cluster: use Map to track indexes

PR-URL: #23125 Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Denys Otrishko <[email protected]>

Author: cjihrig

lib/internal/cluster/child.js

@@ -8,7 +8,7 @@ const Worker = require('internal/cluster/worker');
 const{ internal, sendHelper }=require('internal/cluster/utils');
 constcluster=newEventEmitter();
 consthandles={};
-constindexes={};
+constindexes=newMap();
 constnoop=()=>{};
 
 module.exports=cluster;
@@ -62,14 +62,18 @@ cluster._getServer = function(obj, options, cb){
 options.addressType,
 options.fd].join(':');
 
-if(indexes[indexesKey]===undefined)
-indexes[indexesKey]=0;
+letindex=indexes.get(indexesKey);
+
+if(index===undefined)
+index=0;
 else
-indexes[indexesKey]++;
+index++;
+
+indexes.set(indexesKey,index);
 
 constmessage=util._extend({
 act: 'queryServer',
-index: indexes[indexesKey],
+ index,
 data: null
 },options);
 
@@ -108,7 +112,7 @@ function shared(message, handle, indexesKey, cb){
 handle.close=function(){
 send({act: 'close', key });
 deletehandles[key];
-deleteindexes[indexesKey];
+indexes.delete(indexesKey);
 returnclose.apply(this,arguments);
 }.bind(handle);
 assert(handles[key]===undefined);
@@ -141,7 +145,7 @@ function rr(message, indexesKey, cb){
 
 send({act: 'close', key });
 deletehandles[key];
-deleteindexes[indexesKey];
+indexes.delete(indexesKey);
 key=undefined;
 }