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Source file src/sync/example_pool_test.go

Documentation: sync

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package sync_test
  
  import (
  	"bytes"
  	"io"
  	"os"
  	"sync"
  	"time"
  )
  
  var bufPool = sync.Pool{
  	New: func() interface{} {
  		// The Pool's New function should generally only return pointer
  		// types, since a pointer can be put into the return interface
  		// value without an allocation:
  		return new(bytes.Buffer)
  	},
  }
  
  // timeNow is a fake version of time.Now for tests.
  func timeNow() time.Time {
  	return time.Unix(1136214245, 0)
  }
  
  func Log(w io.Writer, key, val string) {
  	b := bufPool.Get().(*bytes.Buffer)
  	b.Reset()
  	// Replace this with time.Now() in a real logger.
  	b.WriteString(timeNow().UTC().Format(time.RFC3339))
  	b.WriteByte(' ')
  	b.WriteString(key)
  	b.WriteByte('=')
  	b.WriteString(val)
  	w.Write(b.Bytes())
  	bufPool.Put(b)
  }
  
  func ExamplePool() {
  	Log(os.Stdout, "path", "/search?q=flowers")
  	// Output: 2006-01-02T15:04:05Z path=/search?q=flowers
  }
  

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