Module: NewRelic::Agent::StatsEngine::Transactions

Included in:
NewRelic::Agent::StatsEngine
Defined in:
lib/new_relic/agent/stats_engine/transactions.rb

Overview

Handles pushing and popping elements onto an internal stack that tracks where time should be allocated in Transaction Traces

Defined Under Namespace

Modules: Shim

Instance Method Summary collapse

Instance Method Details

#end_transaction ⇒ Object

Try to clean up gracefully, otherwise we leave things hanging around on thread locals. If it looks like a transaction is still in progress, then maybe this is an inner transaction and is ignored.



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 95

def end_transaction
  stack = scope_stack

  if stack && stack.empty?
    NewRelic::Agent::TransactionState.get.clear_stats_scope_stack
  end
end

#pop_scope(expected_scope, name, time = Time.now.to_f) ⇒ Object

Pops a scope off the transaction stack - this updates the transaction sampler that we’ve finished execution of a traced method expected_scope should be the ScopeStackElement that was returned by the corresponding push_scope call. name is the name that will be applied to the generated transaction trace segment.



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 56

def pop_scope(expected_scope, name, time=Time.now.to_f)
  stack = scope_stack
  scope = stack.pop
  fail "unbalanced pop from blame stack, got #{scope ? scope.tag : 'nil'}, expected #{expected_scope ? expected_scope.tag : 'nil'}" if scope != expected_scope

  if !stack.empty?
    if scope.deduct_call_time_from_parent
      stack.last.children_time += (time - scope.start_time)
    else
      stack.last.children_time += scope.children_time
    end
  end
  transaction_sampler.notice_pop_scope(name, time) if sampler_enabled?
  scope.name = name
  scope
end

#push_scope(tag, time = Time.now.to_f, deduct_call_time_from_parent = true) ⇒ Object

Pushes a scope onto the transaction stack - this generates a TransactionSample::Segment at the end of transaction execution The generated segment will not be named until the corresponding pop_scope call is made. tag should be a Symbol, and is only used for debugging purposes to identify this scope if the stack gets corrupted.



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 42

def push_scope(tag, time = Time.now.to_f, deduct_call_time_from_parent = true)
  stack = scope_stack
  transaction_sampler.notice_push_scope(time) if sampler_enabled?
  scope = ScopeStackElement.new(tag, time, deduct_call_time_from_parent)
  stack.push scope
  scope
end

#sampler_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 73

def sampler_enabled?
  Agent.config[:'transaction_tracer.enabled'] || Agent.config[:developer_mode]
end

#scope_stack ⇒ Object

Returns the current scope stack, memoized to a thread local variable



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 108

def scope_stack
  NewRelic::Agent::TransactionState.get.stats_scope_stack
end

#start_transaction ⇒ Object

Start a new transaction, unless one is already in progress



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 87

def start_transaction
  NewRelic::Agent.instance.events.notify(:start_transaction)
end

#transaction_sampler ⇒ Object 



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 77

def transaction_sampler
  Agent.instance.transaction_sampler
end

#transaction_sampler=(sampler) ⇒ Object

deprecated–used to add transaction sampler, now we always look to the agent



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 82

def transaction_sampler= sampler
  NewRelic::Agent.logger.warn("NewRelic::Agent::StatsEngine#transaction_sampler is deprecated")
end

#transaction_stats_hash ⇒ Object 



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# File 'lib/new_relic/agent/stats_engine/transactions.rb', line 103

def transaction_stats_hash
  Transaction.current && Transaction.current.stats_hash
end