation time that represents a time at which the pending notification is generated, and an expiration time that represents a sum of the creation time and the time value;
• store the pending notification in a queue;
• periodically iterate through the queue to check whether the expiration time of the pending notification has elapsed;
• upon determining that the expiration time of the pending notification has elapsed, delete the pending notification from the queue without processing the pending notification;
• and
• upon receiving from the application a second set of interactions performed on the application that matches the defined set of interactions specified in the pending notification, process the pending notification by sending the recipient specified in the pending notification a notification comprising the message specified in the pending notification.