Class: FastExists::MultiTenant::RecommendationEngine

Inherits:
Object
  • Object
show all
Defined in:
lib/fast_exists/multi_tenant/recommendation_engine.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tenant_records = {}) ⇒ RecommendationEngine

Returns a new instance of RecommendationEngine.



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# File 'lib/fast_exists/multi_tenant/recommendation_engine.rb', line 10

def initialize(tenant_records = {})
  @tenant_records = tenant_records
end

Class Method Details

.analyze(tenant_records = {}) ⇒ Object 



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# File 'lib/fast_exists/multi_tenant/recommendation_engine.rb', line 6

def self.analyze(tenant_records = {})
  new(tenant_records).generate_recommendations
end

Instance Method Details

#generate_recommendations ⇒ Object 



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# File 'lib/fast_exists/multi_tenant/recommendation_engine.rb', line 14

def generate_recommendations
  total_tenants = @tenant_records.size

  counts = { tiny: 0, small: 0, medium: 0, large: 0 }
  promotions = []
  demotions = []

  adaptive_strategy = FastExists::MultiTenant::Strategies::AdaptiveStrategy.new

  @tenant_records.each do |tenant_id, record_count|
    cat = adaptive_strategy.classify_tenant(tenant_id, record_count)
    counts[cat] += 1

    # Promotion check (e.g. record count grew past bucket limit)
    if cat == :large
      promotions << {
        tenant_id: tenant_id,
        current_category: :medium,
        recommended_category: :large,
        reason: "Tenant record count (#{record_count}) exceeded 1,000,000 threshold. Recommend dedicated Bloom filter."
      }
    end
  end

  current_strategy = FastExists.configuration.tenant_strategy

  # Calculate estimated Redis key reduction
  per_tenant_keys = [total_tenants, 1].max
  adaptive_keys = 3 + counts[:large] # tiny, small, medium pools + dedicated large filters

  key_reduction_pct = per_tenant_keys > 0 ? (((per_tenant_keys - adaptive_keys).to_f / per_tenant_keys) * 100).round(1) : 0.0
  memory_savings_pct = current_strategy == :per_tenant ? 78.0 : 0.0

  recommended_strategy = (counts[:tiny] + counts[:small] > 0.7 * [total_tenants, 1].max) ? :adaptive : current_strategy

  {
    total_tenants: total_tenants,
    buckets: counts,
    current_strategy: current_strategy,
    recommended_strategy: recommended_strategy,
    estimated_memory_savings_pct: [memory_savings_pct, 0.0].max,
    estimated_redis_keys: adaptive_keys,
    redis_key_reduction_pct: [key_reduction_pct, 0.0].max,
    promotions: promotions,
    demotions: demotions,
    advice: generate_advice(current_strategy, recommended_strategy, total_tenants, adaptive_keys, key_reduction_pct)
  }
end