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Fluent::EventRouter

EventRouter is responsible to route events to a collector.

It has a list of MatchPattern and Collector pairs:

+----------------+     +-----------------+
|  MatchPattern  |     |    Collector    |
+----------------+     +-----------------+
|   access.**  ---------> type forward   |
|     logs.**  ---------> type copy      |
|  archive.**  ---------> type s3        |
+----------------+     +-----------------+

EventRouter does:

1) receive an event at `emit` methods 2) match the event's tag with the MatchPatterns 3) forward the event to the corresponding Collector

Collector is either of Output, Filter or other EventRouter.

Attributes

default_collector[RW]
emit_error_handler[RW]

Public Class Methods

new(default_collector, emit_error_handler) click to toggle source
# File lib/fluent/event_router.rb, line 41
def initialize(default_collector, emit_error_handler)
  @match_rules = []
  @match_cache = MatchCache.new
  @default_collector = default_collector
  @emit_error_handler = emit_error_handler
  @chain = NullOutputChain.instance
end

Public Instance Methods

add_rule(pattern, collector) click to toggle source

called by Agent to add new match pattern and collector

# File lib/fluent/event_router.rb, line 73
def add_rule(pattern, collector)
  @match_rules << Rule.new(pattern, collector)
end
emit(tag, time, record) click to toggle source
# File lib/fluent/event_router.rb, line 77
def emit(tag, time, record)
  unless record.nil?
    emit_stream(tag, OneEventStream.new(time, record))
  end
end
emit_array(tag, array) click to toggle source
# File lib/fluent/event_router.rb, line 83
def emit_array(tag, array)
  emit_stream(tag, ArrayEventStream.new(array))
end
emit_error_event(tag, time, record, error) click to toggle source
# File lib/fluent/event_router.rb, line 93
def emit_error_event(tag, time, record, error)
  @emit_error_handler.emit_error_event(tag, time, record, error)
end
emit_stream(tag, es) click to toggle source
# File lib/fluent/event_router.rb, line 87
def emit_stream(tag, es)
  match(tag).emit(tag, es, @chain)
rescue => e
  @emit_error_handler.handle_emits_error(tag, es, e)
end
match(tag) click to toggle source
# File lib/fluent/event_router.rb, line 101
def match(tag)
  collector = @match_cache.get(tag) {
    c = find(tag) || @default_collector
  }
  collector
end
match?(tag) click to toggle source
# File lib/fluent/event_router.rb, line 97
def match?(tag)
  !!find(tag)
end

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