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414 lines
20 KiB
414 lines
20 KiB
/** |
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* A single instance of Node.js runs in a single thread. To take advantage of |
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* multi-core systems, the user will sometimes want to launch a cluster of Node.js |
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* processes to handle the load. |
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* |
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* The cluster module allows easy creation of child processes that all share |
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* server ports. |
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* |
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* ```js |
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* import cluster from 'cluster'; |
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* import http from 'http'; |
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* import { cpus } from 'os'; |
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* import process from 'process'; |
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* |
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* const numCPUs = cpus().length; |
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* |
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* if (cluster.isPrimary) { |
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* console.log(`Primary ${process.pid} is running`); |
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* |
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* // Fork workers. |
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* for (let i = 0; i < numCPUs; i++) { |
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* cluster.fork(); |
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* } |
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* |
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* cluster.on('exit', (worker, code, signal) => { |
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* console.log(`worker ${worker.process.pid} died`); |
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* }); |
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* } else { |
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* // Workers can share any TCP connection |
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* // In this case it is an HTTP server |
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* http.createServer((req, res) => { |
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* res.writeHead(200); |
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* res.end('hello world\n'); |
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* }).listen(8000); |
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* |
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* console.log(`Worker ${process.pid} started`); |
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* } |
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* ``` |
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* |
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* Running Node.js will now share port 8000 between the workers: |
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* |
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* ```console |
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* $ node server.js |
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* Primary 3596 is running |
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* Worker 4324 started |
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* Worker 4520 started |
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* Worker 6056 started |
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* Worker 5644 started |
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* ``` |
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* |
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* On Windows, it is not yet possible to set up a named pipe server in a worker. |
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* @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/cluster.js) |
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*/ |
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declare module 'cluster' { |
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import * as child from 'node:child_process'; |
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import EventEmitter = require('node:events'); |
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import * as net from 'node:net'; |
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export interface ClusterSettings { |
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execArgv?: string[] | undefined; // default: process.execArgv |
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exec?: string | undefined; |
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args?: string[] | undefined; |
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silent?: boolean | undefined; |
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stdio?: any[] | undefined; |
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uid?: number | undefined; |
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gid?: number | undefined; |
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inspectPort?: number | (() => number) | undefined; |
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} |
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export interface Address { |
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address: string; |
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port: number; |
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addressType: number | 'udp4' | 'udp6'; // 4, 6, -1, "udp4", "udp6" |
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} |
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/** |
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* A `Worker` object contains all public information and method about a worker. |
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* In the primary it can be obtained using `cluster.workers`. In a worker |
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* it can be obtained using `cluster.worker`. |
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* @since v0.7.0 |
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*/ |
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export class Worker extends EventEmitter { |
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/** |
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* Each new worker is given its own unique id, this id is stored in the`id`. |
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* |
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* While a worker is alive, this is the key that indexes it in`cluster.workers`. |
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* @since v0.8.0 |
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*/ |
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id: number; |
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/** |
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* All workers are created using `child_process.fork()`, the returned object |
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* from this function is stored as `.process`. In a worker, the global `process`is stored. |
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* |
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* See: `Child Process module`. |
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* |
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* Workers will call `process.exit(0)` if the `'disconnect'` event occurs |
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* on `process` and `.exitedAfterDisconnect` is not `true`. This protects against |
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* accidental disconnection. |
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* @since v0.7.0 |
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*/ |
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process: child.ChildProcess; |
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/** |
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* Send a message to a worker or primary, optionally with a handle. |
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* |
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* In the primary this sends a message to a specific worker. It is identical to `ChildProcess.send()`. |
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* |
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* In a worker this sends a message to the primary. It is identical to`process.send()`. |
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* |
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* This example will echo back all messages from the primary: |
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* |
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* ```js |
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* if (cluster.isPrimary) { |
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* const worker = cluster.fork(); |
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* worker.send('hi there'); |
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* |
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* } else if (cluster.isWorker) { |
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* process.on('message', (msg) => { |
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* process.send(msg); |
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* }); |
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* } |
