Remove memory cache, file watcher.

lib/mbtiles.js

@@ -27,8 +27,6 @@ function hash(z, x, y) {
 module.exports = MBTiles;
 MBTiles.utils = require('./utils');
 
-var cache = {};
-
 // Provides access to an mbtiles database file.
 // - uri: A parsed URL hash, the only relevant part is `pathname`.
 // - callback: Will be called when the resources have been acquired
@@ -51,61 +49,23 @@ function MBTiles(uri, callback) {
     uri.query = uri.query || {};
     if (!uri.query.batch) uri.query.batch = 100;
 
-    var key = url.format(uri);
-    if (!cache[key]) {
-        this.setMaxListeners(0);
-        cache[key] = this;
-        this._open(uri);
-    }
-
-    var mbtiles = cache[key];
-    if (!mbtiles.open && !mbtiles.error) {
-        mbtiles.once('open', function(err, mbtiles) {
-            if (err) delete cache[key];
-            callback(err, mbtiles);
-        });
-    } else {
-        callback(mbtiles.error || null, mbtiles);
-    }
-    return undefined;
-}
-
-MBTiles.prototype._open = function(uri) {
     var mbtiles = this;
-    function error(err) {
-        process.nextTick(function() {
-            mbtiles.error = err;
-            mbtiles.emit('open', err);
-        });
-    }
-
-    var key = url.format(uri);
+    this.setMaxListeners(0);
     this.filename = uri.pathname;
     this._batchSize = +uri.query.batch;
     Step(function() {
         mbtiles._db = new sqlite3.Database(mbtiles.filename, this);
     }, function(err) {
-        if (err) return error(err);
+        if (err) throw err;
         mbtiles._setup(this);
     }, function(err) {
-        if (err) return error(err);
+        if (err) throw err;
         fs.stat(mbtiles.filename, this);
     }, function(err, stat) {
-        if (err) return error(err);
+        if (err) return callback(err);
         mbtiles._stat = stat;
-        fs.watchFile(mbtiles.filename, {
-            // Indicates that the node process may exit if the file watcher
-            // is the only thing in the event loop.
-            persistent: false,
-            interval: 1000
-        }, function(cur, prev) {
-            if (cur.mtime != prev.mtime) {
-                fs.unwatchFile(mbtiles.filename);
-                delete cache[key];
-            }
-        });
         mbtiles.open = true;
-        mbtiles.emit('open', null, mbtiles);
+        callback(null, mbtiles);
     });
 
     return undefined;
@@ -161,10 +121,6 @@ MBTiles.prototype._exists = function(table, callback) {
     }
 };
 
-MBTiles.prototype._close = function() {
-    fs.unwatchFile(this.filename);
-};
-
 // DB integrity check.
 //
 // - @param {Function(err)} callback