Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const Aspect = require('./operation').Aspect;
const defineAspects = require('./operation').defineAspects;
const CommandOperationV2 = require('./command_v2');
class EstimatedDocumentCountOperation extends CommandOperationV2 {
constructor(collection, query, options) {
if (typeof options === 'undefined') {
options = query;
query = undefined;
}
super(collection, options);
this.collectionName = collection.s.namespace.collection;
if (query) {
this.query = query;
}
}
execute(server, callback) {
const options = this.options;
const cmd = { count: this.collectionName };
if (this.query) {
cmd.query = this.query;
}
if (typeof options.skip === 'number') {
cmd.skip = options.skip;
}
if (typeof options.limit === 'number') {
cmd.limit = options.limit;
}
if (options.hint) {
cmd.hint = options.hint;
}
super.executeCommand(server, cmd, (err, response) => {
if (err) {
callback(err);
return;
}
callback(null, response.n);
});
}
}
defineAspects(EstimatedDocumentCountOperation, [
Aspect.READ_OPERATION,
Aspect.RETRYABLE,
Aspect.EXECUTE_WITH_SELECTION
]);
module.exports = EstimatedDocumentCountOperation;