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🔔 Subscribe to Our ChannelWhat is the Coarse-Grained Lock Pattern?
The Coarse-Grained Lock design pattern is an offline concurrency pattern belonging to enterprise application architecture. In simple terms, it allows you to lock a set of related objects with a single lock.
Rather than placing individual locks on several child items (fine-grained locking), a single coarse-grained lock covers the entire group of related items under one root object. This simplifies concurrency management and prevents conflicting concurrent updates across related records.
Real-World Example: Customer & Address Hierarchy
Consider a business domain where a single Customer has multiple Addresses (one-to-many relationship):
- The Problem: It makes little business sense for User A to edit Customer personal details while User B simultaneously updates that same customer's address records. Both actions modify the overall customer state and can lead to conflicting data.
- The Solution: Instead of locking each address row individually, we lock the parent Customer object by setting its
Lock = 'Y'. - Conflict Prevention: While User A is editing the customer and their related addresses, User B cannot modify any part of the customer or address data until User A completes the task and releases the lock back to
'N'.
Key Advantages
- Simplicity: You manage one lock state on the root entity rather than juggling numerous locks across child tables.
- Data Integrity: Ensures entire aggregate object groups stay consistent throughout a multi-step business transaction.
- Reduced Overhead: Fewer lock checks and updates reduce database coordination overhead.
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| Coarse-Grained Lock Design Pattern |
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