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// Copyright (c) 2017 Couchbase, Inc.
//
// Licensed 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.
package ghistogram
import (
"errors"
"io"
"strings"
)
// Histograms represents a map of histograms identified by
// unique names (string).
type Histograms map[string]*Histogram
// API that converts the contents of all histograms within
// the map into a string and returns the string to caller.
func (hmap Histograms) String() string {
var output []string
for _, v := range hmap {
output = append(output, v.EmitGraph(nil, nil).String())
}
return strings.Join(output, "\n")
}
// Emits the ASCII graphs of all histograms held within
// the map through the provided writer.
func (hmap Histograms) Fprint(w io.Writer) (int, error) {
wrote, err := w.Write([]byte(hmap.String()))
return wrote, err
}
// Adds all entries/records from all histograms within the
// given map, to all histograms in the current map.
// If a histogram from the source doesn't exist in the
// destination map, it will be created first.
func (hmap Histograms) AddAll(srcmap Histograms) error {
for k, v := range srcmap {
if hmap[k] == nil {
// Histogram entry not found, create a new one, based
// on the same creation parameters
hmap[k] = v.CloneEmpty()
} else if (len(hmap[k].Counts) != len(v.Counts)) ||
(len(hmap[k].Ranges) != len(v.Ranges)) {
return errors.New("Mismatch in histogram creation parameters")
} else {
for i := 0; i < len(v.Ranges); i++ {
if hmap[k].Ranges[i] != v.Ranges[i] {
return errors.New("Mismatch in histogram creation parmeters")
}
}
}
}
for k, v := range srcmap {
hmap[k].AddAll(v)
}
return nil
}
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