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* ``` |
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* @since v0.7.0 |
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* @param options The `options` argument, if present, is an object used to parameterize the sending of certain types of handles. `options` supports the following properties: |
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*/ |
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send(message: child.Serializable, callback?: (error: Error | null) => void): boolean; |
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send(message: child.Serializable, sendHandle: child.SendHandle, callback?: (error: Error | null) => void): boolean; |
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send(message: child.Serializable, sendHandle: child.SendHandle, options?: child.MessageOptions, callback?: (error: Error | null) => void): boolean; |
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/** |
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* This function will kill the worker. In the primary, it does this |
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* by disconnecting the `worker.process`, and once disconnected, killing |
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* with `signal`. In the worker, it does it by disconnecting the channel, |
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* and then exiting with code `0`. |
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* |
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* Because `kill()` attempts to gracefully disconnect the worker process, it is |
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* susceptible to waiting indefinitely for the disconnect to complete. For example, |
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* if the worker enters an infinite loop, a graceful disconnect will never occur. |
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* If the graceful disconnect behavior is not needed, use `worker.process.kill()`. |
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* |
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* Causes `.exitedAfterDisconnect` to be set. |
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* |
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* This method is aliased as `worker.destroy()` for backward compatibility. |
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* |
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* In a worker, `process.kill()` exists, but it is not this function; |
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* it is `kill()`. |
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* @since v0.9.12 |
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* @param [signal='SIGTERM'] Name of the kill signal to send to the worker process. |
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*/ |
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kill(signal?: string): void; |
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destroy(signal?: string): void; |
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/** |
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* In a worker, this function will close all servers, wait for the `'close'` event |
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* on those servers, and then disconnect the IPC channel. |
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* |
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* In the primary, an internal message is sent to the worker causing it to call`.disconnect()` on itself. |
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* |
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* Causes `.exitedAfterDisconnect` to be set. |
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* |
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* After a server is closed, it will no longer accept new connections, |
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* but connections may be accepted by any other listening worker. Existing |
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* connections will be allowed to close as usual. When no more connections exist, |
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* see `server.close()`, the IPC channel to the worker will close allowing it |
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* to die gracefully. |
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* |
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* The above applies _only_ to server connections, client connections are not |
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* automatically closed by workers, and disconnect does not wait for them to close |
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* before exiting. |
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* |
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* In a worker, `process.disconnect` exists, but it is not this function; |
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* it is `disconnect()`. |
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* |
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* Because long living server connections may block workers from disconnecting, it |
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* may be useful to send a message, so application specific actions may be taken to |
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* close them. It also may be useful to implement a timeout, killing a worker if |
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* the `'disconnect'` event has not been emitted after some time. |
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* |
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* ```js |
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* if (cluster.isPrimary) { |
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* const worker = cluster.fork(); |
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* let timeout; |
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* |
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* worker.on('listening', (address) => { |
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* worker.send('shutdown'); |
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* worker.disconnect(); |
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* timeout = setTimeout(() => { |
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* worker.kill(); |
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* }, 2000); |
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* }); |
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* |
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* worker.on('disconnect', () => { |
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* clearTimeout(timeout); |
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* }); |
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* |
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* } else if (cluster.isWorker) { |
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* const net = require('net'); |
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* const server = net.createServer((socket) => { |
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* // Connections never end |
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* }); |
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* |
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* server.listen(8000); |
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* |
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* process.on('message', (msg) => { |
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* if (msg === 'shutdown') { |
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* // Initiate graceful close of any connections to server |
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* } |
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* }); |
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* } |
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* ``` |
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* @since v0.7.7 |
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* @return A reference to `worker`. |
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*/ |
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disconnect(): void; |
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/** |
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* This function returns `true` if the worker is connected to its primary via its |
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* IPC channel, `false` otherwise. A worker is connected to its primary after it |
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* has been created. It is disconnected after the `'disconnect'` event is emitted. |
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* @since v0.11.14 |
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*/ |
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isConnected(): boolean; |
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/** |
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* This function returns `true` if the worker's process has terminated (either |
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* because of exiting or being signaled). Otherwise, it returns `false`. |
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* |
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* ```js |
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* import cluster from 'cluster'; |
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* import http from 'http'; |
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* import { cpus } from 'os'; |
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* import process from 'process'; |
