parallel-es/src/node/worker/node-worker-thread-factory.ts

Simple parallelization for EcmaScript

import {fork} from "child_process";

import {IWorkerThreadFactory} from "../../common/worker/worker-thread-factory";
import {DefaultWorkerThread} from "../../common/worker/default-worker-thread";
import {IWorkerThread} from "../../common/worker/worker-thread";
import {DynamicFunctionRegistry} from "../../common/function/dynamic-function-registry";
import {ChildProcessWorkerThreadSlaveCommunicationChannel} from "./child-process-worker-thread-slave-communication-channel";

export class NodeWorkerThreadFactory implements IWorkerThreadFactory {
    constructor(private functionLookupTable: DynamicFunctionRegistry) {}

    public spawn(): IWorkerThread {
        const child = fork(this.getSlaveFileName());
        const workerThread = new DefaultWorkerThread(this.functionLookupTable, new ChildProcessWorkerThreadSlaveCommunicationChannel(child));
        workerThread.initialize();
        return workerThread;
    }

    /**
     * Hackedy Hack... Issue is, webpack handles calls to require resolve and replaces the call with the module id
     * but that's not what we want. We actually want the require resolve call to be left until execution.
     * NoParse is neither an option because then no requires / imports are resolved
     * @returns {string} the file name of the slave
     */
    private getSlaveFileName(): string {
        return eval("require").resolve("./node-slave.parallel");
    }
}