You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wordcap.go
    path of file: ./repos/beam/sdks/go/examples/timer_wordcap
    
    the code of the file until where you have to start completion: // Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License.  You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// timer_wordcap is a toy streaming pipeline that demonstrates the use of State and Timers.
// Periodic Impulse is used as a streaming source that produces sequence of elements upto 5 minutes
// from the start of the pipeline every 5 seconds. These elements are keyed and fed to the Stateful DoFn
// where state and timers are set and cleared. Since this pipeline uses a Periodic Impulse,
// the pipeline is terminated automatically after it is done producing elements for 5 minutes.
package main

import (
	"contex
    
func (s *Stateful) OnTimer(ctx context.Context, ts beam.EventTime, sp state.Provider, tp timers.Provider, key string, timer timers.Context, emit func(beam.EventTime, string, string)) {
	log.Infof(ctx, "Timer fired for key %q, for family %q and tag %q", key, timer.Family, timer.Tag)

	const tag = "emit" // Tags can be arbitrary strings, but we're associating behavior with this tag in this method.

	// Check which timer has fired.
	switch timer.Family {
	case s.OutputState.Family:
		switch timer.Tag {
		case "":
			// Timers can be set within the OnTimer method.
			// In this case the emit tag timer to fire in 5 seconds.
			s.OutputState.Set(tp, ts.ToTime().Add(5*time.Second), timers.WithTag(tag))
		case tag:
			// When the emit tag fires, read the batched data.
			es, ok, err := s.ElementBag.Read(sp)
			if err != nil {
				log.Errorf(ctx, "error reading ElementBag: %v", err)
				return
			}
			if !ok {
				log.Infof(ctx, "No elements in bag.")
				return
			}
			minTime, _, err := s.MinTime.Read(sp)
			if err != nil {
				log.Errorf(ctx, "error reading ElementBag: %v", err)
				return
			}
			log.Infof(ctx, "Emitting %d elements", len(es))
			for _, word := range es {
				emit(beam.EventTime(minTime), key, word)
			}
			// Clean up the state that has been evicted.
			s.ElementBag.Clear(sp)
			s.MinTime.Clear(sp)
		}
	}
}