code: function Cache(opts) {
      assert.object(opts, 'options');
      // assert.number(opts.dirty, 'options.dirty');
      assert.object(opts.log, 'options.log');
      assert.string(opts.location, 'options.location');
      assert.number(opts.size, 'options.size');
      assert.number(opts.ttl, 'options.ttl');
      assert.number(opts.wbtime, 'options.wbtime');
      assert.number(opts.num_par, 'options.num_par');
  
      events.EventEmitter.call(this, opts);
  
      // no maxAge means entries never age out on their own
      this.cache = LRU({
          max: Infinity // hacky - but we just want LRU bookeeping
      });
  
      this.current_size = 0;
      this.db = null;
      this.log = opts.log.child({
          component: 'MantaFsCache',
          location: path.normalize(opts.location)
      }, true);
      this.location = path.normalize(opts.location);
      this.max_size = opts.size;
      this.curr_size = 0;
      this.ttl_ms = opts.ttl * 1000;
      this.wbtime = opts.wbtime;
      this.num_par = opts.num_par;
      this.manta = opts.manta;
  
      this._mantafs_cache = true; // MDB flag
  
      // When we first startup we'll process any dirty files that might be left
      // in our cache during the open() function.
      this.open();
  }
docs: /--- API