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| import { buffers, channel } from "redux-saga"; | |
| import { all, call, fork, put, take } from "redux-saga/effects"; | |
| /** | |
| * creates a queue | |
| * | |
| * @param {GeneratorFunction} [handler] request handler | |
| * @param {number} [workersCount=1] number of workers | |
| */ | |
| function* createConcurrentTaskQueue(handler, workersCount = 1) { | |
| // create a channel to queue incoming action | |
| const queueChannel = yield call(channel, buffers.expanding()); | |
| // watch for actions and delegate them as tasks to the workers | |
| function* watcher() { | |
| // create a channel to queue incoming tasks | |
| const workersChannel = yield call(channel, buffers.expanding()); | |
| // create n worker 'threads' | |
| yield all(Array(workersCount).fill(fork(worker, workersChannel))); | |
| while (true) { | |
| const { payload } = yield take(queueChannel); | |
| yield put(workersChannel, payload); | |
| } | |
| } | |
| // worker that wait for a task | |
| function* worker(chan) { | |
| while (true) { | |
| const payload = yield take(chan); | |
| yield handler(payload); | |
| } | |
| } | |
| function* queue(action){ | |
| yield put(addTaskChannel, action) | |
| } | |
| return { | |
| watcher, | |
| queue, | |
| }; | |
| } | |
| export default createConcurrentTaskQueue; |
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| function* handler(payload){ | |
| ... | |
| } | |
| function* bulkMsgs(action){ | |
| const { msgs } = action.payload | |
| const concurrentTaskQueue = yield createConcurrentTaskQueue(handler, 3) | |
| for (msg in msgs){ | |
| concurrentTaskQueue.queue({ type: 'SEND', payload: msg }) | |
| } | |
| } |
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