How to use the thrift.Thrift.objectLength function in thrift

output.writeFieldBegin('keysOnly', Thrift.Type.SET, 1);
    output.writeSetBegin(Thrift.Type.STRING, this.keysOnly.length);
    for (var iter31 in this.keysOnly)
    {
      if (this.keysOnly.hasOwnProperty(iter31))
      {
        iter31 = this.keysOnly[iter31];
        output.writeString(iter31);
      }
    }
    output.writeSetEnd();
    output.writeFieldEnd();
  }
  if (this.fullMap !== null && this.fullMap !== undefined) {
    output.writeFieldBegin('fullMap', Thrift.Type.MAP, 2);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.fullMap));
    for (var kiter32 in this.fullMap)
    {
      if (this.fullMap.hasOwnProperty(kiter32))
      {
        var viter33 = this.fullMap[kiter32];
        output.writeString(kiter32);
        output.writeString(viter33);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  output.writeFieldStop();
  output.writeStructEnd();
  return;
};

output.writeFieldBegin('columns', Thrift.Type.LIST, 2);
    output.writeListBegin(Thrift.Type.STRUCT, this.columns.length);
    for (var iter103 in this.columns)
    {
      if (this.columns.hasOwnProperty(iter103))
      {
        iter103 = this.columns[iter103];
        iter103.write(output);
      }
    }
    output.writeListEnd();
    output.writeFieldEnd();
  }
  if (this.attributes !== null && this.attributes !== undefined) {
    output.writeFieldBegin('attributes', Thrift.Type.MAP, 3);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.attributes));
    for (var kiter104 in this.attributes)
    {
      if (this.attributes.hasOwnProperty(kiter104))
      {
        var viter105 = this.attributes[kiter104];
        output.writeString(kiter104);
        output.writeString(viter105);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.durability !== null && this.durability !== undefined) {
    output.writeFieldBegin('durability', Thrift.Type.I32, 4);
    output.writeI32(this.durability);
    output.writeFieldEnd();

CqlMetadata.prototype.write = function(output) {
  output.writeStructBegin('CqlMetadata');
  if (this.name_types) {
    output.writeFieldBegin('name_types', Thrift.Type.MAP, 1);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.name_types));
    for (var kiter162 in this.name_types)
    {
      if (this.name_types.hasOwnProperty(kiter162))
      {
        var viter163 = this.name_types[kiter162];
        output.writeString(kiter162);
        output.writeString(viter163);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.value_types) {
    output.writeFieldBegin('value_types', Thrift.Type.MAP, 2);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.value_types));
    for (var kiter164 in this.value_types)

{
          if (viter32.hasOwnProperty(iter33))
          {
            iter33 = viter32[iter33];
            iter33.write(output);
          }
        }
        output.writeListEnd();
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.latest) {
    output.writeFieldBegin('latest', Thrift.Type.MAP, 2);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.DOUBLE, Thrift.objectLength(this.latest));
    for (var kiter34 in this.latest)
    {
      if (this.latest.hasOwnProperty(kiter34))
      {
        var viter35 = this.latest[kiter34];
        output.writeString(kiter34);
        output.writeDouble(viter35);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  output.writeFieldStop();
  output.writeStructEnd();
  return;
};

output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.name_types));
    for (var kiter188 in this.name_types)
    {
      if (this.name_types.hasOwnProperty(kiter188))
      {
        var viter189 = this.name_types[kiter188];
        output.writeString(kiter188);
        output.writeString(viter189);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.value_types !== null && this.value_types !== undefined) {
    output.writeFieldBegin('value_types', Thrift.Type.MAP, 2);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.value_types));
    for (var kiter190 in this.value_types)
    {
      if (this.value_types.hasOwnProperty(kiter190))
      {
        var viter191 = this.value_types[kiter190];
        output.writeString(kiter190);
        output.writeString(viter191);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.default_name_type !== null && this.default_name_type !== undefined) {
    output.writeFieldBegin('default_name_type', Thrift.Type.STRING, 3);
    output.writeString(this.default_name_type);
    output.writeFieldEnd();

output.writeString(this.contentClass);
    output.writeFieldEnd();
  }
  if (this.applicationData !== null && this.applicationData !== undefined) {
    output.writeFieldBegin('applicationData', Thrift.Type.STRUCT, 23);
    this.applicationData.write(output);
    output.writeFieldEnd();
  }
  if (this.lastEditedBy !== null && this.lastEditedBy !== undefined) {
    output.writeFieldBegin('lastEditedBy', Thrift.Type.STRING, 24);
    output.writeString(this.lastEditedBy);
    output.writeFieldEnd();
  }
  if (this.classifications !== null && this.classifications !== undefined) {
    output.writeFieldBegin('classifications', Thrift.Type.MAP, 26);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.classifications));
    for (var kiter42 in this.classifications)
    {
      if (this.classifications.hasOwnProperty(kiter42))
      {
        var viter43 = this.classifications[kiter42];
        output.writeString(kiter42);
        output.writeString(viter43);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  output.writeFieldStop();
  output.writeStructEnd();
  return;
};

