Resequencer Using XPath to Extract Sequence Identifiers
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Solution Overview
Problem
In message-based systems, messages often arrive out of order due to dynamic routing and multi-threaded processing, leading to errors and failures when downstream consumers expect them to be in a specific sequence, particularly in ESB architectures where message order cannot be guaranteed by the sender.
Innovation Solution
A resequencer is implemented to reorder messages based on sequence and group identifiers extracted from the message payloads using XPath expressions, allowing for dynamic configuration and flexible sequencing without relying on fixed header information, thereby ensuring correct ordering and grouping of messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If messages are routed dynamically through multiple pathways to improve delivery flexibility and speed, then message delivery speed and routing flexibility are improved, but message delivery order reliability deteriorates
Solution Approach 1:
The patent introduces a resequencer as an intermediary component between the message router and the downstream consumer. This resequencer receives out-of-order messages, buffers them temporarily, and reorders them according to sequence identifiers before forwarding to the consumer. This mediator resolves the contradiction by accepting the speed benefits of dynamic routing while ensuring order reliability at the consumer interface.
Solution Approach 2:
The system performs preliminary actions by embedding sequence identifiers and group identifiers in messages before they enter the dynamic routing system. This allows the resequencer to preemptively organize and reorder messages based on these pre-assigned identifiers, ensuring correct sequencing without affecting the speed benefits of dynamic routing.
2Adaptability or versatility
If sequence identifiers are embedded in message payloads instead of headers to increase flexibility and adaptability, then adaptability and dynamic configuration capability are improved, but message processing complexity increases
Solution Approach 1:
The system uses XPath expressions that automatically locate and extract sequence identifiers from arbitrary positions within message payloads. This self-service approach allows the resequencer to adapt to different message formats and identifier locations without manual configuration, achieving high adaptability while keeping processing logic relatively simple through standardized XPath queries.
3Productivity
If multiple threads concurrently access and process messages to improve processing throughput and productivity, then message processing productivity is improved, but data consistency and ordering accuracy deteriorate
Solution Approach 1:
The patent segments the message processing workload by creating separate processing threads for different message groups identified by group identifiers. Each thread independently processes messages for its assigned group, eliminating contention and the need for complex locking mechanisms. This segmentation maintains high throughput while ensuring ordering accuracy within each group through dedicated thread processing.
Data Source
AI summary
Described is an improved method, system, and computer program product for implementing an improved resequencer, along with related mechanisms and processes. Some embodiments provide an approach for generating a message sequence having start and increment values.