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* |
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* const numCPUs = cpus().length; |
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* |
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* if (cluster.isPrimary) { |
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* console.log(`Primary ${process.pid} is running`); |
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* |
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* // Fork workers. |
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* for (let i = 0; i < numCPUs; i++) { |
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* cluster.fork(); |
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* } |
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* |
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* cluster.on('fork', (worker) => { |
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* console.log('worker is dead:', worker.isDead()); |
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* }); |
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* |
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* cluster.on('exit', (worker, code, signal) => { |
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* console.log('worker is dead:', worker.isDead()); |
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* }); |
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* } else { |
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* // Workers can share any TCP connection. In this case, it is an HTTP server. |
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* http.createServer((req, res) => { |
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* res.writeHead(200); |
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* res.end(`Current process\n ${process.pid}`); |
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* process.kill(process.pid); |
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* }).listen(8000); |
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* } |
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* ``` |
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* @since v0.11.14 |
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*/ |
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isDead(): boolean; |
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/** |
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* This property is `true` if the worker exited due to `.kill()` or`.disconnect()`. If the worker exited any other way, it is `false`. If the |
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* worker has not exited, it is `undefined`. |
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* |
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* The boolean `worker.exitedAfterDisconnect` allows distinguishing between |
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* voluntary and accidental exit, the primary may choose not to respawn a worker |
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* based on this value. |
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* |
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* ```js |
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* cluster.on('exit', (worker, code, signal) => { |
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* if (worker.exitedAfterDisconnect === true) { |
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* console.log('Oh, it was just voluntary – no need to worry'); |
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* } |
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* }); |
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* |
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* // kill worker |
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* worker.kill(); |
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* ``` |
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* @since v6.0.0 |
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*/ |
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exitedAfterDisconnect: boolean; |
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/** |
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* events.EventEmitter |
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* 1. disconnect |
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* 2. error |
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* 3. exit |
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* 4. listening |
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* 5. message |
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* 6. online |
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*/ |
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addListener(event: string, listener: (...args: any[]) => void): this; |
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addListener(event: 'disconnect', listener: () => void): this; |
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addListener(event: 'error', listener: (error: Error) => void): this; |
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addListener(event: 'exit', listener: (code: number, signal: string) => void): this; |
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addListener(event: 'listening', listener: (address: Address) => void): this; |
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addListener(event: 'message', listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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addListener(event: 'online', listener: () => void): this; |
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emit(event: string | symbol, ...args: any[]): boolean; |
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emit(event: 'disconnect'): boolean; |
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emit(event: 'error', error: Error): boolean; |
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emit(event: 'exit', code: number, signal: string): boolean; |
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emit(event: 'listening', address: Address): boolean; |
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emit(event: 'message', message: any, handle: net.Socket | net.Server): boolean; |
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emit(event: 'online'): boolean; |
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on(event: string, listener: (...args: any[]) => void): this; |
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on(event: 'disconnect', listener: () => void): this; |
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on(event: 'error', listener: (error: Error) => void): this; |
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on(event: 'exit', listener: (code: number, signal: string) => void): this; |
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on(event: 'listening', listener: (address: Address) => void): this; |
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on(event: 'message', listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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on(event: 'online', listener: () => void): this; |
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once(event: string, listener: (...args: any[]) => void): this; |
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once(event: 'disconnect', listener: () => void): this; |
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once(event: 'error', listener: (error: Error) => void): this; |
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once(event: 'exit', listener: (code: number, signal: string) => void): this; |
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once(event: 'listening', listener: (address: Address) => void): this; |
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once(event: 'message', listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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once(event: 'online', listener: () => void): this; |
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prependListener(event: string, listener: (...args: any[]) => void): this; |
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prependListener(event: 'disconnect', listener: () => void): this; |
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prependListener(event: 'error', listener: (error: Error) => void): this; |
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prependListener(event: 'exit', listener: (code: number, signal: string) => void): this; |
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prependListener(event: 'listening', listener: (address: Address) => void): this; |
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prependListener(event: 'message', listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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prependListener(event: 'online', listener: () => void): this; |
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prependOnceListener(event: string, listener: (...args: any[]) => void): this; |
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prependOnceListener(event: 'disconnect', listener: () => void): this; |
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prependOnceListener(event: 'error', listener: (error: Error) => void): this; |
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prependOnceListener(event: 'exit', listener: (code: number, signal: string) => void): this; |
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prependOnceListener(event: 'listening', listener: (address: Address) => void): this; |
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prependOnceListener(event: 'message', listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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prependOnceListener(event: 'online', listener: () => void): this; |
