Design Patterns MCP Server

{ "id": "channels", "name": "Channels Pattern", "category": "Concurrency", "description": "Communication primitive for coroutine-based producer-consumer patterns with backpressure", "when_to_use": "Data streaming between coroutines, backpressure handling, actor communication", "benefits": "Type safety, backpressure, cancellation support, flow control", "drawbacks": "Learning curve, channel management, potential deadlocks", "use_cases": "Data pipelines, streaming processing, actor communication, work distribution", "complexity": "Medium", "tags": ["concurrency", "kotlin", "communication", "backpressure", "producer-consumer"], "examples": { "kotlin": { "language": "kotlin", "code": "import kotlinx.coroutines.channels.*\n\nsuspend fun produceNumbers(channel: SendChannel<Int>) {\n for (i in 1..10) {\n channel.send(i)\n delay(100) // Simulate work\n }\n channel.close()\n}\n\nsuspend fun consumeNumbers(channel: ReceiveChannel<Int>) {\n for (number in channel) {\n println(\"Received: $number\")\n processNumber(number)\n }\n}\n\nsuspend fun filterNumbers(\n input: ReceiveChannel<Int>, \n output: SendChannel<Int>\n) {\n for (number in input) {\n if (number % 2 == 0) {\n output.send(number)\n }\n }\n output.close()\n}\n\nfun main() = runBlocking {\n val numbers = Channel<Int>()\n val evenNumbers = Channel<Int>(5) // Buffered channel\n \n launch { produceNumbers(numbers) }\n launch { filterNumbers(numbers, evenNumbers) }\n consumeNumbers(evenNumbers)\n}\n\n// Actor pattern with channels\nsuspend fun actorProcessor(\n mailbox: Channel<ActorMessage>\n) = coroutineScope {\n for (message in mailbox) {\n when (message) {\n is ProcessData -> processData(message.data)\n is Shutdown -> break\n }\n }\n}" } } }