Message Provider Mutual Exclusion for Single Instance Routing
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Solution Overview
Problem
In message processing systems using the publish-subscribe model, there is no mechanism to ensure that a message is sent to a single application instance among multiple instances subscribed to a topic, leading to potential duplication and inefficient processing.
Innovation Solution
Implementing a mutual exclusion function mechanism where each application instance sends a unique mutual exclusion function to a message provider, which executes these functions to ensure that a message is sent to only one application instance, using the instance identifier and total instance count to determine the correct recipient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the publish-subscribe model is used with multiple application instances subscribed to a topic, then the system provides load balancing and message distribution, but there is no mechanism to ensure that a message is sent to a single application instance, leading to message duplication and inefficient processing
Solution Approach 1:
The message provider acts as an intermediary between the message source and multiple application instances. It receives mutual exclusion functions from each instance and executes them to determine which single instance should receive the message, thereby mediating the distribution while ensuring uniqueness.
Solution Approach 2:
Each application instance provides its own mutual exclusion function that it sends to the message provider. The instance essentially serves itself by defining the logic that will determine whether it should receive a particular message, based on its instance identifier and the total number of instances.
2Adaptability or versatility
If messages are sent to all subscribed application instances in the publish-subscribe model, then all instances receive the message for local processing, but this causes message duplication and wasted processing resources
Solution Approach 1:
The message distribution is made selective rather than uniform. Each message is evaluated against the mutual exclusion function of each instance, and only the instance for which the function returns true receives the message. This creates local quality in the sense that different instances receive different messages based on their specific characteristics.
Solution Approach 2:
The system uses instance-specific parameters (instance identifier and total instance count) within the mutual exclusion function to dynamically determine message routing. By changing the parameter values in the function, the system can adaptively route messages to different instances without duplicating delivery.
3Productivity
If a mutual exclusion function mechanism is implemented to ensure single instance message delivery, then message duplication is prevented and processing efficiency improves, but the system complexity increases due to the need to manage and execute these functions
Solution Approach 1:
The mutual exclusion logic is extracted from the application instances and placed in the message provider. Instead of each instance having to communicate with others or maintain complex state, the instances simply send their exclusion functions to the provider, which then handles the execution and decision-making centrally.
Solution Approach 2:
Each application instance sends a copy of its mutual exclusion function to the message provider. The provider stores and executes these function copies to make routing decisions, eliminating the need for instances to directly interact or maintain awareness of each other's state.
Data Source
AI summary
A method for processing a message by a message provider that includes receiving, for a topic, a mutual exclusion function from each application instance of a plurality of application instances, receiving the message for the topic, and sending the message to one application instance of the plurality of application instances based on executing each of the mutual exclusion functions, wherein the mutual exclusion functions ensure that the message is sent to a single application instance of the plurality of application instances.