output.writeString(this.key_validation_class);
    output.writeFieldEnd();
  }
  if (this.key_alias !== null && this.key_alias !== undefined) {
    output.writeFieldBegin('key_alias', Thrift.Type.STRING, 28);
    output.writeString(this.key_alias);
    output.writeFieldEnd();
  }
  if (this.compaction_strategy !== null && this.compaction_strategy !== undefined) {
    output.writeFieldBegin('compaction_strategy', Thrift.Type.STRING, 29);
    output.writeString(this.compaction_strategy);
    output.writeFieldEnd();
  }
  if (this.compaction_strategy_options !== null && this.compaction_strategy_options !== undefined) {
    output.writeFieldBegin('compaction_strategy_options', Thrift.Type.MAP, 30);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.compaction_strategy_options));
    for (var kiter141 in this.compaction_strategy_options)
    {
      if (this.compaction_strategy_options.hasOwnProperty(kiter141))
      {
        var viter142 = this.compaction_strategy_options[kiter141];
        output.writeString(kiter141);
        output.writeString(viter142);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.compression_options !== null && this.compression_options !== undefined) {
    output.writeFieldBegin('compression_options', Thrift.Type.MAP, 32);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.compression_options));
    for (var kiter143 in this.compression_options)

KsDef.prototype.write = function(output) {
  output.writeStructBegin('KsDef');
  if (this.name) {
    output.writeFieldBegin('name', Thrift.Type.STRING, 1);
    output.writeString(this.name);
    output.writeFieldEnd();
  }
  if (this.strategy_class) {
    output.writeFieldBegin('strategy_class', Thrift.Type.STRING, 2);
    output.writeString(this.strategy_class);
    output.writeFieldEnd();
  }
  if (this.strategy_options) {
    output.writeFieldBegin('strategy_options', Thrift.Type.MAP, 3);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.strategy_options));
    for (var kiter135 in this.strategy_options)
    {
      if (this.strategy_options.hasOwnProperty(kiter135))
      {
        var viter136 = this.strategy_options[kiter135];
        output.writeString(kiter135);
        output.writeString(viter136);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.replication_factor) {
    output.writeFieldBegin('replication_factor', Thrift.Type.I32, 4);
    output.writeI32(this.replication_factor);
    output.writeFieldEnd();

FlowDescriptor.prototype.write = function(output) {
  output.writeStructBegin('FlowDescriptor');
  if (this.identifier !== null && this.identifier !== undefined) {
    output.writeFieldBegin('identifier', Thrift.Type.STRUCT, 1);
    this.identifier.write(output);
    output.writeFieldEnd();
  }
  if (this.arguments !== null && this.arguments !== undefined) {
    output.writeFieldBegin('arguments', Thrift.Type.MAP, 2);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.arguments));
    for (var kiter16 in this.arguments)
    {
      if (this.arguments.hasOwnProperty(kiter16))
      {
        var viter17 = this.arguments[kiter16];
        output.writeString(kiter16);
        output.writeString(viter17);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  output.writeFieldStop();
  output.writeStructEnd();
  return;
};

output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.compaction_strategy_options));
    for (var kiter116 in this.compaction_strategy_options)
    {
      if (this.compaction_strategy_options.hasOwnProperty(kiter116))
      {
        var viter117 = this.compaction_strategy_options[kiter116];
        output.writeString(kiter116);
        output.writeString(viter117);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.compression_options) {
    output.writeFieldBegin('compression_options', Thrift.Type.MAP, 32);
    output.writeMapBegin(Thrift.Type.STRING, Thrift.Type.STRING, Thrift.objectLength(this.compression_options));
    for (var kiter118 in this.compression_options)
    {
      if (this.compression_options.hasOwnProperty(kiter118))
      {
        var viter119 = this.compression_options[kiter118];
        output.writeString(kiter118);
        output.writeString(viter119);
      }
    }
    output.writeMapEnd();
    output.writeFieldEnd();
  }
  if (this.bloom_filter_fp_chance) {
    output.writeFieldBegin('bloom_filter_fp_chance', Thrift.Type.DOUBLE, 33);
    output.writeDouble(this.bloom_filter_fp_chance);
    output.writeFieldEnd();