Initial

resources/app/node_modules/nedb/test_lac/openFds.test.js

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+var fs = require('fs')
+  , child_process = require('child_process')
+  , async = require('async')
+  , Nedb = require('../lib/datastore')
+  , db = new Nedb({ filename: './workspace/openfds.db', autoload: true })
+  , N = 64   // Half the allowed file descriptors
+  , i, fds
+  ;
+
+function multipleOpen (filename, N, callback) {
+  async.whilst( function () { return i < N; }
+              , function (cb) {
+                fs.open(filename, 'r', function (err, fd) {
+                  i += 1;
+                  if (fd) { fds.push(fd); }
+                  return cb(err);
+                });
+              }
+              , callback);
+}
+
+async.waterfall([
+  // Check that ulimit has been set to the correct value
+  function (cb) {
+    i = 0;
+    fds = [];
+    multipleOpen('./test_lac/openFdsTestFile', 2 * N + 1, function (err) {
+      if (!err) { console.log("No error occured while opening a file too many times"); }
+      fds.forEach(function (fd) { fs.closeSync(fd); });
+      return cb();
+    })
+  }
+, function (cb) {
+    i = 0;
+    fds = [];
+    multipleOpen('./test_lac/openFdsTestFile2', N, function (err) {
+      if (err) { console.log('An unexpected error occured when opening file not too many times: ' + err); }
+      fds.forEach(function (fd) { fs.closeSync(fd); });
+      return cb();
+    })
+  }
+  // Then actually test NeDB persistence
+, function () {
+    db.remove({}, { multi: true }, function (err) {
+      if (err) { console.log(err); }
+      db.insert({ hello: 'world' }, function (err) {
+        if (err) { console.log(err); }
+
+        i = 0;
+        async.whilst( function () { return i < 2 * N  + 1; }
+                    , function (cb) {
+                        db.persistence.persistCachedDatabase(function (err) {
+                          if (err) { return cb(err); }
+                          i += 1;
+                          return cb();
+                        });
+                      }
+                    , function (err) {
+                      if (err) { console.log("Got unexpected error during one peresistence operation: " + err); }
+                      }
+                    );
+
+      });
+    });
+  }
+]);
+