Design Patterns MCP Server

{ "id": "balking", "name": "Balking Pattern", "category": "Concurrency", "description": "Prevents object from executing if it's in inappropriate state", "when_to_use": "State checking\nResource availability\nConditional execution", "benefits": "State safety\nResource protection\nSimple logic\nError prevention", "drawbacks": "Lost operations\nState management\nTiming issues", "use_cases": "Resource management\nState machines\nService availability", "complexity": "Low", "tags": [ "concurrency", "state", "protection" ], "examples": { "typescript": { "language": "typescript", "code": "// Balking: abort if object is not in appropriate state\nclass Document {\n private modified = false;\n private saving = false;\n \n edit(content: string): void {\n this.modified = true;\n }\n \n async save(): Promise<boolean> {\n // Balk if already saving\n if (this.saving) {\n console.log('Save already in progress, balking');\n return false;\n }\n \n // Balk if no changes\n if (!this.modified) {\n console.log('No changes to save, balking');\n return false;\n }\n \n this.saving = true;\n try {\n await this.performSave();\n this.modified = false;\n return true;\n } finally {\n this.saving = false;\n }\n }\n \n private async performSave(): Promise<void> {\n console.log('Saving document...');\n await new Promise(resolve => setTimeout(resolve, 1000));\n }\n}\n\nconst doc = new Document();\ndoc.edit('new content');\n\n// Multiple save attempts\nawait Promise.all([\n doc.save(), // Proceeds\n doc.save(), // Balks (already saving)\n doc.save() // Balks (already saving)\n]);" } } }