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} |
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export interface Cluster extends EventEmitter { |
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disconnect(callback?: () => void): void; |
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fork(env?: any): Worker; |
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/** @deprecated since v16.0.0 - use isPrimary. */ |
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readonly isMaster: boolean; |
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readonly isPrimary: boolean; |
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readonly isWorker: boolean; |
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schedulingPolicy: number; |
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readonly settings: ClusterSettings; |
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/** @deprecated since v16.0.0 - use setupPrimary. */ |
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setupMaster(settings?: ClusterSettings): void; |
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/** |
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* `setupPrimary` is used to change the default 'fork' behavior. Once called, the settings will be present in cluster.settings. |
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*/ |
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setupPrimary(settings?: ClusterSettings): void; |
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readonly worker?: Worker | undefined; |
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readonly workers?: NodeJS.Dict<Worker> | undefined; |
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readonly SCHED_NONE: number; |
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readonly SCHED_RR: number; |
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/** |
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* events.EventEmitter |
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* 1. disconnect |
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* 2. exit |
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* 3. fork |
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* 4. listening |
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* 5. message |
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* 6. online |
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* 7. setup |
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*/ |
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addListener(event: string, listener: (...args: any[]) => void): this; |
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addListener(event: 'disconnect', listener: (worker: Worker) => void): this; |
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addListener(event: 'exit', listener: (worker: Worker, code: number, signal: string) => void): this; |
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addListener(event: 'fork', listener: (worker: Worker) => void): this; |
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addListener(event: 'listening', listener: (worker: Worker, address: Address) => void): this; |
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addListener(event: 'message', listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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addListener(event: 'online', listener: (worker: Worker) => void): this; |
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addListener(event: 'setup', listener: (settings: ClusterSettings) => void): this; |
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emit(event: string | symbol, ...args: any[]): boolean; |
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emit(event: 'disconnect', worker: Worker): boolean; |
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emit(event: 'exit', worker: Worker, code: number, signal: string): boolean; |
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emit(event: 'fork', worker: Worker): boolean; |
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emit(event: 'listening', worker: Worker, address: Address): boolean; |
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emit(event: 'message', worker: Worker, message: any, handle: net.Socket | net.Server): boolean; |
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emit(event: 'online', worker: Worker): boolean; |
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emit(event: 'setup', settings: ClusterSettings): boolean; |
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on(event: string, listener: (...args: any[]) => void): this; |
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on(event: 'disconnect', listener: (worker: Worker) => void): this; |
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on(event: 'exit', listener: (worker: Worker, code: number, signal: string) => void): this; |
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on(event: 'fork', listener: (worker: Worker) => void): this; |
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on(event: 'listening', listener: (worker: Worker, address: Address) => void): this; |
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on(event: 'message', listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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on(event: 'online', listener: (worker: Worker) => void): this; |
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on(event: 'setup', listener: (settings: ClusterSettings) => void): this; |
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once(event: string, listener: (...args: any[]) => void): this; |
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once(event: 'disconnect', listener: (worker: Worker) => void): this; |
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once(event: 'exit', listener: (worker: Worker, code: number, signal: string) => void): this; |
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once(event: 'fork', listener: (worker: Worker) => void): this; |
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once(event: 'listening', listener: (worker: Worker, address: Address) => void): this; |
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once(event: 'message', listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined. |
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once(event: 'online', listener: (worker: Worker) => void): this; |
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once(event: 'setup', listener: (settings: ClusterSettings) => void): this; |
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prependListener(event: string, listener: (...args: any[]) => void): this; |
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prependListener(event: 'disconnect', listener: (worker: Worker) => void): this; |
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prependListener(event: 'exit', listener: (worker: Worker, code: number, signal: string) => void): this; |
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prependListener(event: 'fork', listener: (worker: Worker) => void): this; |
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prependListener(event: 'listening', listener: (worker: Worker, address: Address) => void): this; |
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// the handle is a net.Socket or net.Server object, or undefined. |
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prependListener(event: 'message', listener: (worker: Worker, message: any, handle?: net.Socket | net.Server) => void): this; |
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prependListener(event: 'online', listener: (worker: Worker) => void): this; |
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prependListener(event: 'setup', listener: (settings: ClusterSettings) => void): this; |
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prependOnceListener(event: string, listener: (...args: any[]) => void): this; |
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prependOnceListener(event: 'disconnect', listener: (worker: Worker) => void): this; |
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prependOnceListener(event: 'exit', listener: (worker: Worker, code: number, signal: string) => void): this; |
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prependOnceListener(event: 'fork', listener: (worker: Worker) => void): this; |
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prependOnceListener(event: 'listening', listener: (worker: Worker, address: Address) => void): this; |
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// the handle is a net.Socket or net.Server object, or undefined. |
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prependOnceListener(event: 'message', listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; |
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prependOnceListener(event: 'online', listener: (worker: Worker) => void): this; |
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prependOnceListener(event: 'setup', listener: (settings: ClusterSettings) => void): this; |
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} |
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const cluster: Cluster; |
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export default cluster; |
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} |
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declare module 'node:cluster' { |
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export * from 'cluster'; |
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export { default as default } from 'cluster'; |
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}
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