Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const OperationBase = require('./operation').OperationBase;
const Aspect = require('./operation').Aspect;
const defineAspects = require('./operation').defineAspects;
const resolveReadPreference = require('../utils').resolveReadPreference;
class FindOperation extends OperationBase {
constructor(collection, ns, command, options) {
super(options);
this.ns = ns;
this.cmd = command;
this.readPreference = resolveReadPreference(collection, this.options);
}
execute(server, callback) {
// copied from `CommandOperationV2`, to be subclassed in the future
this.server = server;
const cursorState = this.cursorState || {};
// TOOD: use `MongoDBNamespace` through and through
server.query(this.ns.toString(), this.cmd, cursorState, this.options, callback);
}
}
defineAspects(FindOperation, [
Aspect.READ_OPERATION,
Aspect.RETRYABLE,
Aspect.EXECUTE_WITH_SELECTION
]);
module.exports = FindOperation;