Class: HeapScope::TrendStore

Inherits:
Object
  • Object
show all
Defined in:
lib/heapscope/trend_store.rb

Overview

Persists monitor samples for historical trend reports.

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ TrendStore

Returns a new instance of TrendStore.



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# File 'lib/heapscope/trend_store.rb', line 8

def initialize(path)
  @path = path
end

Instance Method Details

#append(sample_hash) ⇒ Object 



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# File 'lib/heapscope/trend_store.rb', line 12

def append(sample_hash)
  rows = load
  rows << sample_hash
  File.write(@path, JSON.pretty_generate(rows))
  rows.size
end

#load ⇒ Object 



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# File 'lib/heapscope/trend_store.rb', line 19

def load
  return [] unless File.exist?(@path)

  JSON.parse(File.read(@path), symbolize_names: true)
rescue StandardError
  []
end

#summary ⇒ Object 



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# File 'lib/heapscope/trend_store.rb', line 27

def summary
  rows = load
  return { samples: 0 } if rows.empty?

  rss = rows.map { |r| r[:rss_bytes].to_i }
  live = rows.map { |r| r[:live_slots].to_i }
  {
    samples: rows.size,
    rss: { first: rss.first, last: rss.last, delta: rss.last - rss.first, max: rss.max },
    live_slots: { first: live.first, last: live.last, delta: live.last - live.first, max: live.max },
    top_classes: rows.map { |r| r[:top_class] }.compact.tally.sort_by { |_, v| -v }.first(5)
  }
end